Performance profiler for a java application

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I need to optimise a Java application. It makes some 3rd party calls. I need some good tool to accurately measure the time taken by individual API calls. To give an idea of complexity- the application takes a data source file containing 10 lakh rows, and it takes around one hour to complete the processing. As a part of processing , it makes some 3rd party calls (including some network calls). I need to identify which calls are taking more time then others, and based on that, find out a way to optimise the application. Any suggestions would be appreciated. java performance profiling share|improve this question edited Jan 28 '11 at 18:05 aioobe 132k16247384 asked Jun 14 '10 at 7:31 Nitin Garg 7321933

Duplicate of stackoverflow.com/questions/2153409/… –  b.roth Jun 14 '10 at 7:46

7 Answers

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I can recommend JVisualVM. It's a great monitoring / profiling tool that is bundled with the Oracle/Sun JDK. Just fire it up, connect to your application and start the CPU-profiling. You should get great histograms over where the time is spent. Getting Started with VisualVM has a great screen-cast showing you how to work with it. Screen shot: Another more rudimentary alternative is to go with the -Xprof command line option: -Xprof Profiles the running program, and sends profiling data to standard output. This option is provided as a utility that is useful in program development and is not intended to be be used in production systems. share|improve this answer edited Jan 28 '11 at 18:04 answered Jun 14 '10 at 7:45