| 1 |
C $Header: /u/gcmpack/models/MITgcmUV/eesupp/src/exch_send_put_y.F,v 1.1 1998/09/29 18:53:45 cnh Exp $ |
| 2 |
#include "CPP_EEOPTIONS.h" |
| 3 |
|
| 4 |
SUBROUTINE EXCH_RL_SEND_PUT_Y( array, |
| 5 |
I myOLw, myOLe, myOLs, myOLn, myNz, |
| 6 |
I exchWidthX, exchWidthY, |
| 7 |
I thesimulationMode, thecornerMode, myThid ) |
| 8 |
C /==========================================================\ |
| 9 |
C | SUBROUTINE SEND_PUT_Y | |
| 10 |
C | o "Send" or "put" Y edges for RL array. | |
| 11 |
C |==========================================================| |
| 12 |
C | Routine that invokes actual message passing send or | |
| 13 |
C | direct "put" of data to update Y faces of an XY[R] array.| |
| 14 |
C \==========================================================/ |
| 15 |
IMPLICIT NONE |
| 16 |
|
| 17 |
C == Global variables == |
| 18 |
#include "SIZE.h" |
| 19 |
#include "EEPARAMS.h" |
| 20 |
#include "EESUPPORT.h" |
| 21 |
#include "EXCH.h" |
| 22 |
C == Routine arguments == |
| 23 |
C array - Array with edges to exchange. |
| 24 |
C myOLw - West, East, North and South overlap region sizes. |
| 25 |
C myOLe |
| 26 |
C myOLn |
| 27 |
C myOLs |
| 28 |
C exchWidthX - Width of data region exchanged. |
| 29 |
C exchWidthY |
| 30 |
C theSimulationMode - Forward or reverse mode exchange ( provides |
| 31 |
C support for adjoint integration of code. ) |
| 32 |
C Note - the reverse mode for an assignment |
| 33 |
C is an accumulation. This means that |
| 34 |
C put implementations that do leary things |
| 35 |
C like writing to overlap regions in a |
| 36 |
C remote process need to be even more |
| 37 |
C careful. You need to be pretty careful |
| 38 |
C in forward mode too! |
| 39 |
C theCornerMode - Flag indicating whether corner updates are |
| 40 |
C needed. |
| 41 |
C myThid - Thread number of this instance of S/R EXCH... |
| 42 |
C eBl - Edge buffer level |
| 43 |
INTEGER myOLw |
| 44 |
INTEGER myOLe |
| 45 |
INTEGER myOLs |
| 46 |
INTEGER myOLn |
| 47 |
INTEGER myNz |
| 48 |
_RL array(1-myOLw:sNx+myOLe, |
| 49 |
& 1-myOLs:sNy+myOLn, |
| 50 |
& myNZ, nSx, nSy) |
| 51 |
INTEGER exchWidthX |
| 52 |
INTEGER exchWidthY |
| 53 |
INTEGER theSimulationMode |
| 54 |
INTEGER theCornerMode |
| 55 |
INTEGER myThid |
| 56 |
CEndOfInterface |
| 57 |
|
| 58 |
C == Local variables == |
| 59 |
C I, J, K, jMin, jMax, iB - Loop counters and extents |
| 60 |
C bi, bj |
| 61 |
C biS, bjS - South tile indices |
| 62 |
C biN, bjN - North tile indices |
| 63 |
C eBl - Current exchange buffer level |
| 64 |
C theProc, theTag, theType, - Variables used in message building |
| 65 |
C theSize |
| 66 |
C southCommMode - Working variables holding type |
| 67 |
C northCommMode of communication a particular |
| 68 |
C tile face uses. |
| 69 |
INTEGER I, J, K, jMin, jMax, iMin, iMax, iB |
| 70 |
INTEGER bi, bj, biS, bjS, biN, bjN |
| 71 |
INTEGER eBl |
| 72 |
INTEGER northCommMode |
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INTEGER southCommMode |
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|
| 75 |
#ifdef ALLOW_USE_MPI |
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INTEGER theProc, theTag, theType, theSize, mpiRc |
| 77 |
#endif |
| 78 |
|
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C-- Write data to exchange buffer |
| 80 |
C Various actions are possible depending on the communication mode |
| 81 |
C as follows: |
| 82 |
C Mode Action |
| 83 |
C -------- --------------------------- |
| 84 |
C COMM_NONE Do nothing |
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C |
| 86 |
C COMM_MSG Message passing communication ( e.g. MPI ) |
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C Fill south send buffer from this tile. |
| 88 |
C Send data with tag identifying tile and direction. |
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C Fill north send buffer from this tile. |
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C Send data with tag identifying tile and direction. |
| 91 |
C |
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C COMM_PUT "Put" communication ( UMP_, shmemput, etc... ) |
| 93 |
C Fill south receive buffer of south-neighbor tile |
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C Fill north receive buffer of north-neighbor tile |
