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My MacBookPro, running BootCamp, has an Intel i7-640M processor, which has 2 cores. Like all the other i7 chips, each core is hyperthreaded, so you can have up to 4 threads. Using Visual Studio 2010 c/c++ to determine these:
coresAvailable = omp_get_num_procs ( );
threadsAvailable = omp_get_max_threads ( ) ;
The “threadsAvailable” comes back with a value of 4, as expected. But “coresAvailable” also is reported as 4.
What am I missing?
omp_get_num_procsreturns the number of CPUs the OS reports, and since a hyperthreaded core reports itself as 2 CPUs, a dual-core hyperthreaded chip will report itself as 4 processors.omp_get_max_threadsreturns the most threads that will be used in a parallel region of code, so it makes sense that the most threads it will use will be the number of CPUs available.