omp_set_num_threads (3f)

sets the number of threads to use for the next parallel region

Syntax

  interface
     subroutine omp_set_num_threads ( number_of_threads )
     integer number_of_threads
     end subroutine omp_set_num_threads
  end interface
  integer scalar_integer_expression
  call omp_set_num_threads ( scalar_integer_expression )

Description

  The compiler evaluates the scalar integer expression and interprets its
  value as the number of threads to use.  This routine takes effect only when
  called from serial portions of the program.  The behavior of the routine is
  undefined if the routine is called from a portion of the program where
  omp_in_parallel returns TRUE.

  A call to omp_set_num_threads sets the maximum number of threads to use for
  the next parallel region when dynamic adjustment of the number of threads
  is enabled.  A call to the omp_set_num_threads routine has precedence over
  the OMP_NUM_THREADS environment variable.

See Also

  omp_get_dynamic(3f), omp_get_num_threads(3f) omp_in_parallel(3f),
  omp_set_dynamic(3f)