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From "Shapira, Yoav" <>
Subject RE: CPU usage 100%
Date Tue, 09 Sep 2003 17:50:27 GMT

The SIGQUIT works for me even when CPU usage is 100%, so it's strange it
doesn't work for you. (I'm on solaris though).

One important thing to check is your JSP page; make sure you have no
infinite loops or other such locks in the page.

Yoav Shapira
Millennium ChemInformatics

>-----Original Message-----
>From: Ravi Puthiyattil []
>Sent: Tuesday, September 09, 2003 1:36 PM
>Subject: CPU usage 100%
>Hi all,
>  I am running Tomcat 4.1 on HPUX11.11, jdk1.4.1 running a small jsp
>Tomcat hangs with 100% cpu after some time. I tried to do a kill
>-SIGQUIT on the process, but there is no trace dump. Trace dump works
>only when the cpu is not at 100% (or when tomcat is running
>normally). I tried using glance and checked all the threads, most of
>the threads are in wait state SYSTEM and 3 threads are in wait state
>SLEEP. These 3 threads are the ones that have high CPU time.
>  I notice this behaviour even when no body is accessing web page. So
>it looks like when it is idle for a while the CPU usage goes 100%.
>  I don't know how to debug next. I need some help in finding out why
>and where the CPU goes nuts. Is there anything i need to change in
>the config files ? Please help.
>Thanks in advance,
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