Tomcat configuration

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Depending on which Tomcat version you installed, configuration files can be one in /var/tomcatX where X represents the version number.

You will find the server.xml file in /var/tomcatX/conf/.

You can configure various JVM options inside /var/tomcatX/bin/catalina.sh.

Java heap size

You can adjust Java heap size by changing JAVA_OPTS in catalina.sh file which is used to start the Tomcat service.

Be sure to include the m after the value.

-Xms: This option specifies the minimum heap size, it should be kept small; Default value: 16m

-Xmx: This option specifies the maximum heap size, it should be large enough to support your application needs

-XX:MaxPermSize: This is the amount of memory that is permanently allocated to tomcat for stuff that doesn't change often such as Java classes; Default value: 64m

Have in mind the amount of memory available to your VPS as the total amount of memory used by Tomcat will be MaxPermSize + Xmx