How to tune Tomcat 5.5 JVM Memory settings without using the configuration program

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Serhii’s suggestion works and here is some more detail.

If you look in your installation’s bin directory you will see catalina.sh
or .bat scripts. If you look in these you will see that they run a
setenv.sh or setenv.bat script respectively, if it exists, to set environment variables.
The relevant environment variables are described in the comments at the
top of catalina.sh/bat. To use them create, for example, a file
$CATALINA_HOME/bin/setenv.sh with contents

export JAVA_OPTS="-server -Xmx512m"

For Windows you will need, in setenv.bat, something like

set JAVA_OPTS=-server -Xmx768m

Hope this helps,
Glenn

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