How to change the Java virtual machine memory?

In ''xwsInstall2.2\Synchrony_4.0.0\WebServices_V2.2.0\server\bin'':

In ''xws_server.cmd''

If "%1"=="start" start java -Xms192m -Xmx512m -cp "%CLASSPATH%" LauncherBootstrap xws_server %*

and also in ''launcher.xml'':

<jvmarg value="-Xms192m" />

<jvmarg value="-Xmx512m" />

Put there bigger values