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C $Header: /u/gcmpack/MITgcm/pkg/exch2/exch2_rx1_cube_ad.template,v 1.8 2010/04/23 20:21:07 jmc Exp $ |
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C $Name: $ |
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|
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#include "CPP_EEOPTIONS.h" |
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|
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#undef Dbg |
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|
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CBOP |
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C !ROUTINE: EXCH_RX_CUBE_AD |
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|
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C !INTERFACE: |
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SUBROUTINE EXCH2_RX1_CUBE_AD( |
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U array, |
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I signOption, fieldCode, |
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I myOLw, myOLe, myOLn, myOLs, myNz, |
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I exchWidthX, exchWidthY, |
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I cornerMode, myThid ) |
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|
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C !DESCRIPTION: |
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C Scalar field (1 component) AD-Exchange: |
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C Tile-edge overlap-region of a 1 component scalar field is added to |
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C corresponding near-edge interior data point and then zero out. |
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|
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C !USES: |
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IMPLICIT NONE |
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|
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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 "W2_EXCH2_SIZE.h" |
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#include "W2_EXCH2_TOPOLOGY.h" |
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#include "W2_EXCH2_BUFFER.h" |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C array :: Array with edges to exchange. |
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C signOption :: Flag controlling whether field sign depends on orientation |
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C :: (signOption not yet implemented but needed for SM exch) |
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C fieldCode :: field code (position on staggered grid) |
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C myOLw,myOLe :: West and East overlap region sizes. |
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C myOLn,myOLs :: North and South overlap region sizes. |
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C exchWidthX :: Width of data regi exchanged in X. |
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C exchWidthY :: Width of data region exchanged in Y. |
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C cornerMode :: halo-corner-region treatment: update/ignore corner region |
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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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_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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LOGICAL signOption |
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CHARACTER*2 fieldCode |
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INTEGER exchWidthX |
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INTEGER exchWidthY |
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INTEGER cornerMode |
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INTEGER myThid |
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|
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C !LOCAL VARIABLES: |
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C e2_msgHandles :: Synchronization and coordination data structure used to |
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C :: coordinate access to e2Bufr1_RX or to regulate message |
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C :: buffering. In PUT communication sender will increment |
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C :: handle entry once data is ready in buffer. Receiver will |
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C :: decrement handle once data is consumed from buffer. |
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C :: For MPI MSG communication MPI_Wait uses handle to check |
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C :: Isend has cleared. This is done in routine after receives. |
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C note: a) current implementation does not use e2_msgHandles for communication |
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C between threads: all-threads barriers are used (see CNH note below). |
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C For a 2-threads synchro communication (future version), |
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C e2_msgHandles should be shared (in common block, moved to BUFFER.h) |
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C b) 1rst dim=2 so that it could be used also by exch2_rx2_cube. |
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INTEGER bi, bj |
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C Variables for working through W2 topology |
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INTEGER e2_msgHandles( 2, W2_maxNeighbours, nSx, nSy ) |
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INTEGER thisTile, farTile, N, nN, oN |
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INTEGER tIlo, tIhi, tJlo, tJhi, tKlo, tKhi |
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INTEGER tIStride, tJStride, tKStride |
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INTEGER i1Lo, i1Hi, j1Lo, j1Hi, k1Lo, k1Hi |
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LOGICAL updateCorners |
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|
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#ifdef ALLOW_USE_MPI |
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INTEGER iBufr, nri, nrj |
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C MPI stuff (should be in a routine call) |
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INTEGER mpiStatus(MPI_STATUS_SIZE) |
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INTEGER mpiRc |
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INTEGER wHandle |
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#endif |
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CEOP |
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|
