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C $Header: /u/gcmpack/MITgcm/eesupp/src/scatter_2d_rx.template,v 1.6 2009/06/28 01:02:17 jmc Exp $ |
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C $Name: $ |
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|
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#include "PACKAGES_CONFIG.h" |
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#include "CPP_EEOPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: SCATTER_2D_RX |
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C !INTERFACE: |
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SUBROUTINE SCATTER_2D_RX( |
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I gloBuff, |
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O myField, |
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I xSize, ySize, |
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I useExch2GlobLayOut, |
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I zeroBuff, |
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I myThid ) |
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C !DESCRIPTION: |
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C Scatter elements of a global 2-D array from mpi process 0 to all processes. |
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C Note: done by Master-Thread ; might need barrier calls before and after |
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C this S/R call. |
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|
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C !USES: |
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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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#ifdef ALLOW_EXCH2 |
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#include "W2_EXCH2_SIZE.h" |
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#include "W2_EXCH2_TOPOLOGY.h" |
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#endif /* ALLOW_EXCH2 */ |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C gloBuff ( _RX ) :: full-domain 2D IO-buffer array (Input) |
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C myField ( _RX ) :: tiled, local (i.e. my Proc. tiles) 2D array (Output) |
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C xSize (integer):: global buffer 1rst dim (x) |
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C ySize (integer):: global buffer 2nd dim (y) |
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C useExch2GlobLayOut:: =T: Use Exch2 global-map layout (only with EXCH2) |
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C zeroBuff (logical):: =T: reset the buffer to zero after copy |
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C myThid (integer):: my Thread Id number |
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|
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INTEGER xSize, ySize |
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_RX gloBuff(xSize,ySize) |
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_RX myField(1:sNx,1:sNy,nSx,nSy) |
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LOGICAL useExch2GlobLayOut |
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LOGICAL zeroBuff |
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INTEGER myThid |
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CEOP |
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|
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C !LOCAL VARIABLES: |
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INTEGER i,j, bi,bj |
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INTEGER iG, jG |
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INTEGER iBase, jBase |
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#ifdef ALLOW_EXCH2 |
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INTEGER iGjLoc, jGjLoc |
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INTEGER tN |
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#endif /* ALLOW_EXCH2 */ |
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#ifdef ALLOW_USE_MPI |
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INTEGER np, pId |
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_RX temp(1:sNx,1:sNy,nSx,nSy) |
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INTEGER istatus(MPI_STATUS_SIZE), ierr |
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INTEGER lbuff, isource, itag |
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#endif /* ALLOW_USE_MPI */ |
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|
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_BEGIN_MASTER( myThid ) |
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|
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#ifdef ALLOW_USE_MPI |
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IF ( usingMPI ) THEN |
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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 sends local arrays to all other processes |
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DO np = 2, nPx*nPy |
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|
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C-- Process 0 extract the local arrays from the global buffer. |
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|
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#ifdef ALLOW_EXCH2 |
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IF ( useExch2GlobLayOut ) THEN |
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|
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DO bj=1,nSy |
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DO bi=1,nSx |
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tN = W2_procTileList(bi,bj,np) |
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IF ( exch2_mydNx(tN) .GT. xSize ) THEN |
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C- face x-size larger than glob-size : fold it |
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iGjLoc = 0 |
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jGjLoc = exch2_mydNx(tN) / xSize |
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ELSEIF ( exch2_tNy(tN) .GT. ySize ) THEN |
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C- tile y-size larger than glob-size : make a long line |
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iGjLoc = exch2_mydNx(tN) |
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jGjLoc = 0 |
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ELSE |
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C- default (face fit into global-IO-array) |
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iGjLoc = 0 |
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jGjLoc = 1 |
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ENDIF |
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|
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DO j=1,sNy |
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#ifdef TARGET_NEC_SX |
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!cdir novector |
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#endif |
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iG=exch2_txGlobalo(tN)+iGjLoc*(j-1)-1 |
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jG=exch2_tyGlobalo(tN)+jGjLoc*(j-1) |
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DO i=1,sNx |
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temp(i,j,bi,bj) = gloBuff(iG+i,jG) |
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ENDDO |
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ENDDO |
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|
