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From "Thomas Nybro Bolding" <>
Subject Vedr.: Garbage Collection issues
Date Mon, 01 Dec 2003 07:09:11 GMT
Without knowing your system setup especially JDK version, RAM and # of 
processors my guess is that it could be due to an undersized heap and a 
high call-setup rate.
If the pressure on the old collector is heavy enough, it can force the old 
collector to revert to the traditional mark-sweep collector. If the old 
collector is still unable to keep up, the system can begin to thrash, and 
finally, throw an out-of-memory exception.
Start Tomcat with verbose/xloggc to profile your applications.


"Neal" <>
01-12-03 02:21
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        Vedr.:  Garbage Collection issues

My Tomcat 4.1 (hosted on Linux) seems to have a problem in recent months
with crashing due to unavailable free RAM.  Specifically I get a
java.error.outOfMemory exception.  If check the RAM available
(Runtime.getRuntime().totalMemory()), I can see it ticking down through
the week.  If explicitly run garbage collection however my RAM totally
frees up and all is well (Runtime.getRuntime().gc();).

Why would this happen?  Surely this isn't due to a programming error on
my part, otherwise, the resources should automatically released whenever
the JRE performs periodic garbage collection. Isn't that correct?
Anyone have any theories as to what this may mean and what the best
solution would be?


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