Question by IgorAherne · Jan 07, 2014 at 03:50 AM · threading thread maximum

Maximum number of threads

Hello guys!

I heard somewhere, that the maximum number of threads in my application is (real cores)*2 for max performance if cores are hyper threaded. That is 1 for each virtual core. But, then there is a question, - system already runs about 500 threads, and who guarantees that my threads will be spread evenly across the processors? Why can't I go for 10 threads for example on a quad code processor if I have 10 heavy computation, separate tasks?

Thank you!

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iwaldrop · Jan 07, 2014 at 07:01 AM 1

The processor will never be executing more than cores*2 threads at any given time, even if more than that are allocated. As stated, max performance allows this many to be running concurrently. Others will be suspended until execution time (i.e. a core) is available. See this wikipedia page for more info.