Vinay R's List: performance tuning

• -XX:+UseConcMarkSweepGC

    

  Tells JVM to use CMS in tenured gen.

    

  Fix the size of your heap: -Xmx2048m -Xms2048m This prevents GC from having to do things like grow and shrink the heap.

    

  -XX:+UseParNewGC

• -XX:ParallelCMSThreads=X

    

  set the number of threads that CMS will use when it is doing things that can be done in parallel.

    

  -XX:+CMSParallelRemarkEnabled remark is serial by default, this can speed you up.

    

  -XX:+CMSIncrementalMode allows application to run more by pasuing GC between phases

    

  -XX:+CMSIncrementalPacing allows JVM to figure change how often it collects over time

    

  -XX:CMSIncrementalDutyCycleMin=X Minimm amount of time spent doing GC

    

  -XX:CMSIncrementalDutyCycle=X Start by doing GC this % of the time

    

  -XX:CMSIncrementalSafetyFactor=X
• -XX:CMSFullGCsBeforeCompaction=1
• -XX:+CMSClassUnloadingEnabled

2 more annotations...