X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (unknown [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id D365F529B3 for ; Wed, 20 Jul 2005 13:17:17 -0300 (ADT) Received: from svr1.postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 11254-02 for ; Wed, 20 Jul 2005 16:17:08 +0000 (GMT) Received: from wproxy.gmail.com (wproxy.gmail.com [64.233.184.193]) by svr1.postgresql.org (Postfix) with ESMTP id 7AB055281E for ; Wed, 20 Jul 2005 13:17:07 -0300 (ADT) Received: by wproxy.gmail.com with SMTP id i21so1472455wra for ; Wed, 20 Jul 2005 09:17:07 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=i3FpIplwzZagXyHrL/fYoRMmLi+Q0fMzSVdxMpn8bcrZgWQdZbrQsQSYOLQcF8a90F1V8iZgnSPOXQTgdb1e17VvmtgAUcZ76zIdxuHiMczuP99sRlJ+R6C28F76yjQ1OPldlobZub9FoHauADaHI7jZvwnSIw2wfCrteOIAsIU= Received: by 10.54.68.4 with SMTP id q4mr137747wra; Wed, 20 Jul 2005 09:16:26 -0700 (PDT) Received: by 10.54.120.11 with HTTP; Wed, 20 Jul 2005 09:16:26 -0700 (PDT) Message-ID: <59d991c405072009163b149809@mail.gmail.com> Date: Wed, 20 Jul 2005 12:16:26 -0400 From: Christopher Petrilli Reply-To: Christopher Petrilli To: Tom Lane Subject: Re: Impact of checkpoint_segments under continual load conditions Cc: Vivek Khera , pgsql-performance@postgresql.org In-Reply-To: <59d991c405071907482bb0689b@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline References: <59d991c4050717100874c08a86@mail.gmail.com> <59d991c405071811457ccdd3f1@mail.gmail.com> <16394.1121715156@sss.pgh.pa.us> <59d991c405071812342e290f57@mail.gmail.com> <16794.1121718743@sss.pgh.pa.us> <59d991c405071907482bb0689b@mail.gmail.com> X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.141 tagged_above=0 required=5 tests=AWL, RCVD_BY_IP X-Spam-Level: X-Archive-Number: 200507/336 X-Sequence-Number: 13577 On 7/19/05, Christopher Petrilli wrote: > It looks like the CVS HEAD is definately "better," but not by a huge > amount. The only difference is I wasn't run autovacuum in the > background (default settings), but I don't think this explains it. > Here's a graph of the differences and density of behavior: >=20 > http://blog.amber.org/diagrams/pgsql_copy_803_cvs.png >=20 > I can provide the raw data. Each COPY was 500 rows. Note that fsync > is turned off here. Maybe it'd be more stable with it turned on? I've updated this with trend-lines. Chris --=20 | Christopher Petrilli | petrilli@gmail.com