/[MITgcm]/MITgcm/eesupp/src/exch_rx_recv_get_x.template
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revision 1.4 by jmc, Thu Sep 2 14:02:50 2004 UTC revision 1.8 by jmc, Wed Feb 20 20:19:00 2008 UTC
# Line 81  C                                   tile Line 81  C                                   tile
81  #endif  #endif
82  CEOP  CEOP
83    
84           INTEGER myBxLoSave(MAX_NO_THREADS)
85           INTEGER myBxHiSave(MAX_NO_THREADS)
86           INTEGER myByLoSave(MAX_NO_THREADS)
87           INTEGER myByHiSave(MAX_NO_THREADS)
88           LOGICAL doingSingleThreadedComms
89    
90           doingSingleThreadedComms = .FALSE.
91    #ifdef ALLOW_USE_MPI
92    #ifndef ALWAYS_USE_MPI
93          IF ( usingMPI ) THEN
94    #endif
95    C      Set default behavior to have MPI comms done by a single thread.
96    C      Most MPI implementations don't support concurrent comms from
97    C      several threads.
98           IF ( nThreads .GT. 1 ) THEN
99            _BARRIER
100            _BEGIN_MASTER( myThid )
101             DO I=1,nThreads
102              myBxLoSave(I) = myBxLo(I)
103              myBxHiSave(I) = myBxHi(I)
104              myByLoSave(I) = myByLo(I)
105              myByHiSave(I) = myByHi(I)
106             ENDDO
107    C        Comment out loop below and myB[xy][Lo|Hi](1) settings below
108    C        if you want to get multi-threaded MPI comms.
109             DO I=1,nThreads
110              myBxLo(I) = 0
111              myBxHi(I) = -1
112              myByLo(I) = 0
113              myByHi(I) = -1
114             ENDDO
115             myBxLo(1) = 1
116             myBxHi(1) = nSx
117             myByLo(1) = 1
118             myByHi(1) = nSy
119             doingSingleThreadedComms = .TRUE.
120            _END_MASTER( myThid )
121            _BARRIER
122          ENDIF
123    #ifndef ALWAYS_USE_MPI
124          ENDIF
125    #endif
126    #endif
127    
128  C--   Under a "put" scenario we  C--   Under a "put" scenario we
129  C--     i. set completetion signal for buffer we put into.  C--     i. set completetion signal for buffer we put into.
# Line 159  C         IF ( myThid .EQ. 1 .AND. spinC Line 202  C         IF ( myThid .EQ. 1 .AND. spinC
202  C          WRITE(*,*) ' eBl = ', ebl  C          WRITE(*,*) ' eBl = ', ebl
203  C          STOP ' S/R EXCH_RECV_GET_X: spinCount .GT. _EXCH_SPIN_LIMIT'  C          STOP ' S/R EXCH_RECV_GET_X: spinCount .GT. _EXCH_SPIN_LIMIT'
204  C         ENDIF  C         ENDIF
205            IF ( westRecvAck(eBl,bi,bj) .EQ. 0. ) GOTO 10            IF ( westRecvAck(eBl,bi,bj) .EQ. 0 ) GOTO 10
206            IF ( eastRecvAck(eBl,bi,bj) .EQ. 0. ) GOTO 10            IF ( eastRecvAck(eBl,bi,bj) .EQ. 0 ) GOTO 10
207  C        Clear outstanding requests  C        Clear outstanding requests
208           westRecvAck(eBl,bi,bj) = 0.           westRecvAck(eBl,bi,bj) = 0
209           eastRecvAck(eBl,bi,bj) = 0.           eastRecvAck(eBl,bi,bj) = 0
210    
211           IF ( exchNReqsX(1,bi,bj) .GT. 0 ) THEN           IF ( exchNReqsX(1,bi,bj) .GT. 0 ) THEN
212  #ifdef ALLOW_USE_MPI  #ifdef ALLOW_USE_MPI
# Line 318  C--   Read from the buffers Line 361  C--   Read from the buffers
361         ENDDO         ENDDO
362        ENDDO        ENDDO
363    
364          _BARRIER
365          IF ( doingSingleThreadedComms ) THEN
366    C      Restore saved settings that were stored to allow
367    C      single thred comms.
368           _BEGIN_MASTER(myThid)
369            DO I=1,nThreads
370             myBxLo(I) = myBxLoSave(I)
371             myBxHi(I) = myBxHiSave(I)
372             myByLo(I) = myByLoSave(I)
373             myByHi(I) = myByHiSave(I)
374            ENDDO
375           _END_MASTER(myThid)
376          ENDIF                
377          _BARRIER
378    
379        RETURN        RETURN
380        END        END
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