Configure Tomcat Java JVM Memory, The Debian way


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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

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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 :