From mx.cogito@gmail.com Mon Aug 18 01:46:17 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 96BAE6501C0 for ; Sun, 17 Aug 2008 22:46:17 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 80896-05 for ; Sun, 17 Aug 2008 22:46:04 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from ti-out-0910.google.com (ti-out-0910.google.com [209.85.142.184]) by postgresql.org (Postfix) with ESMTP id DD5436501A8 for ; Sun, 17 Aug 2008 22:46:08 -0300 (ADT) Received: by ti-out-0910.google.com with SMTP id y8so973851tia.5 for ; Sun, 17 Aug 2008 18:46:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:mime-version:content-type; bh=bUjgKWGlC+ioSefJgCrNeX5mSFZb8nE+G/GAibnlLFI=; b=lOXi3n4HOPuk+ZxDsiwpT82mIOYxURFWaiNc9WfQ44CtaTVXZVWaK6Rrx9EmQE7LR9 XOq5GmHFTQ5EMj1nx3KRDN0imwVEUpbh9anxqM5TABXsiDUdpmr4DwSMnjlD25cWn6u3 F/RRw9G7KPmQoy8J0txFKhIuAzj1em3JEWsS4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:mime-version:content-type; b=Nz6OGMnlQKkLZulIcH9ywbc1EYckIokD4neAzf7qhHr+m9BJxcx2G0SqUjYLQac0kF Lkdw3RVlFsB+WT05KFleEsvMJd1Y+Er/NTBF5n8d2kHagZsbW1EarIAZvodYStXiYDMh 1oFVlkbx7+xYJhDZiCdG8Wu/Fd8F+ZZmCv2pA= Received: by 10.110.47.17 with SMTP id u17mr1340042tiu.49.1219023966173; Sun, 17 Aug 2008 18:46:06 -0700 (PDT) Received: by 10.110.95.17 with HTTP; Sun, 17 Aug 2008 18:46:06 -0700 (PDT) Message-ID: Date: Mon, 18 Aug 2008 09:46:06 +0800 From: "Xiao Meng" To: pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: hash index improving v3 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_38647_21987634.1219023966172" X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0.001 tagged_above=0 required=5 tests=HTML_MESSAGE=0.001 X-Spam-Level: X-Archive-Number: 200808/14 X-Sequence-Number: 6990 ------=_Part_38647_21987634.1219023966172 Content-Type: multipart/alternative; boundary="----=_Part_38648_5438125.1219023966172" ------=_Part_38648_5438125.1219023966172 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline There's minor change against the previous one( http://archives.postgresql.org/pgsql-hackers/2008-07/msg01183.php ). * merge branch master(Aug 16) into the patch * clean code and make some comment Performance result is here http://wiki.postgresql.org/wiki/Gsoc08-hashindex It seems hash index is a little better on index creation and selection. But maybe it's in the range of noise, I'm not sure. I'd like to try it with a bigger dataset (e.g. table with 10GB) but there is not enough space in my computer. Anyone interest can make a test on a bigger data set. -- Best Regards, Xiao Meng DKERC, Harbin Institute of Technology, China Gtalk: mx.cogito@gmail.com MSN: cnEnder@live.com http://xiaomeng.yo2.cn ------=_Part_38648_5438125.1219023966172 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline
There's minor change against the previous one( http://archives.postgresql.org/pgsql-hackers/2008-07/msg01183.php ).
* merge branch master(Aug 16) into the patch
* clean code and make some comment
Performance result is here
http://wiki.postgresql.org/wiki/Gsoc08-hashindex

It seems hash index is a little better on index creation and selection.
But maybe  it's in the range of noise, I'm not sure.
I'd like to try it with a bigger dataset (e.g. table with 10GB) but there is not enough space in my computer.
Anyone interest can make a test on a bigger data set.

--
Best Regards,
Xiao Meng

DKERC, Harbin Institute of Technology, China
Gtalk: mx.cogito@gmail.com
MSN: cnEnder@live.com
http://xiaomeng.yo2.cn
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094FF64FD06 for ; Tue, 19 Aug 2008 06:28:45 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 79819-02 for ; Tue, 19 Aug 2008 06:28:38 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from ti-out-0910.google.com (ti-out-0910.google.com [209.85.142.184]) by postgresql.org (Postfix) with ESMTP id 98E9E64FCE6 for ; Tue, 19 Aug 2008 06:28:41 -0300 (ADT) Received: by ti-out-0910.google.com with SMTP id y8so1493092tia.5 for ; Tue, 19 Aug 2008 02:28:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:in-reply-to:mime-version:content-type:references; bh=turM55OHO6f1S4zlcqGHzbUoLy9xUuXCja4RshWHxds=; b=l/oM8KKWvRm6OU01P/E7+I703ArmFuavdEy9D76RkbZ0iGtO8GslJzGdNOH1nfz55p AiHdix0AgsHvsoZhjKOpDAp0QCJBck637oR95oJmTMr6LpkhMTXBemR0jgdzzRgRwPll 5AJB4yXsviv9levpM36oFlPyhzu0kURWIRNqA= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:in-reply-to:mime-version :content-type:references; b=G+E5ZdxZhEtshJvBL901yXWcioT3OH2xMtUuVaC8Tj/6+kiRnJZzoe/NbpHbd3b4D1 cG7gPjKK0Rs7Rgsozbzdw9lb9fbCT5ORo5RLBYCkyHwnWJFv5zTlwgFNrIt6j88siu25 PUHJdjjNkoQoe5JCuklpYUL6iQu2bg0Sn9kBw= Received: by 10.110.68.10 with SMTP id q10mr6914928tia.37.1219138118840; Tue, 19 Aug 2008 02:28:38 -0700 (PDT) Received: by 10.110.95.17 with HTTP; Tue, 19 Aug 2008 02:28:38 -0700 (PDT) Message-ID: Date: Tue, 19 Aug 2008 17:28:38 +0800 From: "Xiao Meng" To: pgsql-patches@postgresql.org Subject: Re: hash index improving v3 In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_83961_9475606.1219138118824" References: X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0.001 tagged_above=0 required=5 tests=HTML_MESSAGE=0.001 X-Spam-Level: X-Archive-Number: 200808/18 X-Sequence-Number: 6994 ------=_Part_83961_9475606.1219138118824 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline With the help of David Fetter, you can get the copy by git clone http://git.postgresql.org/git/~davidfetter/hash/.git It's in the branch gsoc-hash. Thank you, David. -- Best Regards, Xiao Meng DKERC, Harbin Institute of Technology, China Gtalk: mx.cogito@gmail.com MSN: cnEnder@live.com http://xiaomeng.yo2.cn ------=_Part_83961_9475606.1219138118824 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline
With the help of David Fetter, you can get the copy by
git clone http://git.postgresql.org/git/~davidfetter/hash/.git
It's in the branch gsoc-hash.
Thank you, David.

--
Best Regards,
Xiao Meng

DKERC, Harbin Institute of Technology, China
Gtalk: mx.cogito@gmail.com
MSN: cnEnder@live.com
http://xiaomeng.yo2.cn
------=_Part_83961_9475606.1219138118824-- From simon@2ndQuadrant.com Thu Sep 4 02:06:41 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 850AA64FD0D for ; Wed, 3 Sep 2008 23:06:41 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 15539-09 for ; Wed, 3 Sep 2008 23:06:38 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from outmail128092.authsmtp.net (outmail128092.authsmtp.net [62.13.128.92]) by postgresql.org (Postfix) with ESMTP id BBFC864FCF3 for ; Wed, 3 Sep 2008 23:06:38 -0300 (ADT) Received: from mail-c189.authsmtp.com (mail-c189.authsmtp.com [62.13.128.71]) by punt5.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id m8426X1U057979; Thu, 4 Sep 2008 03:06:33 +0100 (BST) Received: from [192.168.0.2] (85-211-229-97.dyn.gotadsl.co.uk [85.211.229.97]) (authenticated bits=0) by mail.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id m8426WSl026052; Thu, 4 Sep 2008 03:06:32 +0100 (BST) Subject: Re: hash index improving v3 From: Simon Riggs To: Xiao Meng Cc: pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: References: Content-Type: text/plain Date: Thu, 04 Sep 2008 03:06:42 +0100 Message-Id: <1220494002.4371.813.camel@ebony.2ndQuadrant> Mime-Version: 1.0 X-Mailer: Evolution 2.12.0 Content-Transfer-Encoding: 7bit X-Server-Quench: 188b888e-7a26-11dd-bc7a-001f29070be2 X-AuthRoute: OCdxZQATClZOTQEd DAteCiNZVAwpPBRK HVkIKg5MJUcNSQVJ NksadRtFaAFbflxB HGQLW1xEUF97WWV/ aAkfZQBDYEtPQQdo WVZARU1QEQdtHhxP WxYaUB8VFFlGenhw YEQsX3VeXgp7fU4v SkZcQHABNGVmdWEe BBRFJVBTIR5Kfh4T aFl/U3NfNGdJBC9q VzwLFgwaHRhkHWxV SxoNZVMUTUsbVj85 XwoFAzQpEgUbHE0g X-Authentic-SMTP: 61633235383639.kestrel.dmpriest.net.uk:1186/Kp X-Report-SPAM: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-Virus-Status: No virus detected - but ensure you scan with your own anti-virus system! X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/35 X-Sequence-Number: 7050 On Mon, 2008-08-18 at 09:46 +0800, Xiao Meng wrote: > There's minor change against the previous > one( http://archives.postgresql.org/pgsql-hackers/2008-07/msg01183.php ). > * merge branch master(Aug 16) into the patch > * clean code and make some comment > Performance result is here > http://wiki.postgresql.org/wiki/Gsoc08-hashindex > > It seems hash index is a little better on index creation and > selection. > But maybe it's in the range of noise, I'm not sure. > I'd like to try it with a bigger dataset (e.g. table with 10GB) but > there is not enough space in my computer. > Anyone interest can make a test on a bigger data set. You don't give the text of the query used to do these performance tests, so I can't validate your test results. Right now it seems strange that the index is larger than a btree, yet the performance tests show that 3 times as much I/O was used accessing the btree. -- Simon Riggs www.2ndQuadrant.com PostgreSQL Training, Services and Support From jonah.harris@gmail.com Thu Sep 4 04:10:23 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 9D2AD64FCEB for ; Thu, 4 Sep 2008 01:10:23 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 43342-03 for ; Thu, 4 Sep 2008 01:10:17 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from wf-out-1314.google.com (wf-out-1314.google.com [209.85.200.171]) by postgresql.org (Postfix) with ESMTP id A766164FCD8 for ; Thu, 4 Sep 2008 01:10:07 -0300 (ADT) Received: by wf-out-1314.google.com with SMTP id 25so3179173wfc.28 for ; Wed, 03 Sep 2008 21:10:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=hjx0kb8n7korj+BxP8hOHCyZZnO6CrTewQDVnPcTHHw=; b=TOjTJimhcGYB2W2GV+L7eM4btgbPA58x/7/HToimZF8yHnSixdGn7Kc/9tvB6flY2o ukl7/w6Nvjkk85frMLed+X9PnXKXqXIujk2sUWWzwpbKz6y48a869+a/lXdMXCWP4k3U abGdR4ZO5049dk57nbUAElGWVRZXgBOPSjDFo= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=VOxZVclzRMqq+sjovPG2tDj/+AdK7mNXc7xVVGRjlmhh7a97zpv3tp8LIHzfwR2qbr Gk2EcnL9QdD7uNruzb3ih8VW8bP5iw2FGULZqT6T1iedCjXe7Ct8uKnfXFWRbB1xgkP2 HcqB9b5SbuOhEkQpLkhTaXFkQvZNasJ1Ate5Y= Received: by 10.142.218.4 with SMTP id q4mr3354258wfg.262.1220501406569; Wed, 03 Sep 2008 21:10:06 -0700 (PDT) Received: by 10.142.86.13 with HTTP; Wed, 3 Sep 2008 21:10:06 -0700 (PDT) Message-ID: <36e682920809032110h41462f7ct6a0ac5716c5a9d64@mail.gmail.com> Date: Thu, 4 Sep 2008 00:10:06 -0400 From: "Jonah H. Harris" To: "Simon Riggs" Subject: Re: hash index improving v3 Cc: "Xiao Meng" , pgsql-patches@postgresql.org In-Reply-To: <1220494002.4371.813.camel@ebony.2ndQuadrant> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <1220494002.4371.813.camel@ebony.2ndQuadrant> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/36 X-Sequence-Number: 7051 On Wed, Sep 3, 2008 at 10:06 PM, Simon Riggs wrote: >> It seems hash index is a little better on index creation and >> selection. >> But maybe it's in the range of noise, I'm not sure. >> I'd like to try it with a bigger dataset (e.g. table with 10GB) but >> there is not enough space in my computer. >> Anyone interest can make a test on a bigger data set. I tried it earlier on a 500M row table and found a few bugs. In particular, it doesn't seem like recheck is happening and the performance/sizing is a bit *interesting*. I'll post stats tomorrow when I'm in the office. -- Jonah H. Harris, Senior DBA myYearbook.com From tgl@sss.pgh.pa.us Thu Sep 4 05:35:29 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 52BBB64FCE8 for ; Thu, 4 Sep 2008 02:35:29 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 87147-02 for ; Thu, 4 Sep 2008 02:35:23 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 5B84864FCD8 for ; Thu, 4 Sep 2008 02:35:23 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m845ZGam014103; Thu, 4 Sep 2008 01:35:16 -0400 (EDT) To: Simon Riggs cc: Xiao Meng , pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: Re: hash index improving v3 In-reply-to: <1220494002.4371.813.camel@ebony.2ndQuadrant> References: <1220494002.4371.813.camel@ebony.2ndQuadrant> Comments: In-reply-to Simon Riggs message dated "Thu, 04 Sep 2008 03:06:42 +0100" Date: Thu, 04 Sep 2008 01:35:16 -0400 Message-ID: <14102.1220506516@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/37 X-Sequence-Number: 7052 Simon Riggs writes: > Right now it seems strange that the index is larger than a btree, yet > the performance tests show that 3 times as much I/O was used accessing > the btree. Well, in an ideal world a hash index probe is O(1) while a btree probe is O(log N), so that result is exactly what hash proponents would hope for. Whether it's real or not is another question, but it could be. regards, tom lane From Zdenek.Kotala@Sun.COM Thu Sep 4 12:54:10 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 526A164FCD8 for ; Thu, 4 Sep 2008 09:54:10 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 54617-02 for ; Thu, 4 Sep 2008 09:54:07 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from gmp-eb-inf-2.sun.com (gmp-eb-inf-2.sun.com [192.18.6.24]) by postgresql.org (Postfix) with ESMTP id 3F20A64FCEB for ; Thu, 4 Sep 2008 09:54:06 -0300 (ADT) Received: from fe-emea-09.sun.com (gmp-eb-lb-2-fe3.eu.sun.com [192.18.6.12]) by gmp-eb-inf-2.sun.com (8.13.7+Sun/8.12.9) with ESMTP id m84Crs2O022488 for ; Thu, 4 Sep 2008 12:54:04 GMT Received: from conversion-daemon.fe-emea-09.sun.com by fe-emea-09.sun.com (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) id <0K6O005018148C00@fe-emea-09.sun.com> (original mail from Zdenek.Kotala@Sun.COM) for pgsql-patches@postgresql.org; Thu, 04 Sep 2008 13:53:54 +0100 (BST) Received: from [129.157.18.76] by fe-emea-09.sun.com (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) with ESMTPSA id <0K6O009T795QS5F0@fe-emea-09.sun.com>; Thu, 04 Sep 2008 13:53:50 +0100 (BST) Date: Thu, 04 Sep 2008 14:54:37 +0200 From: Zdenek Kotala Subject: Re: hash index improving v3 In-reply-to: To: Xiao Meng Cc: pgsql-patches@postgresql.org, "Jonah H. Harris" Message-id: <48BFDA8D.3080506@sun.com> MIME-version: 1.0 Content-type: text/plain; format=flowed; charset=ISO-8859-2 Content-transfer-encoding: 7BIT References: User-Agent: Thunderbird 2.0.0.14 (X11/20080630) X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200809/38 X-Sequence-Number: 7053 I performed code review and see my comments. pgsql/src/backend/access/hash/hashpage.c use sizeof() or something better the 4. pgsql/src/backend/access/hash/hashpage.c New empty line. pgsql/src/backend/access/hash/hashutil.c It would be better remove #define from hash.h and setup it there directly. pgsql/src/backend/access/hash/hashutil.c Why not return directly uint32? pgsql/src/backend/access/hash/hashutil.c Retype to correct return type. pgsql/src/backend/access/hash/hashutil.c Whats about null values? pgsql/src/backend/access/hash/hashutil.c I'm not sure if values modification is safe. Please, recheck. pgsql/src/backend/access/hash/hashutil.c Return value is not much clear. I prefer to return InvalidOffset when no record is found. However it seems that you use result also for PageAddItem to put item on correct ordered position. I think better explanation should help to understand how it works. pgsql/src/backend/access/hash/hashutil.c It could return FirstOffset number in case when nothing interesting is on the page. pgsql/src/include/access/hash.h Why not define new datatype for example HashKey instead of uint32? pgsql/src/include/access/hash.h It is not good place. See my other comment. -------------- You also forgot to bump hash index version in meta page. Zdenek From mx.cogito@gmail.com Thu Sep 4 13:03:54 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id BF07064FCD8 for ; Thu, 4 Sep 2008 10:03:54 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 56811-07 for ; Thu, 4 Sep 2008 10:03:49 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from ti-out-0910.google.com (ti-out-0910.google.com [209.85.142.189]) by postgresql.org (Postfix) with ESMTP id E680464FCEF for ; Thu, 4 Sep 2008 10:03:48 -0300 (ADT) Received: by ti-out-0910.google.com with SMTP id y8so2092138tia.5 for ; Thu, 04 Sep 2008 06:03:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:in-reply-to:mime-version:content-type:references; bh=/pIdNu6a7DmtsFTFOfkKRYrvwEDsn10qmp7epHlNvJM=; b=MjJxy80SY75AyCBaHNyEd/UJYq9eXCWtb5xe5r86yl/SspNaDfFvBCp+R1TrS9o56k h3E+cEkd0o2V49FA//vVeDiNKDwHkTtQG8QGjJk6xZrivQ5MHrYdcFmrRFSe04aEM5Jx FMGyHC9UFb5eeiQ9WtBnll2p1N+7YseS6MVbc= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:in-reply-to:mime-version :content-type:references; b=qUkJwDrIvZYoTMq15y+jhjYDgD5XrNpcdJuXIUGnIl9AXC5gDo3L2p/GA7n80XBub4 WQ6KLwasIefOF0Tc1RgTq/qCKsHhYEFVKql1bClYqDiHBDMwaj3hHJNhvfN+DoNIT6Ku y5C9E5TdWp/zxQd/7AxjLY1SX/Fic0ti1Rik8= Received: by 10.110.31.5 with SMTP id e5mr13031557tie.1.1220533425343; Thu, 04 Sep 2008 06:03:45 -0700 (PDT) Received: by 10.110.8.14 with HTTP; Thu, 4 Sep 2008 06:03:45 -0700 (PDT) Message-ID: Date: Thu, 4 Sep 2008 21:03:45 +0800 From: "Xiao Meng" To: "Simon Riggs" , pgsql-hackers@postgresql.org Subject: Re: [PATCHES] hash index improving v3 In-Reply-To: <1220494002.4371.813.camel@ebony.2ndQuadrant> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_89024_24092264.1220533425341" References: <1220494002.4371.813.camel@ebony.2ndQuadrant> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0.001 tagged_above=0 required=5 tests=HTML_MESSAGE=0.001 X-Spam-Level: X-Archive-Number: 200809/247 X-Sequence-Number: 123376 ------=_Part_89024_24092264.1220533425341 Content-Type: multipart/alternative; boundary="----=_Part_89025_24270467.1220533425341" ------=_Part_89025_24270467.1220533425341 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline On Thu, Sep 4, 2008 at 10:06 AM, Simon Riggs wrote: > You don't give the text of the query used to do these performance tests, > so I can't validate your test results. > The attachment is the code to generate the text. Just $g++ my-permu-code.cpp $./a.out > /tmp/words -- Best Regards, Xiao Meng DKERC, Harbin Institute of Technology, China Gtalk: mx.cogito@gmail.com MSN: cnEnder@live.com http://xiaomeng.yo2.cn ------=_Part_89025_24270467.1220533425341 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline
On Thu, Sep 4, 2008 at 10:06 AM, Simon Riggs <simon@2ndquadrant.com> wrote:
You don't give the text of the query used to do these performance tests,
so I can't validate your test results.

The attachment is the code to generate the text.