| 95 |
C Sync. memory |
| 96 |
C Write data-ready Ack for north edge of south-neighbor |
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C tile |
| 98 |
C Write data-ready Ack for south edge of north-neighbor |
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C tile |
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C Sync. memory |
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C |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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|
| 105 |
ebL = exchangeBufLevel(1,bi,bj) |
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southCommMode = _tileCommModeS(bi,bj) |
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northCommMode = _tileCommModeN(bi,bj) |
| 108 |
biS = _tileBiS(bi,bj) |
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bjS = _tileBjS(bi,bj) |
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biN = _tileBiN(bi,bj) |
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bjN = _tileBjN(bi,bj) |
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iMin = 1 |
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iMax = sNx |
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IF ( theCornerMode .EQ. EXCH_UPDATE_CORNERS ) THEN |
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iMin = 1-exchWidthX |
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iMax = sNx+exchWidthX |
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ENDIF |
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|
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C o Send or Put south edge |
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IF ( _theSimulationMode .EQ. FORWARD_SIMULATION ) THEN |
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jMin = 1 |
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jMax = 1+exchWidthY-1 |
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ELSEIF ( _theSimulationMode .EQ. REVERSE_SIMULATION ) THEN |
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jMin = 1-exchWidthY |
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jMax = 0 |
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ENDIF |
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IF ( southCommMode .EQ. COMM_MSG ) THEN |
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iB = 0 |
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DO K=1,myNz |
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DO J=jMin,jMax |
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DO I=iMin,iMax |
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iB = iB + 1 |
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southSendBuf_RL(iB,eBl,bi,bj) = array(I,J,K,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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C Send the data |
| 138 |
#ifdef ALLOW_USE_MPI |
| 139 |
#ifndef ALWAYS_USE_MPI |
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IF ( usingMPI ) THEN |
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#endif |
| 142 |
theProc = tilePidS(bi,bj) |
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theTag = _tileTagSendS(bi,bj) |
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theSize = iB |
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theType = MPI_DOUBLE_PRECISION |
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exchNreqsY(1,bi,bj) = exchNreqsY(1,bi,bj)+1 |
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CALL MPI_Isend(southSendBuf_RL(1,eBl,bi,bj), theSize, theType, |
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& theProc, theTag, MPI_COMM_WORLD, |
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& exchReqIdY(exchNreqsY(1,bi,bj),1,bi,bj), mpiRc) |
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#ifndef ALWAYS_USE_MPI |
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ENDIF |
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#endif |
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#endif /* ALLOW_USE_MPI */ |
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northRecvAck(eBl,biS,bjS) = 1. |
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ELSEIF ( southCommMode .EQ. COMM_PUT ) THEN |
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iB = 0 |
