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SUBROUTINE EXCH_XY_R8( arr ) |
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|
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C == Global variables == |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "EXCH.h" |
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|
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#ifdef ALLOW_MPI |
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#include "mpif.h" |
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#endif |
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|
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#include "MPI_INFO.h" |
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#include "JAM_INFO.h" |
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|
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C == Routine arguments == |
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Real*8 arr(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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|
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C == Local variables == |
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INTEGER I, J |
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INTEGER northProc, southProc |
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INTEGER farProc1, farProc2 |
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INTEGER toPid, fromPid |
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INTEGER rc |
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|
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INTEGER myFourWayRank, exchangePhase |
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|
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#ifdef ALLOW_MPI |
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INTEGER mpiStatus(MPI_STATUS_SIZE) |
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#endif |
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|
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C East-west halo update (without corners) |
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DO J=1,sNy |
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DO I=1,OLx |
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arr(1-I ,J) = arr(sNx-I+1,J) |
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arr(sNx+I,J) = arr(1+I-1 ,J) |
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ENDDO |
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ENDDO |
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|
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C Phase 1 pairing |
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C | 0 | ---> | 1 | |
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C | 0 | <--- | 1 | |
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|
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C | 2 | ---> | 3 | |
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C | 2 | <--- | 3 | |
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|
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C | 4 | ---> | 5 | |
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C | 4 | <--- | 5 | |
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|
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C etc ... |
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C |
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|
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#ifdef USE_MPI_EXCH |
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C North-south halo update (without corners) |
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C Put my edges into a buffers |
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IF ( MOD(myProcId,2) .EQ. 0 ) THEN |
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DO I=1,sNx |
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exchBuf1(I) = arr(I,sNy) |
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exchBuf2(I) = arr(I,1 ) |
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ENDDO |
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ELSE |
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DO I=1,sNx |
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exchBuf1(I) = arr(I,1 ) |
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exchBuf2(I) = arr(I,sNy) |
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ENDDO |
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ENDIF |
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|
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C Exchange the buffers |
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northProc = mpi_northId |
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southProc = mpi_southId |
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IF ( MOD(myProcId,2) .EQ. 0 ) THEN |
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farProc1 = northProc |
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farProc2 = southProc |
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ELSE |
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farProc1 = southProc |
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farProc2 = northProc |
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ENDIF |
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C Even-odd pairs |
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IF ( farProc1 .NE. myProcId ) THEN |
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CALL MPI_Sendrecv_replace(exchBuf1,sNx,MPI_DOUBLE_PRECISION, |
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& farProc1,0, |
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& farProc1,MPI_ANY_TAG, |
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& MPI_COMM_WORLD,mpiStatus, |
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& rc) |
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ENDIF |
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C Odd-even pairs |
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IF ( farProc2 .NE. myProcId ) THEN |
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CALL MPI_Sendrecv_replace(exchBuf2,sNx,MPI_DOUBLE_PRECISION, |
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& farProc2,0, |
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& farProc2,MPI_ANY_TAG, |
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& MPI_COMM_WORLD,mpiStatus, |
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& rc) |
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ENDIF |
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#endif |
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|
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#ifdef USE_JAM_EXCH |
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|
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myFourWayRank = MOD(myProcId,4) |
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|
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northProc = jam_northId |
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southProc = jam_southId |
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IF ( MOD(myProcId,2) .EQ. 0 ) THEN |
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C sendBuf1 = &arr(I,sNy ) |
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C recvBuf1 = &arr(I,sNy+1) |
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C sendBuf2 = &arr(I,1 ) |
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C recvBuf2 = &arr(I,0 ) |
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farProc1 = northProc |
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farProc2 = southProc |
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IF ( farProc1 .NE. myProcId ) THEN |
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CALL JAM_EXCHANGE(farProc1,arr(I,sNy),arr(I,sNy+1),sNx*8,jam_exchKey) |
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jam_exchKey = jam_exchKey+1 |
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ENDIF |
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|
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10 CONTINUE |
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CALL JAM_EXCHANGE_TEST( exchangePhase ) |
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IF ( myFourWayRank .EQ. 0 ) THEN |
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IF ( exchangePhase .EQ. 0 ) GOTO 11 |
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ELSE |
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IF ( exchangePhase .EQ. 1 ) GOTO 11 |
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ENDIF |
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GOTO 10 |
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11 CONTINUE |
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|
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IF ( farProc2 .NE. myProcId ) THEN |
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CALL JAM_EXCHANGE(farProc2,arr(I,1),arr(I,0),sNx*8,jam_exchKey) |
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jam_exchKey = jam_exchKey+1 |
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ENDIF |
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|
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CALL JAM_EXCHANGE_MARK |
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|
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ELSE |
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C sendBuf1 = &arr(I,1 ) |
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C recvBuf1 = &arr(I,0 ) |
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C sendBuf2 = &arr(I,sNy ) |
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C recvBuf2 = &arr(I,sNy+1) |
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farProc1 = southProc |
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farProc2 = northProc |
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IF ( farProc1 .NE. myProcId ) THEN |
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CALL JAM_EXCHANGE(farProc1,arr(I,1),arr(I,0),sNx*8,jam_exchKey) |
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jam_exchKey = jam_exchKey+1 |
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ENDIF |
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|
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20 CONTINUE |
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CALL JAM_EXCHANGE_TEST( exchangePhase ) |
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IF ( myFourWayRank .EQ. 3 ) THEN |
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IF ( exchangePhase .EQ. 0 ) GOTO 21 |
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ELSE |
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IF ( exchangePhase .EQ. 1 ) GOTO 21 |
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ENDIF |
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GOTO 20 |
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21 CONTINUE |
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|
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IF ( farProc2 .NE. myProcId ) THEN |
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CALL JAM_EXCHANGE(farProc2,arr(I,sNy),arr(I,sNy+1),sNx*8,jam_exchKey) |
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jam_exchKey = jam_exchKey+1 |
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ENDIF |
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|
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CALL JAM_EXCHANGE_MARK |
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|
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ENDIF |
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#endif |
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|
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#ifdef USE_MPI_EXCH |
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C Fill overlap regions from the buffers |
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IF ( MOD(myProcId,2) .EQ. 0 ) THEN |
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DO I=1,sNx |
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arr(I,sNy+1) = exchBuf1(I) |
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arr(I,0 ) = exchBuf2(I) |
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ENDDO |
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ELSE |
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DO I=1,sNx |
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arr(I,sNy+1) = exchBuf2(I) |
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arr(I,0 ) = exchBuf1(I) |
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ENDDO |
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ENDIF |
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#endif |
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|
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IF ( numberOfProcs .EQ. 1 ) THEN |
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DO I=1,sNx |
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arr(I,sNy+1) = arr(I,1 ) |
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arr(I,0 ) = arr(I,sNy) |
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ENDDO |
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ENDIF |
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|
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RETURN |
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END |
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