Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1U8Mc2-0006b0-9X for pgsql-performance@arkaria.postgresql.org; Thu, 21 Feb 2013 03:14:22 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.72) (envelope-from ) id 1U8Mc1-0001vk-NI for pgsql-performance@arkaria.postgresql.org; Thu, 21 Feb 2013 03:14:21 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1U8Mc0-0001ve-Mq for pgsql-performance@postgresql.org; Thu, 21 Feb 2013 03:14:20 +0000 Received: from outmail149059.authsmtp.com ([62.13.149.59]) by magus.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1U8Mbw-0006G7-WB for pgsql-performance@postgresql.org; Thu, 21 Feb 2013 03:14:20 +0000 Received: from mail-c233.authsmtp.com (mail-c233.authsmtp.com [62.13.128.233]) by punt7.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id r1L3EEjp068424; Thu, 21 Feb 2013 03:14:14 GMT Received: from [192.168.47.109] (50-0-92-178.dsl.dynamic.sonic.net [50.0.92.178]) (authenticated bits=0) by mail.authsmtp.com (8.14.2/8.14.2/) with ESMTP id r1L3EBQt053299; Thu, 21 Feb 2013 03:14:12 GMT Message-ID: <51259102.9040707@agliodbs.com> Date: Wed, 20 Feb 2013 19:14:10 -0800 From: Josh Berkus Organization: PostgreSQL Experts Inc. User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 MIME-Version: 1.0 To: Scott Marlowe CC: pgsql-performance@postgresql.org Subject: Re: High CPU usage / load average after upgrading to Ubuntu 12.04 References: <60B572D9298D944580F7D51195DD30804357FA4ABF@VMBX125.ihostexchange.net> <511BE879.8080706@agliodbs.com> <511C2F10.3080409@agliodbs.com> <60B572D9298D944580F7D51195DD30804357FA4DE2@VMBX125.ihostexchange.net> <511D2F11.6040706@agliodbs.com> <60B572D9298D944580F7D51195DD308043580CAA0B@VMBX125.ihostexchange.net> <511D79FE.7060705@agliodbs.com> <60B572D9298D944580F7D51195DD308043580CAA87@VMBX125.ihostexchange.net> <511E7DC0.4090506@agliodbs.com> <5122C507.7060303@agliodbs.com> <5122FF50.8030903@catalyst.net.nz> <5123BB94.7030603@agliodbs.com> <512409AF.8010308@agliodbs.com> <512551D2.9090407@agliodbs.com> In-Reply-To: X-Enigmail-Version: 1.5 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Server-Quench: c47f34c4-7bd4-11e2-a49c-0025907707a1 X-AuthReport-Spam: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-AuthRoute: OCdyZgscClZXSx8a IioLCC5HRQ8+YBZL BAkGMA9GIUINWEQL c1AAdx19PVdbHwkA AHYLWF5VVFdwWi1w axRRcwxffEtJVxpo U1dJDBBTaAYdc31F BhsdUBB7OQFGfHY+ NkJlCHNfD0BnchQp RlNVFDgEeDZkYTMC UEBacgpUdwRKeU5E JDIqXmNmARBlEAUC Ojp7HzE+PX10EBkd XxoEIl9aBg4PGTcw DxkcEC8mEkBNTisv IgZuN0YTBk8dM0M9 eUcmEW8SLhkOF28W RhsLWHMx X-Authentic-SMTP: 61633136333939.1021:706 X-AuthFastPath: 0 (Was 255) X-AuthSMTP-Origin: 50.0.92.178/23 X-AuthVirus-Status: No virus detected - but ensure you scan with your own anti-virus system. X-Pg-Spam-Score: -2.6 (--) List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-performance Precedence: bulk Sender: pgsql-performance-owner@postgresql.org > Sounds to me like your IO system is stalling on fsyncs or something > like that. On machines with plenty of IO cranking up completion > target usuall smooths things out. It certainly seems like it does. However, I can't demonstrate the issue using any simpler tool than pgbench ... even running four test_fsyncs in parallel didn't show any issues, nor do standard FS testing tools. -- Josh Berkus PostgreSQL Experts Inc. http://pgexperts.com -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance