spmd_fvb_amax.F

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!||====================================================================
!||    spmd_fvb_amax         ../engine/source/mpi/anim/spmd_fvb_amax.F
!||--- called by ------------------------------------------------------
!||    delnumbc              ../engine/source/output/anim/generate/delnumbc.f
!||--- calls      -----------------------------------------------------
!||--- uses       -----------------------------------------------------
!||    spmd_comm_world_mod   ../engine/source/mpi/spmd_comm_world.F90
!||====================================================================
      SUBROUTINE spmd_fvb_amax(IDCMAX, IDCMAXL)
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      "task_c.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER IDCMAX, IDCMAXL
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
#ifdef MPI
      INTEGER I, ITAG, MSGOFF, IDCMAXP(NSPMD-1), REQ(NSPMD-1),
     .        STAT(MPI_STATUS_SIZE,NSPMD-1), IERR
C-----------------------------------------------
      DATA msgoff/7053/
C-----------------------------------------------
C
      IF (ispmd==0) THEN
         DO i=1,nspmd-1
            itag=msgoff
            CALL mpi_irecv(idcmaxp(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         
         idcmax=idcmaxl
         DO i=1,nspmd-1
            idcmax=max(idcmax,idcmaxp(i))
         ENDDO
      ELSE
         itag=msgoff
         CALL mpi_isend(idcmaxl, 1, mpi_integer, it_spmd(1),
     .                  itag, spmd_comm_world, req, ierr)
         CALL mpi_wait(req, stat, ierr)
      ENDIF
C
#endif
      RETURN
      END