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From: Sebastian <news@seyweiler.dyndns.org>
Newsgroups: comp.lang.java.programmer
Subject: Re: method micro benachmarking with reflection
Date: Tue, 04 Aug 2015 21:44:12 +0200
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Am 30.07.2015 12:41, schrieb philipp.kraus.flashpixx@gmail.com:
> Hello,
>
> I have got a complex system and I would like to add some microbenchmarks to the application.
> So I need the runtime of a method call, but I don't want to add to each method a time counter. Can I add via reflection API a structure, that adds the micro benchmarks automatically? E.g.
>
> registerbenchmark( myclass.class, mymethod-handle ).
>
> This calls should do on any object
>
> myclass x = new myclass();
>
> timer start
> x.mymethod();
> timer stop
>
> So I would like to do register all classes & methods on the application startup and on any instance of a class the benchmark code should be run. So I need an event, which is called on each method call.
>
> Can I register an event-handler at the JVM to get each method call? Does there exists some frameworks for microbenchmarking?
>
> Hope for any comment, thanks a lot
>
> Phil
>
Nowadays, I shoould say, the accepted standard for microbenchmarking on 
the JVM is JMH. It's part of OpenJDK:

http://openjdk.java.net/projects/code-tools/jmh/

And it will become part of the standard, see JEP 230:

http://openjdk.java.net/jeps/230

It's also quite easy to use.

-- Sebastian