What is optimum thread pool size for simple program running cpu based tasks in Java

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If you have CPU bound tasks, as you increase the number of threads you get increasing overhead and slower performances. Note: having more threads than waiting tasks is just a waste of resources, but may not slow down the tasks so much.

I would use a multiple (e.g. 1 or 2) of the number of cpus rather than adding just one as having one too many threads can have a surprising amount of overhead.

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