X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by postgresql.org (Postfix) with ESMTP id 825BD9DC943 for ; Wed, 1 Feb 2006 08:15:11 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 31990-06 for ; Wed, 1 Feb 2006 08:15:14 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey- Received: from vms044pub.verizon.net (vms044pub.verizon.net [206.46.252.44]) by postgresql.org (Postfix) with ESMTP id 5B5519DC942 for ; Wed, 1 Feb 2006 08:15:08 -0400 (AST) Received: from osgiliath.mathom.us ([70.108.47.21]) by vms044.mailsrvcs.net (Sun Java System Messaging Server 6.2-4.02 (built Sep 9 2005)) with ESMTPA id <0IU0005WKCPBP0U1@vms044.mailsrvcs.net> for pgsql-performance@postgresql.org; Wed, 01 Feb 2006 06:15:12 -0600 (CST) Received: from localhost (localhost [127.0.0.1]) by osgiliath.mathom.us (Postfix) with ESMTP id 33D686EA7E for ; Wed, 01 Feb 2006 07:15:10 -0500 (EST) Received: from osgiliath.mathom.us ([127.0.0.1]) by localhost (osgiliath.home.mathom.us [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 05038-04-3 for ; Wed, 01 Feb 2006 07:15:09 -0500 (EST) Received: by osgiliath.mathom.us (Postfix, from userid 1000) id 8555E6EA81; Wed, 01 Feb 2006 07:15:09 -0500 (EST) Date: Wed, 01 Feb 2006 07:15:09 -0500 From: Michael Stone Subject: Re: Huge Data sets, simple queries In-reply-to: <1138766980.14051.24.camel@noodles> To: pgsql-performance@postgresql.org Mail-followup-to: pgsql-performance@postgresql.org Message-id: <20060201121507.GB1293@mathom.us> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii; format=flowed Content-disposition: inline X-Pgp-Fingerprint: 53 FF 38 00 E7 DD 0A 9C 84 52 84 C5 EE DF 7C 88 X-Virus-Scanned: Debian amavisd-new at mathom.us References: <1138766980.14051.24.camel@noodles> User-Agent: Mutt/1.5.11 X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, score=0.109 required=5 tests=[AWL=0.109] X-Spam-Score: 0.109 X-Spam-Level: X-Archive-Number: 200602/11 X-Sequence-Number: 16997 On Tue, Jan 31, 2006 at 08:09:40PM -0800, Jeffrey W. Baker wrote: >I think I've proved my point. Software RAID1 read balancing provides >0%, 300%, 100%, and 100% speedup on 1, 2, 4, and 8 threads, >respectively. In the presence of random I/O, the results are even >better. Umm, the point *was* about single stream performance. I guess you did a good job of proving it. >Anyone who thinks they have a single-threaded workload has not yet >encountered the autovacuum daemon. On tables where my single stream performance matters you'd better believe that the autovacuum daemon isn't running. Mike Stone