vetula: chris kelley’s blog

I’m doing some Java profiling of a Tomcat 5.5 webapp with HAT, The Java Heap Analysis Tool. Here’s some steps to make it work:

• Download HAT from http://hat.dev.java.net/.
• Open the Tomcat Monitor app, click configure, Java tab, and add the following line to Java Options: -Xrunhprof:file=dump.hprof,format=b,heap=all
• You may need to add more memory to Tomcat as well (Maximum memory pool).
• To launch it on the command-line:
  java -jar hat.jar -port 7002 “C:\Program Files\Apache Software Foundation\Tomcat 5.5\dump.hprof”
• If you run into memory problems w/ hat, give it more:
  java -XX:PermSize=128m -XX:MaxPermSize=128M -Xms700M -Xmx700M -jar hat.jar -port 7002 “C:\Program Files\Apache Software Foundation\Tomcat 5.5\dump.hprof”
• View the Hat webapp at http://localhost:7002/
• The docs included w/ the HAT download outline the capabilities of the HAT app pretty well.

This entry was posted on Sunday, June 4th, 2006 at 11:38 pm and is filed under General, Java. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.