[jboss-user] [Performance Tuning] - Re: Interpreting GC verbose data for JBoss Server

[Peter Johnson]

Peter Johnson [https://community.jboss.org/people/peterj] created the discussion

"Re: Interpreting GC verbose data for JBoss Server"

To view the discussion, visit: https://community.jboss.org/message/723347#723347

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For suggestions on how to gather GC data and analyze it, see these white papers:
Java Garbage Collection Statistical Analysis 101
Java Garbage Collection Performance Analysis 201
at  http://www.cmg.org/cgi-bin/search.cgi?q=java+peter+johnson&x=30&y=10 http://www.cmg.org/cgi-bin/search.cgi?q=java+peter+johnson&x=30&y=10

Which version of the JVM are you using? If earlier than 1.6, you should also set the young generation size. I recommend about 1/3 to 1/4 the heap size, so 1g should be about right (see the white papers for details).

The full GC every 2 minutes seems to indicate that there is a thread that runs every two minutes and calls Syste,.gc(). I assume that once you set -XX:+DisableExplicitGC that you no longer see the full GCs every two minutes.
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