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ENDDO |
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ENDDO |
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|
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ELSE |
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#else /* ALLOW_EXCH2 */ |
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IF (.TRUE.) THEN |
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#endif /* ALLOW_EXCH2 */ |
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|
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iBase = mpi_myXGlobalLo(np)-1 |
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jBase = mpi_myYGlobalLo(np)-1 |
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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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#ifdef TARGET_NEC_SX |
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!cdir novector |
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#endif |
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iG = iBase+(bi-1)*sNx |
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jG = jBase+(bj-1)*sNy+j |
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DO i=1,sNx |
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temp(i,j,bi,bj) = gloBuff(iG+i,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 end if-else useExch2GlobLayOut |
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ENDIF |
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|
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C-- Process 0 sends local arrays to all other processes |
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pId = np - 1 |
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CALL MPI_SEND (temp, lbuff, _MPI_TYPE_RX, |
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& pId, itag, MPI_COMM_MODEL, ierr) |
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|
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C- end loop on np |
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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 (myField, lbuff, _MPI_TYPE_RX, |
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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 |
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#endif /* ALLOW_USE_MPI */ |
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|
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IF( myProcId .EQ. 0 ) THEN |
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C-- Process 0 fills-in its local data |
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|
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#ifdef ALLOW_EXCH2 |
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IF ( useExch2GlobLayOut ) THEN |
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|
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DO bj=1,nSy |
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DO bi=1,nSx |
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tN = W2_myTileList(bi,bj) |
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IF ( exch2_mydNx(tN) .GT. xSize ) THEN |
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C- face x-size larger than glob-size : fold it |
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iGjLoc = 0 |
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jGjLoc = exch2_mydNx(tN) / xSize |
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ELSEIF ( exch2_tNy(tN) .GT. ySize ) THEN |
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C- tile y-size larger than glob-size : make a long line |
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iGjLoc = exch2_mydNx(tN) |
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jGjLoc = 0 |
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ELSE |
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C- default (face fit into global-IO-array) |
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iGjLoc = 0 |
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jGjLoc = 1 |
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ENDIF |
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|
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DO j=1,sNy |
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#ifdef TARGET_NEC_SX |
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!cdir novector |
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#endif |
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iG=exch2_txGlobalo(tN)+iGjLoc*(j-1)-1 |
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jG=exch2_tyGlobalo(tN)+jGjLoc*(j-1) |
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DO i=1,sNx |
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myField(i,j,bi,bj) = gloBuff(iG+i,jG) |
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ENDDO |
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ENDDO |
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|
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ENDDO |
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ENDDO |
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|
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C-- After the copy from the buffer, reset to zero. |
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C An alternative to zeroBuff when writing to file, |
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C which could be faster if we do less read than write. |
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IF ( zeroBuff ) THEN |
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DO j=1,ySize |
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DO i=1,xSize |
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gloBuff(i,j) = 0. |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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ELSE |
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#else /* ALLOW_EXCH2 */ |
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IF (.TRUE.) THEN |
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#endif /* ALLOW_EXCH2 */ |
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|
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iBase = myXGlobalLo-1 |
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jBase = myYGlobalLo-1 |
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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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#ifdef TARGET_NEC_SX |
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!cdir novector |
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#endif |
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iG = iBase+(bi-1)*sNx |
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jG = jBase+(bj-1)*sNy+j |
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DO i=1,sNx |
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myField(i,j,bi,bj) = gloBuff(iG+i,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 end if-else useExch2GlobLayOut |
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ENDIF |
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|
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C- end if myProcId = 0 |
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ENDIF |
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|
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_END_MASTER( myThid ) |
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|
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RETURN |
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END |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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