Tomcat: Add Memory

sudo vi /usr/share/tomcat6/bin/catalina.sh

At the beginning of the file, after initial comment block add:

# setting JAVA_OPTS to perform
JAVA_OPTS="-Xms512m -Xmx1024m -XX:MaxPermSize=384m -Xss128k"

Restart tomcat:

sudo service tomcat6 restart