From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 17676 invoked by alias); 7 Aug 2012 11:50:50 -0000 Received: (qmail 17666 invoked by uid 22791); 7 Aug 2012 11:50:48 -0000 X-SWARE-Spam-Status: No, hits=-7.0 required=5.0 tests=AWL,BAYES_00,KHOP_RCVD_UNTRUST,KHOP_THREADED,RCVD_IN_DNSWL_HI,RCVD_IN_HOSTKARMA_W,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; Tue, 07 Aug 2012 11:50:34 +0000 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q77BoX9R022773 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 7 Aug 2012 07:50:33 -0400 Received: from springer.wildebeest.org (ovpn-113-77.phx2.redhat.com [10.3.113.77]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id q77BoVud018794 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 7 Aug 2012 07:50:32 -0400 Received: by springer.wildebeest.org (Postfix, from userid 500) id 419804B3BC; Tue, 7 Aug 2012 13:50:31 +0200 (CEST) Message-ID: <1344340231.2974.76.camel@springer.wildebeest.org> Subject: Re: [RFC] Enhanced Garbage Collection Probe Points From: Mark Wielaard To: Lukas Berk Cc: systemtap@sourceware.org, distro-pkg-dev@openjdk.java.net Date: Tue, 07 Aug 2012 11:50:00 -0000 In-Reply-To: <20120803142250.GA29771@redhat.com> References: <20120802131039.GA1955@redhat.com> <1344002142.2906.24.camel@springer.wildebeest.org> <20120803142250.GA29771@redhat.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 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: 2012-q3/txt/msg00171.txt.bz2 On Fri, 2012-08-03 at 10:22 -0400, Lukas Berk wrote: > * Mark Wielaard [2012-08-03 09:56]: > > On Thu, 2012-08-02 at 09:10 -0400, Lukas Berk wrote: > > They look interesting, but do you have some example usage for this? My > > garbage collector knowledge is very rusty. Just some simple description > > when which point would be hit and what interesting data can be > > collected/analysed at that time would be nice to put this in context. > I ran a $stap eventcount.stp hotspot.gc_* -o eventcount.txt style script > and have attached the output. I'll also start to document the > script(tapset?) I've been using to interpret the probe points I've been > added here. If you could post eventcount.stp with some comments that would be really helpful (even if it is just a work in progress) to better understand the "meaning" of the new probe points for a Garbage Collector noob like me. Thanks, Mark