spmd_box_limit_reduction.F

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!||====================================================================
!||    spmd_box_limit_reduction   ../engine/source/mpi/interfaces/spmd_box_limit_reduction.F
!||--- called by ------------------------------------------------------
!||    inter_init_component       ../engine/source/interfaces/generic/inter_init_component.F90
!||    inter_prepare_sort         ../engine/source/interfaces/generic/inter_prepare_sort.F
!||--- calls      -----------------------------------------------------
!||--- uses       -----------------------------------------------------
!||    inter_struct_mod           ../engine/share/modules/inter_struct_mod.F
!||    spmd_mod                   ../engine/source/mpi/spmd_mod.F90
!||====================================================================
        SUBROUTINE spmd_box_limit_reduction(NB_INTER_SORTED,box_limit)
!$COMMENT
!       SPMD_GRID_LIMIT_REDUCTION description :
!       compute the minimal & maximal positions      
!
!       SPMD_GRID_LIMIT_REDUCTION organization :
!       loop over the nodes & min+max computation
!$ENDCOMMENT
C-----------------------------------------------
C   M o d u l e s
C-----------------------------------------------
        USE inter_struct_mod
        USE spmd_mod
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-----------------------------------------------
        INTEGER, INTENT(in) :: NB_INTER_SORTED        !< number of interfaces that need to be sorted
        my_real, dimension(6), intent(inout) :: box_limit !< upper & lower bound of the box
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
        INTEGER :: I
        REAL(kind=8), dimension(6) :: buffer_s,buffer_r
#ifdef MPI        
        CHARACTER(len=4) :: MY_OPERATION
C-----------------------------------------------
        !   ------------------  
        !   globalization of min/max position      
        DO i=1,3
            buffer_s(i) = box_limit(i)  ! max values
            buffer_s(3+i) = -one * box_limit(3+i)   ! min values
        ENDDO
        !   ------------------
        my_operation(1:4) = ''
        my_operation(1:3) = "MAX"
        
        CALL spmd_allreduce(buffer_s,buffer_r,6,spmd_max)
        !   ------------------
        IF(nb_inter_sorted>0) THEN
            DO i=1,3
                box_limit(i) = buffer_r(i)
                box_limit(3+i) = -one * buffer_r(3+i)
            ENDDO 
        ENDIF
        !   ------------------
#endif
        RETURN
        END SUBROUTINE spmd_box_limit_reduction