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How to find CPU-intensive class in Java?

Asked 2010-06-01T19:08:15.750
15

I have a big program in Java that uses multithreading. In some cases, the program starts using 100% of three cores of my eight core system. In normal use, the program use all cores at 1-2%. How can I find the class that's overloading cores?

java performance multithreading class
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2 Answers

15

Use a profiler such as the jvisualvm that is bundled with jdk-1.6.0_10

answered 2010-06-01T19:11:16.957
6

The best solution is to use a profiler - that's what they're built for, and there's a great one bundled with Java 6.

Another (far from being as ideal a solution) is to run your program in the Eclipse IDE (if that's what you use) in debug mode. You can then look at the running threads. IF a lot of them are suspended, the one that is not might be your culprit. Force it to break (from the toolbar) and you can see where it is. There are many chances that you'll find a clear loop or busy waiting.

answered 2010-06-01T20:31:39.340

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