X-Original-To: pgsql-hackers-postgresql.org@postgresql.org Received: from localhost (mx1.hub.org [200.46.208.251]) by postgresql.org (Postfix) with ESMTP id 5F6069FA65C for ; Wed, 19 Jul 2006 12:35:50 -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 26452-04 for ; Wed, 19 Jul 2006 12:35:45 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey- Received: from noel.decibel.org (noel.decibel.org [67.100.216.10]) by postgresql.org (Postfix) with ESMTP id 2A7789FA47F for ; Wed, 19 Jul 2006 12:35:44 -0300 (ADT) Received: by noel.decibel.org (Postfix, from userid 1001) id 5730D56451; Wed, 19 Jul 2006 10:35:44 -0500 (CDT) Received: (hashcash-sendmail, from uid 1001); Wed, 19 Jul 2006 10:35:43 -0500 Date: Wed, 19 Jul 2006 10:35:42 -0500 From: "Jim C. Nasby" To: Katsuhiko Okano Cc: pgsql-hackers@postgresql.org Subject: Re: poor performance with Context Switch Storm at TPC-W. Message-ID: <20060719153542.GT83250@pervasive.com> References: <200607112009.FED09315.TLPPUBIBOPuVLJL@oss.ntt.co.jp> <20060711135951.GA3995@surnet.cl> <200607141457.CFC04165.PBLJLPVTILUBOPu@oss.ntt.co.jp> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200607141457.CFC04165.PBLJLPVTILUBOPu@oss.ntt.co.jp> X-Operating-System: FreeBSD 6.0-RELEASE-p4 amd64 X-Distributed: Join the Effort! http://www.distributed.net User-Agent: Mutt/1.5.11 X-Hashcash: 1:20:060719:okano.katsuhiko@oss.ntt.co.jp::ch8ggV/2MSoWf8s+:00000000 0000000000000000000000007z0W X-Hashcash: 1:20:060719:pgsql-hackers@postgresql.org::i2Bm3eACLx4jPHVx:000000000 00000000000000000000000047re X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200607/798 X-Sequence-Number: 86653 On Fri, Jul 14, 2006 at 02:58:36PM +0900, Katsuhiko Okano wrote: > NOT occurrence of CSStorm. The value of WIPS was about 400. > (but the value of WIPS fell about to 320 at intervals of 4 to 6 minutes.) If you haven't changed checkpoint timeout, this drop-off every 4-6 minutes indicates that you need to make the bgwriter more aggressive. -- Jim C. Nasby, Sr. Engineering Consultant jnasby@pervasive.com Pervasive Software http://pervasive.com work: 512-231-6117 vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461