From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 11109 invoked by alias); 1 Sep 2010 15:05:16 -0000 Received: (qmail 11035 invoked by uid 22791); 1 Sep 2010 15:05:15 -0000 X-SWARE-Spam-Status: No, hits=-6.0 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_HI,SPF_HELO_PASS,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Wed, 01 Sep 2010 15:05:10 +0000 Received: from int-mx08.intmail.prod.int.phx2.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.21]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o81F58Dp012371 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Wed, 1 Sep 2010 11:05:08 -0400 Received: from localhost.localdomain (vpn-10-216.rdu.redhat.com [10.11.10.216]) by int-mx08.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id o81F56JW000916 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 1 Sep 2010 11:05:07 -0400 Message-ID: <4C7E6BA2.2000008@redhat.com> Date: Wed, 01 Sep 2010 15:05:00 -0000 From: David Smith User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.8) Gecko/20100806 Fedora/3.1.2-1.fc13 Lightning/1.0b2pre Thunderbird/3.1.2 MIME-Version: 1.0 To: Ken McDonell CC: "Frank Ch. Eigler" , systemtap@sources.redhat.com Subject: Re: [pcp] suitability of PCP for event tracing References: <20100827153906.GD3185@redhat.com> <4C7A82D1.50602@internode.on.net> In-Reply-To: <4C7A82D1.50602@internode.on.net> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-IsSubscribed: yes Mailing-List: contact systemtap-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: systemtap-owner@sourceware.org X-SW-Source: 2010-q3/txt/msg00345.txt.bz2 On 08/29/2010 10:54 AM, Ken McDonell wrote: ... stuff deleted ... > As Nathan has suggested, if event traces are intended for retrospective > analysis (as opposed to event counters being suited for either real time > or retrospective analysis), then there is an alternative approach, > namely to create a PCP archive directly from a source of data without > involving pmcd or a pmda or pmlogger. We've recently reworked the > "pmimport" services to expose better APIs to support just this style of > use ... see LOGIMPORT(3) and sar2pcp(1) for an example. I think this > approach is possibly a better semantic match between PCP and a stream of > event records. Hmm. If I'm understanding all the acronyms correctly, I'm not seeing the benefit of using LOGIMPORT to create a PCP archive vs. involving pcmd/pmda/pmlogger. Could you expand here? Thanks. -- David Smith dsmith@redhat.com Red Hat http://www.redhat.com 256.217.0141 (direct) 256.837.0057 (fax)