JVM performance tuning for large applications

Question

The default JVM parameters are not optimal for running large applications. Any insights from people who have tuned it on a real application would be helpful. We are running the

Answer 1

I suggest you profile your application with CPU sampling and object allocation monitoring turned on at the same time. You will find you get very different results which can be helpful in tuning your code. Also try using the built in hprof profiler, it can give very different results as well.

In general profiling your application makes much more difference than JVM args.