Hi all,
I am experiencing problems with memory management. I load up my app in 10 or 15 browsers where various stuff is put on a session each time. In Windows Task Manager I can see java.exe incrementing by an amount of memory for each browser/app opened. No problem there. In my web.xml I define <session-timeout> to be 2 minutes. Why after an inactive period of time exceeding 2 minutes, does the memory being used not appear to lessen please? In fact, even I close all browsers the memory being consumed remains at its peak...until a server restart is necessary.
I'm dismayed that this topic keeps coming up ... it really should die.
There is not a 1-1 correspondence between the memory that you see your task manager report and the amount of actual memory being "consumed" by your app. It's a problem of perspective -- from the operating system's perspective, the consumer is the java JVM. From your perspective, the consumer is your webapp. When Tomcat requests more memory, the JVM in turn requests more memory from the OS. Just because Tomcat releases memory doesn't mean that the JVM does. You can't use the Task Manager to (reliably) measure your webapp's memory consumption.
There is plenty of information about this in the archives or by reading up on JVM memory management for whatever vendor/platform you're running on.
justin
______________________________________________ Justin Ruthenbeck Software Engineer, NextEngine Inc. justinr - AT - nextengine DOT com Confidential. See: http://www.nextengine.com/confidentiality.php ______________________________________________
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