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C $Header: /u/gcmpack/MITgcm/eesupp/src/gather_2d.F,v 1.5 2005/11/05 00:51:06 jmc Exp $ |
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C $Name: $ |
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#include "CPP_EEOPTIONS.h" |
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SUBROUTINE GATHER_2D( global, local, myThid ) |
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C Gather elements of a 2-D array from all mpi processes to process 0. |
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IMPLICIT NONE |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "EESUPPORT.h" |
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C mythid - thread number for this instance of the routine. |
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C global,local - working arrays used to transfer 2-D fields |
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INTEGER mythid |
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Real*8 global(Nx,Ny) |
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_RL local(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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INTEGER iG,jG, i, j, bi, bj |
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#ifdef ALLOW_USE_MPI |
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_RL temp(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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INTEGER istatus(MPI_STATUS_SIZE), ierr |
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INTEGER lbuff, idest, itag, npe, ready_to_receive |
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#endif /* ALLOW_USE_MPI */ |
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|
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C-- Make everyone wait except for master thread. |
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_BARRIER |
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_BEGIN_MASTER( myThid ) |
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|
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#ifndef ALLOW_USE_MPI |
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DO bj=1,nSy |
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DO bi=1,nSx |
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DO j=1,sNy |
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DO i=1,sNx |
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iG = myXGlobalLo-1+(bi-1)*sNx+i |
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jG = myYGlobalLo-1+(bj-1)*sNy+j |
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global(iG,jG) = local(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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#else /* ALLOW_USE_MPI */ |
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|
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lbuff = (sNx+2*OLx)*nSx*(sNy+2*OLy)*nSy |
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idest = 0 |
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itag = 0 |
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ready_to_receive = 0 |
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|
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IF( mpiMyId .EQ. 0 ) THEN |
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C-- Process 0 fills-in its local data |
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npe = 0 |
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DO bj=1,nSy |
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DO bi=1,nSx |
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DO j=1,sNy |
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DO i=1,sNx |
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iG = mpi_myXGlobalLo(npe+1)-1+(bi-1)*sNx+i |
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jG = mpi_myYGlobalLo(npe+1)-1+(bj-1)*sNy+j |
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global(iG,jG) = local(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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C-- Process 0 polls and receives data from each process in turn |
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DO npe = 1, numberOfProcs-1 |
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CALL MPI_SEND (ready_to_receive, 1, MPI_INTEGER, |
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& npe, itag, MPI_COMM_MODEL, ierr) |
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CALL MPI_RECV (temp, lbuff, MPI_DOUBLE_PRECISION, |
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& npe, itag, MPI_COMM_MODEL, istatus, ierr) |
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|
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C-- Process 0 gathers the local arrays into a global array. |
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DO bj=1,nSy |
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DO bi=1,nSx |
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DO j=1,sNy |
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DO i=1,sNx |
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iG = mpi_myXGlobalLo(npe+1)-1+(bi-1)*sNx+i |
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jG = mpi_myYGlobalLo(npe+1)-1+(bj-1)*sNy+j |
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global(iG,jG) = temp(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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ELSE |
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C-- All proceses except 0 wait to be polled then send local array |
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CALL MPI_RECV (ready_to_receive, 1, MPI_INTEGER, |
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& idest, itag, MPI_COMM_MODEL, istatus, ierr) |
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CALL MPI_SEND (local, lbuff, MPI_DOUBLE_PRECISION, |
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& idest, itag, MPI_COMM_MODEL, ierr) |
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|
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ENDIF |
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#endif /* ALLOW_USE_MPI */ |
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|
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_END_MASTER( myThid ) |
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_BARRIER |
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|
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RETURN |
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END |
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