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I’m exploring the possibility of running a Java app on a machine with very large amounts of RAM (anywhere from 300GB to 15TB, probably on an SGI Altix 4700 machine), and I’m curious as to how Java’s GC is likely to perform in this scenario.
I’ve heard that IBM’s or JRockit’s JVMs may be better suited to this than Sun’s. Does anyone know of any research or data on JVM performance in this situation?
On the Sun JVM, you can use the option -XX:UseConcMarkSweepGC to turn on the Concurrent mark and sweep Collector, which will avoid the ‘stop the world’ phases of the default GC algorithm almost completely, at the cost of a little bit more overhead.
The advise to use more than on VM on such a machine is IMHO outdated. In real world applications you often have enough shared data so that the performance with the CMS and one JVM is better.