sum_allreduce_sub_real Subroutine

private subroutine sum_allreduce_sub_real(a, sub_comm)

FIXME : Add documentation

Arguments

Type IntentOptional Attributes Name
real, intent(inout) :: a
integer, intent(in) :: sub_comm

Contents


Source Code

  subroutine sum_allreduce_sub_real (a,sub_comm)
    implicit none
    real, intent (in out) :: a
    integer, intent(in) :: sub_comm
# ifdef MPI
    integer :: ierror
!$OMP MASTER
    call time_message(.false., time_mp_collectives, ' MPI Collectives')
!$OMP END MASTER
    call mpi_allreduce &
         (MPI_IN_PLACE, a, 1, mpireal, MPI_SUM, sub_comm, ierror)
!$OMP MASTER
    call time_message(.false., time_mp_collectives, ' MPI Collectives')
!$OMP END MASTER
# endif
  end subroutine sum_allreduce_sub_real