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updateCorners = cornerMode .EQ. EXCH_UPDATE_CORNERS |
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C- Tile size of array to exchange: |
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i1Lo = 1-myOLw |
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i1Hi = sNx+myOLe |
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j1Lo = 1-myOLs |
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j1Hi = sNy+myOLn |
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k1Lo = 1 |
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k1Hi = myNz |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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C Prevent anyone to access shared buffer while an other thread modifies it |
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CALL BAR2( myThid ) |
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|
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C-- Extract from buffer (either from level 1 if local exch, |
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C or level 2 if coming from an other Proc) |
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C AD: = fill buffer from my-tile-edge overlap-region, level 1 or 2 depending |
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C AD: on local (to this Proc) or remote Proc tile destination |
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DO bj=myByLo(myThid), myByHi(myThid) |
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DO bi=myBxLo(myThid), myBxHi(myThid) |
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thisTile=W2_myTileList(bi,bj) |
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nN=exch2_nNeighbours(thisTile) |
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DO N=1,nN |
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CALL EXCH2_GET_SCAL_BOUNDS( |
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I fieldCode, exchWidthX, updateCorners, |
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I thisTile, N, |
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O tIlo, tiHi, tjLo, tjHi, |
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O tiStride, tjStride, |
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I myThid ) |
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tKLo=1 |
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tKHi=myNz |
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tKStride=1 |
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|
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C From buffer, get my points |
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C (tIlo:tIhi:tiStride,tJlo:tJhi,tJStride,tKlo:tKhi,tKStride) in "array": |
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C Note: when transferring data within a process: |
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C o e2Bufr entry to read is entry associated with opposing send record |
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C o e2_msgHandle entry to read is entry associated with opposing send record. |
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CALL EXCH2_AD_GET_RX1( |
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I tIlo, tIhi, tiStride, |
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I tJlo, tJhi, tjStride, |
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I tKlo, tKhi, tkStride, |
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I thisTile, N, bi, bj, |
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I e2BufrRecSize, W2_maxNeighbours, nSx, nSy, |
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O iBuf1Filled(N,bi,bj), |
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O e2Bufr1_RX, |
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U array(1-myOLw,1-myOLs,1,bi,bj), |
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I i1Lo, i1Hi, j1Lo, j1Hi, k1Lo, k1Hi, |
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U e2_msgHandles, |
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I W2_myCommFlag(N,bi,bj), myThid ) |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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C Wait until all threads finish filling buffer |
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CALL BAR2( myThid ) |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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#ifdef ALLOW_USE_MPI |
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C AD: all MPI part is acting on buffer and is identical to forward code, |
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C AD: except a) the buffer level: send from lev.2, receive into lev.1 |
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C AD: b) the length of transferred buffer (<- match the ad_put/ad_get) |
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|
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_BEGIN_MASTER( myThid ) |
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|
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C-- Send my data (in buffer, level 2) to target Process |
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DO bj=1,nSy |
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DO bi=1,nSx |
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thisTile=W2_myTileList(bi,bj) |
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nN=exch2_nNeighbours(thisTile) |
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DO N=1,nN |
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C- Skip the call if this is an internal exchange |
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IF ( W2_myCommFlag(N,bi,bj) .EQ. 'M' ) THEN |
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CALL EXCH2_SEND_RX1( |
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I thisTile, N, |
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I e2BufrRecSize, |
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I iBuf1Filled(N,bi,bj), |
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I e2Bufr1_RX(1,N,bi,bj,2), |
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O e2_msgHandles(1,N,bi,bj), |
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I W2_myCommFlag(N,bi,bj), myThid ) |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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C-- Receive data (in buffer, level 1) from source Process |
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DO bj=1,nSy |
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DO bi=1,nSx |
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thisTile=W2_myTileList(bi,bj) |
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nN=exch2_nNeighbours(thisTile) |
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DO N=1,nN |
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C- Skip the call if this is an internal exchange |
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IF ( W2_myCommFlag(N,bi,bj) .EQ. 'M' ) THEN |
