spmd_allreduce_db_comm.F

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!||====================================================================
!||    spmd_allreduce_db_comm   ../engine/source/mpi/generic/spmd_allreduce_db_comm.F
!||--- calls      -----------------------------------------------------
!||====================================================================
        SUBROUTINE spmd_allreduce_db_comm(VALUE,RES,MY_SIZE,MY_OPERATION,MY_COMM)
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#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   D u m m y   A r g u m e n t s
C-----------------------------------------------
        CHARACTER(len=*), INTENT(in) :: MY_OPERATION
        INTEGER, INTENT(in) :: MY_SIZE,MY_COMM
        REAL(kind=8), dimension(my_size), INTENT(in) :: VALUE
        REAL(kind=8), dimension(my_size), INTENT(out) :: res
 
#ifdef MPI
C-----------------------------------------------
C   L o c a l  V a r i a b l e s
C-----------------------------------------------
        INTEGER :: error
        INTEGER :: MPI_OPERATION
!       ----------------------------------------
        
        IF(my_operation(1:3)=="SUM") THEN
                mpi_operation=mpi_sum
        ELSEIF(my_operation(1:4)=="PROD") THEN
                mpi_operation=mpi_prod
        ELSEIF(my_operation(1:3)=="MAX") THEN
                mpi_operation=mpi_max
        ELSEIF(my_operation(1:3)=="MIN") THEN
                mpi_operation=mpi_min               
        ENDIF
 
!       ------------------
!       mpi comm allreduce
        CALL mpi_allreduce(VALUE,res,my_size,mpi_double_precision,mpi_operation,my_comm,error)
!       ------------------
#else
        res = 0
#endif
        RETURN
        END SUBROUTINE spmd_allreduce_db_comm
!       ----------------------------------------