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copied!<p>I thought I'd share some settings that have worked for the server apps I've tuned in the past. These have been with Sun/Oracle JDK 6 (at the time of this writing). </p> <p>This is probably the most commonly used set of GC params. Of course, the settings depend heavily on the nature of your application - object life, allocation rates, complexity of refs/pointers etc. If your experience has been any different please share them.</p> <hr> <p>Basic settings. Min and max heap are the same. Assumes 64 bit machine. Heaps larger than 4-6g will require careful tuning and testing. 6g is not mandatory<br> <code>-server -Xms6g -Xmx6g -XX:MaxPermSize=256m</code></p> <p>Option A (Parallel collector): High throughput, batch oriented work. Noticable periodic pauses.<br> <code>-XX:+UseParallelGC</code></p> <p>Option B (CMS): Lower throughput, lower latency, continuous processing. Frequent unnoticable micro-pauses, rare long pauses.<br> <code>-XX:+UseParNewGC -XX:+ParallelRefProcEnabled -XX:+UseConcMarkSweepGC -XX:MaxGCPauseMillis=250 -XX:+CMSIncrementalMode -XX:+CMSIncrementalPacing -XX:+CMSParallelRemarkEnabled</code></p> <p>Additional monitoring during UAT/SAT/Pre-production. View this log using <a href="https://h20392.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=HPJMETER" rel="nofollow">HPJmeter</a> or <a href="http://www.tagtraum.com/gcviewer.html" rel="nofollow">GCViewer</a>.<br> <code>-verbose:gc -Xloggc:my_gc_output.hprof -XX:+PrintGCTimeStamps -XX:+PrintGCDetails</code></p> <hr> <p>Cheers!</p>

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