Versions Compared

Old Version 26

changes.mady.by.user Chris Welford

Saved on

compared with

New Version 27

changes.mady.by.user Chris Welford

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...

Option

Recommended Setting

Syntax

Initial Memory Pool

1024Mb on 32bit architecture. 40% of physical memory on x64 architecture. Consult your sys admin for recommended settings on virtual servers.

-Xms1024m

Max Memory Pool

As much as possible. 1024Mb on 32bit architecture. 75% of physical memory on x64 architecture. Consult your sys admin for recommended settings on virtual servers.

-Xmx1024m

Max PermGen Memory Pool

150Mb on 32bit. 1024Mb on x64.

-XX:MaxPermSize=150m

Garbage Collector Diagnostics

Enabled

-verbose:gc

...


To set JVM options:

Windows

  • Run the Tomcat Monitor
  • Open the Tomcat Monitor system tray Configure … menu
  • Select the Java tab
  • Set the Initial memory Pool (see table above)
  • Set the Max Memory Pool (see table above)
  • Add the following lines to the Java Options scrollable field:
Code Block
-XX:MaxPermSize=150m
-verbose:gc
-Djava.awt.headless=true

Unix/Linux

If you have installed the scripts in tomcat login scripts, these option will already be set however for clarity, these options are defined in the JAVA_OPTS environment variable set in the tomcat user’s shell startup file (e.g. .profile / .bash_profile / .cshrc in the user’s home directory – the actual startup file is determined by the user’s default shell settings).

Code Block
JAVA_OPTS=’-Xms1024m -Xmx1024m -XX:MaxPermSize=150m -verbose:gc -Djava.awt.headless=true’

...