Memory settings

The following sample sets

• PermGen space is set to 256 MB
• Minimum application memory is 512 MB
• Maximum application memory is 1 GB

Max total memory in this setup is 1280 MB which will work just fine in most cases

-Xmx512m -Xms1024m -XX:MaxPermSize=256m

In very memory constrained environments (server <= 1GB) use the following settings, with a max use of 512 mB

-Xmx384m -Xms384m -XX:PermSize=128m -XX:MaxPermSize=128m

Setting values in Tomcat / Windows

Tomcat6

The service can be changed by

• Open prompt as Administrator
• Run the following commands

  cd "C:\Program Files\Apache Software Foundation\Tomcat 6.0\bin
  Tomcat6w.exe //ES//tomcat6

• Klik "Java" page
• Set the values
  • Initial memory pool (aka "Xms"): 512m
  • Maximum memory pool (aka "Xmx"): 1024m
  • Add an extra line to Java Options

 -XX:MaxPermSize=256m

• Klik OK

Tomcat7

As Tomcat 6 except for step 2

  cd "C:\Program Files\Apache Software Foundation\Tomcat 7.0\bin
  Tomcat7w.exe //ES//tomcat7

See the visual guide here

http://plavc.wordpress.com/2012/02/08/tomcat-service-on-windows/

Tomcat8

As Tomcat 7 except for step 2

  cd "C:\Program Files\Apache Software Foundation\Tomcat 8.5\bin
  Tomcat8w.exe //ES//tomcat8

Setting values in Tomcat 6 / Linux

Find catalina.sh in something like: /usr/share/tomcat6/bin

Assign following line to JAVA_OPTS variable and add it into catalina.sh file.

 JAVA_OPTS="-Djava.awt.headless=true -server -Xmx512m -Xms1024m -XX:MaxPermSize=256m"

Setting values in JBoss 7.x / Windows

1. Edit [JBoss home]\bin\standalone.conf.bat
2. Ensure the following value is present

 set "JAVA_OPTS= -Xmx512m -Xms1024m -XX:MaxPermSize=256m"