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C $Header: /u/gcmpack/MITgcm/eesupp/src/exch_rx.template,v 1.4 2002/04/30 22:48:20 jmc Exp $ |
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C $Name: $ |
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#include "CPP_EEOPTIONS.h" |
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CBOP |
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C !ROUTINE: EXCH_RX |
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C !INTERFACE: |
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SUBROUTINE EXCH_RX( |
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U array, |
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I myOLw, myOLe, myOLs, myOLn, myNz, |
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I exchWidthX, exchWidthY, |
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I simulationMode, cornerMode, myThid ) |
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IMPLICIT NONE |
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C !DESCRIPTION: |
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C *==========================================================* |
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C | SUBROUTINE EXCH_RX |
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C | o Control edge exchanges for RX array. |
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C *==========================================================* |
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C | |
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C | Controlling routine for exchange of XY edges of an array |
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C | distributed in X and Y. The routine interfaces to |
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C | communication routines that can use messages passing |
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C | exchanges, put type exchanges or get type exchanges. |
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C | This allows anything from MPI to raw memory channel to |
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C | memmap segments to be used as a inter-process and/or |
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C | inter-thread communiation and synchronisation |
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C | mechanism. |
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C | Notes -- |
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C | 1. Some low-level mechanisms such as raw memory-channel |
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C | or SGI/CRAY shmem put do not have direct Fortran bindings |
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C | and are invoked through C stub routines. |
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C | 2. Although this routine is fairly general but it does |
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C | require nSx and nSy are the same for all innvocations. |
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C | There are many common data structures ( myByLo, |
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C | westCommunicationMode, mpiIdW etc... ) tied in with |
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C | (nSx,nSy). To support arbitray nSx and nSy would require |
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C | general forms of these. |
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C | 3. RX arrays are used to generate code for both _RL and |
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C | _RS forms. |
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C *==========================================================* |
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C !USES: |
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C == Global data == |
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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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#include "EXCH.h" |
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments == |
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C array :: Array with edges to exchange. |
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C myOLw :: West, East, North and South overlap region sizes. |
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C myOLe |
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C myOLn |
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C myOLs |
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C exchWidthX :: Width of data region exchanged in X. |
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C exchWidthY :: Width of data region exchanged in Y. |
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C Note -- |
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C 1. In theory one could have a send width and |
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C a receive width for each face of each tile. The only |
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C restriction woul be that the send width of one |
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C face should equal the receive width of the sent to |
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C tile face. Dont know if this would be useful. I |
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C have left it out for now as it requires additional |
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C bookeeping. |
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C simulationMode :: Forward or reverse mode exchange ( provides |
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C support for adjoint integration of code. ) |
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C cornerMode :: Flag indicating whether corner updates are |
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C needed. |
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C myThid :: Thread number of this instance of S/R EXCH... |
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INTEGER myOLw |
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INTEGER myOLe |
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INTEGER myOLs |
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INTEGER myOLn |
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INTEGER myNz |
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INTEGER exchWidthX |
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INTEGER exchWidthY |
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INTEGER simulationMode |
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INTEGER cornerMode |
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INTEGER myThid |
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_RX array(1-myOLw:sNx+myOLe, |
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& 1-myOLs:sNy+myOLn, |
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& myNZ, nSx, nSy) |
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C !LOCAL VARIABLES: |
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C == Local variables == |
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C theSimulationMode :: Holds working copy of simulation mode |
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C theCornerMode :: Holds working copy of corner mode |
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C I,J,K,bi,bj :: Loop counters |
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INTEGER theSimulationMode |
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INTEGER theCornerMode |
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INTEGER I,J,K,bi,bj |
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CEOP |
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_BARRIER |
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theSimulationMode = simulationMode |
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theCornerMode = cornerMode |
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C-- Error checks |
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IF ( exchWidthX .GT. myOLw ) |
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& STOP ' S/R EXCH_RX: exchWidthX .GT. myOLw' |
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IF ( exchWidthX .GT. myOLe ) |
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& STOP ' S/R EXCH_RX: exchWidthX .GT. myOLe' |
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IF ( exchWidthY .GT. myOLs ) |
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& STOP ' S/R EXCH_RX: exchWidthY .GT. myOLs' |
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IF ( exchWidthY .GT. myOLn ) |
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& STOP ' S/R EXCH_RX: exchWidthY .GT. myOLn' |
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IF ( myOLw .GT. MAX_OLX_EXCH ) |
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& STOP ' S/R EXCH_RX: myOLw .GT. MAX_OLX_EXCH' |
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IF ( myOLe .GT. MAX_OLX_EXCH ) |
