/[MITgcm]/MITgcm/eesupp/src/exch_rx_recv_get_x.template
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revision 1.5 by cnh, Mon Nov 7 19:03:36 2005 UTC revision 1.6 by cnh, Wed Nov 9 17:22:08 2005 UTC
# Line 81  C                                   tile Line 81  C                                   tile
81  #endif  #endif
82  CEOP  CEOP
83    
 #ifdef USE_SINGLE_THREADED_EXCH_COMMS  
84         INTEGER myBxLoSave(MAX_NO_THREADS)         INTEGER myBxLoSave(MAX_NO_THREADS)
85         INTEGER myBxHiSave(MAX_NO_THREADS)         INTEGER myBxHiSave(MAX_NO_THREADS)
86         INTEGER myByLoSave(MAX_NO_THREADS)         INTEGER myByLoSave(MAX_NO_THREADS)
87         INTEGER myByHiSave(MAX_NO_THREADS)         INTEGER myByHiSave(MAX_NO_THREADS)
88  #endif /* SINGLE_THREADED_EXCH_COMMS */         LOGICAL doingSingleThreadedComms
89    
90  #ifdef USE_SINGLE_THREADED_EXCH_COMMS         doingSingleThreadedComms = .FALSE.
91        _BARRIER  #ifdef ALLOW_USE_MPI
92        IF ( myThid .EQ. 1 ) THEN  #ifndef ALWAYS_USE_MPI
93         DO I=1,nThreads        IF ( usingMPI ) THEN
94          myBxLoSave(I) = myBxLo(I)  #endif
95          myBxHiSave(I) = myBxHi(I)  C      Set default behavior to have MPI comms done by a single thread.
96          myByLoSave(I) = myByLo(I)  C      Most MPI implementations don't support concurrent comms from
97          myByHiSave(I) = myByHi(I)  C      several threads.
98          myBxLo(I) = 0         IF ( nThreads .GT. 1 ) THEN
99          myBxHi(I) = -1          _BARRIER
100          myByLo(I) = 0          _BEGIN_MASTER( myThid )
101          myByHi(I) = -1           DO I=1,nThreads
102         ENDDO            myBxLoSave(I) = myBxLo(I)
103         myBxLo(1) = 1            myBxHiSave(I) = myBxHi(I)
104         myBxHi(1) = nSx            myByLoSave(I) = myByLo(I)
105         myByLo(1) = 1            myByHiSave(I) = myByHi(I)
106         myByHi(1) = nSy           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        ENDIF
123        _BARRIER  #ifndef ALWAYS_USE_MPI
124  #endif /* SINGLE_THREADED_EXCH_COMMS */        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 346  C--   Read from the buffers Line 361  C--   Read from the buffers
361         ENDDO         ENDDO
362        ENDDO        ENDDO
363    
364  #ifdef USE_SINGLE_THREADED_EXCH_COMMS        IF ( doingSingleThreadedComms ) THEN
365        _BARRIER  C      Restore saved settings that were stored to allow
366        IF ( myThid .EQ. 1 ) THEN  C      single thred comms.
367         DO I=1,nThreads         _BARRIER
368          myBxLo(I) = myBxLoSave(I)         _BEGIN_MASTER(myThid)
369          myBxHi(I) = myBxHiSave(I)          DO I=1,nThreads
370          myByLo(I) = myByLoSave(I)           myBxLo(I) = myBxLoSave(I)
371          myByHi(I) = myByHiSave(I)           myBxHi(I) = myBxHiSave(I)
372         ENDDO           myByLo(I) = myByLoSave(I)
373        ENDIF           myByHi(I) = myByHiSave(I)
374        _BARRIER          ENDDO
375  #endif /* USE_SINGLE_THREADED_EXCH_COMMS */         _END_MASTER(myThid)
376           _BARRIER
377          ENDIF                
378    
379        RETURN        RETURN
380        END        END
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