topic about OMP_set_num_threads() in Intel® Moderncode for Parallel Architectures

about OMP_set_num_threads()

stydofe1 — Mon, 08 Aug 2011 22:13:31 GMT

I am using Intel composer XE 2011.I have some simple codes as below to test the function OMP_set_num_threads, the program freezes once entering the parallel region.

call OMP_set_num_threads(4)

!$omp parallel

print *, 'hello parallel'

!$omp end parallel

It works fine if I use clause instead.

!$omp parallel num_threads(4)

print *, 'hello parallel'

!$omp end parallel

What am I missing in using the routine OMP_set_num_threads?

about OMP_set_num_threads()

Steven_L_Intel1 — Thu, 11 Aug 2011 13:51:00 GMT

See my reply in your other thread on this topic.

about OMP_set_num_threads()

jimdempseyatthecove — Thu, 11 Aug 2011 15:57:13 GMT

Did you include

USE OMP_LIB

Are you using IMPLICIT NONE?

If you are not using IMPLICIT NONE the compiler will not report that you may have forgotten to have USE OMP_LIB to declare the proper interface for OMP_set_num_threads (which are not necessarily what the default calling sequence is).

Jim Dempsey