Just
$g++ my-permu-code.cpp
$./a.out > /tmp/words

--
Best Regards,
Xiao Meng

DKERC, Harbin Institute of Technology, China
Gtalk: mx.cogito@gmail.com
MSN: cnEnder@live.com
http://xiaomeng.yo2.cn
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X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/265 X-Sequence-Number: 123394 On Thu, 2008-09-04 at 21:03 +0800, Xiao Meng wrote: > On Thu, Sep 4, 2008 at 10:06 AM, Simon Riggs > wrote: > You don't give the text of the query used to do these > performance tests, > > so I can't validate your test results. > > The attachment is the code to generate the text. > Just > $g++ my-permu-code.cpp > $./a.out > /tmp/words That generates the data, fine. What about the test query? You say you are running this command line pgbench -U postgres -n -f /tmp/query.sql dict Where is query.sql? It doesn't seem a big ask to be shown the SQL statement that is being executed, so we understand what is going on. -- Simon Riggs www.2ndQuadrant.com PostgreSQL Training, Services and Support From tgl@sss.pgh.pa.us Thu Sep 4 20:06:32 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 7999F64FD33 for ; Thu, 4 Sep 2008 17:06:32 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 30698-10 for ; Thu, 4 Sep 2008 17:06:28 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 951F264FCEF for ; Thu, 4 Sep 2008 17:06:28 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m84K6OUN029387; Thu, 4 Sep 2008 16:06:24 -0400 (EDT) To: Zdenek Kotala cc: Xiao Meng , pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: Re: hash index improving v3 In-reply-to: <48BFDA8D.3080506@sun.com> References: <48BFDA8D.3080506@sun.com> Comments: In-reply-to Zdenek Kotala message dated "Thu, 04 Sep 2008 14:54:37 +0200" Date: Thu, 04 Sep 2008 16:06:23 -0400 Message-ID: <29386.1220558783@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/39 X-Sequence-Number: 7054 Zdenek Kotala writes: > I performed code review and see my comments. Thanks for the comments. I've incorporated all of these into an updated patch that I'm preparing, except for > Why not define new datatype for example HashKey instead of uint32? This seems like a good idea, but I think we should do it as a separate, cosmetic-cleanup patch. It'll touch a lot of parts of access/hash/ that the current patch doesn't need to change, and thus complicate reviewing. regards, tom lane From tgl@sss.pgh.pa.us Thu Sep 4 20:28:47 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 3A1C064FCEF for ; Thu, 4 Sep 2008 17:28:47 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 35322-09 for ; Thu, 4 Sep 2008 17:28:40 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 63F7264FCEB for ; Thu, 4 Sep 2008 17:28:39 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m84KSY74029988; Thu, 4 Sep 2008 16:28:35 -0400 (EDT) To: Zdenek Kotala cc: Xiao Meng , pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: Re: hash index improving v3 In-reply-to: <48BFDA8D.3080506@sun.com> References: <48BFDA8D.3080506@sun.com> Comments: In-reply-to Zdenek Kotala message dated "Thu, 04 Sep 2008 14:54:37 +0200" Date: Thu, 04 Sep 2008 16:28:34 -0400 Message-ID: <29987.1220560114@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/40 X-Sequence-Number: 7055 Zdenek Kotala writes: > pgsql/src/backend/access/hash/hashutil.c > > It would be better remove #define from hash.h and setup it there > directly. Actually, I don't like this aspect of the patch one bit: it means that the system catalogs are lying about what is stored in the index, which seems likely to break something somewhere, either now or down the road. I think the correct way to handle this is to make the pg_attribute entries (and hence the index's relation descriptor) accurately match what is stored in the index. For testing purposes I propose this crude hack in catalog/index.c's ConstructTupleDescriptor(): *** src/backend/catalog/index.c.orig Mon Aug 25 18:42:32 2008 --- src/backend/catalog/index.c Thu Sep 4 16:20:12 2008 *************** *** 133,138 **** --- 133,139 ---- Form_pg_attribute to = indexTupDesc->attrs[i]; HeapTuple tuple; Form_pg_type typeTup; + Form_pg_opclass opclassTup; Oid keyType; if (atnum != 0) *************** *** 240,246 **** if (!HeapTupleIsValid(tuple)) elog(ERROR, "cache lookup failed for opclass %u", classObjectId[i]); ! keyType = ((Form_pg_opclass) GETSTRUCT(tuple))->opckeytype; ReleaseSysCache(tuple); if (OidIsValid(keyType) && keyType != to->atttypid) --- 241,252 ---- if (!HeapTupleIsValid(tuple)) elog(ERROR, "cache lookup failed for opclass %u", classObjectId[i]); ! opclassTup = (Form_pg_opclass) GETSTRUCT(tuple); ! /* HACK: make hash always use int4 as storage (really it's uint32) */ ! if (opclassTup->opcmethod == HASH_AM_OID) ! keyType = INT4OID; ! else ! keyType = opclassTup->opckeytype; ReleaseSysCache(tuple); if (OidIsValid(keyType) && keyType != to->atttypid) Assuming the patch gets accepted, we should devise some cleaner way of letting index AMs adjust their indexes' reldescs; maybe declare a new entry point column in pg_am that lets the AM modify the tupledesc constructed by this function before it gets used to create the index. But that is irrelevant to performance testing, so I'm not going to do it right now. regards, tom lane From tgl@sss.pgh.pa.us Thu Sep 4 23:11:38 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 57C6464FF27 for ; Thu, 4 Sep 2008 20:11:38 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 05699-03 for ; Thu, 4 Sep 2008 20:11:33 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 5F9DA64FCEB for ; Thu, 4 Sep 2008 20:11:33 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m84NBSIv007628; Thu, 4 Sep 2008 19:11:28 -0400 (EDT) To: Zdenek Kotala cc: Xiao Meng , pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: Re: hash index improving v3 In-reply-to: <29987.1220560114@sss.pgh.pa.us> References: <48BFDA8D.3080506@sun.com> <29987.1220560114@sss.pgh.pa.us> Comments: In-reply-to Tom Lane message dated "Thu, 04 Sep 2008 16:28:34 -0400" MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----- =_aaaaaaaaaa0" Content-ID: <7368.1220569711.0@sss.pgh.pa.us> Date: Thu, 04 Sep 2008 19:11:28 -0400 Message-ID: <7627.1220569888@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/42 X-Sequence-Number: 7057 ------- =_aaaaaaaaaa0 Content-Type: text/plain; charset="us-ascii" Content-ID: <7368.1220569711.1@sss.pgh.pa.us> Here is an updated patch incorporating Zdenek's review, my own observation that we should make the index tupledesc tell the truth, and some other fixes/improvements such as making backwards scans work as expected. The main thing lacking before this could be committed, from a code standpoint, is a cleaner solution to the problem of adjusting the index tupledesc (see the ugly hack in catalog/index.c). However, that complaint is irrelevant for functionality or performance testing, so I'm throwing this back out there in hopes someone will do some... I thought a little bit about how to extend this to store both hashcode and original index key, and realized that the desire to have a truthful index tupledesc makes that a *whole* lot harder. The planner, and really even the pg_index catalog representation, assume that the visible columns of an index are one-for-one with the index keys. We can slide through with the attached patch because this is still true --- effectively we're just using a "storage type" different from the indexed column's type for hash indexes, as already works for GIST and GIN. But having two visible columns would bollix up quite a lot of stuff. So I think if we actually want to do that, we'd need to revert to the concept of cheating on the tupledesc. Aside from the various uglinesses that I was able to remove from the original patch by not having that, I'm still quite concerned that we'd find something else wrong with doing that, further down the road. So my thinking right now is that we should just test this patch as-is. If it doesn't show really horrid performance when there are lots of hash key collisions, we should forget the store-both-things idea and just go with this. regards, tom lane ------- =_aaaaaaaaaa0 Content-Type: application/octet-stream Content-ID: <7368.1220569711.2@sss.pgh.pa.us> Content-Description: hash-v4.patch.gz Content-Transfer-Encoding: base64 H4sICMtkwEgCA2hhc2gtdjQucGF0Y2gA7Dz9U9tIsj87f8UkW5fYIBvLNmBgwxVLIOE2CSlwbvfV 3ZVLlsZYhyx5NRIfty//++uPGWlsCwObZLP73kulsC2Nemb6u3u6dRIH8mZXqNTfGHn+pYyDDc/3 pVIbE09N6E/Lf/Ly8/89OTs8F+Mwkrtiw79SaZJkG7ML9Uu0sXpu5+pJKrM0lFdhfCFS+FBhEgu3 5bZ7T4JwPBZNXzRT+i30ctfW1u7ZUc3dEX/LY9Fpt/ui3d7tbe22u6LZhn81Bt1sNu+D0RPncsYg Op3dThegMAhcgP2PFuR2dhy3uynoghC1E8T8IJ9FshZm+WwPruHljTUxTtKp8GIR4giR4RD4GYhZ EsaZCDPhZSKbSDGR3kzfXtt48lQQHPGSnxsilCHdrZ/JyMsAa69l9koqP63TiIYjrrwol8oRoYrz KGrgGghIcz8bZmEAsCb6l5LR2FriG8AAzyOVCJL4RaZXi3AAoJJSxEkGN8OYqBLGSqYZrhMRa3AB 35tfFxdDnNzGBQH6Njuv5IrNruNutQ1XbOAfsVYrH6w3AEtCA1lABKAgER7NIjJvFMkWPQ3bBxC0 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d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=dj8FJnwOO49+s3cYVKdXmhpfb8le6fLStQtztRaCFVQ=; b=FqCJSc2061kvRD41g6EtpHOJ4/sMuqyApwAO/S++v9LtLQvO2U7JbEu/slRwcj2Odh x96T2o+KuI7ZCMWTMbwGAmhK2q+x3dQQjx91lTkuK0UTSZ/fWndT9vGZAqn6tnIAV3ya JpaA028I9pePExxD2xiNXSUKSDHF7+4Jg2EKc= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=XcCjZxUgW6ZoOmOCRkoAxG+vQPqLBEBwZ5DXMNE/5BHEf4ca1NSUriGLHKvL6S/RjY NFhHi6jyhT+VzQZ3alYFX4EKL3f18FbqszL3Jneg/3pxMGqSbl3BKH0Ys+D28ZxNDCHy FYBbVTIQyPpBOZ2dsKFPlEX9dadqu2HpvJPe4= Received: by 10.187.203.4 with SMTP id f4mr2507130faq.1.1220575373058; Thu, 04 Sep 2008 17:42:53 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Thu, 4 Sep 2008 17:42:53 -0700 (PDT) Message-ID: <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> Date: Thu, 4 Sep 2008 18:42:53 -0600 From: "Alex Hunsaker" To: "Tom Lane" Subject: Re: hash index improving v3 Cc: "Zdenek Kotala" , "Xiao Meng" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <7627.1220569888@sss.pgh.pa.us> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <48BFDA8D.3080506@sun.com> <29987.1220560114@sss.pgh.pa.us> <7627.1220569888@sss.pgh.pa.us> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/43 X-Sequence-Number: 7058 On Thu, Sep 4, 2008 at 5:11 PM, Tom Lane wrote: > So my thinking right now is that we should just test this patch as-is. > If it doesn't show really horrid performance when there are lots of > hash key collisions, we should forget the store-both-things idea and > just go with this. Ok let me know if this is to naive of an approach or not hitting the right cases you want tested. create table hash_a (same text, uniq text); insert into hash_a (same, uniq) select 'same', n from generate_series(0, 5000) as n; create table hash_b (uniq text); insert into hash_b (uniq) select n from generate_series(5000, 10000) as n; pgbench -c 1 -t 100 -n -f of the following hash_same.sql: set enable_seqscan to off; set enable_mergejoin to off; select 1 from hash_a as a inner join hash_a as aa on aa.same = a.same; hash_uniq.sql: set enable_seqscan to off; set enable_mergejoin to off; select 1 from hash_a as a inner join hash_b as b on b.uniq = a.uniq; From tgl@sss.pgh.pa.us Fri Sep 5 01:13:28 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 6D47E64FCEF for ; Thu, 4 Sep 2008 22:13:28 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 34781-08 for ; Thu, 4 Sep 2008 22:13:25 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 8770D64FCEB for ; Thu, 4 Sep 2008 22:13:25 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m851DJTU010997; Thu, 4 Sep 2008 21:13:19 -0400 (EDT) To: "Alex Hunsaker" cc: "Zdenek Kotala" , "Xiao Meng" , pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: Re: hash index improving v3 In-reply-to: <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> References: <48BFDA8D.3080506@sun.com> <29987.1220560114@sss.pgh.pa.us> <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> Comments: In-reply-to "Alex Hunsaker" message dated "Thu, 04 Sep 2008 18:42:53 -0600" Date: Thu, 04 Sep 2008 21:13:18 -0400 Message-ID: <10995.1220577198@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/44 X-Sequence-Number: 7059 "Alex Hunsaker" writes: > Ok let me know if this is to naive of an approach or not hitting the > right cases you want tested. You have the unique-versus-not dimension, but I'm also wondering about narrow vs wide index keys (say about 8 bytes vs 50-100 or so). In the former case we're not saving any index space by storing only the hash code, so these could be expected to have different performance behaviors. As for specifics of the suggested scripts: * might be better to do select count(*) not select 1, so that client communication is minimized * check that the queries actually use the indexes (not sure that the proposed switch settings ensure this, not to mention you didn't create the indexes) * make sure the pgbench transaction counts are large enough to ensure significant runtime * the specific table sizes suggested are surely not large enough regards, tom lane From tgl@sss.pgh.pa.us Fri Sep 5 01:46:02 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 4606064FCEF for ; Thu, 4 Sep 2008 22:46:02 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 45832-09 for ; Thu, 4 Sep 2008 22:45:58 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id A7FF164FCE0 for ; Thu, 4 Sep 2008 22:45:58 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m851jrLx011526; Thu, 4 Sep 2008 21:45:53 -0400 (EDT) To: "Alex Hunsaker" cc: "Zdenek Kotala" , "Xiao Meng" , pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: Re: hash index improving v3 In-reply-to: <10995.1220577198@sss.pgh.pa.us> References: <48BFDA8D.3080506@sun.com> <29987.1220560114@sss.pgh.pa.us> <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> Comments: In-reply-to Tom Lane message dated "Thu, 04 Sep 2008 21:13:18 -0400" Date: Thu, 04 Sep 2008 21:45:53 -0400 Message-ID: <11525.1220579153@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/45 X-Sequence-Number: 7060 I wrote: > You have the unique-versus-not dimension, On second thought, actually not. What we want to look at is the penalty for false matches due to *distinct* key values that happen to have the same hash codes. Your test case for all-the-same is using all the same key values, which means it'll hit the heap a lot, but none of those will be wasted trips. So what we need for testing is a few different key values that hash to the same code. Not sure about an easy way to find such. regards, tom lane From badalex@gmail.com Fri Sep 5 01:51:20 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 946EE650189 for ; Thu, 4 Sep 2008 22:51:20 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 48253-08 for ; Thu, 4 Sep 2008 22:51:17 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.156]) by postgresql.org (Postfix) with ESMTP id 634EE650142 for ; Thu, 4 Sep 2008 22:51:16 -0300 (ADT) Received: by fg-out-1718.google.com with SMTP id 16so646524fgg.23 for ; Thu, 04 Sep 2008 18:51:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=j0CcHk2Kh2iY/g5XTJ2pVWSQBFZ7ibmkxEnc51Tjt0Q=; b=QE4TZ/VUhGGevIkL88/4T1XWoxTGJfqptr96HBozPujXYRPe5EqJLbbIZ/kl97zLve mDZLL8J9ukd06wK11RKY/7eyu7Uo4dsnft3AJttY8sgUnm3RD/dD8Lrcs0cBNR7oZpr3 6dNTnPeuXBffK7Pnc3gS7lPbKp5kYVxy8lx4Q= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=F19ArVkK2mDGX+cT+EirONTvkhMCGiWXUICYs3wi/z9s7SqoNo60hkDWc8MReVfx4Y LuWOw5HBgqdTNow2pShfwKRkny+JtV3bda+5PxACmqjaMmIt5LdiCdbrhoRjqfq4x0OT LQ/vk8uNv6ws06lo8RD0fJY7rJau4x6ggW2zI= Received: by 10.187.230.4 with SMTP id h4mr2512675far.12.1220579474819; Thu, 04 Sep 2008 18:51:14 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Thu, 4 Sep 2008 18:51:14 -0700 (PDT) Message-ID: <34d269d40809041851r3330198ej6ccd0ae53e4260f9@mail.gmail.com> Date: Thu, 4 Sep 2008 19:51:14 -0600 From: "Alex Hunsaker" To: "Tom Lane" Subject: Re: hash index improving v3 Cc: "Zdenek Kotala" , "Xiao Meng" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <10995.1220577198@sss.pgh.pa.us> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <48BFDA8D.3080506@sun.com> <29987.1220560114@sss.pgh.pa.us> <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/46 X-Sequence-Number: 7061 On Thu, Sep 4, 2008 at 7:13 PM, Tom Lane wrote: > "Alex Hunsaker" writes: >> Ok let me know if this is to naive of an approach or not hitting the >> right cases you want tested. > > You have the unique-versus-not dimension, but I'm also wondering about > narrow vs wide index keys (say about 8 bytes vs 50-100 or so). In the > former case we're not saving any index space by storing only the hash > code, so these could be expected to have different performance > behaviors. Arg yes... I just read the last part of your mail in this thread. I think it was the one on -hackers that talked about narrow vs wide... so I figured I would just try to do what the thread where you posted the patch talked about namley the below: >So my thinking right now is that we should just test this patch as-is. >If it doesn't show really horrid performance when there are lots of >hash key collisions, we should forget the store-both-things idea and >just go with this. So I thought, lets try to generate lots of hash collisions... obviosly though using the same key wont do that... Not sure what I was thinking > As for specifics of the suggested scripts: > > * might be better to do select count(*) not select 1, so that client > communication is minimized Yar. > * check that the queries actually use the indexes (not sure that the > proposed switch settings ensure this, not to mention you didn't create > the indexes) Well I was assuming I could just test the speed of a hash join... > * make sure the pgbench transaction counts are large enough to ensure > significant runtime > * the specific table sizes suggested are surely not large enough Ok From badalex@gmail.com Fri Sep 5 01:54:56 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 5930565013E for ; Thu, 4 Sep 2008 22:54:56 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 51510-07 for ; Thu, 4 Sep 2008 22:54:53 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.152]) by postgresql.org (Postfix) with ESMTP id 4DDE3650138 for ; Thu, 4 Sep 2008 22:54:53 -0300 (ADT) Received: by fg-out-1718.google.com with SMTP id 16so647267fgg.23 for ; Thu, 04 Sep 2008 18:54:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=m+9W61SFAeVHQpDi62fhDcsXbHqDJ8YhDI/BA+Nk4UI=; b=LKQdqATrqYtwmROUleUxPlUkWJcdHiyplJM70n/959Kg8/UnQeKQxBYxSN6Z+ufdKa veauZ9wAa4+VYuWFIje9BCwLKwmuVfpTY5b46iD4OL7XaUF+94SsFFlyu8EIA0YEuIhf TdTcRA4gVlFSpwYa61dyNLefQbCnScQSx9NrY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=vDKDCMhgKXTjtnMwQsM4KaYjqhexO/EJkuAu9O/PqZqDrP+OvMlbY4Fhv46YBky+9J WIKjaOIpI/Uhn0bIA+1wiHpiHWDWauLx11GkxTB8OtmRI3I0eZ6k68y98K0kMr6TDr17 NiLRKeXP+DCpUmtfPLP7zRi/0h5Cn2rHDXEqY= Received: by 10.187.219.6 with SMTP id w6mr2514909faq.29.1220579691107; Thu, 04 Sep 2008 18:54:51 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Thu, 4 Sep 2008 18:54:51 -0700 (PDT) Message-ID: <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> Date: Thu, 4 Sep 2008 19:54:51 -0600 From: "Alex Hunsaker" To: "Tom Lane" Subject: Re: hash index improving v3 Cc: "Zdenek Kotala" , "Xiao Meng" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <11525.1220579153@sss.pgh.pa.us> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <48BFDA8D.3080506@sun.com> <29987.1220560114@sss.pgh.pa.us> <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> <11525.1220579153@sss.pgh.pa.us> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/47 X-Sequence-Number: 7062 On Thu, Sep 4, 2008 at 7:45 PM, Tom Lane wrote: > So what we need for testing is a few different key values that hash to > the same code. Not sure about an easy way to find such. Hrm, well I have not really looked at the hash algorithm but I assume we could just reduce the number of buckets? From tgl@sss.pgh.pa.us Fri Sep 5 02:17:15 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id E86EA64FEDB for ; Thu, 4 Sep 2008 23:17:15 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 66330-06 for ; Thu, 4 Sep 2008 23:17:12 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 0251A64FCF7 for ; Thu, 4 Sep 2008 23:17:12 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m852H8Hp011963; Thu, 4 Sep 2008 22:17:08 -0400 (EDT) To: "Alex Hunsaker" cc: "Zdenek Kotala" , "Xiao Meng" , pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: Re: hash index improving v3 In-reply-to: <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> References: <48BFDA8D.3080506@sun.com> <29987.1220560114@sss.pgh.pa.us> <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> <11525.1220579153@sss.pgh.pa.us> <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> Comments: In-reply-to "Alex Hunsaker" message dated "Thu, 04 Sep 2008 19:54:51 -0600" Date: Thu, 04 Sep 2008 22:17:07 -0400 Message-ID: <11962.1220581027@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/49 X-Sequence-Number: 7064 "Alex Hunsaker" writes: > On Thu, Sep 4, 2008 at 7:45 PM, Tom Lane wrote: >> So what we need for testing is a few different key values that hash to >> the same code. Not sure about an easy way to find such. > Hrm, well I have not really looked at the hash algorithm but I assume > we could just reduce the number of buckets? No, we need fully equal hash keys, else the code won't visit the heap. I guess one thing we could do for testing purposes is lobotomize one of the datatype-specific hash functions. For instance, make int8_hash return the input mod 2^32, ignoring the upper bytes. Then it'd be easy to compute different int8s that hash to the same thing. regards, tom lane From tgl@sss.pgh.pa.us Fri Sep 5 02:19:13 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 9EC4864FCF7 for ; Thu, 4 Sep 2008 23:19:13 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 69119-04 for ; Thu, 4 Sep 2008 23:19:10 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 2D92864FCEF for ; Thu, 4 Sep 2008 23:19:09 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m852J5fU012088; Thu, 4 Sep 2008 22:19:05 -0400 (EDT) To: "Alex Hunsaker" cc: "Zdenek Kotala" , "Xiao Meng" , pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: Re: hash index improving v3 In-reply-to: <34d269d40809041851r3330198ej6ccd0ae53e4260f9@mail.gmail.com> References: <48BFDA8D.3080506@sun.com> <29987.1220560114@sss.pgh.pa.us> <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> <34d269d40809041851r3330198ej6ccd0ae53e4260f9@mail.gmail.com> Comments: In-reply-to "Alex Hunsaker" message dated "Thu, 04 Sep 2008 19:51:14 -0600" Date: Thu, 04 Sep 2008 22:19:05 -0400 Message-ID: <12087.1220581145@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/50 X-Sequence-Number: 7065 "Alex Hunsaker" writes: > On Thu, Sep 4, 2008 at 7:13 PM, Tom Lane wrote: >> * check that the queries actually use the indexes (not sure that the >> proposed switch settings ensure this, not to mention you didn't create >> the indexes) > Well I was assuming I could just test the speed of a hash join... Uh, no, hash joins have nearly zip to do with hash indexes. They rely on the same per-datatype support functions but that's the end of the commonality. regards, tom lane From badalex@gmail.com Fri Sep 5 03:49:48 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id AEA6A64FF05 for ; Fri, 5 Sep 2008 00:49:48 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 18524-03-8 for ; Fri, 5 Sep 2008 00:49:40 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.158]) by postgresql.org (Postfix) with ESMTP id 1277965015A for ; Fri, 5 Sep 2008 00:48:43 -0300 (ADT) Received: by fg-out-1718.google.com with SMTP id 16so671555fgg.23 for ; Thu, 04 Sep 2008 20:48:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=mmt55Gp1GxRGIhZwcJRS5XhdFaEVsnbNDHLxcRV4scA=; b=OKu17yPgY1wDO7sWIB0L/LPbzmdvhpKAMa2gGttDNHO64omQV7f7vr/m0noWCu1+kJ nlnUYYmB70tIxbb8rASPIHctnKZk/LGu5akUcyCICZmi5fpaJjezXJVemeEB9fLY8WRY Jd5qdaNVfaA0ZWQPCu9/53VSWWOc4vwxZcViA= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=rH0FWJEHshBclhpd+4yZNMRMksJUWdu3nY4zFrZ+Ueuf6R5W+7wjtpJ4I1RWjVP8Kc XirhkoCguifhBWVrlohplkLpsI7bSwAuuI5KNsUfSqcR0c7w+e5+duUeN2d0qZ3+T4Vu elO9vgwfLElvkuOmN+i7UqozZlGNExVFXKNoA= Received: by 10.187.241.11 with SMTP id t11mr2507116far.101.1220586521937; Thu, 04 Sep 2008 20:48:41 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Thu, 4 Sep 2008 20:48:41 -0700 (PDT) Message-ID: <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> Date: Thu, 4 Sep 2008 21:48:41 -0600 From: "Alex Hunsaker" To: "Tom Lane" Subject: Re: hash index improving v3 Cc: "Zdenek Kotala" , "Xiao Meng" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <11962.1220581027@sss.pgh.pa.us> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <48BFDA8D.3080506@sun.com> <29987.1220560114@sss.pgh.pa.us> <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> <11525.1220579153@sss.pgh.pa.us> <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <11962.1220581027@sss.pgh.pa.us> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/51 X-Sequence-Number: 7066 On Thu, Sep 4, 2008 at 8:17 PM, Tom Lane wrote: > I guess one thing we could do for testing purposes is lobotomize one of > the datatype-specific hash functions. For instance, make int8_hash > return the input mod 2^32, ignoring the upper bytes. Then it'd be easy > to compute different int8s that hash to the same thing. Heh Ok im slowly getting there... So we lobotomize hashint8 and then time how long it takes to make an index on a table... something like: create table test_hash(num int8); (obviously on a 64 bit machine) int main(void) { unsigned long y = 0; unsigned cnt = 0; printf("insert into test_hash (num) values "); //while(cnt != LONG_MAX/UINT_MAX) while(cnt < 10000000) { y += UINT_MAX; printf("(%ld), ", y); cnt++; } printf("(0);\n"); } ./a.out | psql pgbench -c 1 -t1000 -n -f test.sql test.sql: create index test_hash_num_idx on test_hash using hash (num); drop index test_hash_num_idx; For both pre and post patch just to make sure post patch is not worse than pre patch??? If im still way off and its not to much trouble want to give me a test case to run =) ? Or maybe because hash collisions should be fairly rare its not something to really worry about? From badalex@gmail.com Fri Sep 5 06:32:22 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id CAC3664FCEE for ; Fri, 5 Sep 2008 03:32:22 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 74679-09 for ; Fri, 5 Sep 2008 03:32:18 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.157]) by postgresql.org (Postfix) with ESMTP id 1A29A64FCBA for ; Fri, 5 Sep 2008 03:32:17 -0300 (ADT) Received: by fg-out-1718.google.com with SMTP id 16so703768fgg.23 for ; Thu, 04 Sep 2008 23:32:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=WXBsgSZlSs075SfEvO/WL0h2lIxjKi2sfWnSu5xr5vo=; b=B75sW3ZorNLlxLMAPjG65jgid25CdatD2AW4FSXfMIY2G5C8lCbGZg/0HRGeoMcCI/ ZgjYn2buWLDzm0V4wgGDHNa15gPih1G7dztxccTyLBBGEgq50SItfdpWB+KXhcvqIja8 VcU1R+TU3bgIRNKlAWC6TAIVLhFdiwuihvsoM= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=jQ/7bPvPvhxnkuyqxHKwLqrpkdIgi4e0cQgVWHFc4B2CobJgx8WaR6ml0T3z5nGvnx iVKoPaLL1pc/yfeEYHPuUDhKgRuvh7Y66NEYJiIV7Y4C9J5h0ZGfn1UoWyEO0TTKgMzE wh+9xFOHTVXncB+Fxyq/r2tIlchhCzwUZb1cs= Received: by 10.187.172.9 with SMTP id z9mr2534139fao.33.1220596336366; Thu, 04 Sep 2008 23:32:16 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Thu, 4 Sep 2008 23:32:16 -0700 (PDT) Message-ID: <34d269d40809042332l7a1ac5e9t8b1dded2b951dcd2@mail.gmail.com> Date: Fri, 5 Sep 2008 00:32:16 -0600 From: "Alex Hunsaker" To: "Tom Lane" Subject: Re: hash index improving v3 Cc: "Zdenek Kotala" , "Xiao Meng" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <48BFDA8D.3080506@sun.com> <29987.1220560114@sss.pgh.pa.us> <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> <11525.1220579153@sss.pgh.pa.us> <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/52 X-Sequence-Number: 7067 On Thu, Sep 4, 2008 at 9:48 PM, Alex Hunsaker wrote: Ok here are the results: (data generated from the c program before) select count(1) from test_hash; count ----------- 100000011 create index test_hash_num_idx on test_hash using hash (num); CVS: Time: 698065.180 ms patch: Time: 565982.099 ms ./pgbench -c 1 -t 100000 -n -f bench.sql bench.sql select count(1) from test_hash where num = 110034304728896610; CVS: tps = 7232.375875 (excluding connections establishing) patch: tps = 7913.700150 (excluding connections establishing) EXPLAIN ANALYZE select count(1) from test_hash where num = 110034304728896610; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------ Aggregate (cost=29.24..29.25 rows=1 width=0) (actual time=0.066..0.067 rows=1 loops=1) -> Index Scan using test_hash_num_idx on test_hash (cost=0.00..29.24 rows=1 width=0) (actual time=0.051..0.054 rows=1 loops=1) Index Cond: (num = 110034304728896610::bigint) Total runtime: 0.153 ms Oddly the index sizes were the same (4096 MB) is that to be expected? Here is the change I made to hashint8 --- a/src/backend/access/hash/hashfunc.c +++ b/src/backend/access/hash/hashfunc.c @@ -61,12 +61,14 @@ hashint8(PG_FUNCTION_ARGS) */ #ifndef INT64_IS_BUSTED int64 val = PG_GETARG_INT64(0); - uint32 lohalf = (uint32) val; +/* uint32 lohalf = (uint32) val; uint32 hihalf = (uint32) (val >> 32); lohalf ^= (val >= 0) ? hihalf : ~hihalf; return hash_uint32(lohalf); +*/ + return val % 4294967296; #else /* here if we can't count on "x >> 32" to work sanely */ return hash_uint32((int32) PG_GETARG_INT64(0)); From Zdenek.Kotala@Sun.COM Fri Sep 5 06:47:16 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id BA41F650142 for ; Fri, 5 Sep 2008 03:47:16 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 82647-09-2 for ; Fri, 5 Sep 2008 03:47:13 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from gmp-eb-inf-1.sun.com (gmp-eb-inf-1.sun.com [192.18.6.21]) by postgresql.org (Postfix) with ESMTP id EBE9064FF8A for ; Fri, 5 Sep 2008 03:47:05 -0300 (ADT) Received: from fe-emea-10.sun.com (gmp-eb-lb-2-fe3.eu.sun.com [192.18.6.12]) by gmp-eb-inf-1.sun.com (8.13.7+Sun/8.12.9) with ESMTP id m856l35b023084 for ; Fri, 5 Sep 2008 06:47:04 GMT Received: from conversion-daemon.fe-emea-10.sun.com by fe-emea-10.sun.com (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) id <0K6P00801MSIL000@fe-emea-10.sun.com> (original mail from Zdenek.Kotala@Sun.COM) for pgsql-patches@postgresql.org; Fri, 05 Sep 2008 07:47:03 +0100 (BST) Received: from [192.168.1.101] ([89.102.161.149]) by fe-emea-10.sun.com (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) with ESMTPSA id <0K6P0065AMUDW770@fe-emea-10.sun.com>; Fri, 05 Sep 2008 07:47:02 +0100 (BST) Date: Fri, 05 Sep 2008 08:43:14 +0200 From: Zdenek Kotala Subject: Re: hash index improving v3 In-reply-to: <34d269d40809042332l7a1ac5e9t8b1dded2b951dcd2@mail.gmail.com> To: Alex Hunsaker Cc: Tom Lane , Xiao Meng , pgsql-patches@postgresql.org, "Jonah H. Harris" Message-id: <48C0D502.80809@sun.com> MIME-version: 1.0 Content-type: text/plain; format=flowed; charset=ISO-8859-1 Content-transfer-encoding: 7BIT References: <48BFDA8D.3080506@sun.com> <29987.1220560114@sss.pgh.pa.us> <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> <11525.1220579153@sss.pgh.pa.us> <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809042332l7a1ac5e9t8b1dded2b951dcd2@mail.gmail.com> User-Agent: Thunderbird 2.0.0.16 (X11/20080811) X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200809/53 X-Sequence-Number: 7068 Alex Hunsaker napsal(a): > On Thu, Sep 4, 2008 at 9:48 PM, Alex Hunsaker wrote: > > Ok here are the results: > > (data generated from the c program before) > select count(1) from test_hash; > count > ----------- > 100000011 > > create index test_hash_num_idx on test_hash using hash (num); > CVS: Time: 698065.180 ms > patch: Time: 565982.099 ms > > ./pgbench -c 1 -t 100000 -n -f bench.sql > bench.sql > select count(1) from test_hash where num = 110034304728896610; > > CVS: tps = 7232.375875 (excluding connections establishing) > patch: tps = 7913.700150 (excluding connections establishing) > > EXPLAIN ANALYZE select count(1) from test_hash where num = 110034304728896610; > QUERY > PLAN > ------------------------------------------------------------------------------------------------------------------------------------ > Aggregate (cost=29.24..29.25 rows=1 width=0) (actual > time=0.066..0.067 rows=1 loops=1) > -> Index Scan using test_hash_num_idx on test_hash > (cost=0.00..29.24 rows=1 width=0) (actual time=0.051..0.054 rows=1 > loops=1) > Index Cond: (num = 110034304728896610::bigint) > Total runtime: 0.153 ms > > > Oddly the index sizes were the same (4096 MB) is that to be expected? I think yes, because haskey is uint32. You save space only if you use hash for example on varchar attribute. Zdenek From mx.cogito@gmail.com Fri Sep 5 13:05:58 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id CAD1F64FCEB for ; Fri, 5 Sep 2008 10:05:58 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 96647-03 for ; Fri, 5 Sep 2008 10:05:44 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from ti-out-0910.google.com (ti-out-0910.google.com [209.85.142.187]) by postgresql.org (Postfix) with ESMTP id E96EC64FCE3 for ; Fri, 5 Sep 2008 10:05:41 -0300 (ADT) Received: by ti-out-0910.google.com with SMTP id y8so299673tia.5 for ; Fri, 05 Sep 2008 06:05:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type:references; bh=7/AJNUNMWfIJNV9GIsT5DZZNjdkEZz+e+IqpD+EspUc=; b=sR9NTopemaSJg7N44P13R0mILhgxsElmpJctnDNeKMM0pXW2oWWzdS/rOtrSf07hW8 zSqJ5ByY8WrNNE8sjrX/kg7jNfLfxL74vGOT1UjrOoqnlk1/8mMzGwIV/jaaUrUGToM3 YzKtz0Ssf7pKFbeg6f8S72e2Cp+6aHrWxvHCw= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:references; b=HdZx+o1zmWYsCh4GJ6p+PhWqm1rVg/q7uwfFr8ZYdoE3d9g+MRhbPcKSRkPjpwKtit HgIijB1BgltWJL5Jf8cXgypDc/gedrg65h7I/CsW+CzuBEGdDE0WpbdEblj4ARJHZgjY tZ0r2udvdtND9oNKv1Lqzq4pNLPKWO5MKuJV8= Received: by 10.110.49.6 with SMTP id w6mr14977386tiw.6.1220619938627; Fri, 05 Sep 2008 06:05:38 -0700 (PDT) Received: by 10.110.8.14 with HTTP; Fri, 5 Sep 2008 06:05:38 -0700 (PDT) Message-ID: Date: Fri, 5 Sep 2008 21:05:38 +0800 From: "Xiao Meng" To: "Simon Riggs" Subject: Re: hash index improving v3 Cc: pgsql-patches@postgresql.org In-Reply-To: <1220547424.4371.991.camel@ebony.2ndQuadrant> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_119065_14303673.1220619938624" References: <1220494002.4371.813.camel@ebony.2ndQuadrant> <1220547424.4371.991.camel@ebony.2ndQuadrant> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0.001 tagged_above=0 required=5 tests=HTML_MESSAGE=0.001 X-Spam-Level: X-Archive-Number: 200809/54 X-Sequence-Number: 7069 ------=_Part_119065_14303673.1220619938624 Content-Type: multipart/alternative; boundary="----=_Part_119066_18802217.1220619938624" ------=_Part_119066_18802217.1220619938624 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline On Fri, Sep 5, 2008 at 12:57 AM, Simon Riggs wrote: > That generates the data, fine. What about the test query? > > You say you are running this command line > pgbench -U postgres -n -f /tmp/query.sql dict > > Where is query.sql? > oh,sorry. I forgot it. The attachment is query.sql and the generator. -- Best Regards, Xiao Meng DKERC, Harbin Institute of Technology, China Gtalk: mx.cogito@gmail.com MSN: cnEnder@live.com http://xiaomeng.yo2.cn ------=_Part_119066_18802217.1220619938624 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline
On Fri, Sep 5, 2008 at 12:57 AM, Simon Riggs <simon@2ndquadrant.com> wrote:
That generates the data, fine. What about the test query?

