Received: from maia.hub.org (unknown [200.46.208.211]) by mail.postgresql.org (Postfix) with ESMTP id 4F4B8632F00 for ; Wed, 7 Apr 2010 20:14:15 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.208.211]) (amavisd-maia, port 10024) with ESMTP id 47885-07 for ; Wed, 7 Apr 2010 23:13:58 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from polaris.pinpointresearch.com (cerberus.pinpointresearch.com [66.7.238.130]) by mail.postgresql.org (Postfix) with ESMTP id A7B27632872 for ; Wed, 7 Apr 2010 20:14:04 -0300 (ADT) Received: from betelgeuse.pinpointresearch.com (betelgeuse.pinpointresearch.com [192.168.1.179]) by polaris.pinpointresearch.com (Postfix) with ESMTP id 0CC86E00EC83; Wed, 7 Apr 2010 16:14:02 -0700 (PDT) Message-ID: <4BBD11B9.3040707@pinpointresearch.com> Date: Wed, 07 Apr 2010 16:14:01 -0700 From: Steve Crawford User-Agent: Thunderbird 2.0.0.24 (X11/20100317) MIME-Version: 1.0 To: Craig James CC: Tom Lane , pgsql-performance@postgresql.org Subject: Re: Occasional giant spikes in CPU load References: <4BBCFB12.1010306@emolecules.com> <8127.1270677548@sss.pgh.pa.us> <4BBD1033.9080905@emolecules.com> In-Reply-To: <4BBD1033.9080905@emolecules.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-2.068 tagged_above=-10 required=5 tests=AWL=0.531, BAYES_00=-2.599 X-Spam-Level: X-Archive-Number: 201004/81 X-Sequence-Number: 38331 >> ...Can you >> correlate the spikes with anything like that? > > Not that I know of. Just regular web traffic. On the backup server > these events happen occasionally even when there is little or no web > traffic, and nobody logged in doing maintenance. What, if anything, are you logging in the PostgreSQL logs? Anything interesting, there? Cheers, Steve