Having more than one CPU core on a single chip makes a system with a processor with two cores operate just like a dual-processor computer, and a system with a processor with four cores operate like a quad-processor computer, so you get much better performance. But if your application does not take advantage of these multiple cores, you may not reap the benefits. OpenMP helps you create multithreaded C++ applications more quickly so the benefits of multithreading can be realized.
Kang Su Gatlin and Pete Isensee
MSDN Magazine October 2005
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