Java basics to learn JVM virtual machine parameter configuration

1) Set -Xms and -Xmx to be equal;

         2) Set NewSize and MaxNewSize equal;

         3) Set Heap size, PermGen space:

            Tomcat configuration example: modify %TOMCAT_HOME%/bin/catalina.bat or catalina.sh

            Add the following line above "echo "Using CATALINA_BASE: $CATALINA_BASE"":

Cmd code

1. set JAVA_OPTS=-Xms800m -Xmx800m -XX:PermSize=128M -XX:MaxNewSize=256m -XX:MaxPermSize=256m