You say you are running this command line
 pgbench -U postgres -n -f /tmp/query.sql  dict

Where is query.sql?
oh,sorry. I forgot it.
The attachment is query.sql and the generator.


--
Best Regards,
Xiao Meng

DKERC, Harbin Institute of Technology, China
Gtalk: mx.cogito@gmail.com
MSN: cnEnder@live.com
http://xiaomeng.yo2.cn
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X-Attachment-Id: f_fkqtl5ue1 Content-Disposition: attachment; filename=genQuery.cpp I2luY2x1ZGUgPGZzdHJlYW0+CiNpbmNsdWRlIDxzdHJpbmc+CiNpbmNsdWRlIDxjc3RkbGliPgp1 c2luZyBuYW1lc3BhY2Ugc3RkOwpib29sIGlzX3NlbGVjdGVkKGRvdWJsZSByYXRlKXsKCSByZXR1 cm4gcmFuZCgpIDwgIFJBTkRfTUFYICogcmF0ZSAtMTsKfQppbnQgbWFpbigpewoJb2ZzdHJlYW0J cXVlcnkoInF1ZXJ5LnNxbCIpOwoJaWZzdHJlYW0gCWRpY3QoIi90bXAvd29yZHMiKTsKCXN0cmlu ZwkJd29yZHM7Cgljb25zdCBpbnQJY250ID0gMjAwMDsKCWNvbnN0IGludAl0b3RhbCA9IDM5OTE2 ODAwOwoJZG91YmxlCQlyYXRlID0gKGRvdWJsZSljbnQvKGRvdWJsZSl0b3RhbDsKCXNyYW5kKHRp bWUoTlVMTCkpOwoJZm9yKGludCBpPTAgOyBpPGNudCA7IGkrKyl7CgkJd2hpbGUoIWlzX3NlbGVj dGVkKHJhdGUpICl7CgkJCWRpY3QgPj4gd29yZHMgOwoJCX0KCQlxdWVyeSA8PCAiU0VMRUNUICog RlJPTSBkaWN0IFdIRVJFIHdvcmQgPSAnIiA8PCB3b3JkcyA8PCInIDsiPDxlbmRsOwoJfQp9CgoK ------=_Part_119065_14303673.1220619938624-- From badalex@gmail.com Fri Sep 5 16:12:13 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id E3D7964FF27 for ; Fri, 5 Sep 2008 13:12:13 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 61168-07 for ; Fri, 5 Sep 2008 13:12:04 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from gv-out-0910.google.com (gv-out-0910.google.com [216.239.58.191]) by postgresql.org (Postfix) with ESMTP id 4922D64FCEB for ; Fri, 5 Sep 2008 13:12:04 -0300 (ADT) Received: by gv-out-0910.google.com with SMTP id i36so42714gve.7 for ; Fri, 05 Sep 2008 09:12:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=yvXWmx7qfGiPR/+fcVLObgU5vpqksEyqKyjwLSYam0c=; b=A03MJI+l1GHRA5BJscTrin+vxprFTxfZwPWy/654ZPJiHXdeC8jxsgJ2n+PirOwDSS MNSsF1rWQTaX1qs0ddXvOYae/mdGTVAYA1XCRCW10Nr/Eng/u8Q+eOriDv5LDApqq/WS exDS2VEQ7HQeG4NIBhCA+kxVgroKmJB1Vi6Wk= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=DgaI+1KuUWa99OgVsvdu+m9lxGjC9Kxw8bki8m7moNlFGyGHipQtMKkpucqo5mxhIE cUjtZZBgxcliSRB0VanGqxo9RsGqfR4Cf9OeTSwdbOJn6Pm+u8ob4Y7FVUO1nndMhGh0 YASQ5WUmmSqv6vVElWD35jWaKrSMrsjKpnDd8= Received: by 10.187.183.15 with SMTP id k15mr2570110fap.86.1220631121922; Fri, 05 Sep 2008 09:12:01 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Fri, 5 Sep 2008 09:12:01 -0700 (PDT) Message-ID: <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> Date: Fri, 5 Sep 2008 10:12:01 -0600 From: "Alex Hunsaker" To: "Tom Lane" Subject: Re: hash index improving v3 Cc: "Zdenek Kotala" , "Xiao Meng" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <48BFDA8D.3080506@sun.com> <29987.1220560114@sss.pgh.pa.us> <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> <11525.1220579153@sss.pgh.pa.us> <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/55 X-Sequence-Number: 7070 On Thu, Sep 4, 2008 at 9:48 PM, Alex Hunsaker wrote: > (obviously on a 64 bit machine) > int main(void) > { > unsigned long y = 0; > unsigned cnt = 0; > > printf("insert into test_hash (num) values "); > > //while(cnt != LONG_MAX/UINT_MAX) > while(cnt < 10000000) > { > y += UINT_MAX; > > printf("(%ld), ", y); > > cnt++; > } > > printf("(0);\n"); > > } Argh sorry I must have been smoking something yesterday thats supposed to be y+= UINT_MAX + 1 so the benchmarking I did was worthless... running again with the right values.... From badalex@gmail.com Fri Sep 5 20:21:41 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id D9D9165005C for ; Fri, 5 Sep 2008 17:21:41 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 43447-02 for ; Fri, 5 Sep 2008 17:21:39 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from nf-out-0910.google.com (nf-out-0910.google.com [64.233.182.184]) by postgresql.org (Postfix) with ESMTP id 4E6F564FFF4 for ; Fri, 5 Sep 2008 17:21:39 -0300 (ADT) Received: by nf-out-0910.google.com with SMTP id c7so187803nfi.23 for ; Fri, 05 Sep 2008 13:21:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=rD77f1WsIY0F3qrrsaXjZ5FM7Ao6YJEe9eHW3+VDlCU=; b=PAMG5Ahau00BGASdF2tZtP3Qdqqoi7ZI+aQ1VgH2AyVYrmQ/vYioIJSOxylY1cGgH4 6AHu/337zi3w000BXbY/HUIpaaSmgyW+mCFnGZxkgkEUbrGHufJyZfLKMt2cbfSePxMx BdykHMdTrjSbiy3LSCBf1O++pyAqibS66p74s= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=dbghcDbrAquMCmQmQB2A3aDaJP2OwFrMFnGcQX+YSRX8AiDCbe3JyVSuv22T1o0YBP f09Gy9HXvU93oPDPYAvyJTtb1IKYwt/Hiam/yYonBR5paYb3ek0LPvp7J5VCSY2m3EeF aDw7kM2kA89ErsuocOj8mE/Dmd4qSkB/D2JWQ= Received: by 10.187.231.1 with SMTP id i1mr1009621far.18.1220646096894; Fri, 05 Sep 2008 13:21:36 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Fri, 5 Sep 2008 13:21:36 -0700 (PDT) Message-ID: <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> Date: Fri, 5 Sep 2008 14:21:36 -0600 From: "Alex Hunsaker" To: "Xiao Meng" Subject: Re: hash index improving v3 Cc: "Zdenek Kotala" , pgsql-patches@postgresql.org, "Jonah H. Harris" , "Tom Lane" In-Reply-To: <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <29987.1220560114@sss.pgh.pa.us> <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> <11525.1220579153@sss.pgh.pa.us> <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/63 X-Sequence-Number: 7078 Ok now that I made it so it actually *test* collisions, with the patch it always returns all rows that matched the hashed "key". For example (non lobotomized inthash8, I just brute forced some collisions for 0 so that anyone can try this) create table test_hash (num int8); insert into test_hash (num) values (0), (1805671691), (3294821164), (4294967297); create index test_hash_num_idx on test_hash using hash (num); select * from test_hash where num = 0; num ------------ 0 1805671691 3294821164 4294967297 set enable_bitmapscan to off; select * from test_hash where num = 0; num ----- 0 CVS HEAD, 8_3_STABLE obviously work if I force the index scan From badalex@gmail.com Sat Sep 6 05:49:13 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id A2FF164FD2C for ; Sat, 6 Sep 2008 02:49:13 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 41785-05 for ; Sat, 6 Sep 2008 02:49:07 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from fk-out-0910.google.com (fk-out-0910.google.com [209.85.128.185]) by postgresql.org (Postfix) with ESMTP id 3FC0164FD0F for ; Sat, 6 Sep 2008 02:49:06 -0300 (ADT) Received: by fk-out-0910.google.com with SMTP id e30so526208fke.3 for ; Fri, 05 Sep 2008 22:49:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=xUf1jWFtiGsWxXgtk8HFo2z0tEydYrtOKpPAcKZUTtI=; b=Ild4Vieocz874iv5CcYJsCsbIOI+gyX3ZmGcYdLM4AnUnNkwFmBcvBL1KPzv1vbyWx wF2OsLd8e8HUF1wKZZb9+qCWASrLXVtK8FwNZVYSGXcU2J91ceNGdwfSUiIp4HZUodd3 0x5vLlIu9WDyu49rEIvx2GlbtWYLAFW0RZgC4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=u/cHcFpXmZI2o76pe01mfJwAddtN1JkIRbCxVjS5SpFHsCVyFfkLD1DAR0c74O+7KM oWsNVZVRC6xRalgK7BWfjsTRKirsfir3lNJPFSNUsvya089rNzof7yjVB1JFgll6hUZq 5FNAirMerm+g38t5t1P5h2KDXRbKaKSMbb6ig= Received: by 10.187.251.11 with SMTP id d11mr2654472fas.31.1220680145524; Fri, 05 Sep 2008 22:49:05 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Fri, 5 Sep 2008 22:49:05 -0700 (PDT) Message-ID: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> Date: Fri, 5 Sep 2008 23:49:05 -0600 From: "Alex Hunsaker" To: "Xiao Meng" Subject: Re: hash index improving v3 Cc: "Zdenek Kotala" , pgsql-patches@postgresql.org, "Jonah H. Harris" , "Tom Lane" In-Reply-To: <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> <11525.1220579153@sss.pgh.pa.us> <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/66 X-Sequence-Number: 7081 ] On Fri, Sep 5, 2008 at 2:21 PM, Alex Hunsaker wrote: > Ok now that I made it so it actually *test* collisions, with the patch > it always returns all rows that matched the hashed "key". And here is the fix, we just forget to set the recheck flag for bitmap scans. *** a/src/backend/access/hash/hash.c --- b/src/backend/access/hash/hash.c *************** *** 317,323 **** hashgetbitmap(PG_FUNCTION_ARGS) /* Save tuple ID, and continue scanning */ if (add_tuple) { ! tbm_add_tuples(tbm, &scan->xs_ctup.t_self, 1, false); ntids++; } --- 317,323 ---- /* Save tuple ID, and continue scanning */ if (add_tuple) { ! tbm_add_tuples(tbm, &scan->xs_ctup.t_self, 1, true); ntids++; } From tgl@sss.pgh.pa.us Sat Sep 6 18:14:37 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id AE6FC64FCBA for ; Sat, 6 Sep 2008 15:14:37 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 20952-02 for ; Sat, 6 Sep 2008 15:14:34 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id A7A2364FCBD for ; Sat, 6 Sep 2008 15:14:32 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m86IEQJT020928; Sat, 6 Sep 2008 14:14:26 -0400 (EDT) To: "Alex Hunsaker" cc: "Xiao Meng" , "Zdenek Kotala" , pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: Re: hash index improving v3 In-reply-to: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> References: <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> <11525.1220579153@sss.pgh.pa.us> <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> Comments: In-reply-to "Alex Hunsaker" message dated "Fri, 05 Sep 2008 23:49:05 -0600" Date: Sat, 06 Sep 2008 14:14:26 -0400 Message-ID: <20927.1220724866@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/67 X-Sequence-Number: 7082 "Alex Hunsaker" writes: > - tbm_add_tuples(tbm, &scan->xs_ctup.t_self, 1, false); > + tbm_add_tuples(tbm, &scan->xs_ctup.t_self, 1, true); Hah, I bet that explains Jonah's complaint that recheck didn't seem to be happening in his tests. Nice catch. regards, tom lane From tgl@sss.pgh.pa.us Sat Sep 6 19:09:46 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 9BAB664FCF2 for ; Sat, 6 Sep 2008 16:09:46 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 33434-10 for ; Sat, 6 Sep 2008 16:09:44 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 9600764FCCC for ; Sat, 6 Sep 2008 16:09:43 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m86J9cIJ022575; Sat, 6 Sep 2008 15:09:39 -0400 (EDT) To: "Alex Hunsaker" cc: "Xiao Meng" , "Zdenek Kotala" , pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: Re: hash index improving v3 In-reply-to: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> References: <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> <11525.1220579153@sss.pgh.pa.us> <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> Comments: In-reply-to "Alex Hunsaker" message dated "Fri, 05 Sep 2008 23:49:05 -0600" MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----- =_aaaaaaaaaa0" Content-ID: <22559.1220728135.0@sss.pgh.pa.us> Date: Sat, 06 Sep 2008 15:09:38 -0400 Message-ID: <22574.1220728178@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/68 X-Sequence-Number: 7083 ------- =_aaaaaaaaaa0 Content-Type: text/plain; charset="us-ascii" Content-ID: <22559.1220728135.1@sss.pgh.pa.us> "Alex Hunsaker" writes: > On Fri, Sep 5, 2008 at 2:21 PM, Alex Hunsaker wrote: >> Ok now that I made it so it actually *test* collisions, with the patch >> it always returns all rows that matched the hashed "key". > And here is the fix, we just forget to set the recheck flag for bitmap scans. For the convenience of anyone intending to test, here is an updated patch against CVS HEAD that incorporates Alex's fix. regards, tom lane ------- =_aaaaaaaaaa0 Content-Type: application/octet-stream Content-ID: <22559.1220728135.2@sss.pgh.pa.us> Content-Description: hash-v5.patch.gz Content-Transfer-Encoding: base64 H4sICLzUwkgCA2hhc2gtdjUucGF0Y2gA7Dz9U9tIsj87f8UkW5fYIBvLNmBgwxVLIOE2CSlwbvfV 3ZVLlsZYhyx5NRIfty//++uPGWlsCwObZLP73kulsD2Semb6u3u6dRIH8mZXqNTfGHn+pYyDDc/3 pVIbE09N6E/Lf/Ly8/89OTs8F+Mwkrtiw79SaZJkG7ML9Uu0sXpu5+pJKrM0lFdhfCFS+FBhEgu3 5bZ7T4JwPBZNXzRT+i30ctfW1u7ZUc3dEX/LY9Fpt/ui3d7tbe22u6LZhn81Bt1sNu+DsSXO5YxB uDu77a1dt80gcAH2P1qQ29lx3O6moAEhaieI+UE+i2QtzPLZHozh8MaaGCfpVHixCPEOkeEt8DMQ sySMMxFmwstENpFiIr2Zvry28eSpIDjiJT83RChDulo/k5GXAdZey+yVVH5apzsajrjyolwqR4Qq zqOogWsgIM39bJiFAcCa6F9KRmNriW8AAzyPVCJI4heZXi3CAYBKShEnGVwMY6JKGCuZZrhORKzB BXxvfl1cDHFyGxcE6NvsvJIrNruOu9U2XLGBf8RarXyw3gAsCQ1kARGAgkR4NIvIvFEkW/Q0bB9A 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9QK9gBLNeSN6SQn5W4rQBxId6pAujg9fnK1Ok0S/za3Vc6thhY3Gb5ab7erqMjGBRIxJ6bpWRzMb Ioq9rdpiBtHf3UdJWOttOJV7qbpH3PxYL194WgriRsRILtG1y3VcBBibmiz45/7HFWcUPVN9U7cI CvZ8q8ekAJxUlNR/82fsLYBynebeZJsS/xwqIpvHRPMk9MGD2lm+iEXPkDBWsPHJCDdaoSzLPGrf itGe/A7TePXZryrg6sTtZeYc+1eheTUSdHpq0O6bayJ3Ijo8GvoJ4RfaoWh6v4P7o/ijHvyvEMSJ QSbgFcf+QRKrd3604nsgpOrSHdyeu3pTFetdp5572K7kM248h7wBQbgPheJ3JQBfAAA= ------- =_aaaaaaaaaa0-- From badalex@gmail.com Sun Sep 7 02:23:11 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 0EB0964FCCC for ; Sat, 6 Sep 2008 23:23:11 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 17930-04 for ; Sat, 6 Sep 2008 23:23:06 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.156]) by postgresql.org (Postfix) with ESMTP id 1589464FCC2 for ; Sat, 6 Sep 2008 23:23:07 -0300 (ADT) Received: by fg-out-1718.google.com with SMTP id 16so1156400fgg.23 for ; Sat, 06 Sep 2008 19:23:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type:references; bh=shcx59bajTRDmDuo/tWkP85WyuwTv1XRo6+itW9lSgs=; b=DojLiWSEk1wFtCbJ9S8QCFTqt/ycHp4nHTlnVXfzrrMhcQWLh84u5UqQmz/UTq3FDX xHTXnBMacHOODBv2aXkBKxp+4hNXh9rsfrpOwEeasHZirUPWvcqZIGPVpkmN6+rt+YkM 9fcfkvr9KuPA4dUSB5PEXyEtuZz92+XKK8mhg= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:references; b=O3kRZAnbSZwa+6k3P9XUcNiUJAsw9pDfYZ5PaDmHfnm2q8fprK5SwwbuQ/3YzasN3L R+7hL1878yriB7ND7/p6u79FQWFXv4Ad5GrnuWFoHhBLYM7Ru1r8WBn/xeVGH5tvTwvs owGejSK2prcKoEeopLTUkP9dFyzdff6GQihAc= Received: by 10.187.198.4 with SMTP id a4mr2737158faq.0.1220754186017; Sat, 06 Sep 2008 19:23:06 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Sat, 6 Sep 2008 19:23:05 -0700 (PDT) Message-ID: <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> Date: Sat, 6 Sep 2008 20:23:05 -0600 From: "Alex Hunsaker" To: "Tom Lane" Subject: Re: hash index improving v3 Cc: "Xiao Meng" , "Zdenek Kotala" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <22574.1220728178@sss.pgh.pa.us> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_55376_30888050.1220754186016" References: <10995.1220577198@sss.pgh.pa.us> <11525.1220579153@sss.pgh.pa.us> <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/79 X-Sequence-Number: 7094 ------=_Part_55376_30888050.1220754186016 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline On Sat, Sep 6, 2008 at 1:09 PM, Tom Lane wrote: >For the convenience of anyone intending to test, here is an updated >patch against CVS HEAD that incorporates Alex's fix. Here are the results for a table containing 1 million entries that will generate hash collisions. It paints a bad picture for the patch but then again im not sure how relevant the issue is. For example yesterday I imported a table with 10 million collisions and the create index is still running (now at about ~18 hours). Maybe we should warn if there are lots of collisions when creating the index and suggest you use a btree? Anyway here are the results. ./pgbench -c1 -n -t10 -f bench_createindex.sql cvs head: tps = 0.002169 v5 : tps = 0.002196 pgbench -c1 -n -t1000 -f bench_bitmap.sql cvs head: tps = 24.011871 v5: tps = 2.543123 pgbench -c1 -n -t1000 -f bench_index.sql cvs head: tps = 51.614502 v5: tps = 3.205542 pgbench -c1 -n -t1000 -f bench_seqscan.sql cvs head: tps = 8.553318 v5: tps = 9.836091 Table created via: create table test_hash (num int8); ./hash | psql -c 'copy test_hash from stdin;' ------=_Part_55376_30888050.1220754186016 Content-Type: application/octet-stream; name=bench_create.sql Content-Transfer-Encoding: base64 X-Attachment-Id: f_fksxw96b1 Content-Disposition: attachment; filename=bench_create.sql Y3JlYXRlIGluZGV4IHRlc3RfaGFzaF9udW1faGFzaF9pZHggb24gdGVzdF9oYXNoIHVzaW5nIGhh c2ggKG51bSk7CmRyb3AgaW5kZXggdGVzdF9oYXNoX251bV9oYXNoX2lkeDsK ------=_Part_55376_30888050.1220754186016 Content-Type: application/octet-stream; name=bench_index.sql Content-Transfer-Encoding: base64 X-Attachment-Id: f_fksxx1b62 Content-Disposition: attachment; filename=bench_index.sql c2V0IGVuYWJsZV9zZXFzY2FuIHRvIG9mZjsKc2V0IGVuYWJsZV9iaXRtYXBzY2FuIHRvIG9mZjsK U0VMRUNUIGNvdW50KDEpIGZyb20gdGVzdF9oYXNoIHdoZXJlIG51bSA9IDA7Cg== ------=_Part_55376_30888050.1220754186016 Content-Type: application/octet-stream; name=bench_seqscan.sql Content-Transfer-Encoding: base64 X-Attachment-Id: f_fksxx45i3 Content-Disposition: attachment; filename=bench_seqscan.sql c2V0IGVuYWJsZV9iaXRtYXBzY2FuIHRvIG9mZjsKc2V0IGVuYWJsZV9pbmRleHNjYW4gdG8gb2Zm OwpTRUxFQ1QgY291bnQoMSkgZnJvbSB0ZXN0X2hhc2ggd2hlcmUgbnVtID0gMDsK ------=_Part_55376_30888050.1220754186016 Content-Type: application/octet-stream; name=int8collide.patch Content-Transfer-Encoding: base64 X-Attachment-Id: f_fksxx8hm4 Content-Disposition: attachment; filename=int8collide.patch KioqIGEvc3JjL2JhY2tlbmQvYWNjZXNzL2hhc2gvaGFzaGZ1bmMuYwotLS0gYi9zcmMvYmFja2Vu ZC9hY2Nlc3MvaGFzaC9oYXNoZnVuYy5jCioqKioqKioqKioqKioqKgoqKiogNjIsNzAgKioqKiBo YXNoaW50OChQR19GVU5DVElPTl9BUkdTKQogICNpZm5kZWYgSU5UNjRfSVNfQlVTVEVECiAgCWlu dDY0CQl2YWwgPSBQR19HRVRBUkdfSU5UNjQoMCk7CiAgCXVpbnQzMgkJbG9oYWxmID0gKHVpbnQz MikgdmFsOwotIAl1aW50MzIJCWhpaGFsZiA9ICh1aW50MzIpICh2YWwgPj4gMzIpOwotIAotIAls b2hhbGYgXj0gKHZhbCA+PSAwKSA/IGhpaGFsZiA6IH5oaWhhbGY7CiAgCiAgCXJldHVybiBoYXNo X3VpbnQzMihsb2hhbGYpOwogICNlbHNlCi0tLSA2Miw2NyAtLS0tCg== ------=_Part_55376_30888050.1220754186016 Content-Type: text/x-csrc; name=hash.c Content-Transfer-Encoding: base64 X-Attachment-Id: f_fksy0epq5 Content-Disposition: attachment; filename=hash.c I2luY2x1ZGUgPHN0ZGlvLmg+CiNpbmNsdWRlIDxzdGRsaWIuaD4KI2luY2x1ZGUgPGxpbWl0cy5o PgoKaW50IG1haW4odm9pZCkKewoJdW5zaWduZWQgbG9uZyB5ID0gMDsKCXVuc2lnbmVkIGNudCA9 IDA7CgoJd2hpbGUoY250IDwgMTAwMDAwMCkKCXsKCQl5ICs9IFVJTlRfTUFYOwoJCXkgKz0gMTsK CgkJcHJpbnRmKCIlbGRcbiIsIHkpOwoKCQljbnQrKzsKCX0KfQo= ------=_Part_55376_30888050.1220754186016-- From badalex@gmail.com Sun Sep 7 02:24:38 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 5998164FCCC for ; Sat, 6 Sep 2008 23:24:38 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 17553-09 for ; Sat, 6 Sep 2008 23:24:34 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.154]) by postgresql.org (Postfix) with ESMTP id A603964FCC2 for ; Sat, 6 Sep 2008 23:24:35 -0300 (ADT) Received: by fg-out-1718.google.com with SMTP id 16so1156602fgg.23 for ; Sat, 06 Sep 2008 19:24:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type:references; bh=Q2SwkPfKhS/b9Of36EbdVgBPVYMXkMTzKXE+7bsmWMw=; b=EDakdxqcZYbP5PSx0rx/7GuXM3kKvW0k3whNY7Hv+9hV5+r7SmaNNX4EbAGyL6rTua fUr4e6ePXNSZidaZe0e3ldLdENkDMppLpVFaX6JZO891mB1OfXFzEj4cK1zQQEk2zdxs 9fdZ/Kfysqd3gvi/8WLvQ16+LJA7CuEUvhlzU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:references; b=ATEO7wHrzHTb/igtD4s+Qd5fi5hDAGR4HztZmke1M7vc+AtIZZzOhqoEx0UCbFcJow jhTfOuozxQ776So6toioP/oVlzYDLhL6iOx1JFfgF0IPKpESFeusbBEd3gN7oZ9b/yNy r2PAMMmt/VrndZ0evW/FYRaDQm7KD+sijbuGU= Received: by 10.187.158.2 with SMTP id k2mr2725070fao.15.1220754273625; Sat, 06 Sep 2008 19:24:33 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Sat, 6 Sep 2008 19:24:33 -0700 (PDT) Message-ID: <34d269d40809061924x1430c803n3b93d721a32f8dd9@mail.gmail.com> Date: Sat, 6 Sep 2008 20:24:33 -0600 From: "Alex Hunsaker" To: "Tom Lane" Subject: Re: hash index improving v3 Cc: "Xiao Meng" , "Zdenek Kotala" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_55381_27202064.1220754273625" References: <11525.1220579153@sss.pgh.pa.us> <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/80 X-Sequence-Number: 7095 ------=_Part_55381_27202064.1220754273625 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline 2008/9/6 Alex Hunsaker : > pgbench -c1 -n -t1000 -f bench_bitmap.sql > cvs head: tps = 24.011871 > v5: tps = 2.543123 oops forgot to attach bench_bitmap.sql ------=_Part_55381_27202064.1220754273625 Content-Type: application/octet-stream; name=bench_bitmap.sql Content-Transfer-Encoding: base64 X-Attachment-Id: f_fkt1jzwl5 Content-Disposition: attachment; filename=bench_bitmap.sql c2V0IGVuYWJsZV9zZXFzY2FuIHRvIG9mZjsKc2V0IGVuYWJsZV9pbmRleHNjYW4gdG8gb2ZmOwpT RUxFQ1QgY291bnQoMSkgZnJvbSB0ZXN0X2hhc2ggd2hlcmUgbnVtIGluICg0MjkxNTQxNTEyNTEy MTU1NTEzLCA0Mjk0OTY3Mjk2LCAwKTsK ------=_Part_55381_27202064.1220754273625-- From Zdenek.Kotala@Sun.COM Mon Sep 8 09:02:26 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 2130864FF6F for ; Mon, 8 Sep 2008 06:02:26 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 76959-07 for ; Mon, 8 Sep 2008 06:02:19 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from gmp-eb-inf-1.sun.com (gmp-eb-inf-1.sun.com [192.18.6.21]) by postgresql.org (Postfix) with ESMTP id 1D9E564FD16 for ; Mon, 8 Sep 2008 06:02:18 -0300 (ADT) Received: from fe-emea-10.sun.com (gmp-eb-lb-2-fe3.eu.sun.com [192.18.6.12]) by gmp-eb-inf-1.sun.com (8.13.7+Sun/8.12.9) with ESMTP id m8892H6Y027403 for ; Mon, 8 Sep 2008 09:02:17 GMT Received: from conversion-daemon.fe-emea-10.sun.com by fe-emea-10.sun.com (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) id <0K6V00901BA1M900@fe-emea-10.sun.com> (original mail from Zdenek.Kotala@Sun.COM) for pgsql-patches@postgresql.org; Mon, 08 Sep 2008 10:02:17 +0100 (BST) Received: from [192.168.1.101] ([89.102.161.149]) by fe-emea-10.sun.com (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) with ESMTPSA id <0K6V00BP4D3BY280@fe-emea-10.sun.com>; Mon, 08 Sep 2008 10:02:00 +0100 (BST) Date: Mon, 08 Sep 2008 10:58:09 +0200 From: Zdenek Kotala Subject: Re: hash index improving v3 In-reply-to: <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> To: Alex Hunsaker Cc: Xiao Meng , pgsql-patches@postgresql.org, "Jonah H. Harris" , Tom Lane Message-id: <48C4E921.20606@sun.com> MIME-version: 1.0 Content-type: text/plain; format=flowed; charset=ISO-8859-1 Content-transfer-encoding: 7BIT References: <29987.1220560114@sss.pgh.pa.us> <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> <11525.1220579153@sss.pgh.pa.us> <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> User-Agent: Thunderbird 2.0.0.16 (X11/20080811) X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200809/90 X-Sequence-Number: 7105 It is nice test case. It should be part of hash index regression test. Zdenek Alex