spmd_exch_icodt.F

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C
!||====================================================================
!||    spmd_exch_icodt       ../engine/source/mpi/nodes/spmd_exch_icodt.F
!||--- called by ------------------------------------------------------
!||    resol                 ../engine/source/engine/resol.F
!||--- calls      -----------------------------------------------------
!||--- uses       -----------------------------------------------------
!||    spmd_comm_world_mod   ../engine/source/mpi/spmd_comm_world.F90
!||====================================================================
      SUBROUTINE spmd_exch_icodt(ICODT,IAD_ELEM,FR_ELEM,SIZE,LENR)
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 ICODT(*), IAD_ELEM(2,*), FR_ELEM(*), SIZE, LENR
C-----------------------------------------------
C   L o c a l  V a r i a b l e s
C-----------------------------------------------
#ifdef MPI
      INTEGER MSGTYP,I,NOD,LOC_PROC,IERROR, MSGOFF,
     .        SIZ,J,L,NB_NOD,
     .        STATUS(MPI_STATUS_SIZE),
     .        IAD_SEND(NSPMD+1),IAD_RECV(NSPMD+1),
     .        REQ_R(NSPMD),REQ_S(NSPMD),
     .        RBUF(SIZE*LENR), SBUF(SIZE*LENR)
      DATA msgoff/127/
 
C-----------------------------------------------
C   S o u r c e  L i n e s
C-----------------------------------------------
      loc_proc = ispmd + 1
      l = 1
      iad_recv(1) = 1
      DO i=1,nspmd
        siz = size*(iad_elem(1,i+1)-iad_elem(1,i))
        IF(siz/=0)THEN
          msgtyp = msgoff
          CALL mpi_irecv(
     s      rbuf(l),siz,mpi_integer,it_spmd(i),msgtyp,
     g      spmd_comm_world,req_r(i),ierror)
          l = l + siz
        ENDIF
        iad_recv(i+1) = l
      END DO
      l = 1
      iad_send(1) = 1
      DO i=1,nspmd
#include      "vectorize.inc"
        DO j=iad_elem(1,i),iad_elem(1,i+1)-1
          nod = fr_elem(j)
          sbuf(l  ) =  icodt(nod)
          l = l + SIZE
        END DO
        iad_send(i+1) = l
      ENDDO
C
C   echange messages
C
      DO i=1,nspmd
C--------------------------------------------------------------------
       IF(iad_elem(1,i+1)-iad_elem(1,i)>0)THEN
          msgtyp = msgoff
          siz = iad_send(i+1)-iad_send(i)
          l = iad_send(i)
          CALL mpi_isend(
     s      sbuf(l),siz,mpi_integer,it_spmd(i),msgtyp,
     g      spmd_comm_world,req_s(i),ierror)
       ENDIF
C--------------------------------------------------------------------
      ENDDO
C
      DO i = 1, nspmd
        nb_nod = iad_elem(1,i+1)-iad_elem(1,i)
        IF(nb_nod>0)THEN
          CALL mpi_wait(req_r(i),status,ierror)
          l = iad_recv(i)
#include      "vectorize.inc"
          DO j=iad_elem(1,i),iad_elem(1,i+1)-1
            nod = fr_elem(j)
            icodt(nod) = min(icodt(nod),rbuf(l))
            l = l + SIZE
          END DO
       ENDIF
      END DO
C
      DO i = 1, nspmd
        IF(iad_elem(1,i+1)-iad_elem(1,i)>0)THEN
          CALL mpi_wait(req_s(i),status,ierror)
        ENDIF
      ENDDO
C
#endif
      RETURN
      END