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Configure Tomcat Java JVM Memory, The Debian way

May 29, 2012 no comments Posted in Tutorial

Setting the JVM memory alocation for tomcat should be trivial in theory we only need to pass the :  -Xmx1024m parameter to JAVA_OPTS during tomcat startup. However that not the case. I’ve been looking for month how to change this Tomcat JVM paramater. Finally i got the answer tonight and i want to share my experience 🙂

Note : This was intended to use with the tomcat that come with ubuntu bundle (apt-get install tomcat)

In Debian the JAVA_OPTS paramater we need to change is located in this file /etc/default/tomcatX.X.

Change the JAVA_OPTS with this parameter :

JAVA_OPTS=”-Djava.awt.headless=true -Xmx1024m -XX:MaxPermSize=256m”

-Xmx : Set the maximal heap memory alocated for a tomcat server, a low value of this parameter can lead to OutOfMemoryExceptions.

-XX:MaxPermSize : The PermGen space is used for things that do not change (or change often). e.g. Java classes

The thing that we must be aware of is that both -Xmx and -XX:MaxPermSize  takes different memory alocation. So if in the example we put 1024 Mb on Heap space and 256 Mb on PermGen we allowed a total of 1024 + 256 to be alocated on a single tomcat Instance.

After change these setting we can restart tomcat.

If we want to make sure that the setting is taking effect ,  we can make a simple servlet which check the memory parameter using this code :

Hope thats help !

Reference :

http://rimuhosting.com/knowledgebase/linux/java/-Xmx-settings

http://codintips.blogspot.com.au/2010/01/add-more-jvm-memory-in-tomcat-on-ubuntu.html

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