spmd_spamaj.F

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!||====================================================================
!||    spmd_spamaj           ../engine/source/mpi/sph/spmd_spamaj.F
!||--- called by ------------------------------------------------------
!||    sphprep               ../engine/source/elements/sph/sphprep.F
!||--- calls      -----------------------------------------------------
!||--- uses       -----------------------------------------------------
!||    sphbox                ../engine/share/modules/sphbox.F
!||    spmd_comm_world_mod   ../engine/source/mpi/spmd_comm_world.F90
!||====================================================================
      SUBROUTINE spmd_spamaj(IREDUCE, SPAGLOB)
C-----------------------------------------------
C   M o d u l e s
C-----------------------------------------------
      USE sphbox
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      "task_c.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER IREDUCE
       my_real
     .        spaglob
C-----------------------------------------------
C   L o c a l  V a r i a b l e s
C-----------------------------------------------
#ifdef MPI
      INTEGER  LOC_PROC, IERROR,
     .        MSGOFF
      INTEGER :: I_LEN
 
       my_real, DIMENSION(2) :: sbuf,rbuf
       DATA msgoff/2007/
C-----------------------------------------------
C   S o u r c e  L i n e s
C-----------------------------------------------
       loc_proc = ispmd+1
 
       i_len = 2
!      -----------------------
       sbuf(1) = ireduce
       sbuf(2) = -spaglob
 
!      -----------------------
!      allreduce with MIN and MAX operation
       call mpi_allreduce(sbuf, rbuf, 2, real , mpi_max,
     &                    spmd_comm_world, ierror)
!      -----------------------
 
       ireduce = nint(rbuf(1))
       spaglob = -rbuf(2)
 
#endif
      RETURN
      END