Memory settings

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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


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
  • Klik OK


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


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 in something like: /usr/share/tomcat6/bin

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

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

Setting values in Tomcat 7 / Linux

  sudo nano /etc/tomcat7/tomcat7.conf

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"