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From Andrew Miehs <>
Subject Re: Tomcat causing high CPU load
Date Tue, 06 Nov 2007 09:57:01 GMT
Hi Bob,

Kill -3 <TOMCAT PID>

Will produce a stack trace in catalina.out

This problem is VERY most probably your code, and not tomcat, but a
stacktrace should show this.

ps auxwh

will also give you an indication, its probably just 1 thread pushing
you to such a high load.

As for "walking" through the code - don't forget this stuff is
multithreaded so its not so easy to walk through...

My bets are on an  unsynchronized HashMap.



On 05/11/2007, at 10:44 PM, Sai Bobba wrote:

> Many thanks. We've had several developers walk through the code to  
> try to
> catch the possibity that the app may be sitting in a loop in some
> situations. The code seems ok, and, as I indicated, we've never been  
> able to
> reproduce the situation. I've searched the web for taking thread  
> dumps, as I
> don't know how to do that, butg haven't been able to find anything.  
> Perhaps
> you could give me a pointer if you have the time.
> Thanks again for your attention.
> Bob

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