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farTile=exch2_neighbourId(N,thisTile) |
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oN = exch2_opposingSend(N,thisTile) |
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CALL EXCH2_GET_SCAL_BOUNDS( |
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I fieldCode, exchWidthX, updateCorners, |
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I farTile, oN, |
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O tIlo, tiHi, tjLo, tjHi, |
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O tiStride, tjStride, |
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I myThid ) |
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nri = 1 + (tIhi-tIlo)/tiStride |
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nrj = 1 + (tJhi-tJlo)/tjStride |
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iBufr = nri*nrj*myNz |
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C Receive from neighbour N to fill buffer and later on the array |
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CALL EXCH2_RECV_RX1( |
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I thisTile, N, |
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I e2BufrRecSize, |
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I iBufr, |
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O e2Bufr1_RX(1,N,bi,bj,1), |
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I W2_myCommFlag(N,bi,bj), myThid ) |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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C-- Clear message handles/locks |
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DO bj=1,nSy |
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DO bi=1,nSx |
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thisTile=W2_myTileList(bi,bj) |
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nN=exch2_nNeighbours(thisTile) |
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DO N=1,nN |
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C Note: In a between process tile-tile data transport using |
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C MPI the sender needs to clear an Isend wait handle here. |
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C In a within process tile-tile data transport using true |
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C shared address space/or direct transfer through commonly |
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C addressable memory blocks the receiver needs to assert |
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C that he has consumed the buffer the sender filled here. |
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c farTile=exch2_neighbourId(N,thisTile) |
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IF ( W2_myCommFlag(N,bi,bj) .EQ. 'M' ) THEN |
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wHandle = e2_msgHandles(1,N,bi,bj) |
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CALL MPI_Wait( wHandle, mpiStatus, mpiRc ) |
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ELSEIF ( W2_myCommFlag(N,bi,bj) .EQ. 'P' ) THEN |
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ELSE |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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_END_MASTER( myThid ) |
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C Everyone waits until master-thread finishes receiving |
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CALL BAR2( myThid ) |
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|
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#endif /* ALLOW_USE_MPI */ |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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C-- Post sends into buffer (buffer level 1): |
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C- AD: = get exch-data from buffer (level 1), formerly in source tile |
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C AD: overlap region, and add to my tile near-Edge interior |
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DO bj=myByLo(myThid), myByHi(myThid) |
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DO bi=myBxLo(myThid), myBxHi(myThid) |
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thisTile=W2_myTileList(bi,bj) |
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nN=exch2_nNeighbours(thisTile) |
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DO N=1,nN |
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farTile=exch2_neighbourId(N,thisTile) |
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oN = exch2_opposingSend(N,thisTile) |
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CALL EXCH2_GET_SCAL_BOUNDS( |
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I fieldCode, exchWidthX, updateCorners, |
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I farTile, oN, |
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O tIlo, tiHi, tjLo, tjHi, |
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O tiStride, tjStride, |
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I myThid ) |
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tKLo=1 |
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tKHi=myNz |
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tKStride=1 |
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C- Put my points in buffer for neighbour N to fill points |
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C (tIlo:tIhi:tiStride,tJlo:tJhi,tJStride,tKlo:tKhi,tKStride) |
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C in its copy of "array". |
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CALL EXCH2_AD_PUT_RX1( |
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I tIlo, tIhi, tiStride, |
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I tJlo, tJhi, tjStride, |
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I tKlo, tKhi, tkStride, |
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I thisTile, N, |
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I e2BufrRecSize, |
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I e2Bufr1_RX(1,N,bi,bj,1), |
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U array(1-myOLw,1-myOLs,1,bi,bj), |
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I i1Lo, i1Hi, j1Lo, j1Hi, k1Lo, k1Hi, |
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O e2_msgHandles(1,N,bi,bj), |
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I W2_myCommFlag(N,bi,bj), myThid ) |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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RETURN |
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END |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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CEH3 ;;; Local Variables: *** |
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CEH3 ;;; mode:fortran *** |
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CEH3 ;;; End: *** |
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