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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?
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java, that repeats a work unit of finding all prime numbers in a given integer range. It is a good example of CPU intensive process. Many Java applications are using the multithreading technology to run multiple processes of the same type concurrently instead of running them sequentially.
A JVM may max out on CPU usage because of the incoming workload. The server capacity may not be sized sufficiently to handle the rate of requests coming in and in such a situation, the Java application may be doing work, trying to keep up with the workload.
Use a profiler such as the jvisualvm that is bundled with jdk-1.6.0_10
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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.
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