spmd_crk_idmax.F

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C
!||====================================================================
!||    spmd_crk_idmax        ../engine/source/mpi/anim/spmd_crk_idmax.F
!||--- called by ------------------------------------------------------
!||    genani                ../engine/source/output/anim/generate/genani.F
!||--- calls      -----------------------------------------------------
!||--- uses       -----------------------------------------------------
!||    spmd_comm_world_mod   ../engine/source/mpi/spmd_comm_world.F90
!||====================================================================
      SUBROUTINE spmd_crk_idmax(IDMAX,ITAB)
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   C o m m o n   B l o c k s
C-----------------------------------------------
#include      "com01_c.inc"
#include      "com04_c.inc"
#include      "task_c.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER IDMAX,ITAB(*)
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
#ifdef MPI
      INTEGER IDMAXL, I, ITAG, MSGOFF, IDMAXP(NSPMD-1), 
     .        REQ(NSPMD-1), IERR, STAT(MPI_STATUS_SIZE,NSPMD-1)
C-----------------------------------------------
      DATA msgoff/7063/
C-----------------------------------------------
      idmaxl=0
      DO i=1,numnod
         idmaxl=max(idmaxl,itab(i))
      ENDDO
      IF (ispmd==0) THEN
         DO i=1,nspmd-1
            itag=msgoff
            CALL mpi_irecv(idmaxp(i), 1, mpi_integer, it_spmd(i+1),
     .                     itag, spmd_comm_world, req(i), ierr)
         ENDDO
         CALL mpi_waitall(nspmd-1, req, stat, ierr)
C
         idmax=idmaxl
         DO i=1,nspmd-1
            idmax=max(idmax,idmaxp(i))
         ENDDO
      ELSE
         itag=msgoff
         CALL mpi_isend(idmaxl, 1, mpi_integer, it_spmd(1),
     .                  itag, spmd_comm_world, req, ierr)
         CALL mpi_wait(req, stat, ierr)
      ENDIF
C
#endif
      RETURN
      END