Hunsaker napsal(a): > Ok now that I made it so it actually *test* collisions, with the patch > it always returns all rows that matched the hashed "key". For example > (non lobotomized inthash8, I just brute forced some collisions for 0 > so that anyone can try this) > > create table test_hash (num int8); > insert into test_hash (num) values (0), (1805671691), (3294821164), > (4294967297); > create index test_hash_num_idx on test_hash using hash (num); > select * from test_hash where num = 0; > num > ------------ > 0 > 1805671691 > 3294821164 > 4294967297 > > set enable_bitmapscan to off; > > select * from test_hash where num = 0; > num > ----- > 0 > > CVS HEAD, 8_3_STABLE obviously work if I force the index scan -- Zdenek Kotala Sun Microsystems Prague, Czech Republic http://sun.com/postgresql From Zdenek.Kotala@Sun.COM Mon Sep 8 14:24:12 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id CEEFD64FCEC for ; Mon, 8 Sep 2008 11:24:12 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 31392-03 for ; Mon, 8 Sep 2008 11:24:09 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from gmp-eb-inf-1.sun.com (gmp-eb-inf-1.sun.com [192.18.6.21]) by postgresql.org (Postfix) with ESMTP id 7FC2C64FCE6 for ; Mon, 8 Sep 2008 11:24:09 -0300 (ADT) Received: from fe-emea-10.sun.com (gmp-eb-lb-2-fe2.eu.sun.com [192.18.6.11]) by gmp-eb-inf-1.sun.com (8.13.7+Sun/8.12.9) with ESMTP id m88EO65A021566 for ; Mon, 8 Sep 2008 14:24:07 GMT Received: from conversion-daemon.fe-emea-10.sun.com by fe-emea-10.sun.com (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) id <0K6V00D01RS4NJ00@fe-emea-10.sun.com> (original mail from Zdenek.Kotala@Sun.COM) for pgsql-patches@postgresql.org; Mon, 08 Sep 2008 15:24:06 +0100 (BST) Received: from [192.168.1.101] ([89.102.161.149]) by fe-emea-10.sun.com (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) with ESMTPSA id <0K6V007OAS05M5F0@fe-emea-10.sun.com>; Mon, 08 Sep 2008 15:24:06 +0100 (BST) Date: Mon, 08 Sep 2008 16:20:15 +0200 From: Zdenek Kotala Subject: Re: hash index improving v3 In-reply-to: <22574.1220728178@sss.pgh.pa.us> To: Tom Lane Cc: Alex Hunsaker , Xiao Meng , pgsql-patches@postgresql.org, "Jonah H. Harris" Message-id: <48C5349F.4080300@sun.com> MIME-version: 1.0 Content-type: multipart/mixed; boundary="Boundary_(ID_m24wr7fv51+dn/euXc1KVw)" References: <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> <11525.1220579153@sss.pgh.pa.us> <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> User-Agent: Thunderbird 2.0.0.16 (X11/20080811) X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200809/91 X-Sequence-Number: 7106 This is a multi-part message in MIME format. --Boundary_(ID_m24wr7fv51+dn/euXc1KVw) Content-type: text/plain; format=flowed; charset=UTF-8 Content-transfer-encoding: 7BIT Tom Lane napsal(a): > "Alex Hunsaker" writes: >> On Fri, Sep 5, 2008 at 2:21 PM, Alex Hunsaker wrote: >>> Ok now that I made it so it actually *test* collisions, with the patch >>> it always returns all rows that matched the hashed "key". > >> And here is the fix, we just forget to set the recheck flag for bitmap scans. > > For the convenience of anyone intending to test, here is an updated > patch against CVS HEAD that incorporates Alex's fix. > Tom, I attach cleanup patch which we discussed last commit fest. It introduce new macros HashGetMetaPage and HashGetBitmap and of course, it break backward on disk format compatibility which we will break it anyway when Xiao's patch will be committed. Zdenek -- Zdenek Kotala Sun Microsystems Prague, Czech Republic http://sun.com/postgresql --Boundary_(ID_m24wr7fv51+dn/euXc1KVw) Content-type: text/x-diff; name=hash_cleanup.patch Content-transfer-encoding: 8BIT Content-disposition: inline; filename=hash_cleanup.patch běžné podadresáře: pgsql_hash.be486df40421/src a pgsql_hash/src běžné podadresáře: pgsql_hash.be486df40421/src/backend a pgsql_hash/src/backend běžné podadresáře: pgsql_hash.be486df40421/src/include a pgsql_hash/src/include běžné podadresáře: pgsql_hash.be486df40421/src/backend/access a pgsql_hash/src/backend/access běžné podadresáře: pgsql_hash.be486df40421/src/backend/access/hash a pgsql_hash/src/backend/access/hash diff -rc pgsql_hash.be486df40421/src/backend/access/hash/hash.c pgsql_hash/src/backend/access/hash/hash.c *** pgsql_hash.be486df40421/src/backend/access/hash/hash.c po zář 8 16:14:00 2008 --- pgsql_hash/src/backend/access/hash/hash.c po zář 8 16:14:00 2008 *************** *** 527,533 **** * each bucket. */ metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_READ, LH_META_PAGE); ! metap = (HashMetaPage) BufferGetPage(metabuf); orig_maxbucket = metap->hashm_maxbucket; orig_ntuples = metap->hashm_ntuples; memcpy(&local_metapage, metap, sizeof(local_metapage)); --- 527,533 ---- * each bucket. */ metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_READ, LH_META_PAGE); ! metap = HashPageGetMeta(BufferGetPage(metabuf)); orig_maxbucket = metap->hashm_maxbucket; orig_ntuples = metap->hashm_ntuples; memcpy(&local_metapage, metap, sizeof(local_metapage)); *************** *** 629,635 **** /* Write-lock metapage and check for split since we started */ metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_WRITE, LH_META_PAGE); ! metap = (HashMetaPage) BufferGetPage(metabuf); if (cur_maxbucket != metap->hashm_maxbucket) { --- 629,635 ---- /* Write-lock metapage and check for split since we started */ metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_WRITE, LH_META_PAGE); ! metap = HashPageGetMeta(BufferGetPage(metabuf)); if (cur_maxbucket != metap->hashm_maxbucket) { diff -rc pgsql_hash.be486df40421/src/backend/access/hash/hashinsert.c pgsql_hash/src/backend/access/hash/hashinsert.c *** pgsql_hash.be486df40421/src/backend/access/hash/hashinsert.c po zář 8 16:14:00 2008 --- pgsql_hash/src/backend/access/hash/hashinsert.c po zář 8 16:14:00 2008 *************** *** 69,75 **** /* Read the metapage */ metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_READ, LH_META_PAGE); ! metap = (HashMetaPage) BufferGetPage(metabuf); /* * Check whether the item can fit on a hash page at all. (Eventually, we --- 69,75 ---- /* Read the metapage */ metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_READ, LH_META_PAGE); ! metap = HashPageGetMeta(BufferGetPage(metabuf)); /* * Check whether the item can fit on a hash page at all. (Eventually, we diff -rc pgsql_hash.be486df40421/src/backend/access/hash/hashovfl.c pgsql_hash/src/backend/access/hash/hashovfl.c *** pgsql_hash.be486df40421/src/backend/access/hash/hashovfl.c po zář 8 16:14:00 2008 --- pgsql_hash/src/backend/access/hash/hashovfl.c po zář 8 16:14:00 2008 *************** *** 187,193 **** _hash_chgbufaccess(rel, metabuf, HASH_NOLOCK, HASH_WRITE); _hash_checkpage(rel, metabuf, LH_META_PAGE); ! metap = (HashMetaPage) BufferGetPage(metabuf); /* start search at hashm_firstfree */ orig_firstfree = metap->hashm_firstfree; --- 187,193 ---- _hash_chgbufaccess(rel, metabuf, HASH_NOLOCK, HASH_WRITE); _hash_checkpage(rel, metabuf, LH_META_PAGE); ! metap = HashPageGetMeta(BufferGetPage(metabuf)); /* start search at hashm_firstfree */ orig_firstfree = metap->hashm_firstfree; *************** *** 450,456 **** /* Read the metapage so we can determine which bitmap page to use */ metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_READ, LH_META_PAGE); ! metap = (HashMetaPage) BufferGetPage(metabuf); /* Identify which bit to set */ ovflbitno = blkno_to_bitno(metap, ovflblkno); --- 450,456 ---- /* Read the metapage so we can determine which bitmap page to use */ metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_READ, LH_META_PAGE); ! metap = HashPageGetMeta(BufferGetPage(metabuf)); /* Identify which bit to set */ ovflbitno = blkno_to_bitno(metap, ovflblkno); diff -rc pgsql_hash.be486df40421/src/backend/access/hash/hashpage.c pgsql_hash/src/backend/access/hash/hashpage.c *** pgsql_hash.be486df40421/src/backend/access/hash/hashpage.c po zář 8 16:14:00 2008 --- pgsql_hash/src/backend/access/hash/hashpage.c po zář 8 16:14:00 2008 *************** *** 395,401 **** pageopaque->hasho_flag = LH_META_PAGE; pageopaque->hasho_page_id = HASHO_PAGE_ID; ! metap = (HashMetaPage) pg; metap->hashm_magic = HASH_MAGIC; metap->hashm_version = HASH_VERSION; --- 395,401 ---- pageopaque->hasho_flag = LH_META_PAGE; pageopaque->hasho_page_id = HASHO_PAGE_ID; ! metap = HashPageGetMeta(pg); metap->hashm_magic = HASH_MAGIC; metap->hashm_version = HASH_VERSION; *************** *** 402,414 **** metap->hashm_ntuples = 0; metap->hashm_nmaps = 0; metap->hashm_ffactor = ffactor; ! metap->hashm_bsize = BufferGetPageSize(metabuf); /* find largest bitmap array size that will fit in page size */ for (i = _hash_log2(metap->hashm_bsize); i > 0; --i) { ! if ((1 << i) <= (metap->hashm_bsize - ! (MAXALIGN(sizeof(PageHeaderData)) + ! MAXALIGN(sizeof(HashPageOpaqueData))))) break; } Assert(i > 0); --- 402,412 ---- metap->hashm_ntuples = 0; metap->hashm_nmaps = 0; metap->hashm_ffactor = ffactor; ! metap->hashm_bsize = HashGetMaxBitmapSize(pg); /* find largest bitmap array size that will fit in page size */ for (i = _hash_log2(metap->hashm_bsize); i > 0; --i) { ! if ((1 << i) <= metap->hashm_bsize) break; } Assert(i > 0); *************** *** 532,538 **** _hash_chgbufaccess(rel, metabuf, HASH_NOLOCK, HASH_WRITE); _hash_checkpage(rel, metabuf, LH_META_PAGE); ! metap = (HashMetaPage) BufferGetPage(metabuf); /* * Check to see if split is still needed; someone else might have already --- 530,536 ---- _hash_chgbufaccess(rel, metabuf, HASH_NOLOCK, HASH_WRITE); _hash_checkpage(rel, metabuf, LH_META_PAGE); ! metap = HashPageGetMeta(BufferGetPage(metabuf)); /* * Check to see if split is still needed; someone else might have already diff -rc pgsql_hash.be486df40421/src/backend/access/hash/hashsearch.c pgsql_hash/src/backend/access/hash/hashsearch.c *** pgsql_hash.be486df40421/src/backend/access/hash/hashsearch.c po zář 8 16:14:00 2008 --- pgsql_hash/src/backend/access/hash/hashsearch.c po zář 8 16:14:00 2008 *************** *** 186,192 **** /* Read the metapage */ metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_READ, LH_META_PAGE); ! metap = (HashMetaPage) BufferGetPage(metabuf); /* * Compute the target bucket number, and convert to block number. --- 186,192 ---- /* Read the metapage */ metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_READ, LH_META_PAGE); ! metap = HashPageGetMeta(BufferGetPage(metabuf)); /* * Compute the target bucket number, and convert to block number. diff -rc pgsql_hash.be486df40421/src/backend/access/hash/hashutil.c pgsql_hash/src/backend/access/hash/hashutil.c *** pgsql_hash.be486df40421/src/backend/access/hash/hashutil.c po zář 8 16:14:00 2008 --- pgsql_hash/src/backend/access/hash/hashutil.c po zář 8 16:14:00 2008 *************** *** 190,196 **** */ if (flags == LH_META_PAGE) { ! HashMetaPage metap = (HashMetaPage) page; if (metap->hashm_magic != HASH_MAGIC) ereport(ERROR, --- 190,196 ---- */ if (flags == LH_META_PAGE) { ! HashMetaPage metap = HashPageGetMeta(page); if (metap->hashm_magic != HASH_MAGIC) ereport(ERROR, běžné podadresáře: pgsql_hash.be486df40421/src/include/access a pgsql_hash/src/include/access diff -rc pgsql_hash.be486df40421/src/include/access/hash.h pgsql_hash/src/include/access/hash.h *** pgsql_hash.be486df40421/src/include/access/hash.h po zář 8 16:14:00 2008 --- pgsql_hash/src/include/access/hash.h po zář 8 16:14:00 2008 *************** *** 138,144 **** typedef struct HashMetaPageData { - PageHeaderData hashm_phdr; /* pad for page header (do not use) */ uint32 hashm_magic; /* magic no. for hash tables */ uint32 hashm_version; /* version ID */ double hashm_ntuples; /* number of tuples stored in the table */ --- 138,143 ---- *************** *** 191,199 **** #define BMPGSZ_BIT(metap) ((metap)->hashm_bmsize << BYTE_TO_BIT) #define BMPG_SHIFT(metap) ((metap)->hashm_bmshift) #define BMPG_MASK(metap) (BMPGSZ_BIT(metap) - 1) - #define HashPageGetBitmap(pg) \ - ((uint32 *) (((char *) (pg)) + MAXALIGN(sizeof(PageHeaderData)))) /* * The number of bits in an ovflpage bitmap word. */ --- 190,207 ---- #define BMPGSZ_BIT(metap) ((metap)->hashm_bmsize << BYTE_TO_BIT) #define BMPG_SHIFT(metap) ((metap)->hashm_bmshift) #define BMPG_MASK(metap) (BMPGSZ_BIT(metap) - 1) + #define HashPageGetBitmap(page) \ + ((uint32*) PageGetContents(page)) + + #define HashGetMaxBitmapSize(page) \ + (PageGetPageSize((Page) page)- \ + (MAXALIGN(SizeOfPageHeaderData) + \ + MAXALIGN(sizeof(HashPageOpaqueData))) ) + + #define HashPageGetMeta(page) \ + ((HashMetaPage) PageGetContents(page)) + /* * The number of bits in an ovflpage bitmap word. */ --Boundary_(ID_m24wr7fv51+dn/euXc1KVw)-- From tgl@sss.pgh.pa.us Mon Sep 8 14:49:34 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 972E1650004 for ; Mon, 8 Sep 2008 11:49:34 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 35382-05 for ; Mon, 8 Sep 2008 11:49:24 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 7217164FD1C for ; Mon, 8 Sep 2008 11:49:23 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m88EnIMl014977; Mon, 8 Sep 2008 10:49:18 -0400 (EDT) To: Zdenek Kotala cc: Alex Hunsaker , Xiao Meng , pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: Re: hash index improving v3 In-reply-to: <48C5349F.4080300@sun.com> References: <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> <11525.1220579153@sss.pgh.pa.us> <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <48C5349F.4080300@sun.com> Comments: In-reply-to Zdenek Kotala message dated "Mon, 08 Sep 2008 16:20:15 +0200" Date: Mon, 08 Sep 2008 10:49:18 -0400 Message-ID: <14976.1220885358@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/93 X-Sequence-Number: 7108 Zdenek Kotala writes: > I attach cleanup patch which we discussed last commit fest. It introduce new > macros HashGetMetaPage and HashGetBitmap and of course, it break backward on > disk format compatibility which we will break it anyway when Xiao's patch will > be committed. If we accept that patch, I'm okay with including this one too. Still hoping for some performance testing though. (Note that this one isn't going to affect performance, so no need to include it for that purpose.) regards, tom lane From ktm@rice.edu Tue Sep 9 13:48:53 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id DD6ED64FCE2 for ; Tue, 9 Sep 2008 10:48:53 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 03301-04 for ; Tue, 9 Sep 2008 10:48:44 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from is.rice.edu (is.rice.edu [128.42.42.24]) by postgresql.org (Postfix) with ESMTP id 872C26500C9 for ; Tue, 9 Sep 2008 10:48:44 -0300 (ADT) Received: from scan1.mail.rice.edu (scan1.mail.rice.edu [128.42.58.160]) by is.rice.edu (Postfix) with ESMTP id 992714181D; Tue, 9 Sep 2008 08:48:40 -0500 (CDT) Received: from is.rice.edu ([128.42.42.24]) by scan1.mail.rice.edu (scan1.mail.rice.edu [128.42.58.160]) (amavisd-new, port 10024) with ESMTP id 17675-07; Tue, 9 Sep 2008 08:48:39 -0500 (CDT) Received: by is.rice.edu (Postfix, from userid 18612) id DC91D41819; Tue, 9 Sep 2008 08:48:39 -0500 (CDT) Date: Tue, 9 Sep 2008 08:48:39 -0500 From: Kenneth Marshall To: Alex Hunsaker Cc: Tom Lane , Xiao Meng , Zdenek Kotala , pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: Re: hash index improving v3 Message-ID: <20080909134839.GC6714@it.is.rice.edu> References: <10995.1220577198@sss.pgh.pa.us> <11525.1220579153@sss.pgh.pa.us> <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> User-Agent: Mutt/1.5.16 (2007-06-09) X-Virus-Scanned: by amavis-2.2.1 at scan1.mail.rice.edu X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/102 X-Sequence-Number: 7117 On Sat, Sep 06, 2008 at 08:23:05PM -0600, Alex Hunsaker wrote: > On Sat, Sep 6, 2008 at 1:09 PM, Tom Lane wrote: > >For the convenience of anyone intending to test, here is an updated > >patch against CVS HEAD that incorporates Alex's fix. > > Here are the results for a table containing 1 million entries that > will generate hash collisions. It paints a bad picture for the patch > but then again im not sure how relevant the issue is. For example > yesterday I imported a table with 10 million collisions and the create > index is still running (now at about ~18 hours). Maybe we should warn > if there are lots of collisions when creating the index and suggest > you use a btree? Anyway here are the results. > I think that the glacial speed for generating a big hash index is the same problem that the original code faced. Because of the collisions you are unable to achieve the correct packing that the code assumes. This results in the splitting/copying of every page in the hash index, a very slow proposition. I had suggested adding some additional parameters like fillfactor to accomodate these sorts of situations. Since your test cuts the effective fill by 2 because of the many collisions, you would need to adjust that calculation to avoid the tremendous amount of random I/O generated by that mis-assumption. > ./pgbench -c1 -n -t10 -f bench_createindex.sql > cvs head: tps = 0.002169 > v5 : tps = 0.002196 > > pgbench -c1 -n -t1000 -f bench_bitmap.sql > cvs head: tps = 24.011871 > v5: tps = 2.543123 > > pgbench -c1 -n -t1000 -f bench_index.sql > cvs head: tps = 51.614502 > v5: tps = 3.205542 > > pgbench -c1 -n -t1000 -f bench_seqscan.sql > cvs head: tps = 8.553318 > v5: tps = 9.836091 > > Table created via: > create table test_hash (num int8); > ./hash | psql -c 'copy test_hash from stdin;' It would be useful to have an equivalent test for the hash-only index without the modified int8 hash function, since that would be more representative of its performance. The collision rates that I was observing in my tests of the old and new mix() functions was about 2 * (1/10000) of what you test generated. You could just test against the integers between 1 and 2000000. Ken From badalex@gmail.com Wed Sep 10 01:23:08 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 2405A64FF9A for ; Tue, 9 Sep 2008 22:23:08 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 27446-10 for ; Tue, 9 Sep 2008 22:23:05 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from ug-out-1314.google.com (ug-out-1314.google.com [66.249.92.175]) by postgresql.org (Postfix) with ESMTP id 6C79A64FD15 for ; Tue, 9 Sep 2008 22:23:05 -0300 (ADT) Received: by ug-out-1314.google.com with SMTP id 29so351914ugo.7 for ; Tue, 09 Sep 2008 18:23:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=GJfoHdOP+wWYcuuxmbZA6RWsTqouWrH8DhDYMVVJ/38=; b=Jcslll3GDmYl1fDt+hv/5iN9T9z5T8NxprXrFiHOliutA/EceLOHRk7gQIXUSLAT6D crjanfHrScGrt92Qho3mLYA/frtpjL731GKYlBG84JolDxI2l1JvNi1Gv1AtG/0Q+S/Q qM/sFcXGD6Ht3CsJkc8qUHe/z0pu2HaBTEv7w= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=ctMGHyfkWIOe6rnk4m1NfaTwcZMgm6jsLLGG09w5Jo0zR06S41ARjOJ8i58XMkFNhS AYB8GZ4+fcSV/GvMRZdVcuVUVkl0XYs+D9xgPjSwUwbs8NdPvFdLmrKuRqfXniwzjUdg WaVGBhzF54nkdfR88QkxciXEfG8VBsbrvkVBs= Received: by 10.187.162.6 with SMTP id p6mr57572fao.9.1221009783425; Tue, 09 Sep 2008 18:23:03 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Tue, 9 Sep 2008 18:23:03 -0700 (PDT) Message-ID: <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> Date: Tue, 9 Sep 2008 19:23:03 -0600 From: "Alex Hunsaker" To: "Kenneth Marshall" Subject: Re: hash index improving v3 Cc: "Tom Lane" , "Xiao Meng" , "Zdenek Kotala" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <20080909134839.GC6714@it.is.rice.