spmd_comm_split.F File Reference

#include "implicit_f.inc"
#include "spmd.inc"

Go to the source code of this file.

Functions/Subroutines
subroutine	spmd_comm_split (color, key, subcomm, rank, size_l)

Function/Subroutine Documentation

spmd_comm_split()

subroutine spmd_comm_split	(	integer	color,
		integer	key,
		integer	subcomm,
		integer	rank,
		integer	size_l )

Definition at line 32 of file spmd_comm_split.F.

C Wrapper to MPI_COMM_SPLIT: returns RANK = -1 and
C  SUBCOMM = MPI_COMM_NULL if the processor does not belong the the
C  subcommunicator 
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
        USE spmd_comm_world_mod, ONLY : spmd_comm_world
#include      "implicit_f.inc"
C-----------------------------------------------------------------
C   M e s s a g e   P a s s i n g
C-----------------------------------------------
#include "spmd.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER COMM        ! communicator IN
      INTEGER SUBCOMM     ! communicator OUT
      INTEGER RANK        ! rank in the new comm.
      INTEGER SIZE_L      ! size of the new comm.
      INTEGER COLOR,KEY   ! color
C-----------------------------------------------
C   L o c a l  V a r i a b l e s
C-----------------------------------------------
#ifdef MPI
      INTEGER STATUS(MPI_STATUS_SIZE),IERROR
C-----------------------------------------------
C   S o u r c e  L i n e s
C-----------------------------------------------
      CALL mpi_barrier(spmd_comm_world,ierror)
      CALL mpi_comm_split(spmd_comm_world,color,key,subcomm,ierror)
      IF(color > 0) THEN
        CALL mpi_comm_rank(subcomm, rank, ierror)
        CALL mpi_comm_size(subcomm, size_l, ierror)
      ELSE
        rank = -1 
        subcomm = mpi_comm_null
      ENDIF
      CALL mpi_barrier(spmd_comm_world,ierror)
 
 
#endif
      RETURN