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& STOP ' S/R EXCH_RX: myOLe .GT. MAX_OLX_EXCH' |
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IF ( myOLn .GT. MAX_OLX_EXCH ) |
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& STOP ' S/R EXCH_RX: myOLn .GT. MAX_OLY_EXCH' |
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IF ( myOLs .GT. MAX_OLY_EXCH ) |
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& STOP ' S/R EXCH_RX: myOLs .GT. MAX_OLY_EXCH' |
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IF ( myNZ .GT. MAX_NR_EXCH ) |
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& STOP ' S/R EXCH_RX: myNZ .GT. MAX_NR_EXCH ' |
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IF ( theSimulationMode .NE. FORWARD_SIMULATION |
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& .AND. theSimulationMode .NE. REVERSE_SIMULATION |
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& ) STOP ' S/R EXCH_RX: Unrecognised simulationMode ' |
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IF ( theCornerMode .NE. EXCH_IGNORE_CORNERS |
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& .AND. theCornerMode .NE. EXCH_UPDATE_CORNERS |
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& ) STOP ' S/R EXCH_RX: Unrecognised cornerMode ' |
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C-- Cycle edge buffer level |
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CALL EXCH_CYCLE_EBL( myThid ) |
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IF ( theSimulationMode .EQ. FORWARD_SIMULATION ) THEN |
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C-- "Put" east and west edges. |
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CALL EXCH_RX_SEND_PUT_X( array, |
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I myOLw, myOLe, myOLs, myOLn, myNz, |
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I exchWidthX, exchWidthY, |
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I theSimulationMode, theCornerMode, myThid ) |
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C-- If corners are important then sync and update east and west edges |
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C-- before doing north and south exchanges. |
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IF ( theCornerMode .EQ. EXCH_UPDATE_CORNERS ) THEN |
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CALL EXCH_RX_RECV_GET_X( array, |
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I myOLw, myOLe, myOLs, myOLn, myNz, |
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I exchWidthX, exchWidthY, |
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I theSimulationMode, theCornerMode, myThid ) |
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ENDIF |
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C "Put" north and south edges. |
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CALL EXCH_RX_SEND_PUT_Y( array, |
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I myOLw, myOLe, myOLs, myOLn, myNz, |
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I exchWidthX, exchWidthY, |
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I theSimulationMode, theCornerMode, myThid ) |
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C-- Sync and update north, south (and east, west if corner updating |
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C-- not active). |
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IF ( theCornerMode .NE. EXCH_UPDATE_CORNERS ) THEN |
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CALL EXCH_RX_RECV_GET_X( array, |
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I myOLw, myOLe, myOLs, myOLn, myNz, |
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I exchWidthX, exchWidthY, |
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I theSimulationMode, theCornerMode, myThid ) |
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ENDIF |
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CALL EXCH_RX_RECV_GET_Y( array, |
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I myOLw, myOLe, myOLs, myOLn, myNz, |
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I exchWidthX, exchWidthY, |
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I theSimulationMode, theCornerMode, myThid ) |
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ENDIF |
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IF ( theSimulationMode .EQ. REVERSE_SIMULATION ) THEN |
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C "Put" north and south edges. |
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CALL EXCH_RX_SEND_PUT_Y( array, |
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I myOLw, myOLe, myOLs, myOLn, myNz, |
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I exchWidthX, exchWidthY, |
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I theSimulationMode, theCornerMode, myThid ) |
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C-- If corners are important then sync and update east and west edges |
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C-- before doing north and south exchanges. |
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IF ( theCornerMode .EQ. EXCH_UPDATE_CORNERS ) THEN |
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CALL EXCH_RX_RECV_GET_Y( array, |
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I myOLw, myOLe, myOLs, myOLn, myNz, |
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I exchWidthX, exchWidthY, |
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I theSimulationMode, theCornerMode, myThid ) |
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ENDIF |
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C-- "Put" east and west edges. |
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CALL EXCH_RX_SEND_PUT_X( array, |
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I myOLw, myOLe, myOLs, myOLn, myNz, |
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I exchWidthX, exchWidthY, |
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I theSimulationMode, theCornerMode, myThid ) |
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C-- Sync and update east, west (and north, south if corner updating |
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C-- not active). |
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IF ( theCornerMode .NE. EXCH_UPDATE_CORNERS ) THEN |
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CALL EXCH_RX_RECV_GET_Y( array, |
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I myOLw, myOLe, myOLs, myOLn, myNz, |
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I exchWidthX, exchWidthY, |
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I theSimulationMode, theCornerMode, myThid ) |
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ENDIF |
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CALL EXCH_RX_RECV_GET_X( array, |
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I myOLw, myOLe, myOLs, myOLn, myNz, |
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I exchWidthX, exchWidthY, |
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I theSimulationMode, theCornerMode, myThid ) |
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ENDIF |
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jmc |
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C Special case for zonal average model i.e. case where Nx == 1 |
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C In this case a forward mode exchange simply sets array to |
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C the i=1 value for all i. |
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IF ( Nx .EQ. 1 ) THEN |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO K = 1,myNz |
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DO J = 1-myOLs,sNy+myOLn |
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DO I = 1-myOLw,sNx+myOLe |
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array(I,J,K,bi,bj) = array(1,J,K,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDIF |
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C Special case for X-slice domain i.e. case where Ny == 1 |
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C In this case a forward mode exchange simply sets array to |
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C the j=1 value for all j. |
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IF ( Ny .EQ. 1 ) THEN |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO K = 1,myNz |
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DO J = 1-myOLs,sNy+myOLn |
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DO I = 1-myOLw,sNx+myOLe |
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array(I,J,K,bi,bj) = array(I,1,K,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDIF |
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RETURN |
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END |
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