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <10995.1220577198@sss.pgh.pa.us> <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/104 X-Sequence-Number: 7119 On Tue, Sep 9, 2008 at 7:48 AM, Kenneth Marshall wrote: > I think that the glacial speed for generating a big hash index is > the same problem that the original code faced. Yeah sorry, I was not saying it was a new problem with the patch. Err at least not trying to :) *Both* of them had been running at 18+ (I finally killed them sometime Sunday or around +32 hours...) > It would be useful to have an equivalent test for the hash-only > index without the modified int8 hash function, since that would > be more representative of its performance. The collision rates > that I was observing in my tests of the old and new mix() functions > was about 2 * (1/10000) of what you test generated. You could just > test against the integers between 1 and 2000000. Sure but then its pretty much just a general test of patch vs no patch. i.e. How do we measure how much longer collisions take when the new patch makes things faster? That's what I was trying to measure... Though I apologize I don't think that was clearly stated anywhere... Now of course it still would be interesting... And if its only to 2,000,000 I can still use the modified int8 or just use the int4 one... Anyway Here are the numbers: create table test_hash(num int8); insert into test_hash (num) select generate_series(1, 2000000); create index test_hash_num_idx on test_hash (num); pgbench -c1 -n -t10000 -f bench_index.sql cvs head: tps = 3161.500511 v5: tps = 7248.808839 BTW Im still planning on doing a wide vs narrow test... sometime... :) From badalex@gmail.com Wed Sep 10 02:45:16 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 86CAA6500CD for ; Tue, 9 Sep 2008 23:45:16 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 41071-04 for ; Tue, 9 Sep 2008 23:45:13 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from ug-out-1314.google.com (ug-out-1314.google.com [66.249.92.169]) by postgresql.org (Postfix) with ESMTP id E7EC36500C9 for ; Tue, 9 Sep 2008 23:45:12 -0300 (ADT) Received: by ug-out-1314.google.com with SMTP id 29so369165ugo.7 for ; Tue, 09 Sep 2008 19:45:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=IkYcecSA9z9L4nPreOT6hVEV8Hq9dlXPOScJeriwTls=; b=FqUgURAzDeFAQn8La9epcI4eqzU8/eOLln6kWXudZwozwdFFDkjRHC4rYXxHmQFken OB/tcKiHSMMp0IW09+ONmBvPHDIVm7tZbBDD6EEnslgXXLQKSvVdkhEdYrBW0DzHJ1j+ J9hpWCjI4CEuJgIU980FCt4xd8m/iSNAz4aVI= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=rMAD2ukyY3EJPfbezDjC6APCG128ezWQJbkOZU3yCrZ9Ak6Ix4t97hco6l9FwAJd6K OIgx6SRZPCd+xN99P01CQfZPzYYfmNUle07AIH/Afw05BZRqbOXBxrVwDbbv+IyGBqg5 J2ok/dHF/kNcO5phF+eIflDeuN/qvABTqSxyk= Received: by 10.187.203.4 with SMTP id f4mr69133faq.1.1221014710675; Tue, 09 Sep 2008 19:45:10 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Tue, 9 Sep 2008 19:45:10 -0700 (PDT) Message-ID: <34d269d40809091945n2cebde54qe974aeba00986564@mail.gmail.com> Date: Tue, 9 Sep 2008 20:45:10 -0600 From: "Alex Hunsaker" To: "Kenneth Marshall" Subject: Re: hash index improving v3 Cc: "Tom Lane" , "Xiao Meng" , "Zdenek Kotala" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <10995.1220577198@sss.pgh.pa.us> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/105 X-Sequence-Number: 7120 On Tue, Sep 9, 2008 at 7:23 PM, Alex Hunsaker wrote: > create table test_hash(num int8); > insert into test_hash (num) select generate_series(1, 2000000); > create index test_hash_num_idx on test_hash (num); > > pgbench -c1 -n -t10000 -f bench_index.sql > cvs head: tps = 3161.500511 > v5: tps = 7248.808839 Whoa... Ignore those numbers! It would bee nice to actually test with a hash index... and my cvs head atm had cassert on.. sorry about that. create table test_hash(num int8); insert into test_hash (num) select generate_series(1, 2000000); create index test_hash_num_idx on test_hash using hash (num); pgbench -c1 -n -t100000 -f bench_index.sql cvs head: tps = 7345.69432 v5: tps = 7526.290462 From badalex@gmail.com Wed Sep 10 03:05:10 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 4950864FCF3 for ; Wed, 10 Sep 2008 00:05:10 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 46031-08 for ; Wed, 10 Sep 2008 00:05:00 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from ug-out-1314.google.com (ug-out-1314.google.com [66.249.92.173]) by postgresql.org (Postfix) with ESMTP id C7B4B64FCC4 for ; Wed, 10 Sep 2008 00:04:59 -0300 (ADT) Received: by ug-out-1314.google.com with SMTP id 29so373515ugo.7 for ; Tue, 09 Sep 2008 20:04:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type:references; bh=ufyuCoPuZO5mGgMgtKjZcOS5ZjfrpxZ9E2KQJS8sMTk=; b=u8HWHPa47ysOOTSHqzT5OMrBOkB2Ot1s4NxATLGfUIevdN0uikTOiPFw7MG8yU0x/v TQkUEBf/WdaeeBa/nydbOwIEJBJRBz8ELH7B3z4QAB0fUQxq5AFInsbc1IPCK7EBZR5Q +NKJGfSg1CrYQ85pdbZMPKUIA9TqxnbnplcyI= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:references; b=Pfus/7xnb1aZTAnHucWvm3sAwIjp63glkYRjAFiSkTZYD5Zl1bppn5eflJgNb0ZTsj RKhE6cqgwvEigwrbqVvH4mXhsNunY7rB6xR/yKPDXDMdz+Zv4qkC/FqtY/tn1ES7P9kd J2V9T8w/RbQehMPFVbAF9vIYPG1hfB5+mSUOE= Received: by 10.187.161.10 with SMTP id n10mr64453fao.43.1221015898084; Tue, 09 Sep 2008 20:04:58 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Tue, 9 Sep 2008 20:04:58 -0700 (PDT) Message-ID: <34d269d40809092004q10b5da87r6fa3fe86926476ff@mail.gmail.com> Date: Tue, 9 Sep 2008 21:04:58 -0600 From: "Alex Hunsaker" To: "Tom Lane" Subject: Re: hash index improving v3 Cc: "Xiao Meng" , "Zdenek Kotala" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_3050_15884634.1221015898101" References: <10995.1220577198@sss.pgh.pa.us> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/106 X-Sequence-Number: 7121 ------=_Part_3050_15884634.1221015898101 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline On Tue, Sep 9, 2008 at 7:23 PM, Alex Hunsaker wrote: > BTW Im still planning on doing a wide vs narrow test... sometime... :) narrow: (exactly the same as what I just did in the other post) create table test_hash(num int8); insert into test_hash (num) select generate_series(1, 2000000); create index test_hash_num_idx on test_hash using hash (num); pgbench -c1 -n -t100000 -f bench_index.sql cvs head: tps = 7345.69432 v5: tps = 7526.290462 wide: # NOTE not on the same machine as the "narrow" test was run! # spit out 2, 000, 000 random 100 length strings perl gen.pl > data.sql create table test_hash (wide text); copy test_hash from './data.sql'; create index test_hash_num_idx on test_hash using hash (wide); bench.sql: select a.wide from test_hash as a inner join test_hash as b on b.wide = a.wide where a.wide = 'BJNORSLMITGKHJCWDBLKLYRSJTVPTYXZJPWNBKXGHYFNDHRAKNFMDHRMUXLDXNTRBJMTHPGPBFJZPAENZXDHAHCUSCJTUPUXWCXUH'; # ^ that string is in data.sql # 3 runs each pgbench -c1 -n -t100000 -f bench.sql cvs head: tps = 5073.463498, 5110.620923, 4955.347610 v5: tps = 5870.681336, 5740.007837, 5699.002942 ------=_Part_3050_15884634.1221015898101 Content-Type: application/x-perl; name=gen.pl Content-Transfer-Encoding: base64 X-Attachment-Id: f_fkxd67aj0 Content-Disposition: attachment; filename=gen.pl dXNlIHN0cmljdDsKdXNlIHdhcm5pbmdzOwoKbXkgQGNoYXJzID0gJ0EnLi4nWic7Cgpmb3IgbXkg JHggKDAuLjIwMDAwMDApCnsKCW15ICRzdHIgPSAnJyB4IDEwMDsKCglmb3IgbXkgJHkgKDAuLjEw MCkKCXsKCQkkc3RyIC49ICRjaGFyc1tyYW5kIEBjaGFyc107Cgl9CgoJcHJpbnQgIiRzdHJcbiI7 Cn0K ------=_Part_3050_15884634.1221015898101-- From ktm@rice.edu Wed Sep 10 13:04:12 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 6907C64FCD5 for ; Wed, 10 Sep 2008 10:04:12 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 58220-04 for ; Wed, 10 Sep 2008 10:04:05 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from is.rice.edu (is.rice.edu [128.42.42.24]) by postgresql.org (Postfix) with ESMTP id 9AC7364FCCB for ; Wed, 10 Sep 2008 10:04:05 -0300 (ADT) Received: from scan1.mail.rice.edu (scan1.mail.rice.edu [128.42.58.160]) by is.rice.edu (Postfix) with ESMTP id E13A241820; Wed, 10 Sep 2008 08:04:02 -0500 (CDT) Received: from is.rice.edu ([128.42.42.24]) by scan1.mail.rice.edu (scan1.mail.rice.edu [128.42.58.160]) (amavisd-new, port 10024) with ESMTP id 29955-01; Wed, 10 Sep 2008 08:04:02 -0500 (CDT) Received: by is.rice.edu (Postfix, from userid 18612) id 2B4EC4181D; Wed, 10 Sep 2008 08:04:02 -0500 (CDT) Date: Wed, 10 Sep 2008 08:04:01 -0500 From: Kenneth Marshall To: Alex Hunsaker Cc: Tom Lane , Xiao Meng , Zdenek Kotala , pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: Re: hash index improving v3 Message-ID: <20080910130401.GG6714@it.is.rice.edu> References: <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> User-Agent: Mutt/1.5.16 (2007-06-09) X-Virus-Scanned: by amavis-2.2.1 at scan1.mail.rice.edu X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/107 X-Sequence-Number: 7122 On Tue, Sep 09, 2008 at 07:23:03PM -0600, Alex Hunsaker wrote: > On Tue, Sep 9, 2008 at 7:48 AM, Kenneth Marshall wrote: > > I think that the glacial speed for generating a big hash index is > > the same problem that the original code faced. > > Yeah sorry, I was not saying it was a new problem with the patch. Err > at least not trying to :) *Both* of them had been running at 18+ (I > finally killed them sometime Sunday or around +32 hours...) > > > It would be useful to have an equivalent test for the hash-only > > index without the modified int8 hash function, since that would > > be more representative of its performance. The collision rates > > that I was observing in my tests of the old and new mix() functions > > was about 2 * (1/10000) of what you test generated. You could just > > test against the integers between 1 and 2000000. > > Sure but then its pretty much just a general test of patch vs no > patch. i.e. How do we measure how much longer collisions take when > the new patch makes things faster? That's what I was trying to > measure... Though I apologize I don't think that was clearly stated > anywhere... Right, I agree that we need to benchmark the collision processing time difference. I am not certain that two data points is useful information. There are 469 collisions with our current hash function on the integers from 1 to 2000000. What about testing the performance at power-of-2 multiples of 500, i.e. 500, 1000, 2000, 4000, 8000,... Unless you adjust the fill calculation for the CREATE INDEX, I would stop once the time to create the index spikes. It might also be useful to see if a CLUSTER affects the performance as well. What do you think of that strategy? Regards, Ken > Now of course it still would be interesting... And if its only to > 2,000,000 I can still use the modified int8 or just use the int4 > one... > > Anyway Here are the numbers: > create table test_hash(num int8); > insert into test_hash (num) select generate_series(1, 2000000); > create index test_hash_num_idx on test_hash (num); > > pgbench -c1 -n -t10000 -f bench_index.sql > cvs head: tps = 3161.500511 > v5: tps = 7248.808839 > > BTW Im still planning on doing a wide vs narrow test... sometime... :) > From Zdenek.Kotala@Sun.COM Wed Sep 10 14:47:07 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 1A57C6500CD for ; Wed, 10 Sep 2008 11:47:07 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 85224-03-3 for ; Wed, 10 Sep 2008 11:46:57 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from gmp-eb-inf-1.sun.com (gmp-eb-inf-1.sun.com [192.18.6.21]) by postgresql.org (Postfix) with ESMTP id D51DC64FCC4 for ; Wed, 10 Sep 2008 11:46:52 -0300 (ADT) Received: from fe-emea-10.sun.com (gmp-eb-lb-2-fe3.eu.sun.com [192.18.6.12]) by gmp-eb-inf-1.sun.com (8.13.7+Sun/8.12.9) with ESMTP id m8AEklFk011812 for ; Wed, 10 Sep 2008 14:46:47 GMT Received: from conversion-daemon.fe-emea-10.sun.com by fe-emea-10.sun.com (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) id <0K6Z00G01HPLAS00@fe-emea-10.sun.com> (original mail from Zdenek.Kotala@Sun.COM) for pgsql-patches@postgresql.org; Wed, 10 Sep 2008 15:46:47 +0100 (BST) Received: from [129.157.18.76] by fe-emea-10.sun.com (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) with ESMTPSA id <0K6Z0094EIDINP30@fe-emea-10.sun.com>; Wed, 10 Sep 2008 15:46:30 +0100 (BST) Date: Wed, 10 Sep 2008 16:47:21 +0200 From: Zdenek Kotala Subject: Re: hash index improving v3 In-reply-to: <34d269d40809092004q10b5da87r6fa3fe86926476ff@mail.gmail.com> To: Alex Hunsaker Cc: Tom Lane , Xiao Meng , pgsql-patches@postgresql.org, "Jonah H. Harris" Message-id: <48C7DDF9.6020507@sun.com> MIME-version: 1.0 Content-type: text/plain; format=flowed; charset=ISO-8859-2 Content-transfer-encoding: 7BIT References: <10995.1220577198@sss.pgh.pa.us> <11962.1220581027@sss.pgh.pa.us> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <34d269d40809092004q10b5da87r6fa3fe86926476ff@mail.gmail.com> User-Agent: Thunderbird 2.0.0.14 (X11/20080630) X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200809/108 X-Sequence-Number: 7123 Alex Hunsaker napsal(a): > > wide: > # NOTE not on the same machine as the "narrow" test was run! > > # spit out 2, 000, 000 random 100 length strings > perl gen.pl > data.sql > create table test_hash (wide text); > copy test_hash from './data.sql'; > create index test_hash_num_idx on test_hash using hash (wide); > > bench.sql: > select a.wide from test_hash as a inner join test_hash as b on b.wide > = a.wide where a.wide = > 'BJNORSLMITGKHJCWDBLKLYRSJTVPTYXZJPWNBKXGHYFNDHRAKNFMDHRMUXLDXNTRBJMTHPGPBFJZPAENZXDHAHCUSCJTUPUXWCXUH'; > > # ^ that string is in data.sql > > # 3 runs each > pgbench -c1 -n -t100000 -f bench.sql > cvs head: tps = 5073.463498, 5110.620923, 4955.347610 > v5: tps = 5870.681336, 5740.007837, 5699.002942 What locale did you use? It would be nice to have also comparing between C and any UTF8 locale. I think we should see big benefit when non C locale is used. Thanks Zdenek From badalex@gmail.com Wed Sep 10 16:27:35 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 8F1F364FCFD for ; Wed, 10 Sep 2008 13:27:35 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 08668-08 for ; Wed, 10 Sep 2008 13:27:26 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from yx-out-2324.google.com (yx-out-2324.google.com [74.125.44.29]) by postgresql.org (Postfix) with ESMTP id A857464FCF3 for ; Wed, 10 Sep 2008 13:27:26 -0300 (ADT) Received: by yx-out-2324.google.com with SMTP id 8so1420037yxb.73 for ; Wed, 10 Sep 2008 09:27:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=YtuI1QFIsE59/EKqWaE302KZ7X/7WqlVJEqYbXJQuSU=; b=VQpKl5Wn4KunongdANwykm4IIH+yV1V717Z19NNtIbbo6bzwDv8c0ChARI+xmkleGj 1CfUa941jxCEvOuYCjwnFFwbTAhBjm5mJVbPY9Pi+EXs7B9i6ag66xpRyOdUfFuJV0cO bO4voshLy6lqJAdpIsGs3JBT/niLmo67ywjpM= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=Df4XEQ9YTHdj66PLZ4xoJH1G/6DfFF/22sWXk7lHPLwpquef6ghHEFRUHJgENzX1KE nbGxBGbrpq+PaX1fllveI2r/ykU8HiVYWN866p0aLnlwPirJHZOA1e1DfGuUeqKW4FO/ eDaI7bMqyz24gntbejq0b/24cS9ziqcIUVxgg= Received: by 10.187.168.15 with SMTP id v15mr157683fao.100.1221064044438; Wed, 10 Sep 2008 09:27:24 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Wed, 10 Sep 2008 09:27:24 -0700 (PDT) Message-ID: <34d269d40809100927n20864e41p65c068c4ec6f6d74@mail.gmail.com> Date: Wed, 10 Sep 2008 10:27:24 -0600 From: "Alex Hunsaker" To: "Zdenek Kotala" Subject: Re: hash index improving v3 Cc: "Tom Lane" , "Xiao Meng" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <48C7DDF9.6020507@sun.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <10995.1220577198@sss.pgh.pa.us> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <34d269d40809092004q10b5da87r6fa3fe86926476ff@mail.gmail.com> <48C7DDF9.6020507@sun.com> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/110 X-Sequence-Number: 7125 On Wed, Sep 10, 2008 at 8:47 AM, Zdenek Kotala wrote: > What locale did you use? It would be nice to have also comparing between C > and any UTF8 locale. I think we should see big benefit when non C locale is > used. Err yes this was UTF8, Ill see about doing a C locale. From badalex@gmail.com Thu Sep 11 03:45:31 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 00B5864FD04 for ; Thu, 11 Sep 2008 00:45:31 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 21943-08 for ; Thu, 11 Sep 2008 00:45:26 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from ug-out-1314.google.com (ug-out-1314.google.com [66.249.92.172]) by postgresql.org (Postfix) with ESMTP id 4F88364FCFD for ; Thu, 11 Sep 2008 00:45:26 -0300 (ADT) Received: by ug-out-1314.google.com with SMTP id 29so703065ugo.7 for ; Wed, 10 Sep 2008 20:45:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=hNpt2AZQIiwW5qjAN6VhPKYzJBRfTQGqind8rmV3+fg=; b=FpnhMUzt/DcTHZVISgmx19IWf9u8HAWpBeRyqO7OmtzmguuCyBhdG2znwOA7a6TDoT Jk++N9mLCxYaOvcGTkNrppwwSlxsnn+0AjONZbQNWowQS+36Mzpt7w/kZcaLe3KDMShX 8ulottklMu3Ic/s2EIlxtmPMP49wT28iyV7rk= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=vLQKl64E8Zqw2EXK+jhuqR6B3eblWjg6Ql4Zf24D+wE1qioSxZ3ZGOA/PSApftqil+ U8NFgserMpcXJ0JJhKwmzapPqDiTdXhFjZBHGHPmmuOqSQ/5M7S/Zd7tpajfyjoIxL9K qde9m+Ogoomk68fFgaMrg5DsJfT4csJnS8ybk= Received: by 10.187.168.15 with SMTP id v15mr248057fao.100.1221104724532; Wed, 10 Sep 2008 20:45:24 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Wed, 10 Sep 2008 20:45:24 -0700 (PDT) Message-ID: <34d269d40809102045t2f8037a4jfe862264f6f04454@mail.gmail.com> Date: Wed, 10 Sep 2008 21:45:24 -0600 From: "Alex Hunsaker" To: "Zdenek Kotala" Subject: Re: hash index improving v3 Cc: "Tom Lane" , "Xiao Meng" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <34d269d40809100927n20864e41p65c068c4ec6f6d74@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <10995.1220577198@sss.pgh.pa.us> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <34d269d40809092004q10b5da87r6fa3fe86926476ff@mail.gmail.com> <48C7DDF9.6020507@sun.com> <34d269d40809100927n20864e41p65c068c4ec6f6d74@mail.gmail.com> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/112 X-Sequence-Number: 7127 On Wed, Sep 10, 2008 at 10:27 AM, Alex Hunsaker wrote: > On Wed, Sep 10, 2008 at 8:47 AM, Zdenek Kotala wrote: >> What locale did you use? It would be nice to have also comparing between C >> and any UTF8 locale. I think we should see big benefit when non C locale is >> used. > > Err yes this was UTF8, Ill see about doing a C locale. > And here it with a C locale: pgbench -c1 -n -t100000 -f bench.sql cvs head: tps = 5142.784262 v5: tps = 6169.405965 and just for fun a the same using a btree index pgbench -c1 -n -t100000 -f bench.sql cvs head: tps = 5234.680407 v5: tps = 5286.08252 From badalex@gmail.com Thu Sep 11 03:49:30 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id B553E64FD02 for ; Thu, 11 Sep 2008 00:49:30 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 24981-01 for ; Thu, 11 Sep 2008 00:49:27 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from ug-out-1314.google.com (ug-out-1314.google.com [66.249.92.169]) by postgresql.org (Postfix) with ESMTP id 76D5664FD05 for ; Thu, 11 Sep 2008 00:49:27 -0300 (ADT) Received: by ug-out-1314.google.com with SMTP id 29so703861ugo.7 for ; Wed, 10 Sep 2008 20:49:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=sxqprjJXd0rkjE+k0RQkoxM8NmOzGjsybeH64cWCQWs=; b=T0vOBV2fejw14DbzSQGjHBMvPzD1wdb4yxqark+0FAscoHtYW8Wxx4uo16CZxLFwHQ sqsnDU9+58sAKgyFsISVd/2Z5AOC6s1GNEVwimW3aKH1J/4tHRu0obYMBCEiiqHdF8bW 8kDQzKiZsqy/inxsXLdi+JRXmcX4rHopO+UmE= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=UNK+kgaCpJLMT736v/1ST3xYzyd9V1rJ3jyyEAY642f0hsfshnfYK8XdS+uCe/93Zs bu2WGOq+TQIXCwQ/LS1psU7ZM++j3WSjr7pRUl3pxUpqlkq2qHFS4D5LkZhE6BLH6WR8 GLNSgVyZ4PprUvQU1Uk4C0m41o9EXJwMbPoMM= Received: by 10.187.201.4 with SMTP id d4mr259875faq.17.1221104966109; Wed, 10 Sep 2008 20:49:26 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Wed, 10 Sep 2008 20:49:25 -0700 (PDT) Message-ID: <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> Date: Wed, 10 Sep 2008 21:49:25 -0600 From: "Alex Hunsaker" To: "Kenneth Marshall" Subject: Re: hash index improving v3 Cc: "Tom Lane" , "Xiao Meng" , "Zdenek Kotala" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <20080910130401.GG6714@it.is.rice.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <34d269d40809042048m3b532a5ej7a9588f63a788d0c@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/113 X-Sequence-Number: 7128 On Wed, Sep 10, 2008 at 7:04 AM, Kenneth Marshall wrote: > On Tue, Sep 09, 2008 at 07:23:03PM -0600, Alex Hunsaker wrote: >> On Tue, Sep 9, 2008 at 7:48 AM, Kenneth Marshall wrote: >> > I think that the glacial speed for generating a big hash index is >> > the same problem that the original code faced. >> >> Yeah sorry, I was not saying it was a new problem with the patch. Err >> at least not trying to :) *Both* of them had been running at 18+ (I >> finally killed them sometime Sunday or around +32 hours...) >> >> > It would be useful to have an equivalent test for the hash-only >> > index without the modified int8 hash function, since that would >> > be more representative of its performance. The collision rates >> > that I was observing in my tests of the old and new mix() functions >> > was about 2 * (1/10000) of what you test generated. You could just >> > test against the integers between 1 and 2000000. >> >> Sure but then its pretty much just a general test of patch vs no >> patch. i.e. How do we measure how much longer collisions take when >> the new patch makes things faster? That's what I was trying to >> measure... Though I apologize I don't think that was clearly stated >> anywhere... > > Right, I agree that we need to benchmark the collision processing > time difference. I am not certain that two data points is useful > information. There are 469 collisions with our current hash function > on the integers from 1 to 2000000. What about testing the performance > at power-of-2 multiples of 500, i.e. 500, 1000, 2000, 4000, 8000,... > Unless you adjust the fill calculation for the CREATE INDEX, I would > stop once the time to create the index spikes. It might also be useful > to see if a CLUSTER affects the performance as well. What do you think > of that strategy? Not sure it will be a good benchmark of collision processing. Then again you seem to have studied the hash algo closer than me. Ill go see about doing this. Stay tuned. From badalex@gmail.com Thu Sep 11 04:24:30 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 810B464FCFD for ; Thu, 11 Sep 2008 01:24:30 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 64019-04-2 for ; Thu, 11 Sep 2008 01:24:23 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from nf-out-0910.google.com (nf-out-0910.google.com [64.233.182.185]) by postgresql.org (Postfix) with ESMTP id 308D664FD02 for ; Thu, 11 Sep 2008 01:17:33 -0300 (ADT) Received: by nf-out-0910.google.com with SMTP id c7so95998nfi.23 for ; Wed, 10 Sep 2008 21:17:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=SmeWLSUkxa8x3e5OUrY6qTBJ0PZIgemgkBsPNBgHK6E=; b=jUsJAkD9OD912Zo81y53RiK3q6x8mbUwwuYw0HWXaxd23q2/RIl9TVsD0BC9EXj/7J hjYB0pv08+geIun0uhBO/6G7gtuV5FDaYI5EwGs2lM7+kCxU4hBmsj/HUnEcr3uEs3d4 0rWPiVaXkx/3gizjidFczpGN/m0vk9djDF4Qg= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=Grin6uXrakIOu8O+CJbJ2ZERYaMtqXh6w1xcRa0YFkNnqpeShw4XkiH6/hwdoCvyFa qyIpvjGLCPZhTd1Z9atFfYZnYpdm7N5EBJgL3dlUEiKVdBqbQRooldThmpzGr+m87IB7 Ut/sdjxH6gkZCkUZPBoPNwX5HRJrOgPZ2Pe20= Received: by 10.187.195.7 with SMTP id x7mr258816fap.46.1221106652029; Wed, 10 Sep 2008 21:17:32 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Wed, 10 Sep 2008 21:17:31 -0700 (PDT) Message-ID: <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> Date: Wed, 10 Sep 2008 22:17:31 -0600 From: "Alex Hunsaker" To: "Kenneth Marshall" Subject: Re: hash index improving v3 Cc: "Tom Lane" , "Xiao Meng" , "Zdenek Kotala" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/114 X-Sequence-Number: 7129 On Wed, Sep 10, 2008 at 9:49 PM, Alex Hunsaker wrote: > On Wed, Sep 10, 2008 at 7:04 AM, Kenneth Marshall wrote: >> On Tue, Sep 09, 2008 at 07:23:03PM -0600, Alex Hunsaker wrote: >>> On Tue, Sep 9, 2008 at 7:48 AM, Kenneth Marshall wrote: >>> > I think that the glacial speed for generating a big hash index is >>> > the same problem that the original code faced. >>> >>> Yeah sorry, I was not saying it was a new problem with the patch. Err >>> at least not trying to :) *Both* of them had been running at 18+ (I >>> finally killed them sometime Sunday or around +32 hours...) >>> >>> > It would be useful to have an equivalent test for the hash-only >>> > index without the modified int8 hash function, since that would >>> > be more representative of its performance. The collision rates >>> > that I was observing in my tests of the old and new mix() functions >>> > was about 2 * (1/10000) of what you test generated. You could just >>> > test against the integers between 1 and 2000000. >>> >>> Sure but then its pretty much just a general test of patch vs no >>> patch. i.e. How do we measure how much longer collisions take when >>> the new patch makes things faster? That's