Java Virtual Machines (JVM) and their performance comparison

I was wondering if there somebody knows if there are some 开发者_高级运维benchmarks which compare the following jvms.

sun jvm vs. openjdk jvm vs. rockit jvm vs. j9 jvm vs. apache harmony.

Which one is has the best performance?

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The answer really depends on a number of your application characteristics. See here for an example: http://jmob.ow2.org/jvm.html

To get an idea of some common criteria, try Googling: jvm performance benchmark

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This one is pretty recent.

NOTE: Of course benchmarks are just that, a limited set of canned routines. They really do not give you a real view of the picture

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The answer is very hard, considering each JVM has different strengths and weaknesses.

I would look to the SPEC benchmarks - SPECjbb2005 & SPECjEnterprise2010 - they are current, peer reviewed and actively run by many companies (unlike the jmob.ow2.org benches, which were vaguely current in the Pentium 3 era!).