Thread affinity with Windows, MSVC, and OpenMP

Question

I want to bind the threads in my code to each physical core. With GCC I have successfully done this using sched_setaffinity so I no longer have to set exp

Answer 1

You should use the SetThreadAffinityMask function (see MSDN reference). You are setting the process's mask.

You can obtain a thread ID in OpenMP with this code:

int tid = omp_get_thread_num();

However the code above provides OpenMP's internal thread ID, and not the system thread ID. This article explains more on the subject:

http://msdn.microsoft.com/en-us/magazine/cc163717.aspx

if you need to explicitly work with those trheads - use the explicit affinity type as explained in this Intel documentation:

https://software.intel.com/sites/products/documentation/studio/composer/en-us/2011Update/compiler_c/optaps/common/optaps_openmp_thread_affinity.htm