what I was trying to >>> measure... Though I apologize I don't think that was clearly stated >>> anywhere... >> >> Right, I agree that we need to benchmark the collision processing >> time difference. I am not certain that two data points is useful >> information. There are 469 collisions with our current hash function >> on the integers from 1 to 2000000. What about testing the performance >> at power-of-2 multiples of 500, i.e. 500, 1000, 2000, 4000, 8000,... >> Unless you adjust the fill calculation for the CREATE INDEX, I would >> stop once the time to create the index spikes. It might also be useful >> to see if a CLUSTER affects the performance as well. What do you think >> of that strategy? > > Not sure it will be a good benchmark of collision processing. Then > again you seem to have studied the hash algo closer than me. Ill go > see about doing this. Stay tuned. Assuming I understood you correctly, And I probably didn't this does not work very well because you max out at 27,006 values before you get this error: ERROR: index row size 8152 exceeds hash maximum 8144 HINT: Values larger than a buffer page cannot be indexed. So is a power-of-2 multiple of 500 not simply: x = 500; while(1) { print x; x *= 2; } ? From ktm@rice.edu Thu Sep 11 15:25:35 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id F3624650040 for ; Thu, 11 Sep 2008 12:25:35 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 52564-03-8 for ; Thu, 11 Sep 2008 12:25:32 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from is.rice.edu (is.rice.edu [128.42.42.24]) by postgresql.org (Postfix) with ESMTP id E4A3F650186 for ; Thu, 11 Sep 2008 12:24:42 -0300 (ADT) Received: from scan1.mail.rice.edu (scan1.mail.rice.edu [128.42.58.160]) by is.rice.edu (Postfix) with ESMTP id 5A09A4182E; Thu, 11 Sep 2008 10:24:39 -0500 (CDT) Received: from is.rice.edu ([128.42.42.24]) by scan1.mail.rice.edu (scan1.mail.rice.edu [128.42.58.160]) (amavisd-new, port 10024) with ESMTP id 09322-05; Thu, 11 Sep 2008 10:24:38 -0500 (CDT) Received: by is.rice.edu (Postfix, from userid 18612) id 8CEDD41820; Thu, 11 Sep 2008 10:24:38 -0500 (CDT) Date: Thu, 11 Sep 2008 10:24:38 -0500 From: Kenneth Marshall To: Alex Hunsaker Cc: Tom Lane , Xiao Meng , Zdenek Kotala , pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: Re: hash index improving v3 Message-ID: <20080911152437.GM6714@it.is.rice.edu> References: <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> User-Agent: Mutt/1.5.16 (2007-06-09) X-Virus-Scanned: by amavis-2.2.1 at scan1.mail.rice.edu X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/116 X-Sequence-Number: 7131 On Wed, Sep 10, 2008 at 10:17:31PM -0600, Alex Hunsaker wrote: > On Wed, Sep 10, 2008 at 9:49 PM, Alex Hunsaker wrote: > > On Wed, Sep 10, 2008 at 7:04 AM, Kenneth Marshall wrote: > >> On Tue, Sep 09, 2008 at 07:23:03PM -0600, Alex Hunsaker wrote: > >>> On Tue, Sep 9, 2008 at 7:48 AM, Kenneth Marshall wrote: > >>> > I think that the glacial speed for generating a big hash index is > >>> > the same problem that the original code faced. > >>> > >>> Yeah sorry, I was not saying it was a new problem with the patch. Err > >>> at least not trying to :) *Both* of them had been running at 18+ (I > >>> finally killed them sometime Sunday or around +32 hours...) > >>> > >>> > It would be useful to have an equivalent test for the hash-only > >>> > index without the modified int8 hash function, since that would > >>> > be more representative of its performance. The collision rates > >>> > that I was observing in my tests of the old and new mix() functions > >>> > was about 2 * (1/10000) of what you test generated. You could just > >>> > test against the integers between 1 and 2000000. > >>> > >>> Sure but then its pretty much just a general test of patch vs no > >>> patch. i.e. How do we measure how much longer collisions take when > >>> the new patch makes things faster? That's what I was trying to > >>> measure... Though I apologize I don't think that was clearly stated > >>> anywhere... > >> > >> Right, I agree that we need to benchmark the collision processing > >> time difference. I am not certain that two data points is useful > >> information. There are 469 collisions with our current hash function > >> on the integers from 1 to 2000000. What about testing the performance > >> at power-of-2 multiples of 500, i.e. 500, 1000, 2000, 4000, 8000,... > >> Unless you adjust the fill calculation for the CREATE INDEX, I would > >> stop once the time to create the index spikes. It might also be useful > >> to see if a CLUSTER affects the performance as well. What do you think > >> of that strategy? > > > > Not sure it will be a good benchmark of collision processing. Then > > again you seem to have studied the hash algo closer than me. Ill go > > see about doing this. Stay tuned. > > Assuming I understood you correctly, And I probably didn't this does > not work very well because you max out at 27,006 values before you get > this error: > ERROR: index row size 8152 exceeds hash maximum 8144 > HINT: Values larger than a buffer page cannot be indexed. > > So is a power-of-2 multiple of 500 not simply: > x = 500; > while(1) > { > print x; > x *= 2; > } > > ? > Alex, I meant to check the performance with increasing numbers of collisions, not increasing size of the hashed item. In other words, something like this: for ($coll=500; $i<=1000000; $i=$i*2) { for ($i=0; $i<=1000000; $i++) { hash(int8 $i); } # add the appropriate number of collisions, distributed evenly to # minimize the packing overrun problem for ($dup=0; $dup<=$coll; $dup++) { hash(int8 MAX_INT + $dup * 1000000/$coll); } } Ken From badalex@gmail.com Fri Sep 12 02:51:58 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 3459064FEDF for ; Thu, 11 Sep 2008 23:51:58 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 01367-04 for ; Thu, 11 Sep 2008 23:51:55 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.159]) by postgresql.org (Postfix) with ESMTP id B903B64FCD6 for ; Thu, 11 Sep 2008 23:51:55 -0300 (ADT) Received: by fg-out-1718.google.com with SMTP id 16so386836fgg.23 for ; Thu, 11 Sep 2008 19:51:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=5PeMjkHATsf7d8AYsccZ06deN7/ppq1dvjHx4N7K/Fw=; b=Jh5HZC7yTpwrb/aNUCE3LZEtBRR4GaV+Syu2xDNMCUOiUgZuQb60w9K8WFSVZ7CJLT lCNXaaG3NMTuGcod4Ji7vWvzLtjHVsFpxR04uRPOH5PRJi3SDlYy21vD85wSdcaDpd7p KKNusauukWiEfbhqLK1C9tmr0DJA8twWmitIg= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=LeDiOzZKjq/99fKylgM/0FcDZppHyJ7xMWjf6ejOGoMtGg44vTyMCKtzzE+maTf/US Aj1RyGTKjyU0uflp4CR7crNotILvRQ1M7Tz0fHH0hIVeVksuBpxyrWmYTkxXCdDCU4Tf A1pAIRSST6hO9izfo6TSxFPvEp68qu04HlVRM= Received: by 10.187.247.15 with SMTP id z15mr495761far.80.1221187913711; Thu, 11 Sep 2008 19:51:53 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Thu, 11 Sep 2008 19:51:53 -0700 (PDT) Message-ID: <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> Date: Thu, 11 Sep 2008 20:51:53 -0600 From: "Alex Hunsaker" To: "Kenneth Marshall" Subject: Re: hash index improving v3 Cc: "Tom Lane" , "Xiao Meng" , "Zdenek Kotala" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <20080911152437.GM6714@it.is.rice.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <34d269d40809050912u33f2afc8mb90e316bc465136e@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> <20080911152437.GM6714@it.is.rice.edu> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/117 X-Sequence-Number: 7132 On Thu, Sep 11, 2008 at 9:24 AM, Kenneth Marshall wrote: > Alex, > > I meant to check the performance with increasing numbers of collisions, > not increasing size of the hashed item. In other words, something like > this: > > for ($coll=500; $i<=1000000; $i=$i*2) { > for ($i=0; $i<=1000000; $i++) { > hash(int8 $i); > } > # add the appropriate number of collisions, distributed evenly to > # minimize the packing overrun problem > for ($dup=0; $dup<=$coll; $dup++) { > hash(int8 MAX_INT + $dup * 1000000/$coll); > } > } > > Ken *doh* right something like this... create or replace function create_test_hash() returns bool as $$ declare coll integer default 500; -- tweak this to where create index gets really slow max_coll integer default 1000000; begin loop execute 'create table test_hash_'|| coll ||'(num int8);'; execute 'insert into test_hash_'|| coll ||' (num) select n from generate_series(0, '|| max_coll ||') as n;'; execute 'insert into test_hash_'|| coll ||' (num) select (n+4294967296) * '|| max_col ||'/'|| coll ||'::int from generate_series(0, '|| coll ||') as n;'; coll := coll * 2; exit when coll >= max_coll; end loop; return true; end; $$ language 'plpgsql'; And then benchmark each table, and for extra credit cluster the table on the index and benchmark that. Also obviously with the hashint8 which just ignores the top 32 bits. Right? From Zdenek.Kotala@Sun.COM Fri Sep 12 09:15:34 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 0560364FCBD for ; Fri, 12 Sep 2008 06:15:34 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 68451-08 for ; Fri, 12 Sep 2008 06:15:26 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from gmp-eb-inf-1.sun.com (gmp-eb-inf-1.sun.com [192.18.6.21]) by postgresql.org (Postfix) with ESMTP id EC35A64FCD2 for ; Fri, 12 Sep 2008 06:15:22 -0300 (ADT) Received: from fe-emea-09.sun.com (gmp-eb-lb-2-fe2.eu.sun.com [192.18.6.11]) by gmp-eb-inf-1.sun.com (8.13.7+Sun/8.12.9) with ESMTP id m8C9FJng006468 for ; Fri, 12 Sep 2008 09:15:19 GMT Received: from conversion-daemon.fe-emea-09.sun.com by fe-emea-09.sun.com (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) id <0K7200301S1AGY00@fe-emea-09.sun.com> (original mail from Zdenek.Kotala@Sun.COM) for pgsql-patches@postgresql.org; Fri, 12 Sep 2008 10:15:19 +0100 (BST) Received: from [192.168.1.101] ([89.102.161.149]) by fe-emea-09.sun.com (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) with ESMTPSA id <0K7200CR3SD224C0@fe-emea-09.sun.com>; Fri, 12 Sep 2008 10:15:03 +0100 (BST) Date: Fri, 12 Sep 2008 11:14:58 +0200 From: Zdenek Kotala Subject: Re: hash index improving v3 In-reply-to: <34d269d40809102045t2f8037a4jfe862264f6f04454@mail.gmail.com> To: Alex Hunsaker Cc: Tom Lane , Xiao Meng , pgsql-patches@postgresql.org, "Jonah H. Harris" Message-id: <48CA3312.1040508@sun.com> MIME-version: 1.0 Content-type: text/plain; format=flowed; charset=ISO-8859-1 Content-transfer-encoding: 7BIT References: <10995.1220577198@sss.pgh.pa.us> <34d269d40809051321w2ed16037od0373a4a29c311f1@mail.gmail.com> <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <34d269d40809092004q10b5da87r6fa3fe86926476ff@mail.gmail.com> <48C7DDF9.6020507@sun.com> <34d269d40809100927n20864e41p65c068c4ec6f6d74@mail.gmail.com> <34d269d40809102045t2f8037a4jfe862264f6f04454@mail.gmail.com> User-Agent: Thunderbird 2.0.0.16 (X11/20080811) X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200809/118 X-Sequence-Number: 7133 Alex Hunsaker napsal(a): > On Wed, Sep 10, 2008 at 10:27 AM, Alex Hunsaker wrote: >> On Wed, Sep 10, 2008 at 8:47 AM, Zdenek Kotala wrote: >>> What locale did you use? It would be nice to have also comparing between C >>> and any UTF8 locale. I think we should see big benefit when non C locale is >>> used. >> Err yes this was UTF8, Ill see about doing a C locale. >> > > And here it with a C locale: > > pgbench -c1 -n -t100000 -f bench.sql > cvs head: tps = 5142.784262 > v5: tps = 6169.405965 If I look on both results C UTF8 difference ----------------------------------- cvs head: 5140 5050 -2% v5: 6170 5750 -7% improvement: 20% 14% than I little bit wonder. I personally expected bigger difference of UTF8 comparing between CVS a v5. This test also shows that locale selection has bigger impact on performance in v5 case, but result is still better than cvs head. Zdenek -- Zdenek Kotala Sun Microsystems Prague, Czech Republic http://sun.com/postgresql From ktm@rice.edu Fri Sep 12 14:29:28 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 55BFF64FCD2 for ; Fri, 12 Sep 2008 11:29:28 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 36304-06 for ; Fri, 12 Sep 2008 11:29:25 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from is.rice.edu (is.rice.edu [128.42.42.24]) by postgresql.org (Postfix) with ESMTP id B988B64FCCC for ; Fri, 12 Sep 2008 11:29:25 -0300 (ADT) Received: from scan1.mail.rice.edu (scan1.mail.rice.edu [128.42.58.160]) by is.rice.edu (Postfix) with ESMTP id 2A5A04182B; Fri, 12 Sep 2008 09:29:22 -0500 (CDT) Received: from is.rice.edu ([128.42.42.24]) by scan1.mail.rice.edu (scan1.mail.rice.edu [128.42.58.160]) (amavisd-new, port 10024) with ESMTP id 24495-07; Fri, 12 Sep 2008 09:29:21 -0500 (CDT) Received: by is.rice.edu (Postfix, from userid 18612) id 6ACEC41820; Fri, 12 Sep 2008 09:29:21 -0500 (CDT) Date: Fri, 12 Sep 2008 09:29:21 -0500 From: Kenneth Marshall To: Alex Hunsaker Cc: Tom Lane , Xiao Meng , Zdenek Kotala , pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: Re: hash index improving v3 Message-ID: <20080912142921.GB26773@it.is.rice.edu> References: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> <20080911152437.GM6714@it.is.rice.edu> <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> User-Agent: Mutt/1.5.16 (2007-06-09) X-Virus-Scanned: by amavis-2.2.1 at scan1.mail.rice.edu X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/119 X-Sequence-Number: 7134 On Thu, Sep 11, 2008 at 08:51:53PM -0600, Alex Hunsaker wrote: > On Thu, Sep 11, 2008 at 9:24 AM, Kenneth Marshall wrote: > > Alex, > > > > I meant to check the performance with increasing numbers of collisions, > > not increasing size of the hashed item. In other words, something like > > this: > > > > for ($coll=500; $i<=1000000; $i=$i*2) { > > for ($i=0; $i<=1000000; $i++) { > > hash(int8 $i); > > } > > # add the appropriate number of collisions, distributed evenly to > > # minimize the packing overrun problem > > for ($dup=0; $dup<=$coll; $dup++) { > > hash(int8 MAX_INT + $dup * 1000000/$coll); > > } > > } > > > > Ken > > *doh* right something like this... > > create or replace function create_test_hash() returns bool as $$ > declare > coll integer default 500; > -- tweak this to where create index gets really slow > max_coll integer default 1000000; > begin > loop > execute 'create table test_hash_'|| coll ||'(num int8);'; > execute 'insert into test_hash_'|| coll ||' (num) select n > from generate_series(0, '|| max_coll ||') as n;'; > execute 'insert into test_hash_'|| coll ||' (num) select > (n+4294967296) * '|| max_col ||'/'|| coll ||'::int from > generate_series(0, '|| coll ||') as n;'; > > coll := coll * 2; > > exit when coll >= max_coll; > end loop; > return true; > end; > $$ language 'plpgsql'; > > And then benchmark each table, and for extra credit cluster the table > on the index and benchmark that. > > Also obviously with the hashint8 which just ignores the top 32 bits. > > Right? > Yes, that is exactly right. Ken From badalex@gmail.com Fri Sep 12 16:33:13 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 110C664FCD2 for ; Fri, 12 Sep 2008 13:33:13 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 69404-08 for ; Fri, 12 Sep 2008 13:33:03 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mail-gx0-f17.google.com (mail-gx0-f17.google.com [209.85.217.17]) by postgresql.org (Postfix) with ESMTP id 194E364FCCC for ; Fri, 12 Sep 2008 13:33:01 -0300 (ADT) Received: by gxk10 with SMTP id 10so19350681gxk.19 for ; Fri, 12 Sep 2008 09:32:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=aenjIiufy+5de2CeYWGeuyVuCvGkRo/LgLc7pLeS7f0=; b=jrOwPrTGjMNFfRY3fBGIpO5mh7pFEgkXU0bQTvx36oXtlw62BtGBvTA8TNgFwNLs2D 8SkKsE/HNYKdAqllhNtlY7pTiMZHrGQLR5g6/AGm2Wi9CDu4kDjv1wSNwkX7jNbJrLnZ WmRej2AfP6m61nh6I3bOYMU/M0aLLHFn4PcqY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=Kl6QYRuq0xiN3HTCOzv2S+6r8r36kfLbfaMOQf+4Z0XcOlp9NY10VtBaTCo4Lf8G7j 9FqsQE8pPLSLC68ckjoKplhGuPmhrWuua7jq0FxtcZv/bc75Wu901PotdhlUYPa0MP12 07Qrfs1bPkrb6o5MOdV4uqZdtJpvZLRtUb8LQ= Received: by 10.187.203.15 with SMTP id f15mr609916faq.105.1221237177992; Fri, 12 Sep 2008 09:32:57 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Fri, 12 Sep 2008 09:32:57 -0700 (PDT) Message-ID: <34d269d40809120932h3525bb97nbd8d982ff1aff501@mail.gmail.com> Date: Fri, 12 Sep 2008 10:32:57 -0600 From: "Alex Hunsaker" To: "Zdenek Kotala" Subject: Re: hash index improving v3 Cc: "Tom Lane" , "Xiao Meng" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <48CA3312.1040508@sun.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <10995.1220577198@sss.pgh.pa.us> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <34d269d40809092004q10b5da87r6fa3fe86926476ff@mail.gmail.com> <48C7DDF9.6020507@sun.com> <34d269d40809100927n20864e41p65c068c4ec6f6d74@mail.gmail.com> <34d269d40809102045t2f8037a4jfe862264f6f04454@mail.gmail.com> <48CA3312.1040508@sun.com> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/120 X-Sequence-Number: 7135 On Fri, Sep 12, 2008 at 3:14 AM, Zdenek Kotala wrote: > Alex Hunsaker napsal(a): >> >> On Wed, Sep 10, 2008 at 10:27 AM, Alex Hunsaker wrote: >>> >>> On Wed, Sep 10, 2008 at 8:47 AM, Zdenek Kotala >>> wrote: >>>> >>>> What locale did you use? It would be nice to have also comparing between >>>> C >>>> and any UTF8 locale. I think we should see big benefit when non C locale >>>> is >>>> used. >>> >>> Err yes this was UTF8, Ill see about doing a C locale. >>> >> >> And here it with a C locale: >> >> pgbench -c1 -n -t100000 -f bench.sql >> cvs head: tps = 5142.784262 >> v5: tps = 6169.405965 > > > If I look on both results > > C UTF8 difference > ----------------------------------- > cvs head: 5140 5050 -2% > v5: 6170 5750 -7% > improvement: 20% 14% > > than I little bit wonder. I personally expected bigger difference of UTF8 > comparing between CVS a v5. This test also shows that locale selection has > bigger impact on performance in v5 case, but result is still better than cvs > head. Right, I think part of it is I need to try again with a larger dataset... The reason I did three runs before was because it was variable between (v5 between 5700 and 6200). Also the query im doing ming be two simplistic because it runs to fast, thats part of why I get the variable speed between runs (i think...) Suggestions? From tgl@sss.pgh.pa.us Mon Sep 15 02:25:59 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id CBD37650216 for ; Sun, 14 Sep 2008 23:25:59 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 61205-01-4 for ; Sun, 14 Sep 2008 23:25:56 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id E561D6502A9 for ; Sun, 14 Sep 2008 23:16:58 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m8F2Gq3O007248; Sun, 14 Sep 2008 22:16:52 -0400 (EDT) To: Kenneth Marshall cc: Alex Hunsaker , Xiao Meng , Zdenek Kotala , pgsql-patches@postgresql.org, "Jonah H. Harris" Subject: Re: hash index improving v3 In-reply-to: <20080912142921.GB26773@it.is.rice.edu> References: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <22574.1220728178@sss.pgh.pa.us> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> <20080911152437.GM6714@it.is.rice.edu> <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> <20080912142921.GB26773@it.is.rice.edu> Comments: In-reply-to Kenneth Marshall message dated "Fri, 12 Sep 2008 09:29:21 -0500" Date: Sun, 14 Sep 2008 22:16:52 -0400 Message-ID: <7246.1221445012@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/125 X-Sequence-Number: 7140 I did some testing of my own on the hash index patch, and mostly seem to have confirmed Alex's results. I used a table like this: create table tab (f1 serial primary key, f2 some-datatype); create index ind on tab using hash (f2); and populated it with 2 million rows of data; then timed queries like this: select * from tab a join tab b using(f2) where f2 = (select f2 from tab c where c.f1 = (select int4(random() * 2e6))); using pgbench like this: pgbench -n -c 1 -T 60 -M prepared -f query.sql hashdb To test "wide" indexed columns I used a text column with entries of 100 random characters (identical to Alex's test). I saw a performance gain of about 50% with an empty kernel cache (26.9 vs 41.9 tps), dropping to about 14% once the table and index were fully swapped in (4185 vs 4764 tps). This was in a C-locale database. Presumably the win would have been significantly greater in a non-C-locale test, but I didn't try it. To test "narrow" indexed columns I made f2 a bigint containing 2000000 consecutive integers. Here I saw about a 5% improvement with either empty cache (48.1 vs 50.5 tps) or full cache (4590 vs 4800 tps). This is not too surprising since about the same amount of I/O is needed either way, and bigint comparison is very cheap. (This is a 64-bit machine, and it's defaulting to pass-by-value for bigints, so value comparisons are hardly more expensive than hashcode comparisons.) But the patch still wins a bit by being able to do binary search within index pages. In both of the above cases there were only a negligible number of hash collisions. I made up another test case, still 2 million bigints, but with values chosen so that almost every entry had a hash collision with another entry (a small fraction had two or even 3 collisions). This showed about a 25% slowdown compared to CVS HEAD with empty cache (49.9 tps down to 37.2), decreasing to 3% with full cache (4609 vs 4482 tps). I experimented with some variant queries that did more hash index fetches per query, and saw penalties as high as 50%. However, this is surely by far the worst case for the patch: no savings in index size, and a ridiculously high collision rate. Lastly, for comparison's sake I tried the "wide column" case with a btree instead of hash index. This gave me 31.5 tps with empty cache, 4749 tps with full cache. Note that the btree is losing significantly to the patched hash index in empty-cache conditions --- this presumably reflects the much larger index size causing more I/O. I'm thinking that we should go ahead and apply the patch. AFAIR this is the first example we've ever seen of hash beating btree for fetch performance, and it's pretty obvious that removing the indexed value from the index contents is the reason for the win. So I've lost interest in the