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From "Caldarale, Charles R" <Chuck.Caldar...@unisys.com>
Subject RE: tomcat 5.0.28 - CPU spikes after heap memory reaches 700MB
Date Tue, 30 Aug 2005 17:23:14 GMT
> From: Bhaskar Mulpuri [mailto:tadmin@bnss.com] 
> Subject: tomcat 5.0.28 - CPU spikes after heap memory reaches 700MB
> 
> When the heap memory for the tomcat process reaches 700 Mb 
> (as shown by solaris top command), for a few requests, the 
> CPU spikes to 90-95 %.

Is it possible that the application is getting an OOME, catching it, and
simply retrying the request?  This would account for the high CPU
utilization, and GC won't do much if nothing's changed since the last
attempt.  Since OOME covers a variety of resource exhaustions besides
the primary Java heap, you might well be running out of file handles,
filling up the permanent generation, hitting max threads (unlikely), or
???

 - Chuck


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