SysteMajik Consulting

Tag: java

  • Tuning Java Garbage Collection

    I recently completed a garbage collection exercise on a variety of applications. In all, twenty WebLogic application clusters were tuned. A dozen of these are large busy application clusters. These provide a mix of Web Applications and Web Services.

    Tuning garbage collection is a matter of trade-offs. Large heaps take longer to garbage collect. Small heaps need to be collected frequently using more CPU time.

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  • Disable TraceClassUnloading in Java 6

    I recently discovered logs filling up with log messages for classes being unloaded during garbage collection. After a little research, I found that the TraceClassUnloading switch gets turned on by the Xloggc switch. After a little testing, I found that this can be resolved by adding the argument -XX:-TraceClassUnloading after the -Xloggc argument.

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