How to benchmark internal implementation of one java method?

Question

I have been using jmh for few months, and it is a great framework, that gives out the measurement of different java methods.

Now what I would like to know is within that same method, that I have benchmarked with jmh , I would like for x ns/op , to know how much of this x was spent in native calls, and how much was spent in scheduling, etc...

I am not sure if there is a tool to do that.

Answer 1

Maybe following link is some what closer http://docs.oracle.com/javase/7/docs/technotes/samples/hprof.html you can find help info with command java -agentlib:hprof=help . But still it wont give you the time spent in scheduling, switching etc.

Answer 2

What you are likely looking for is a profiler to give you the performance. I know on tool offhand that would be able to accommodate your request, however I am certain there is a number of Java profilers out there that could work for you just as well.

https://code.google.com/a/eclipselabs.org/p/jvmmonitor/