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C $Header: /u/gcmpack/MITgcm/eesupp/src/scatter_2d.F,v 1.6 2005/11/09 19:52:57 jmc Exp $ |
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C $Name: $ |
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|
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#include "CPP_EEOPTIONS.h" |
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|
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SUBROUTINE SCATTER_2D( global, local, myThid ) |
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C Scatter elements of a 2-D array from mpi process 0 to all processes. |
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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:sNx,1:sNy,nSx,nSy) |
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|
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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:sNx,1:sNy,nSx,nSy) |
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INTEGER istatus(MPI_STATUS_SIZE), ierr |
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INTEGER isource, itag, npe |
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INTEGER lbuff |
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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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|
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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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local(i,j,bi,bj) = global(iG,jG) |
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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*nSx*sNy*nSy |
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isource = 0 |
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itag = 0 |
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|
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IF( mpiMyId .EQ. 0 ) THEN |
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|
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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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local(i,j,bi,bj) = global(iG,jG) |
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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 sends local arrays to all other processes |
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DO npe = 1, numberOfProcs-1 |
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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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temp(i,j,bi,bj) = global(iG,jG) |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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CALL MPI_SEND (temp, lbuff, MPI_DOUBLE_PRECISION, |
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& npe, itag, MPI_COMM_MODEL, ierr) |
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ENDDO |
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|
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ELSE |
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|
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C-- All proceses except 0 receive local array from process 0 |
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CALL MPI_RECV (local, lbuff, MPI_DOUBLE_PRECISION, |
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& isource, itag, MPI_COMM_MODEL, istatus, ierr) |
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|
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ENDIF |
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|
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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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