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DO K=1,myNz |
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DO J=jMin,jMax |
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DO I=iMin,iMax |
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iB = iB + 1 |
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northRecvBuf_RL(iB,eBl,biS,bjS) = array(I,J,K,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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ELSEIF ( southCommMode .NE. COMM_NONE |
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& .AND. southCommMode .NE. COMM_GET ) THEN |
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STOP ' S/R EXCH: Invalid commS mode.' |
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ENDIF |
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|
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C o Send or Put north edge |
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IF ( _theSimulationMode .EQ. FORWARD_SIMULATION ) THEN |
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jMin = sNy-exchWidthY+1 |
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jMax = sNy |
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ELSEIF ( _theSimulationMode .EQ. REVERSE_SIMULATION ) THEN |
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jMin = sNy+1 |
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jMax = sNy+exchWidthY |
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ENDIF |
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IF ( northCommMode .EQ. COMM_MSG ) THEN |
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iB = 0 |
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DO K=1,myNz |
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DO J=jMin,jMax |
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DO I=iMin,iMax |
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iB = iB + 1 |
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northSendBuf_RL(iB,eBl,bi,bj) = array(I,J,K,bi,bj) |
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ENDDO |
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ENDDO |
| 187 |
ENDDO |
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C Send the data |
| 189 |
#ifdef ALLOW_USE_MPI |
| 190 |
#ifndef ALWAYS_USE_MPI |
| 191 |
IF ( usingMPI ) THEN |
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#endif |
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theProc = tilePidN(bi,bj) |
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theTag = _tileTagSendN(bi,bj) |
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theSize = iB |
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theType = MPI_DOUBLE_PRECISION |
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exchNreqsY(1,bi,bj) = exchNreqsY(1,bi,bj)+1 |
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CALL MPI_Isend(northSendBuf_RL(1,eBl,bi,bj), theSize, theType, |
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& theProc, theTag, MPI_COMM_WORLD, |
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& exchReqIdY(exchNreqsY(1,bi,bj),1,bi,bj), mpiRc ) |
| 201 |
#ifndef ALWAYS_USE_MPI |
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ENDIF |
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#endif |
| 204 |
#endif /* ALLOW_USE_MPI */ |
| 205 |
southRecvAck(eBl,biN,bjN) = 1. |
| 206 |
ELSEIF ( northCommMode .EQ. COMM_PUT ) THEN |
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iB = 0 |
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DO K=1,myNz |
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DO J=jMin,jMax |
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DO I=iMin,iMax |
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iB = iB + 1 |
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southRecvBuf_RL(iB,eBl,biN,bjN) = array(I,J,K,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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ELSEIF ( northCommMode .NE. COMM_NONE |
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& .AND. northCommMode .NE. COMM_GET ) THEN |
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STOP ' S/R EXCH: Invalid commN mode.' |
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ENDIF |
