Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1U7avl-0003CY-BC for pgsql-performance@arkaria.postgresql.org; Tue, 19 Feb 2013 00:19:33 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.72) (envelope-from ) id 1U7avk-0003ym-S1 for pgsql-performance@arkaria.postgresql.org; Tue, 19 Feb 2013 00:19:32 +0000 Received: from makus.postgresql.org ([2001:4800:7903:4::125]) by malur.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1U7avk-0003yh-1k for pgsql-performance@postgresql.org; Tue, 19 Feb 2013 00:19:32 +0000 Received: from outmail148141.authsmtp.net ([62.13.148.141]) by makus.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1U7avh-0006Wa-Db for pgsql-performance@postgresql.org; Tue, 19 Feb 2013 00:19:31 +0000 Received: from mail-c232.authsmtp.com (mail-c232.authsmtp.com [62.13.128.232]) by punt12.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id r1J0JSPu038934 for ; Tue, 19 Feb 2013 00:19:28 GMT Received: from [172.47.23.103] (70-36-143-10.dsl.dynamic.sonic.net [70.36.143.10]) (authenticated bits=0) by mail.authsmtp.com (8.14.2/8.14.2/) with ESMTP id r1J0JPuV014713 for ; Tue, 19 Feb 2013 00:19:26 GMT Message-ID: <5122C507.7060303@agliodbs.com> Date: Mon, 18 Feb 2013 16:19:19 -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: pgsql-performance@postgresql.org Subject: Re: High CPU usage / load average after upgrading to Ubuntu 12.04 References: <60B572D9298D944580F7D51195DD30804357FA4ABF@VMBX125.ihostexchange.net> <60B572D9298D944580F7D51195DD30804357FA4B60@VMBX125.ihostexchange.net> <60B572D9298D944580F7D51195DD30804357FA4C11@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> In-Reply-To: X-Enigmail-Version: 1.5 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Server-Quench: 05386886-7a2a-11e2-b10b-0025903375e2 X-AuthReport-Spam: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-AuthRoute: OCdyZgscClZXSx8a IioLCC5HRQ8+YBZL BAkbIhBDJB8RWB5f NVxfJ1xYPXUEQkpF VCReGBUITgIzDi10 YhUnOFdCYEpPXBVq UEJIS1hQEktvAQIC AAAfVhpsdgVZen1v ZQggXwpbJiQ/E0Z8 RklVFiMHYm9iJmAa U0hefwtSbQQbfE5Y a1EqVm5fYGVVe3pg RVJiZ2tqYmhScjJv T1NFHmo/e2gsJBsJ DzADEjVnNnU4Dzgo JhMrYhlUGEEYPg07 L1Y7UF0VexYcFgBE V1xVDzVQK1gHSGI3 CktnV1MYDCA/CX4G REV0SgAA X-Authentic-SMTP: 61633136333939.1019:706 X-AuthFastPath: 0 (Was 255) X-AuthSMTP-Origin: 70.36.143.10/23 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 So, our drop in performance is now clearly due to pathological OS behavior during checkpoints. Still trying to pin down what's going on, but it's not system load; it's clearly related to the IO system. Anyone else see this? I'm getting it both on 3.2 and 3.4. We're using LSI Megaraid. -- 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