Hello Everyone,
I am writing about this error from yesterday. I used JProfiler to monitor my memory usage. And am now sure that each and every static object is trashed when the application is undeployed and the profiler shows that memory is free and all instance of the objects are GC'd. This works on a Windows 2000 setup of Tomcat 5.0.25 with Java 2 SDK version 1.4.2_04 and Ant 1.6.1, but fails miserably on GNU Linux 2.4.20-8 setup. this happens with both tomcat 5.0.25 and 5.0.27
Any ideas why something like this could be happening.
Nandish Rudra ECI Conference call Service LLC.
-----Original Message----- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: Monday, August 09, 2004 1:35 PM To: Tomcat Users List Subject: RE: Memory Usage - Tomcat 5.0.25
Hi, I have a couple of ideas. One is that your webapp maintain static or shared references to objects that prevent them from being garbage collected, and therefore memory from returning to the heap. Another is that a webapp undeploy is not guaranteed to reclaim all memory used by the webapp anyways so to count on this behavior is not smart. It is expected that every time you reload your webapp the overall memory usage of the server will go up a bit, as not all objects are gone (for example, if you have a static reference than the old classloader and anything that references it strongly will remain in memory).
Yoav Shapira Millennium Research Informatics
-----Original Message----- From: Nandish Rudra [mailto:[EMAIL PROTECTED] Sent: Monday, August 09, 2004 1:17 PM To: Tomcat Users List (E-mail) Subject: Memory Usage - Tomcat 5.0.25
Hello,
I am having some memory issues while deploing/undeploying web
applications
to Tomcat. I am using Tomcat 5.0.25 with Java 2 SDK version 1.4.2_04
and
Ant 1.6.1 on GNU Linux 2.4.20-8. I use ant to compile my web application
and
Tomcat's catalina-ant.jar to deploy it automatically.
Here is my problem. When I undeploy/remove an application, Tomcat does
not
reclaim the memory being used by the web application and when the application is re-deployed/re-installed a significant increase in
memory is
seen. This increase is obviously the memory usage by the new instance
of
the web application.
Does anyone have any idea as to why this is happening?
Try looking at jvmstat (http://developers.sun.com/dev/coolstuff/jvmstat/)
My own tests with show that its the permanent space of objects that gets filled up and not reclaimed after each reload.
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