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Tomcat is especially memory hungry, and will benefit from being given lots of RAM. To set the amount of memory available to Tomcat, use either the JAVA_OPTS or CATALINA_OPTS environment variable, e.g:

Code Block
    JAVACATALINA_OPTS=-Xmx512m -Xms512m

OR

Code Block
    CATALINAJAVA_OPTS=-Xmx512m -Xms512m

The above example sets the maximum Java Heap memory to 512MB.

Info
titleDifference between JAVA_OPTS and CATALINA_OPTS

You can use either environment variable. JAVA_OPTS is also used by other Java programs (besides just Tomcat). CATALINA_OPTS is only used by Tomcat. So, if you only want to tweak the memory available to Tomcat, it is recommended that you use CATALINA_OPTS. If you set both CATALINA_OPTS and JAVA_OPTS, Tomcat will default to using the settings in CATALINA_OPTS.

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To increase the amount of PermGen memory available to Tomcat (default=64MB), use either the JAVA_OPTS or CATALINA_OPTS environment variable, e.g:

Code Block
    JAVACATALINA_OPTS=-XX:MaxPermSize=128m

OR

Code Block
    CATALINAJAVA_OPTS=-XX:MaxPermSize=128m

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