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|
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ENDDO |
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ENDDO |
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|
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C-- Signal completetion ( making sure system-wide memory state is |
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C-- consistent ). |
| 226 |
|
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C ** NOTE ** We are relying on being able to produce strong-ordered |
| 228 |
C memory semantics here. In other words we assume that there is a |
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C mechanism which can ensure that by the time the Ack is seen the |
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C overlap region data that will be exchanged is up to date. |
| 231 |
IF ( exchNeedsMemSync ) CALL MEMSYNC |
| 232 |
|
| 233 |
DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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ebL = exchangeBufLevel(1,bi,bj) |
| 236 |
biS = _tileBiS(bi,bj) |
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bjS = _tileBjS(bi,bj) |
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biN = _tileBiN(bi,bj) |
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bjN = _tileBjN(bi,bj) |
| 240 |
southCommMode = _tileCommModeS(bi,bj) |
| 241 |
northCommMode = _tileCommModeN(bi,bj) |
| 242 |
IF ( southCommMode .EQ. COMM_PUT ) northRecvAck(eBl,biS,bjS) = 1. |
| 243 |
IF ( northCommMode .EQ. COMM_PUT ) southRecvAck(eBl,biN,bjN) = 1. |
| 244 |
IF ( southCommMode .EQ. COMM_GET ) northRecvAck(eBl,biS,bjS) = 1. |
| 245 |
IF ( northCommMode .EQ. COMM_GET ) southRecvAck(eBl,biN,bjN) = 1. |
| 246 |
ENDDO |
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ENDDO |
| 248 |
|
| 249 |
C-- Make sure "ack" setting is seen system-wide. |
| 250 |
C Here strong-ordering is not an issue but we want to make |
| 251 |
C sure that processes that might spin on the above Ack settings |
| 252 |
C will see the setting. |
| 253 |
C ** NOTE ** On some machines we wont spin on the Ack setting |
| 254 |
C ( particularly the T90 ), instead we will use s system barrier. |
| 255 |
C On the T90 the system barrier is very fast and switches out the |
| 256 |
C thread while it waits. On most machines the system barrier |
| 257 |
C is much too slow and if we own the machine and have one thread |
| 258 |
C per process preemption is not a problem. |
| 259 |
IF ( exchNeedsMemSync ) CALL MEMSYNC |
| 260 |
|
| 261 |
RETURN |
| 262 |
END |
| 263 |
|
| 264 |
SUBROUTINE EXCH_RS_SEND_PUT_Y( array, |
| 265 |
I myOLw, myOLe, myOLs, myOLn, myNz, |
| 266 |
I exchWidthX, exchWidthY, |
| 267 |
I thesimulationMode, thecornerMode, myThid ) |
| 268 |
C /==========================================================\ |
| 269 |
C | SUBROUTINE SEND_PUT_Y | |
| 270 |
C | o "Send" or "put" Y edges for RS array. | |
| 271 |
C |==========================================================| |
| 272 |
C | Routine that invokes actual message passing send or | |
| 273 |
C | direct "put" of data to update Y faces of an XY[R] array.| |
| 274 |
C \==========================================================/ |
| 275 |
IMPLICIT NONE |
| 276 |
|
| 277 |
C == Global variables == |
| 278 |
#include "SIZE.h" |
| 279 |
#include "EEPARAMS.h" |
| 280 |
#include "EESUPPORT.h" |
| 281 |
#include "EXCH.h" |
| 282 |
C == Routine arguments == |
| 283 |
C array - Array with edges to exchange. |
| 284 |
C myOLw - West, East, North and South overlap region sizes. |
| 285 |
C myOLe |
| 286 |
C myOLn |
| 287 |
C myOLs |
| 288 |
C exchWidthX - Width of data region exchanged. |
| 289 |
C exchWidthY |
| 290 |
C theSimulationMode - Forward or reverse mode exchange ( provides |
| 291 |
C support for adjoint integration of code. ) |
| 292 |
C theCornerMode - Flag indicating whether corner updates are |
| 293 |
C needed. |
| 294 |
C myThid - Thread number of this instance of S/R EXCH... |
| 295 |
C eBl - Edge buffer level |
| 296 |
INTEGER myOLw |
| 297 |
INTEGER myOLe |
| 298 |
INTEGER myOLs |
| 299 |
INTEGER myOLn |
| 300 |
INTEGER myNz |
| 301 |
_RS array(1-myOLw:sNx+myOLe, |
| 302 |
& 1-myOLs:sNy+myOLn, |
| 303 |
& myNZ, nSx, nSy) |
| 304 |
