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#include "CPP_OPTIONS.h" |
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|
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SUBROUTINE SCATTER_VECTOR( length, 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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INTEGER length |
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Real*8 global(length*nPx*nPy) |
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_RL local(length) |
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|
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INTEGER iG,jG,lG, l |
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#ifdef ALLOW_USE_MPI |
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_RL temp(length) |
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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 l=1,length |
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iG=1+(myXGlobalLo-1)/sNx ! Kludge until unstructered tiles |
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jG=1+(myYGlobalLo-1)/sNy ! Kludge until unstructered tiles |
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lG= (jG-1)*nPx*length + (iG-1)*length + l |
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local(l) = global(lG) |
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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 = length |
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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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iG=mpi_myXGlobalLo(npe+1)/sNx+1 |
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jG=mpi_myYGlobalLo(npe+1)/sNy+1 |
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DO l=1,length |
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lG= (jG-1)*nPx*length + (iG-1)*length + l |
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local(l) = global(lG) |
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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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iG = mpi_myXGlobalLo(npe+1)/sNx+1 |
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jG = mpi_myYGlobalLo(npe+1)/sNy+1 |
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DO l=1,length |
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lG= (jG-1)*nPx*length + (iG-1)*length + l |
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temp(l) = global(lG) |
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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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C-- Fill in edges. |
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cph _EXCH_XY_R8( local, myThid ) |
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|
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RETURN |
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END |
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