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From "Anand Narasimhan" <>
Subject Huge tomcat memory footprint
Date Mon, 01 Nov 2004 22:25:46 GMT
I am not able to determine if the problem is related to tomcat, solaris or
the application itself. Any help/pointers to debug the problem will be
greatly appreciated. 
The application runs on Solaris 2.8 using Sun's Java version 1.4.1_02. The
tomcat version is 4.1.27. The GUI is written using HTML/JSP/Struts 1.0.2.
The database is Oracle version 8.x (I think). The application also has API
interface written using Java/XML/Soap etc. The application is memory/CPU
intensive.  The problem I am having is,  after running under a large load,
tomcat process's memory footprint (reported by top command) increases
rapidly to more that 2G. The heap size (max configured to 1G), increases to
about 500 - 600M. I have tried running tomcat with optimizeit to see if
there are any memory leaks. optimizeit as wells as the output from GC
(running with -verbose:gc, -XX+PrintGCDetails) shows frequent garbage
collection activity and the heap size does not grow too much. 
I am not able to figure out why the process memory grows. If the heap is not
growing too much, what is consuming the memory?
Anand Narasimhan

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