Gathers a datum from all processes to one
MPI mapping mpi_gather
Type | Intent | Optional | Attributes | Name | ||
---|---|---|---|---|---|---|
integer(kind=int_8), | intent(in) | :: | msg |
Datum to send to root |
||
integer(kind=int_8), | intent(out), | CONTIGUOUS | :: | msg_gather(:) |
Received data (on root) |
|
integer, | intent(in) | :: | root |
Process which gathers the data Message passing environment identifier |
||
integer, | intent(in) | :: | gid |
Process which gathers the data Message passing environment identifier |
SUBROUTINE mp_gather_l (msg, msg_gather, root, gid)
!! Gathers a datum from all processes to one
!!
!! MPI mapping
!! mpi_gather
INTEGER(KIND=int_8), INTENT(IN) :: msg
!! Datum to send to root
INTEGER(KIND=int_8), CONTIGUOUS, INTENT(OUT) :: msg_gather(:)
!! Received data (on root)
INTEGER, INTENT(IN) :: root, gid
!! Process which gathers the data
!! Message passing environment identifier
CHARACTER(LEN=*), PARAMETER :: routineN = 'mp_gather_l'
INTEGER :: handle, ierr, msglen
ierr = 0
CALL timeset(routineN, handle)
msglen = 1
#if defined(__parallel)
CALL mpi_gather(msg, msglen, MPI_INTEGER8, msg_gather, &
msglen, MPI_INTEGER8, root, gid, ierr)
IF (ierr /= 0) CALL mp_stop(ierr, "mpi_gather @ "//routineN)
CALL add_perf(perf_id=4, msg_size=msglen*int_8_size)
#else
MARK_USED(root)
MARK_USED(gid)
msg_gather(1) = msg
#endif
CALL timestop(handle)
END SUBROUTINE mp_gather_l