OMP_SET_NUM_THREADS

Purpose:

Sets the number of threads that will be used in the next parallel region. Must be a postive integer.

Format:

Fortran

SUBROUTINE OMP_SET_NUM_THREADS(scalar_integer_expression)

C/C++

#include <omp.h>
void omp_set_num_threads(int num_threads)

Notes & Restrictions:

• The dynamic threads mechanism modifies the effect of this routine.
  • Enabled: specifies the maximum number of threads that can be used for any parallel region by the dynamic threads mechanism.
  • Disabled: specifies exact number of threads to use until next call to this routine.
• This routine can only be called from the serial portions of the code
• This call has precedence over the OMP_NUM_THREADS environment variable