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We expect 3 threads for outer parallelism and 2 threads for inner
outer ICC / inner GCC
outer_tid
outer_tnum
outer_get_max_threads
inner_tid
inner_tnum
inner_get_num_threads
inner_get_max_threads
[18076]
[0]
[3]
[18076]
[0]
[1]
[3]
[18078]
[1]
[3]
[18078]
[0]
[1]
[3]
[18079]
[2]
[3]
[18079]
[0]
[1]
[3]
3 threads for outer as expected (3 unique values for outer_num)
Only 1 for inner. Seems that gnu openmp is aware it's in nested parallelism which is disable by default.
outer GCC / inner ICC
outer_tid
outer_tnum
outer_get_max_threads
inner_tid
inner_tnum
inner_get_num_threads
inner_get_max_threads
[18158]
[0]
[3]
[18158]
[0]
[2]
[2]
[18158]
[0]
[3]
[18162]
[1]
[2]
[2]
[18160]
[2]
[3]
[18160]
[0]
[4]
[4]
[18160]
[2]
[3]
[18164]
[2]
[4]
[4]
[18160]
[2]
[3]
[18163]
[1]
[4]
[4]
[18160]
[2]
[3]
[18165]
[3]
[4]
[4]
[18159]
[1]
[3]
[18168]
[3]
[4]
[4]
[18159]
[1]
[3]
[18167]
[2]
[4]
[4]
[18159]
[1]
[3]
[18166]
[1]
[4]
[4]
[18159]
[1]
[3]
[18159]
[0]
[4]
[4]
3 threads for outer as expected.
In master thread of outer: 2 inner threads as expected
In other threads: as many as possible (4 is the value returned by omp_get_max_threads before entering the parallel region)