alternative that involved storing both hashcode and indexed value. We now see a possible production use-case for hash, namely indexing wide column values. BTW, one thing I noticed was that the hash index build time for the "wide column" case got a lot worse after applying the patch (from 56 to 237 sec). The reason for this turned out to be that with the smaller predicted index size, the code decided not to use the pre-sorting method that was recently added. Reducing effective_cache_size to less than the index size brought the time back down, to about 54 sec. So it would seem that effective_cache_size is too large a cutoff value. I'm considering changing hashbuild to switch over at shared_buffers instead of effective_cache_size --- any thoughts about that? regards, tom lane From badalex@gmail.com Tue Sep 23 01:57:23 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 00CBA64FC22 for ; Mon, 22 Sep 2008 22:57:23 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 69759-05 for ; Mon, 22 Sep 2008 22:57:19 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.153]) by postgresql.org (Postfix) with ESMTP id F33B164FC04 for ; Mon, 22 Sep 2008 22:57:18 -0300 (ADT) Received: by fg-out-1718.google.com with SMTP id 16so1693218fgg.23 for ; Mon, 22 Sep 2008 18:57:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type:references; bh=GDSwKtGRONnwIf4+E/H0g16mhf8s3PKqLW625gp/uAI=; b=CtF+b5lRdPCiQ+nGuSvWeQuQIR4ThDNs/eyMqOLZgu7pnulS7H4wo+KV2/0hS/kbw2 XNK9CREuTFlpaDrPu8BYn1VbhFg7bR6bi4mP2slFY64Fh78ndDpHpIUf0A1BEybDgvOW E341GJMpdp+96sORxaOi33nkHh7c7mFUST2bA= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:references; b=k79UqyEcRknf24CUJb2axzaYcfBGoUT+PMtLS+noXBenrBfpMVwdk384xH3ThGGIfW nh5FyhbGgyZvgPG11B6mwK+WP9zMi0IBuecgRzMPOPiymx/3YACM+5oz5kjXTtFLvCDZ U0b4NByyNMa3ZgzyG3fu26p9z7rjGCDFAGPA4= Received: by 10.187.166.12 with SMTP id t12mr637503fao.90.1222135036765; Mon, 22 Sep 2008 18:57:16 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Mon, 22 Sep 2008 18:57:16 -0700 (PDT) Message-ID: <34d269d40809221857m265d27bek29abadf934e19660@mail.gmail.com> Date: Mon, 22 Sep 2008 19:57:16 -0600 From: "Alex Hunsaker" To: "Kenneth Marshall" Subject: Re: hash index improving v3 Cc: "Tom Lane" , "Xiao Meng" , "Zdenek Kotala" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <20080912142921.GB26773@it.is.rice.edu> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_17255_16378233.1222135036754" References: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <34d269d40809061923k4c731481gf580d46d259defb0@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> <20080911152437.GM6714@it.is.rice.edu> <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> <20080912142921.GB26773@it.is.rice.edu> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/145 X-Sequence-Number: 7160 ------=_Part_17255_16378233.1222135036754 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline On Fri, Sep 12, 2008 at 8:29 AM, Kenneth Marshall wrote: > On Thu, Sep 11, 2008 at 08:51:53PM -0600, Alex Hunsaker wrote: >> On Thu, Sep 11, 2008 at 9:24 AM, Kenneth Marshall wrote: >> > Alex, >> > >> > I meant to check the performance with increasing numbers of collisions, >> > not increasing size of the hashed item. In other words, something like >> > this: >> > >> > for ($coll=500; $i<=1000000; $i=$i*2) { >> > for ($i=0; $i<=1000000; $i++) { >> > hash(int8 $i); >> > } >> > # add the appropriate number of collisions, distributed evenly to >> > # minimize the packing overrun problem >> > for ($dup=0; $dup<=$coll; $dup++) { >> > hash(int8 MAX_INT + $dup * 1000000/$coll); >> > } >> > } >> > >> > Ken >> >> *doh* right something like this... >> >> create or replace function create_test_hash() returns bool as $$ >> declare >> coll integer default 500; >> -- tweak this to where create index gets really slow >> max_coll integer default 1000000; >> begin >> loop >> execute 'create table test_hash_'|| coll ||'(num int8);'; >> execute 'insert into test_hash_'|| coll ||' (num) select n >> from generate_series(0, '|| max_coll ||') as n;'; >> execute 'insert into test_hash_'|| coll ||' (num) select >> (n+4294967296) * '|| max_col ||'/'|| coll ||'::int from >> generate_series(0, '|| coll ||') as n;'; >> >> coll := coll * 2; >> >> exit when coll >= max_coll; >> end loop; >> return true; >> end; >> $$ language 'plpgsql'; >> >> And then benchmark each table, and for extra credit cluster the table >> on the index and benchmark that. >> >> Also obviously with the hashint8 which just ignores the top 32 bits. >> >> Right? >> > Yes, that is exactly right. > > Ken Ok I finally found time to do this, In summary looks like v5 scales about the same as cvs head when the collisions are spread evenly (obviously not HEAD with the hash patch applied...). I couldn't test cluster because we can't cluster on hash indexes... benchmark with 50,000,000 rows and 500 collisions: index creation time: head: 326116.647 ms v5: 269509.026 ms pgbench -n -c1 -T600 -f q.sql hash head: tps = 3226.605611 v5: tps = 3412.688884 (excluding connections establishing) 50,000,000 rows and 32,768,000 collisions index time: head: 576600.967 ms v5 : 487949.490 ms pgbench -n -c1 -T500 -f q.sql hash head: tps = 3105.270185 v5: tps = 3382.25782 You can see each result from 500 all the way up to 32,768,000 collision in the attached result.out Attached files: create_test_hash.sql: function I used to create the test tables result.out: output from bench.pl which shows the pgbench results and the create index times bench.pl: stupid little perl script to test pgbench each of the created tables from create_test_hash.pl ------=_Part_17255_16378233.1222135036754 Content-Type: application/x-perl; name=bench.pl Content-Transfer-Encoding: base64 X-Attachment-Id: f_flfveh4q0 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SQLgrey-1.7.6 Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.157]) by postgresql.org (Postfix) with ESMTP id AF45864FC26 for ; Tue, 23 Sep 2008 00:25:04 -0300 (ADT) Received: by fg-out-1718.google.com with SMTP id 16so1715926fgg.23 for ; Mon, 22 Sep 2008 20:25:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=r62WBFrK7L3CMNEN+EILhcUb/eHx/C1Snsot7LMCkMw=; b=dFZNopfzuQRD44cobV7/9KLHbCoSF9q/j9McR7KNBDAFwKtHuCYmklvB+iSCiQiKaU WwAOoo3Hvpg8NEf9F4QM4hqxzqgwZWgwl1l/ItXCSwhfs/c2PXqqNpLN7hfoD8FIcd+X YLLFJLyRBMjB8ArUXzI7u+dd6pB6gZ2VBFkPo= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=f3WX2mXipwPUeqMjFi0XTozGuAdC5Bc23d/IQOUGZzjmn/SEiSpSWw1mUDwlxXjX7K vNsgqRmYU7P/1rWK4tPjg5z0Nc+bMZsKOimE1ZjOSLsWJolL7sB5chjNVD1IBL3Cr+8w wv4U+PJB6Vd5sybXAzavvIpEfMxMCTQD78kBE= Received: by 10.187.160.1 with SMTP id m1mr647856fao.72.1222140303238; Mon, 22 Sep 2008 20:25:03 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Mon, 22 Sep 2008 20:25:03 -0700 (PDT) Message-ID: <34d269d40809222025k2b2252dft89db471649c8eef8@mail.gmail.com> Date: Mon, 22 Sep 2008 21:25:03 -0600 From: "Alex Hunsaker" To: "Tom Lane" Subject: Re: hash index improving v3 Cc: "Kenneth Marshall" , "Xiao Meng" , "Zdenek Kotala" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <7246.1221445012@sss.pgh.pa.us> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> <20080911152437.GM6714@it.is.rice.edu> <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> <20080912142921.GB26773@it.is.rice.edu> <7246.1221445012@sss.pgh.pa.us> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/146 X-Sequence-Number: 7161 On Sun, Sep 14, 2008 at 8:16 PM, Tom Lane wrote: > BTW, one thing I noticed was that the hash index build time for the > "wide column" case got a lot worse after applying the patch (from 56 to > 237 sec). The reason for this turned out to be that with the smaller > predicted index size, the code decided not to use the pre-sorting method > that was recently added. Reducing effective_cache_size to less than the > index size brought the time back down, to about 54 sec. So it would > seem that effective_cache_size is too large a cutoff value. I'm > considering changing hashbuild to switch over at shared_buffers instead > of effective_cache_size --- any thoughts about that? Switching to shared_buffers gets my vote, on my test table with 50,000,000 rows it takes about 8 minutes to create an index using the default effective_cache_size. With effective_cache_size set to 6GB (machine has 8GB) its still going an hour later. From jonah.harris@gmail.com Tue Sep 23 03:31:02 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id B399864FC21 for ; Tue, 23 Sep 2008 00:31:02 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 14127-03 for ; Tue, 23 Sep 2008 00:31:00 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from wf-out-1314.google.com (wf-out-1314.google.com [209.85.200.171]) by postgresql.org (Postfix) with ESMTP id 0BAD864FC20 for ; Tue, 23 Sep 2008 00:30:59 -0300 (ADT) Received: by wf-out-1314.google.com with SMTP id 25so2041944wfc.28 for ; Mon, 22 Sep 2008 20:30:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=hIykgcwv/6aTZJipThnJ8YoqYIKtPjHxZsK8mLRYvgc=; b=aUgdBZ/VQV9DrAKGXEQ7g32sjSInY21nrd+DvmnrXY13zDeT7p2520z4BqKbkfPdkZ bopfrT3ymC7WXeAgZJPmXmj8ortWCzD25kXmjWixw39GYFfGpNDGy3BOpX50r9bmsnnn X0ilXD4mUnsjqsKeuqImgm1Pn6VLmziWuY26k= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=D4wIccnxxwY5NestFT9lCBJPsfqp4HSr/MDsioh9rrzhxRvUFKqTZRfHruTeQqcBtI WQ0xZyFEnRDhNJVJqaETN9/RwhRNyPt0LDO+0iLOP2i7syU7GupvbOMZx7Pc6RtSj3sk dCK0NnmEKou9Z6nweaXo1OgF0hf3EVpkvE8tY= Received: by 10.142.218.4 with SMTP id q4mr1770261wfg.273.1222140658744; Mon, 22 Sep 2008 20:30:58 -0700 (PDT) Received: by 10.143.16.11 with HTTP; Mon, 22 Sep 2008 20:30:58 -0700 (PDT) Message-ID: <36e682920809222030k49293e85jc57429296c5d2d76@mail.gmail.com> Date: Mon, 22 Sep 2008 23:30:58 -0400 From: "Jonah H. Harris" To: "Alex Hunsaker" Subject: Re: hash index improving v3 Cc: "Tom Lane" , "Kenneth Marshall" , "Xiao Meng" , "Zdenek Kotala" , pgsql-patches@postgresql.org In-Reply-To: <34d269d40809222025k2b2252dft89db471649c8eef8@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> <20080911152437.GM6714@it.is.rice.edu> <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> <20080912142921.GB26773@it.is.rice.edu> <7246.1221445012@sss.pgh.pa.us> <34d269d40809222025k2b2252dft89db471649c8eef8@mail.gmail.com> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/147 X-Sequence-Number: 7162 On Mon, Sep 22, 2008 at 11:25 PM, Alex Hunsaker wrote: > On Sun, Sep 14, 2008 at 8:16 PM, Tom Lane wrote: >> BTW, one thing I noticed was that the hash index build time for the >> "wide column" case got a lot worse after applying the patch (from 56 to >> 237 sec). The reason for this turned out to be that with the smaller >> predicted index size, the code decided not to use the pre-sorting method >> that was recently added. Reducing effective_cache_size to less than the >> index size brought the time back down, to about 54 sec. So it would >> seem that effective_cache_size is too large a cutoff value. I'm >> considering changing hashbuild to switch over at shared_buffers instead >> of effective_cache_size --- any thoughts about that? > > Switching to shared_buffers gets my vote, on my test table with > 50,000,000 rows it takes about 8 minutes to create an index using the > default effective_cache_size. With effective_cache_size set to 6GB > (machine has 8GB) its still going an hour later. Agreed. I think using shared_buffers as a cutoff is a much better idea as well. -- Jonah H. Harris, Senior DBA myYearbook.com From badalex@gmail.com Tue Sep 23 03:43:19 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 04C5C64FC21 for ; Tue, 23 Sep 2008 00:43:19 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 15304-09 for ; Tue, 23 Sep 2008 00:43:16 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from fk-out-0910.google.com (fk-out-0910.google.com [209.85.128.184]) by postgresql.org (Postfix) with ESMTP id 54F5D64FC20 for ; Tue, 23 Sep 2008 00:43:16 -0300 (ADT) Received: by fk-out-0910.google.com with SMTP id e30so1929636fke.3 for ; Mon, 22 Sep 2008 20:43:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=pnpNCbjtBfgl+WmFSz/tVzAoz0mt51YGcEBwCGg4Iq8=; b=GdFcS5grIOaAXeJ/euSPdH/fsqxpAaBiusocL0nemEAyfGfxZQfT0tzz2zYVDJb2Na lYxKbgdcF3CwUtJQsI6UbrrnUNA+qA8ewmmA86eTTk4l/shuf+VDEDmK95anbW7AmfI2 tGWLrpGEaIrKDOSg129g5dS9pY8wmvO07+L4M= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=MAGlPdBJSZkI+jTfmEjdNZAFG5Pw0zXAN7JFaaj3mEb69FaDDJiZj6uybrU/YNgTks pfcd5WUMF3ab9UkcAPXPdXLpAdMXh96rEhbbjy5lk/akM99WkHJJVhM1Z/eUMzzYpEc4 yPKiZDjQHJjGAotDhBaOtHrzCSSFCN9IJeEb0= Received: by 10.187.194.1 with SMTP id w1mr648767fap.41.1222141394800; Mon, 22 Sep 2008 20:43:14 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Mon, 22 Sep 2008 20:43:14 -0700 (PDT) Message-ID: <34d269d40809222043k39994e71k56c09703ce21b789@mail.gmail.com> Date: Mon, 22 Sep 2008 21:43:14 -0600 From: "Alex Hunsaker" To: "Kenneth Marshall" Subject: Re: hash index improving v3 Cc: "Tom Lane" , "Xiao Meng" , "Zdenek Kotala" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <34d269d40809221857m265d27bek29abadf934e19660@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <20080909134839.GC6714@it.is.rice.edu> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> <20080911152437.GM6714@it.is.rice.edu> <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> <20080912142921.GB26773@it.is.rice.edu> <34d269d40809221857m265d27bek29abadf934e19660@mail.gmail.com> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/148 X-Sequence-Number: 7163 On Mon, Sep 22, 2008 at 7:57 PM, Alex Hunsaker wrote: > 50,000,000 rows and 32,768,000 collisions I should mention thats 50 million rows + 32 million more or 62,768,000 rows which explains some of the added index creation time... > index time: > head: 576600.967 ms > v5 : 487949.490 ms From tgl@sss.pgh.pa.us Tue Sep 23 04:06:12 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 520D364FC22 for ; Tue, 23 Sep 2008 01:06:12 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 20076-02 for ; Tue, 23 Sep 2008 01:06:04 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 4BF3664FC21 for ; Tue, 23 Sep 2008 01:06:02 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m8N45xVU017324; Tue, 23 Sep 2008 00:05:59 -0400 (EDT) To: "Jonah H. Harris" cc: "Alex Hunsaker" , "Kenneth Marshall" , "Xiao Meng" , "Zdenek Kotala" , pgsql-patches@postgresql.org Subject: Re: hash index improving v3 In-reply-to: <36e682920809222030k49293e85jc57429296c5d2d76@mail.gmail.com> References: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> <20080911152437.GM6714@it.is.rice.edu> <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> <20080912142921.GB26773@it.is.rice.edu> <7246.1221445012@sss.pgh.pa.us> <34d269d40809222025k2b2252dft89db471649c8eef8@mail.gmail.com> <36e682920809222030k49293e85jc57429296c5d2d76@mail.gmail.com> Comments: In-reply-to "Jonah H. Harris" message dated "Mon, 22 Sep 2008 23:30:58 -0400" Date: Tue, 23 Sep 2008 00:05:59 -0400 Message-ID: <17323.1222142759@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/149 X-Sequence-Number: 7164 "Jonah H. Harris" writes: > On Mon, Sep 22, 2008 at 11:25 PM, Alex Hunsaker wrote: >> On Sun, Sep 14, 2008 at 8:16 PM, Tom Lane wrote: >>> I'm considering changing hashbuild to switch over at shared_buffers instead >>> of effective_cache_size --- any thoughts about that? >> >> Switching to shared_buffers gets my vote, on my test table with >> 50,000,000 rows it takes about 8 minutes to create an index using the >> default effective_cache_size. With effective_cache_size set to 6GB >> (machine has 8GB) its still going an hour later. > Agreed. I think using shared_buffers as a cutoff is a much better idea as well. Already done in CVS a week or so back, but thanks for following up with some confirmation. regards, tom lane From simon@2ndQuadrant.com Tue Sep 23 04:30:31 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 7CA2364FC20 for ; Tue, 23 Sep 2008 01:30:31 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 23212-03 for ; Tue, 23 Sep 2008 01:30:20 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from outmail136189.authsmtp.net (outmail136189.authsmtp.net [62.13.136.189]) by postgresql.org (Postfix) with ESMTP id 7CFFB64FC0A for ; Tue, 23 Sep 2008 01:30:12 -0300 (ADT) Received: from mail-c187.authsmtp.com (mail-c187.authsmtp.com [62.13.128.33]) by punt6.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id m8N4UA1m016786; Tue, 23 Sep 2008 05:30:10 +0100 (BST) Received: from [192.168.0.3] (85-211-71-126.dyn.gotadsl.co.uk [85.211.71.126]) (authenticated bits=0) by mail.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id m8N4UAD3069188; Tue, 23 Sep 2008 05:30:10 +0100 (BST) Subject: Re: hash index improving v3 From: Simon Riggs To: Tom Lane Cc: "Jonah H. Harris" , Alex Hunsaker , Kenneth Marshall , Xiao Meng , Zdenek Kotala , pgsql-patches@postgresql.org In-Reply-To: <17323.1222142759@sss.pgh.pa.us> References: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> <20080911152437.GM6714@it.is.rice.edu> <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> <20080912142921.GB26773@it.is.rice.edu> <7246.1221445012@sss.pgh.pa.us> <34d269d40809222025k2b2252dft89db471649c8eef8@mail.gmail.com> <36e682920809222030k49293e85jc57429296c5d2d76@mail.gmail.com> <17323.1222142759@sss.pgh.pa.us> Content-Type: text/plain Date: Tue, 23 Sep 2008 05:31:02 +0100 Message-Id: <1222144262.4445.265.camel@ebony.2ndQuadrant> Mime-Version: 1.0 X-Mailer: Evolution 2.12.0 Content-Transfer-Encoding: 7bit X-Server-Quench: 4f026350-8928-11dd-8155-001185d377ca X-AuthRoute: OCdxZQATClZOTQEd DAteCiNZVAwpPBRK HVkIKg5MJUcNSQVJ NksacRtFagZbflxB HGQLW1xEUFh7WmN/ agofZQBDYEtPQQJr TklLRE1QEQdtHhxP WxZgVnwDAwZGfndx bU4sXXFdWQp+I0Z/ RE1RFXAObGVodWEe BBRFfwJRdR5Kfh5E YlUrV3QKMjRJBC9q VzwLFgwaHRhkHWxV SxoNZVMUTUsbVj85 XwoFAzQpEgUbHE1p X-Authentic-SMTP: 61633235383639.squirrel.dmpriest.net.uk:1374/Kp X-Report-SPAM: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-Virus-Status: No virus detected - but ensure you scan with your own anti-virus system! X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/150 X-Sequence-Number: 7165 On Tue, 2008-09-23 at 00:05 -0400, Tom Lane wrote: > "Jonah H. Harris" writes: > > On Mon, Sep 22, 2008 at 11:25 PM, Alex Hunsaker wrote: > >> On Sun, Sep 14, 2008 at 8:16 PM, Tom Lane wrote: > >>> I'm considering changing hashbuild to switch over at shared_buffers instead > >>> of effective_cache_size --- any thoughts about that? > >> > >> Switching to shared_buffers gets my vote, on my test table with > >> 50,000,000 rows it takes about 8 minutes to create an index using the > >> default effective_cache_size. With effective_cache_size set to 6GB > >> (machine has 8GB) its still going an hour later. > > > Agreed. I think using shared_buffers as a cutoff is a much better idea as well. > > Already done in CVS a week or so back, but thanks for following up with > some confirmation. I think nobody noticed that change, or the discussion. I wasn't very happy with effective_cache_size and not happy with shared_buffers either. If building hash indexes is memory critical then we just need to say so and encourage others to set memory use correctly. People are already aware that maintenance_work_mem needs to be increased for large index builds and we will confuse people if we ignore that and use another parameter instead. At the very least, a controllable parameter is the only appropriate choice for production systems, not one that cannot be changed without restart. It would also throw away any chance of having pg_restore of hash indexes run in parallel, since it will not be able to control memory usage. Setting maintenance_work_mem higher than shared buffers is easily possible now and we should just use that rather than try to prejudge how people will and can configure their systems. If maintenance_work_mem default is too low, lets increase it. -- Simon Riggs www.2ndQuadrant.com PostgreSQL Training, Services and Support From tgl@sss.pgh.pa.us Tue Sep 23 04:48:57 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 3219464FC0A for ; Tue, 23 Sep 2008 01:48:57 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 25982-09 for ; Tue, 23 Sep 2008 01:48:54 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 55CCA64FC04 for ; Tue, 23 Sep 2008 01:48:54 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m8N4maM9018050; Tue, 23 Sep 2008 00:48:36 -0400 (EDT) To: Simon Riggs cc: "Jonah H. Harris" , Alex Hunsaker , Kenneth Marshall , Xiao Meng , Zdenek Kotala , pgsql-patches@postgresql.org Subject: Re: hash index improving v3 In-reply-to: <1222144262.4445.265.camel@ebony.2ndQuadrant> References: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> <20080911152437.GM6714@it.is.rice.edu> <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> <20080912142921.GB26773@it.is.rice.edu> <7246.1221445012@sss.pgh.pa.us> <34d269d40809222025k2b2252dft89db471649c8eef8@mail.gmail.com> <36e682920809222030k49293e85jc57429296c5d2d76@mail.gmail.com> <17323.1222142759@sss.pgh.pa.us> <1222144262.4445.265.camel@ebony.2ndQuadrant> Comments: In-reply-to Simon Riggs message dated "Tue, 23 Sep 2008 05:31:02 +0100" Date: Tue, 23 Sep 2008 00:48:36 -0400 Message-ID: <18049.1222145316@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/151 X-Sequence-Number: 7166 Simon Riggs writes: > I wasn't very happy with effective_cache_size and not happy with > shared_buffers either. If building hash indexes is memory critical then > we just need to say so and encourage others to set memory use correctly. > People are already aware that maintenance_work_mem needs to be increased > for large index builds and we will confuse people if we ignore that and > use another parameter instead. I think you've got this completely backwards. The general theory about maintenance_work_mem is "set it as large as you can stand it". The issue at hand here is that the crossover point for hash index sort building seems to be a good deal less than all-the-memory-you-have. Perhaps there is a case for giving this behavior its very own configuration parameter; but seeing that we still don't have all that much of a use case for hash indexes at all, I don't feel a need to do that yet. In any case, tying it to maintenance_work_mem is certainly wrong. regards, tom lane From simon@2ndQuadrant.com Tue Sep 23 05:14:49 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 92FBB64FC1A for ; Tue, 23 Sep 2008 02:14:49 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 29392-07 for ; Tue, 23 Sep 2008 02:14:46 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from outmail128142.authsmtp.net (outmail128142.authsmtp.net [62.13.128.142]) by postgresql.org (Postfix) with ESMTP id 9CA9864FC17 for ; Tue, 23 Sep 2008 02:14:46 -0300 (ADT) Received: from mail-c187.authsmtp.com (mail-c187.authsmtp.com [62.13.128.33]) by punt2.