spmd_sumax.F

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C
!||====================================================================
!||    spmd_sumax            ../engine/source/mpi/generic/spmd_sumax.F
!||--- calls      -----------------------------------------------------
!||--- uses       -----------------------------------------------------
!||    spmd_comm_world_mod   ../engine/source/mpi/spmd_comm_world.F90
!||====================================================================
      SUBROUTINE spmd_sumax(V,LEN1,LEN)
C gather tableau V de taille LEN de type my_real
C max des valeurs absolues sur LEN1
C somme des valeurs sur LEN2 = LEN - LEN1
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 LEN,LEN1
      my_real
     .        v(len)
C-----------------------------------------------
C   L o c a l  V a r i a b l e s
C-----------------------------------------------
#ifdef MPI
      INTEGER MSGOFF,MSGTYP,I,K
      DATA msgoff/107/
      INTEGER STATUS(MPI_STATUS_SIZE),IERROR
      my_real
     .        vtmp(len)
C-----------------------------------------------
C   S o u r c e  L i n e s
C-----------------------------------------------
      IF (ispmd/=0) THEN
        msgtyp=msgoff
        CALL mpi_send(v,len,real,it_spmd(1),msgtyp,
     .                spmd_comm_world,ierror)
      ELSE
        DO k=2,nspmd
          msgtyp=msgoff
          CALL mpi_recv(vtmp,len,real,it_spmd(k),msgtyp,
     .                  spmd_comm_world,status,ierror)
          DO i=1,len1
            IF(abs(v(i))<abs(vtmp(i))) THEN
              v(i) = vtmp(i)
            ENDIF
          ENDDO
C
          DO i=len1+1,len
            v(i) = v(i)+vtmp(i)
          ENDDO
        ENDDO
      ENDIF
C
#endif
      RETURN
      END