Return-Path: Delivered-To: apmail-perl-modperl-archive@www.apache.org Received: (qmail 1592 invoked from network); 30 Mar 2009 11:46:42 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 30 Mar 2009 11:46:42 -0000 Received: (qmail 78596 invoked by uid 500); 30 Mar 2009 11:46:38 -0000 Delivered-To: apmail-perl-modperl-archive@perl.apache.org Received: (qmail 78563 invoked by uid 500); 30 Mar 2009 11:46:38 -0000 Mailing-List: contact modperl-help@perl.apache.org; run by ezmlm Precedence: bulk list-help: list-unsubscribe: List-Post: List-Id: Delivered-To: mailing list modperl@perl.apache.org Received: (qmail 78530 invoked by uid 99); 30 Mar 2009 11:46:38 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 30 Mar 2009 11:46:38 +0000 X-ASF-Spam-Status: No, hits=1.8 required=10.0 tests=MISSING_HEADERS,RCVD_IN_DNSWL_LOW,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (nike.apache.org: local policy) Received: from [195.173.77.150] (HELO lon1-post-3.mail.demon.net) (195.173.77.150) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 30 Mar 2009 11:46:29 +0000 Received: from fadetoblack.demon.co.uk ([80.176.158.205] helo=phoenix.fadetoblack.demon.co.uk) by lon1-post-3.mail.demon.net with esmtp (Exim 4.69) id 1LoFwM-0001MC-eZ for modperl@perl.apache.org; Mon, 30 Mar 2009 11:46:06 +0000 Received: from [10.13.0.103] (helo=localhost) by phoenix.fadetoblack.demon.co.uk with esmtp (Exim 4.69) (envelope-from ) id 1LoFwF-00020S-EN for modperl@perl.apache.org; Mon, 30 Mar 2009 12:46:05 +0100 Received: from localhost ([127.0.0.1]) by localhost with esmtp (Exim 4.69) (envelope-from ) id 1LoFwE-0002qF-9e for modperl@perl.apache.org; Mon, 30 Mar 2009 12:45:58 +0100 Message-ID: <49D0B0F4.9070303@fadetoblack.me.uk> Date: Mon, 30 Mar 2009 12:45:56 +0100 From: Carl Johnstone User-Agent: Thunderbird 2.0.0.21 (X11/20090319) MIME-Version: 1.0 CC: Mod_perl users Subject: Re: Profiling live mod_perl backends References: <66887a3d0903291334i139c9c39s16e8bdbcb5bba740@mail.gmail.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Checked: Checked by ClamAV on apache.org Cosimo Streppone wrote: > However, some bad problems start to be evident only with really > high req/s rate. Another possibility is that once you hit full load you're just pushing the server over the edge for what it can manage load-wise. Use your normal OS monitoring tools and ensure that you've not started to swap excessively or have two many CPU-bound requests. If it is the case, you'll probably find that you'll benefit from reducing the number of concurrent apache processes. Carl