X-Original-To: pgsql-performance-postgresql.org@postgresql.org Received: from localhost (mx1.hub.org [200.46.208.251]) by postgresql.org (Postfix) with ESMTP id CF0659FA5CE for ; Tue, 13 Jun 2006 19:55:44 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.208.251]) (amavisd-new, port 10024) with ESMTP id 42379-03 for ; Tue, 13 Jun 2006 19:55:40 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey- Received: from projects.commandprompt.com (host-130.commandprompt.net [207.173.203.130]) by postgresql.org (Postfix) with ESMTP id 0F9D89FA38F for ; Tue, 13 Jun 2006 19:55:39 -0300 (ADT) Received: from [192.168.1.50] (or-67-76-146-141.sta.sprint-hsd.net [67.76.146.141]) (authenticated bits=0) by projects.commandprompt.com (8.13.6/8.13.6) with ESMTP id k5DMta8w015560; Tue, 13 Jun 2006 15:55:37 -0700 Message-ID: <448F4264.5030109@commandprompt.com> Date: Tue, 13 Jun 2006 15:55:32 -0700 From: "Joshua D. Drake" Organization: Command Prompt, Inc. User-Agent: Thunderbird 1.5.0.2 (X11/20060521) MIME-Version: 1.0 To: mischa@ca.sophos.com CC: pgsql-performance@postgresql.org Subject: Re: Solaris shared_buffers anomaly? References: <1150151282.14661.42.camel@tigger> <20060613000441.GI8588@kenobi.snowman.net> <20060613200810.GZ34196@pervasive.com> <448F3A6E.6080908@ca.sophos.com> In-Reply-To: <448F3A6E.6080908@ca.sophos.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: ClamAV version 0.88.2, clamav-milter version 0.88.2 on projects.commandprompt.com X-Virus-Status: Clean X-Greylist: Sender succeded SMTP AUTH authentication, not delayed by milter-greylist-1.6 (projects.commandprompt.com [192.168.2.159]); Tue, 13 Jun 2006 15:55:37 -0700 (PDT) X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200606/225 X-Sequence-Number: 19582 > Initially shared_buffers were set to 1000 (8MB). > Then, we moved all apps but the database server off the box. > > Raised shared_buffers to 2000 (16MB). > Modest improvement in some frequent repeated queries. > > Raised shared_buffers to 16000 (128MB). > DB server dropped to a CRAWL. Versions below 8.1 normally don't do well with high shared_buffers. 8.1 would do much better. If you dropped that to more like 6k you would probably continue to see increase over 2k. Sincerely, Joshua D. Drake -- === The PostgreSQL Company: Command Prompt, Inc. === Sales/Support: +1.503.667.4564 || 24x7/Emergency: +1.800.492.2240 Providing the most comprehensive PostgreSQL solutions since 1997 http://www.commandprompt.com/