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id m8N5Eh2K076122; Tue, 23 Sep 2008 06:14:43 +0100 (BST) Received: from [192.168.0.3] (85-211-71-126.dyn.gotadsl.co.uk [85.211.71.126]) (authenticated bits=0) by mail.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id m8N5EgPx077710; Tue, 23 Sep 2008 06:14:43 +0100 (BST) Subject: Re: hash index improving v3 From: Simon Riggs To: Tom Lane Cc: "Jonah H. Harris" , Alex Hunsaker , Kenneth Marshall , Xiao Meng , Zdenek Kotala , pgsql-patches@postgresql.org In-Reply-To: <18049.1222145316@sss.pgh.pa.us> References: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> <20080911152437.GM6714@it.is.rice.edu> <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> <20080912142921.GB26773@it.is.rice.edu> <7246.1221445012@sss.pgh.pa.us> <34d269d40809222025k2b2252dft89db471649c8eef8@mail.gmail.com> <36e682920809222030k49293e85jc57429296c5d2d76@mail.gmail.com> <17323.1222142759@sss.pgh.pa.us> <1222144262.4445.265.camel@ebony.2ndQuadrant> <18049.1222145316@sss.pgh.pa.us> Content-Type: text/plain Date: Tue, 23 Sep 2008 06:15:36 +0100 Message-Id: <1222146936.4445.290.camel@ebony.2ndQuadrant> Mime-Version: 1.0 X-Mailer: Evolution 2.12.0 Content-Transfer-Encoding: 7bit X-Server-Quench: 8818e07a-892e-11dd-8155-001185d377ca X-AuthRoute: OCdxZQATClZOTQEd DAteCiNZVAwpPBRK HVkIKg5MJUcNSQVJ NksacRtFagZbflxB HGQLW1xEUFt7WGd/ bwkfZQBDYEtPQQJr TklLRE1QEQdtHhxP WxZgV2wlF01Gf3l3 ZEYsXHhSVApyfUd1 F05TRHAObGU1dWEe BBRFfwJRdR5Kfh5E YlUrV3QKMjRJBC9q VzwLFgwaHRhkHWxV SxoNZVMUTUsbVj85 XwoFAzQpEgUbHE1p X-Authentic-SMTP: 61633235383639.squirrel.dmpriest.net.uk:1374/Kp X-Report-SPAM: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-Virus-Status: No virus detected - but ensure you scan with your own anti-virus system! X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/152 X-Sequence-Number: 7167 On Tue, 2008-09-23 at 00:48 -0400, Tom Lane wrote: > Simon Riggs writes: > > I wasn't very happy with effective_cache_size and not happy with > > shared_buffers either. If building hash indexes is memory critical then > > we just need to say so and encourage others to set memory use correctly. > > People are already aware that maintenance_work_mem needs to be increased > > for large index builds and we will confuse people if we ignore that and > > use another parameter instead. > > I think you've got this completely backwards. The general theory about > maintenance_work_mem is "set it as large as you can stand it". The > issue at hand here is that the crossover point for hash index sort > building seems to be a good deal less than all-the-memory-you-have. There's an optimal point for btree builds using sorts that is a good deal less also, so I don't get that. Plus, if you give it all-the-memory-you-have there won't be anything left for anything else. You might set it that high for an empty database load but you don't set it that high in production unless you want to see swapping when you create large indexes. maintenance_work_mem is already used for 3 separate operations that bear little resemblance to each other. If it's appropriate for all of those then its appropriate for this usage also. Doing it otherwise is going to mean more than 50% of people do the wrong thing, which would be a shame because what's been done looks very cool. -- Simon Riggs www.2ndQuadrant.com PostgreSQL Training, Services and Support From tgl@sss.pgh.pa.us Tue Sep 23 12:17:03 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 72D8264FC0E for ; Tue, 23 Sep 2008 09:17:03 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 06430-06 for ; Tue, 23 Sep 2008 09:17:00 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 5E8FF64FC0D for ; Tue, 23 Sep 2008 09:17:00 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m8NCGZaD025194; Tue, 23 Sep 2008 08:16:35 -0400 (EDT) To: Simon Riggs cc: "Jonah H. Harris" , Alex Hunsaker , Kenneth Marshall , Xiao Meng , Zdenek Kotala , pgsql-patches@postgresql.org Subject: Re: hash index improving v3 In-reply-to: <1222146936.4445.290.camel@ebony.2ndQuadrant> References: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> <20080911152437.GM6714@it.is.rice.edu> <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> <20080912142921.GB26773@it.is.rice.edu> <7246.1221445012@sss.pgh.pa.us> <34d269d40809222025k2b2252dft89db471649c8eef8@mail.gmail.com> <36e682920809222030k49293e85jc57429296c5d2d76@mail.gmail.com> <17323.1222142759@sss.pgh.pa.us> <1222144262.4445.265.camel@ebony.2ndQuadrant> <18049.1222145316@sss.pgh.pa.us> <1222146936.4445.290.camel@ebony.2ndQuadrant> Comments: In-reply-to Simon Riggs message dated "Tue, 23 Sep 2008 06:15:36 +0100" Date: Tue, 23 Sep 2008 08:16:34 -0400 Message-ID: <25193.1222172194@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/153 X-Sequence-Number: 7168 Simon Riggs writes: > maintenance_work_mem is already used for 3 separate operations that bear > little resemblance to each other. If it's appropriate for all of those > then its appropriate for this usage also. No, it isn't. The fundamental point here is that this isn't a memory allocation parameter; it's a switchover threshold between two different behaviors. regards, tom lane From simon@2ndQuadrant.com Tue Sep 23 13:04:29 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 17FE664FC1C for ; Tue, 23 Sep 2008 10:04:29 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 15900-01 for ; Tue, 23 Sep 2008 10:04:24 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from outmail137074.authsmtp.com (outmail137074.authsmtp.com [62.13.137.74]) by postgresql.org (Postfix) with ESMTP id 8908664FC15 for ; Tue, 23 Sep 2008 10:04:24 -0300 (ADT) Received: from mail-c189.authsmtp.com (mail-c189.authsmtp.com [62.13.128.71]) by punt4.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id m8ND4Mlf029183; Tue, 23 Sep 2008 14:04:22 +0100 (BST) Received: from [192.168.0.3] (85-211-71-126.dyn.gotadsl.co.uk [85.211.71.126]) (authenticated bits=0) by mail.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id m8ND4KHx019439; Tue, 23 Sep 2008 14:04:20 +0100 (BST) Subject: Re: hash index improving v3 From: Simon Riggs To: Tom Lane Cc: "Jonah H. Harris" , Alex Hunsaker , Kenneth Marshall , Xiao Meng , Zdenek Kotala , pgsql-patches@postgresql.org In-Reply-To: <25193.1222172194@sss.pgh.pa.us> References: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> <20080911152437.GM6714@it.is.rice.edu> <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> <20080912142921.GB26773@it.is.rice.edu> <7246.1221445012@sss.pgh.pa.us> <34d269d40809222025k2b2252dft89db471649c8eef8@mail.gmail.com> <36e682920809222030k49293e85jc57429296c5d2d76@mail.gmail.com> <17323.1222142759@sss.pgh.pa.us> <1222144262.4445.265.camel@ebony.2ndQuadrant> <18049.1222145316@sss.pgh.pa.us> <1222146936.4445.290.camel@ebony.2ndQuadrant> <25193.1222172194@sss.pgh.pa.us> Content-Type: text/plain Date: Tue, 23 Sep 2008 14:05:15 +0100 Message-Id: <1222175115.4445.344.camel@ebony.2ndQuadrant> Mime-Version: 1.0 X-Mailer: Evolution 2.12.0 Content-Transfer-Encoding: 7bit X-Server-Quench: 235decb6-8970-11dd-bc7a-001f29070be2 X-AuthRoute: OCdxZQATClZOTQEd DAteCiNZVAwpPBRK HVkIKg5MJUcNSQVJ NksacRtFagZbflxB HGQLW1xEUVl7WWd/ aQsfZQBDYEtPQQJr TklLRE1QEQdtHhxP WxZgJh0JD01GeXd0 Zk8sXHVeWAp4dkMp Fx0GE3AObGBgdWEe BBRFJVBTIR5Kfh4T aFl/U3NfNGdJBC9q VzwLFgwaHRhkHWxV SxoNZVMUTUsbVj85 XwoFAzQpEgUbHE1p X-Authentic-SMTP: 61633235383639.kestrel.dmpriest.net.uk:1374/Kp X-Report-SPAM: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-Virus-Status: No virus detected - but ensure you scan with your own anti-virus system! X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/154 X-Sequence-Number: 7169 On Tue, 2008-09-23 at 08:16 -0400, Tom Lane wrote: > Simon Riggs writes: > > maintenance_work_mem is already used for 3 separate operations that bear > > little resemblance to each other. If it's appropriate for all of those > > then its appropriate for this usage also. > > No, it isn't. > > The fundamental point here is that this isn't a memory allocation > parameter; it's a switchover threshold between two different behaviors. That's a little confusing since sorts switch their behaviour also, but use (some form of) work_mem, which is *also* their max allocation. I see the difficulty in understanding the algorithm's behaviour now. So shared_buffers is the wrong parameter, but even if we had a parameter it would be very difficult to set it. Thinks: Why not just sort all of the time and skip the debate entirely? I thought the main use case was for larger indexes, since that's when the number of levels in the index is significantly less than btrees? Do we need to optimise creation time of smaller hash indexes at all? -- Simon Riggs www.2ndQuadrant.com PostgreSQL Training, Services and Support From tgl@sss.pgh.pa.us Tue Sep 23 13:13:44 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 7B5F664FC1C for ; Tue, 23 Sep 2008 10:13:44 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 16915-06 for ; Tue, 23 Sep 2008 10:13:37 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 7FBD064FC15 for ; Tue, 23 Sep 2008 10:13:37 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m8NDDEA4026333; Tue, 23 Sep 2008 09:13:14 -0400 (EDT) To: Simon Riggs cc: "Jonah H. Harris" , Alex Hunsaker , Kenneth Marshall , Xiao Meng , Zdenek Kotala , pgsql-patches@postgresql.org Subject: Re: hash index improving v3 In-reply-to: <1222175115.4445.344.camel@ebony.2ndQuadrant> References: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> <20080911152437.GM6714@it.is.rice.edu> <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> <20080912142921.GB26773@it.is.rice.edu> <7246.1221445012@sss.pgh.pa.us> <34d269d40809222025k2b2252dft89db471649c8eef8@mail.gmail.com> <36e682920809222030k49293e85jc57429296c5d2d76@mail.gmail.com> <17323.1222142759@sss.pgh.pa.us> <1222144262.4445.265.camel@ebony.2ndQuadrant> <18049.1222145316@sss.pgh.pa.us> <1222146936.4445.290.camel@ebony.2ndQuadrant> <25193.1222172194@sss.pgh.pa.us> <1222175115.4445.344.camel@ebony.2ndQuadrant> Comments: In-reply-to Simon Riggs message dated "Tue, 23 Sep 2008 14:05:15 +0100" Date: Tue, 23 Sep 2008 09:13:14 -0400 Message-ID: <26331.1222175594@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/155 X-Sequence-Number: 7170 Simon Riggs writes: > Thinks: Why not just sort all of the time and skip the debate entirely? The sort is demonstrably a loser for smaller indexes. Admittedly, if the index is small then the sort can't cost all that much, but if the (correct) threshold is some large fraction of shared_buffers then it could still take awhile on installations with lots-o-buffers. The other side of that coin is that it's not clear this is really worth arguing about, much less exposing a separate parameter for. regards, tom lane From simon@2ndQuadrant.com Tue Sep 23 13:26:17 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id DA1C464FC1C for ; Tue, 23 Sep 2008 10:26:17 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 19047-10 for ; Tue, 23 Sep 2008 10:26:12 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from outmail137074.authsmtp.com (outmail137074.authsmtp.com [62.13.137.74]) by postgresql.org (Postfix) with ESMTP id E042864FC21 for ; Tue, 23 Sep 2008 10:26:11 -0300 (ADT) Received: from mail-c187.authsmtp.com (mail-c187.authsmtp.com [62.13.128.33]) by punt4.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id m8NDQAHk049216; Tue, 23 Sep 2008 14:26:10 +0100 (BST) Received: from [192.168.0.3] (85-211-71-126.dyn.gotadsl.co.uk [85.211.71.126]) (authenticated bits=0) by mail.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id m8NDQ7O8034158; Tue, 23 Sep 2008 14:26:07 +0100 (BST) Subject: Re: hash index improving v3 From: Simon Riggs To: Tom Lane Cc: "Jonah H. Harris" , Alex Hunsaker , Kenneth Marshall , Xiao Meng , Zdenek Kotala , pgsql-patches@postgresql.org In-Reply-To: <26331.1222175594@sss.pgh.pa.us> References: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> <20080911152437.GM6714@it.is.rice.edu> <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> <20080912142921.GB26773@it.is.rice.edu> <7246.1221445012@sss.pgh.pa.us> <34d269d40809222025k2b2252dft89db471649c8eef8@mail.gmail.com> <36e682920809222030k49293e85jc57429296c5d2d76@mail.gmail.com> <17323.1222142759@sss.pgh.pa.us> <1222144262.4445.265.camel@ebony.2ndQuadrant> <18049.1222145316@sss.pgh.pa.us> <1222146936.4445.290.camel@ebony.2ndQuadrant> <25193.1222172194@sss.pgh.pa.us> <1222175115.4445.344.camel@ebony.2ndQuadrant> <26331.1222175594@sss.pgh.pa.us> Content-Type: text/plain Date: Tue, 23 Sep 2008 14:27:02 +0100 Message-Id: <1222176422.4445.354.camel@ebony.2ndQuadrant> Mime-Version: 1.0 X-Mailer: Evolution 2.12.0 Content-Transfer-Encoding: 7bit X-Server-Quench: 2e6dfcc1-8973-11dd-8155-001185d377ca X-AuthRoute: OCdxZQATClZOTQEd DAteCiNZVAwpPBRK HVkIKg5MJUcNSQVJ NksacRtFagZbflxB HGQLW1xEUVl7W2V/ awIfZQBDYEtPQQJr TklLRE1QEQdtHhxP WxZgJnh1CA1Ge3px YE4sX3dcXwp4IEAp FB0HFHAObGBjdWEe BBRFfwJRdR5Kfh5E YlUrV3QKMjRJBC9q VzwLFgwaHRhkHWxV SxoNZVMUTUsbVj85 XwoFAzQpEgUbHE1p X-Authentic-SMTP: 61633235383639.squirrel.dmpriest.net.uk:1374/Kp X-Report-SPAM: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-Virus-Status: No virus detected - but ensure you scan with your own anti-virus system! X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/156 X-Sequence-Number: 7171 On Tue, 2008-09-23 at 09:13 -0400, Tom Lane wrote: > The other side of that coin is that it's not clear this is really worth > arguing about, much less exposing a separate parameter for. Agreed. -- Simon Riggs www.2ndQuadrant.com PostgreSQL Training, Services and Support From simon@2ndQuadrant.com Tue Sep 23 13:34:10 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 0A2E264FC20 for ; Tue, 23 Sep 2008 10:34:10 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 20053-09 for ; Tue, 23 Sep 2008 10:34:04 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from outmail128097.authsmtp.com (outmail128097.authsmtp.com [62.13.128.97]) by postgresql.org (Postfix) with ESMTP id 17BFD64FC0D for ; Tue, 23 Sep 2008 10:34:03 -0300 (ADT) Received: from mail-c189.authsmtp.com (mail-c189.authsmtp.com [62.13.128.71]) by punt5.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id m8NDXqNp094496; Tue, 23 Sep 2008 14:33:52 +0100 (BST) Received: from [192.168.0.3] (85-211-71-126.dyn.gotadsl.co.uk [85.211.71.126]) (authenticated bits=0) by mail.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id m8NDXocw036229; Tue, 23 Sep 2008 14:33:50 +0100 (BST) Subject: Re: hash index improving v3 From: Simon Riggs To: Tom Lane Cc: "Jonah H. Harris" , Alex Hunsaker , Kenneth Marshall , Xiao Meng , Zdenek Kotala , pgsql-patches@postgresql.org In-Reply-To: <26331.1222175594@sss.pgh.pa.us> References: <34d269d40809052249h59750f83v4b19a50d0555580@mail.gmail.com> <34d269d40809091823t204e252fl246443be71aed9ff@mail.gmail.com> <20080910130401.GG6714@it.is.rice.edu> <34d269d40809102049y2599a381kf409c0b5f18b6170@mail.gmail.com> <34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com> <20080911152437.GM6714@it.is.rice.edu> <34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com> <20080912142921.GB26773@it.is.rice.edu> <7246.1221445012@sss.pgh.pa.us> <34d269d40809222025k2b2252dft89db471649c8eef8@mail.gmail.com> <36e682920809222030k49293e85jc57429296c5d2d76@mail.gmail.com> <17323.1222142759@sss.pgh.pa.us> <1222144262.4445.265.camel@ebony.2ndQuadrant> <18049.1222145316@sss.pgh.pa.us> <1222146936.4445.290.camel@ebony.2ndQuadrant> <25193.1222172194@sss.pgh.pa.us> <1222175115.4445.344.camel@ebony.2ndQuadrant> <26331.1222175594@sss.pgh.pa.us> Content-Type: text/plain Date: Tue, 23 Sep 2008 14:34:39 +0100 Message-Id: <1222176879.4445.361.camel@ebony.2ndQuadrant> Mime-Version: 1.0 X-Mailer: Evolution 2.12.0 Content-Transfer-Encoding: 7bit X-Server-Quench: 422a1c80-8974-11dd-bc7a-001f29070be2 X-AuthRoute: OCdxZQATClZOTQEd DAteCiNZVAwpPBRK HVkIKg5MJUcNSQVJ NksacRtFagZbflxB HGQLW1xEUVl7WmB/ bgsfZQBDYEtPQQJr TklLRE1QEQdtHhxP WxZgJnEtJEJGe3hy Z08sXHNTXAp+d0Qs Qx1cFXAObGBkdWEe BBRFJVBTIR5Kfh4T aFl/U3NfNGdJBC9q VzwLFgwaHRhkHWxV SxoNZVMUTUsbVj85 XwoFAzQpEgUbHE1p X-Authentic-SMTP: 61633235383639.kestrel.dmpriest.net.uk:1374/Kp X-Report-SPAM: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-Virus-Status: No virus detected - but ensure you scan with your own anti-virus system! X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/157 X-Sequence-Number: 7172 On Tue, 2008-09-23 at 09:13 -0400, Tom Lane wrote: > Simon Riggs writes: > > Thinks: Why not just sort all of the time and skip the debate entirely? > > The sort is demonstrably a loser for smaller indexes. Admittedly, > if the index is small then the sort can't cost all that much, but if > the (correct) threshold is some large fraction of shared_buffers then > it could still take awhile on installations with lots-o-buffers. The other realisation is that for large indexes, giving them more maintenance_work_mem probably will make them build faster 'cos we'll be sorting. So "give big indexes more memory" is still true *enough* to be broadly consistent, explainable and understandable. I do explain things in more detail on some courses, but pithy rules help busy people. -- Simon Riggs www.2ndQuadrant.com PostgreSQL Training, Services and Support From bruce@momjian.us Wed Sep 24 16:04:54 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id EDD7264FC1E for ; Wed, 24 Sep 2008 13:04:54 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 47490-08 for ; Wed, 24 Sep 2008 13:04:51 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from momjian.us (momjian.us [70.90.9.53]) by postgresql.org (Postfix) with ESMTP id 64FB264FC2A for ; Wed, 24 Sep 2008 13:04:51 -0300 (ADT) Received: (from bruce@localhost) by momjian.us (8.11.6/8.11.6) id m8OG4Mk21483; Wed, 24 Sep 2008 12:04:22 -0400 (EDT) From: Bruce Momjian Message-Id: <200809241604.m8OG4Mk21483@momjian.us> Subject: Re: hash index improving v3 In-Reply-To: <26331.1222175594@sss.pgh.pa.us> To: Tom Lane Date: Wed, 24 Sep 2008 12:04:22 -0400 (EDT) CC: Simon Riggs , "Jonah H. Harris" , Alex Hunsaker , Kenneth Marshall , Xiao Meng , Zdenek Kotala , pgsql-patches@postgresql.org X-Mailer: ELM [version 2.4ME+ PL124 (25)] MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="US-ASCII" X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/165 X-Sequence-Number: 7180 Can we consider this hash thread closed/completed? --------------------------------------------------------------------------- Tom Lane wrote: > Simon Riggs writes: > > Thinks: Why not just sort all of the time and skip the debate entirely? > > The sort is demonstrably a loser for smaller indexes. Admittedly, > if the index is small then the sort can't cost all that much, but if > the (correct) threshold is some large fraction of shared_buffers then > it could still take awhile on installations with lots-o-buffers. > > The other side of that coin is that it's not clear this is really worth > arguing about, much less exposing a separate parameter for. > > regards, tom lane > > -- > Sent via pgsql-patches mailing list (pgsql-patches@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-patches -- Bruce Momjian http://momjian.us EnterpriseDB http://enterprisedb.com + If your life is a hard drive, Christ can be your backup. + From simon@2ndQuadrant.com Wed Sep 24 16:22:50 2008 Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 2E0C964FC2D for ; Wed, 24 Sep 2008 13:22:50 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 52130-05 for ; Wed, 24 Sep 2008 13:22:47 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from outmail137173.authsmtp.com (outmail137173.authsmtp.com [62.13.137.173]) by postgresql.org (Postfix) with ESMTP id F2D5664FC25 for ; Wed, 24 Sep 2008 13:22:46 -0300 (ADT) Received: from mail-c188.authsmtp.com (mail-c188.authsmtp.com [62.13.128.25]) by punt6.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id m8OGMejE002267; Wed, 24 Sep 2008 17:22:40 +0100 (BST) Received: from [192.168.0.3] (85-211-71-126.dyn.gotadsl.co.uk [85.211.71.126]) (authenticated bits=0) by mail.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id m8OGMcnY028974; Wed, 24 Sep 2008 17:22:39 +0100 (BST) Subject: Re: hash index improving v3 From: Simon Riggs To: Bruce Momjian Cc: Tom Lane , "Jonah H. Harris" , Alex Hunsaker , Kenneth Marshall , Xiao Meng , Zdenek Kotala , pgsql-patches@postgresql.org In-Reply-To: <200809241604.m8OG4Mk21483@momjian.us> References: <200809241604.m8OG4Mk21483@momjian.us> Content-Type: text/plain Date: Wed, 24 Sep 2008 17:23:38 +0100 Message-Id: <1222273418.4445.599.camel@ebony.2ndQuadrant> Mime-Version: 1.0 X-Mailer: Evolution 2.12.0 Content-Transfer-Encoding: 7bit X-Server-Quench: 01d39fe9-8a55-11dd-aecc-001871e930f4 X-AuthRoute: OCdxZQATClZOTQEd DAteCiNZVAwpPBRK HVkIKg5MJUcNSQVJ NksafhtFagFbflxB HGQLW1xEUVp7W2F/ aAMfZQBDYEtPQQJr TklLRE1QEQdtHhxP WxZhJWQhKWxGenZ5 YkIsVnhTEkR7IUV0 FBtdCGVXYGJ9aWFL BF0JIlAHbQNKfxdC awV2V3NbZStlM3Bw LDcaAxsREA5qYCRc WQFFLFQeTFZDHzsk XRccHDMgVVNeL2Qg X-Authentic-SMTP: 61633235383639.cat.dmpriest.net.uk:1378/Kp X-Report-SPAM: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-Virus-Status: No virus detected - but ensure you scan with your own anti-virus system! X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/166 X-Sequence-Number: 7181 On Wed, 2008-09-24 at 12:04 -0400, Bruce Momjian wrote: > Can we consider this hash thread closed/completed? Please -- Simon Riggs www.2ndQuadrant.com PostgreSQL Training, Services and Support