I was wondering if there somebody knows if there are some 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?
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