Many thanks Ben I've similarly NOT YET seen the >90% CPU on a jdk1.4 and tomcat 4.1.12 system I set up with much the same webapps as the one that's "thrashing"
I noticed some old mailing list messages related to this problem that talked about garbage collection, and I had begun to wonder whether >90% CPU was a jdk problem rather than a tomcat problem and your experience supports this. Do you - or anyone else - know the pedigree of tomcat.exe? Is it basically JavaService? Also, has anyone any ideas how I might get -verbose:gc output from it? I can do this with catalina_opts for catalina.bat, but adding the -verbose:gc parameter to the registry key for the NT service doesn't seem to result in any output for -verbose:gc, though the -Xms64m and -Xrs parameters I've added do seem to be actioned. Thanks again Ben > -----Original Message----- > From: Ben Walding [mailto:ben@;walding.com] > Sent: 06 November 2002 07:14 > To: Tomcat Users List > Subject: Re: Tomcat NT Service hogs >90% CPU - intermittent problem > > > I had this problem at one point (4.1.10, and no IIS in my config though) > > My "solution" was to upgrade to 4.1.12 and upgrade the JDK to 1.4.1.01, > this seemed to work. > > No idea what caused it though. > > > Christopher Watson wrote: > > >Hello All, > > > >Currently my config is > > > >TOMCAT 4.1.12 > >jdk1.3.1_03 > >Windows 2000 Pro > >NT Service configured using the server\jvm.dll with -Xrs > >IIS 5.0 > >ISAPI_REDIRECTOR version 2.0 using workers.properties > > > >however I have had this problem many times with different tomcat > versions in > >the past. > > > >Suddenly, for no apparent reason - high load/ no load/ different webapps/ > >doesn't seem to make any difference ... > >tomcat.exe grabs >90% of cpu and won't let go of it. > >Nothing unexpected appears in the logs > > > >Has anyone seen this and know a way round it? > > > >Failing that, could they suggest any logging I could turn on (and how) to > >try and diagnose the problem. > > > >As I say, I've had it with various combinations of applications > in webapps. > >I THINK it ONLY happens with the NT Service tomcat.exe, > >I'm pretty sure I've not seen it by running catalina.bat > > > >Sometimes it happens if I restart the machine and leave it. > >Other times I may not encounter it for a couple of days. > >If I leave about a week, then it almost always turns up. > > > >Any help much appreciated . > > > >Christopher > > > > > >-- > >To unsubscribe, e-mail: > <mailto:tomcat-user-unsubscribe@;jakarta.apache.org> > >For additional commands, e-mail: > <mailto:tomcat-user-help@;jakarta.apache.org> > > > > > > > > > > > > > -- > To unsubscribe, e-mail: > <mailto:tomcat-user-unsubscribe@;jakarta.apache.org> > For additional commands, e-mail: > <mailto:tomcat-user-help@;jakarta.apache.org> > > -- To unsubscribe, e-mail: <mailto:tomcat-user-unsubscribe@;jakarta.apache.org> For additional commands, e-mail: <mailto:tomcat-user-help@;jakarta.apache.org>
