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How does the OpenMP runtime determine the best number of threads when omp_set_dynamic is used?
e.g. Are some sort of timing mechanisms used or does the compiler give hints to the runtime of how large the task size is?
I don’t think that the OpenMP does determine the ‘best’ number of threads for an application, in any likely sense of the word ‘best’. As @aaa has commented, the runtime’s behaviour when
omp_set_dynamicis true is implementation specific.I don’t think that current Fortran/C/C++ compilers could provide information such as timings or task sizes to the runtime.
I believe that this function is available so that schedulers (and similar) can manage programs on machines, for throughput or similar.