Element-wise sum of a rank-1 array on all processes.
see mp_sum_i
Type | Intent | Optional | Attributes | Name | ||
---|---|---|---|---|---|---|
integer(kind=int_4), | intent(inout), | CONTIGUOUS | :: | msg(:) |
Vector to sum and result |
|
integer, | intent(in) | :: | gid | |||
integer, | intent(inout) | :: | request |
SUBROUTINE mp_isum_iv(msg, gid, request)
!! Element-wise sum of a rank-1 array on all processes.
!! @note see mp_sum_i
INTEGER(KIND=int_4), CONTIGUOUS, INTENT(INOUT) :: msg(:)
!! Vector to sum and result
INTEGER, INTENT(IN) :: gid
INTEGER, INTENT(INOUT) :: request
CHARACTER(LEN=*), PARAMETER :: routineN = 'mp_isum_iv'
INTEGER :: handle, ierr
#if defined(__parallel)
INTEGER :: msglen
#endif
ierr = 0
CALL timeset(routineN, handle)
#if defined(__parallel)
msglen = SIZE(msg)
IF (msglen > 0) THEN
CALL mpi_iallreduce(MPI_IN_PLACE, msg, msglen, MPI_INTEGER, MPI_SUM, gid, request, ierr)
IF (ierr /= 0) CALL mp_stop(ierr, "mpi_iallreduce @ "//routineN)
ELSE
request = mp_request_null
END IF
CALL add_perf(perf_id=23, msg_size=msglen*int_4_size)
#else
MARK_USED(msg)
MARK_USED(gid)
request = mp_request_null
#endif
CALL timestop(handle)
END SUBROUTINE mp_isum_iv