Tomcat Java Options

This is aimed at a production Tomcat running Fedora, GSearch and Solr.

• All Versions
  • at least 1 gig minimal memory -Xms1000m
  • a use-case sensitive max memory, usually no more than half of available physical memory so as to not starve other applications -Xmx4000m
• 1.7
  • PermGen -XX:MaxPermSize=512m -XX:+CMSClassUnloadingEnabled
• 1.8
  • PermGen has been removed so no longer use PermGen effecting options.
• Multiple processors
  • Single threaded GC can't keep up so use -XX:+UseParallelOldGC