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OpenMP on a a Intel Core 2 Quad (processor X5355)

verdolaga
Beginner
131 Views
I have a problem when i try parallelization with OpenMP on a a Intel Core 2 Quad (processor X5355)

when i'm using a single proccessor the running time is : 48 minutes, but if i use four proccessors the running time is 23 minutes, but if use 5, 6,7,8 the running time is the same 21 MIN !!!... when i'm using 5 to 8 processors the paralelizacion time does not decreases ...

what is the problem..??
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1 Reply
TimP
Black Belt
131 Views
We can't guess accurately what is in your application. For example, you may be using all the memory bandwidth at 2 threads.
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