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a program has many threads,but only 4~5 threads running at a time,so does it hurt performace?

pango
Beginner
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my program create 400~500 threads at startup,but only 4~5 threads running at a time,other threads is blocked by calling WaitForSingleObject(),so does such a program hurt the performance of system?
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TimP
Black Belt
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Unless you are asking how Vtune might be used to check the performance, you might be interested in the Threading Forum and discussion of I/O Completion Ports.
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