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C $Header$ |
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C $Name$ |
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#include "CPP_EEOPTIONS.h" |
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SUBROUTINE EXCH_RX_CUBE( |
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U array, |
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I myOLw, myOLe, myOLn, myOLs, myNz, |
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I exchWidthX, exchWidthY, |
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I simulationMode, cornerMode, myThid ) |
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C /==========================================================\ |
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C | SUBROUTINE EXCH_RX_CUBE | |
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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 | | |
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C \==========================================================/ |
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IMPLICIT NONE |
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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 == 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 theSimulationMode - Holds working copy of simulation mode |
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C theCornerMode - Holds working copy of corner mode |
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INTEGER theSimulationMode |
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INTEGER theCornerMode |
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INTEGER I,J,K |
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INTEGER bl,bt,bn,bs,be,bw |
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C == Statement function == |
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C tilemod - Permutes indices to return neighboring tile index on |
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C six face cube. |
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INTEGER tilemod |
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tilemod(I)=1+mod(I-1+6,6) |
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theSimulationMode = simulationMode |
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theCornerMode = cornerMode |
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C For now tile<->tile exchanges are sequentialised through |
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C thread 1. This is a temporary feature for preliminary testing until |
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C general tile decomposistion is in place (CNH April 11, 2001) |
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CALL BAR2( myThid ) |
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IF ( myThid .EQ. 1 ) THEN |
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DO bl = 1, 5, 2 |
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bt = bl |
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bn=tilemod(bt+2) |
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bs=tilemod(bt-1) |
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be=tilemod(bt+1) |
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bw=tilemod(bt-2) |
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DO K = 1, myNz |
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DO J = 1, sNy |
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DO I = 1, exchWidthX |
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C Tile Odd:Odd+2 [get] [North<-West] |
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array(J,sNy+I,K,bt,1) = array(I,sNy+1-J,K,bn,1) |
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C Tile Odd:Odd-1 [get] [South<-North] |
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array(J,1-I,K,bt,1) = array(J,sNy+1-I,K,bs,1) |
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C Tile Odd:Odd+1 [get] [East<-West] |
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array(sNx+I,J,K,bt,1) = array(I,J,K,be,1) |
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C Tile Odd:Odd-2 [get] [West<-North] |
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array(1-I,J,K,bt,1) = array(sNx+1-J,sNy+1-I,K,bw,1) |
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ENDDO |
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ENDDO |
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ENDDO |
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bt = bl+1 |
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bn=tilemod(bt+1) |
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bs=tilemod(bt-2) |
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be=tilemod(bt+2) |
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bw=tilemod(bt-1) |
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DO K = 1, myNz |
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DO J = 1, sNy |
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DO I = 1, exchWidthX |
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C Tile Even:Even+1 [get] [North<-South] |
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array(J,sNy+I,K,bt,1) = array(J,I,K,bn,1) |
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C Tile Even:Even-2 [get] [South<-East] |
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array(J,1-I,K,bt,1) = array(sNx+1-I,sNy+1-J,K,bs,1) |
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C Tile Even:Even+2 [get] [East<-South] |
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array(sNx+I,J,K,bt,1) = array(sNx+1-J,I,K,be,1) |
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C Tile Even:Even-1 [get] [West<-East] |
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array(1-I,J,K,bt,1) = array(sNx+1-I,J,K,bw,1) |
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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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CALL BAR2(myThid) |
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RETURN |
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END |
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