spmd_gath_collective.F

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!||====================================================================
!||    spmd_gath_collective   ../engine/source/mpi/generic/spmd_gath_collective.F
!||--- calls      -----------------------------------------------------
!||--- uses       -----------------------------------------------------
!||    spmd_comm_world_mod    ../engine/source/mpi/spmd_comm_world.F90
!||====================================================================
      SUBROUTINE spmd_gath_collective(SRBUF,LEN,LRECV)
C Description: 
C Collective communication version of SPMD_IGATH 
C expected to be less efficient than SPMD_IGATH 
C But useful to debug MPI problems: less pending communication 
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 SRBUF(*), LEN, LRECV
C-----------------------------------------------
C   L o c a l  V a r i a b l e s
C-----------------------------------------------
#ifdef MPI
      INTEGER MSGOFF,MSGOFF2,MSGTYP,INFO,I,K,ATID,ATAG,ALEN,RLEN,S1
      INTEGER STATUS(MPI_STATUS_SIZE),IERROR
      INTEGER SIZES(NSPMD),POINTERS(NSPMD)
      INTEGER,ALLOCATABLE,DIMENSION(:) :: SRBUF2
      DATA msgoff/7013/
      DATA msgoff2/7068/
C-----------------------------------------------
C   S o u r c e  L i n e s
C-----------------------------------------------
 
      s1 = 1
 
      ! Send Local sizes to Zero
      CALL mpi_gather(len,s1,mpi_integer,sizes,s1,mpi_integer,0,spmd_comm_world,ierror)
 
 
      IF(ispmd == 0) THEN
        lrecv = 0 
        DO i=1,nspmd
          lrecv = lrecv + sizes(i)
        ENDDO
        ! Pointers starts at 0
        pointers(1) = 0
        DO i=2,nspmd
          pointers(i) = pointers(i-1)+sizes(i-1)
        ENDDO 
        ALLOCATE(srbuf2(lrecv))
      ELSE
        ALLOCATE(srbuf2(1))
      ENDIF
 
      CALL mpi_gatherv(srbuf,len,mpi_integer,srbuf2,sizes,pointers,mpi_integer,0,spmd_comm_world,ierror)
 
 
      CALL mpi_barrier(spmd_comm_world,ierror)
 
      IF(ispmd == 0) THEN
        DO i=1,lrecv
          srbuf(i) = srbuf2(i)  
        ENDDO 
      ENDIF
      DEALLOCATE(srbuf2)
 
C
#endif
      RETURN
      END