Date: Tue, 23 Sep 2003 17:17:49 -0400 From: Marc Ramirez <marc.ramirez@bluecirclesoft.com> To: Ulf Zimmermann <ulf@Alameda.net> Cc: freebsd-chat@freebsd.org Subject: Re: OT: Java gurus around ? Message-ID: <20030923211749.GA42904@www.bluecirclesoft.com> In-Reply-To: <20030923205520.GL5400@seven.alameda.net> References: <20030923205520.GL5400@seven.alameda.net>
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On Tue, Sep 23, 2003 at 01:55:20PM -0700, Ulf Zimmermann wrote: > Hello, > > a bit off topic but as we got so much bright heads here .... :-) > > The company I work for got a java application which uses Apache > and Tomcat 4x as application server. Also used is Javagroups to > provide session state between machines. So far this was run on > Solaris Sparc hardware and we have no seen the issues we see now > on Linux (baeh, I want to run FreeBSD /rude Oracle, require > Oracle 9i libs because of Oracle RAC, libs are being used > from Java to connect). > > On Linux we see the process of Java grow tremendous over the > size under Solaris. The bigger problem we see is that memory > does not seem to be freed. Garbage collection shows plenty of > activity but, the process size stays large and after running a > load test (which gets the process size high), then wait 30-40 > minutes, start another load test, the process size grows immediatly, > which indicates the old memory allocation isn't reused. So > something is keeping the memory in use, although not activily > touched (Linux starts to swap it out). > > Now what I am looking for is some form of memory allocation map > dump. Something which can tell us what objects maybe have things > allocated, so that I can give our developers some hints what > direction to look at. > > So, Java Gurus, any idea ? (me prays for a good answer). Your best bet is probably going to be something like JProbe. I've used it before on RedHat - pretty snazzy. Marc. -- Marc Ramirez Blue Circle Software Corporation 513-688-1070 (main) 513-382-1270 (direct) http://www.bluecirclesoft.com http://www.mrami.com (personal)
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