INTEGER exchWidthX |
| 305 |
INTEGER exchWidthY |
| 306 |
INTEGER theSimulationMode |
| 307 |
INTEGER theCornerMode |
| 308 |
INTEGER myThid |
| 309 |
CEndOfInterface |
| 310 |
|
| 311 |
C == Local variables == |
| 312 |
C I, J, K, jMin, jMax, iB - Loop counters and extents |
| 313 |
C bi, bj |
| 314 |
C biS, bjS - South tile indices |
| 315 |
C biN, bjN - North tile indices |
| 316 |
C eBl - Current exchange buffer level |
| 317 |
C theProc, theTag, theType, - Variables used in message building |
| 318 |
C theSize |
| 319 |
C southCommMode - Working variables holding type |
| 320 |
C northCommMode of communication a particular |
| 321 |
C tile face uses. |
| 322 |
INTEGER I, J, K, jMin, jMax, iMin, iMax, iB |
| 323 |
INTEGER bi, bj, biS, bjS, biN, bjN |
| 324 |
INTEGER eBl |
| 325 |
INTEGER northCommMode |
| 326 |
INTEGER southCommMode |
| 327 |
|
| 328 |
#ifdef ALLOW_USE_MPI |
| 329 |
INTEGER theProc, theTag, theType, theSize, mpiRc |
| 330 |
#endif |
| 331 |
|
| 332 |
C-- Write data to exchange buffer |
| 333 |
C Various actions are possible depending on the communication mode |
| 334 |
C as follows: |
| 335 |
C Mode Action |
| 336 |
C -------- --------------------------- |
| 337 |
C COMM_NONE Do nothing |
| 338 |
C |
| 339 |
C COMM_MSG Message passing communication ( e.g. MPI ) |
| 340 |
C Fill south send buffer from this tile. |
| 341 |
C Send data with tag identifying tile and direction. |
| 342 |
C Fill north send buffer from this tile. |
| 343 |
C Send data with tag identifying tile and direction. |
| 344 |
C |
| 345 |
C COMM_PUT "Put" communication ( UMP_, shmemput, etc... ) |
| 346 |
C Fill south receive buffer of south-neighbor tile |
| 347 |
C Fill north receive buffer of north-neighbor tile |
| 348 |
C Sync. memory |
| 349 |
C Write data-ready Ack for north edge of south-neighbor |
| 350 |
C tile |
| 351 |
C Write data-ready Ack for south edge of north-neighbor |
| 352 |
C tile |
| 353 |
C Sync. memory |
| 354 |
C |
| 355 |
DO bj=myByLo(myThid),myByHi(myThid) |
| 356 |
DO bi=myBxLo(myThid),myBxHi(myThid) |
| 357 |
|
| 358 |
ebL = exchangeBufLevel(1,bi,bj) |
| 359 |
southCommMode = _tileCommModeS(bi,bj) |
| 360 |
northCommMode = _tileCommModeN(bi,bj) |
| 361 |
biS = _tileBiS(bi,bj) |
| 362 |
bjS = _tileBjS(bi,bj) |
| 363 |
biN = _tileBiN(bi,bj) |
| 364 |
bjN = _tileBjN(bi,bj) |
| 365 |
iMin = 1 |
| 366 |
iMax = sNx |
| 367 |
IF ( theCornerMode .EQ. EXCH_UPDATE_CORNERS ) THEN |
| 368 |
iMin = 1-exchWidthX |
| 369 |
iMax = sNx+exchWidthX |
| 370 |
ENDIF |
| 371 |
|
| 372 |
C o Send or Put south edge |
| 373 |
IF ( _theSimulationMode .EQ. FORWARD_SIMULATION ) THEN |
| 374 |
jMin = 1 |
| 375 |
jMax = 1+exchWidthY-1 |
| 376 |
ELSEIF ( _theSimulationMode .EQ. REVERSE_SIMULATION ) THEN |
| 377 |
jMin = 1-exchWidthY |
| 378 |
jMax = 0 |
| 379 |
ENDIF |
| 380 |
IF ( southCommMode .EQ. COMM_MSG ) THEN |
| 381 |
iB = 0 |
| 382 |
DO K=1,myNz |
| 383 |
DO J=jMin,jMax |
| 384 |
DO I=iMin,iMax |
| 385 |
iB = iB + 1 |
| 386 |
southSendBuf_RS(iB,eBl,bi,bj) = array(I,J,K,bi,bj) |
| 387 |
ENDDO |
| 388 |
ENDDO |
| 389 |
ENDDO |
| 390 |
C Send the data |
| 391 |
#ifdef ALLOW_USE_MPI |
| 392 |
#ifndef ALWAYS_USE_MPI |
| 393 |
IF ( usingMPI ) THEN |
| 394 |
#endif |
| 395 |
theProc = tilePidS(bi,bj) |
| 396 |
theTag = _tileTagSendS(bi,bj) |
| 397 |
theSize = iB |
| 398 |
theType = MPI_DOUBLE_PRECISION |
| 399 |
#ifdef RS_IS_REAL4 |
| 400 |
theType = MPI_REAL4 |
| 401 |
#endif |
| 402 |
exchNreqsY(1,bi,bj) = exchNreqsY(1,bi,bj)+1 |
| 403 |
CALL MPI_Isend(southSendBuf_RS(1,eBl,bi,bj), theSize, theType, |
| 404 |
& theProc, theTag, MPI_COMM_WORLD, |
| 405 |
& exchReqIdY(exchNreqsY(1,bi,bj),1,bi,bj), mpiRc) |
| 406 |
#ifndef ALWAYS_USE_MPI |
| 407 |
ENDIF |
| 408 |
#endif |
| 409 |
#endif /* ALLOW_USE_MPI */ |
| 410 |
northRecvAck(eBl,biS,bjS) = 1. |
| 411 |
ELSEIF ( southCommMode .EQ. COMM_PUT ) THEN |
| 412 |
iB = 0 |
| 413 |
DO K=1,myNz |
| 414 |
DO J=jMin,jMax |
| 415 |
DO I=iMin,iMax |
| 416 |
iB = iB + 1 |
| 417 |
northRecvBuf_RS(iB,eBl,biS,bjS) = array(I,J,K,bi,bj) |
| 418 |
ENDDO |
| 419 |
ENDDO |
| 420 |
ENDDO |
| 421 |
ELSEIF ( southCommMode .NE. COMM_NONE |
| 422 |
& .AND. southCommMode .NE. COMM_GET ) THEN |
| 423 |
STOP ' S/R EXCH: Invalid commS mode.' |
| 424 |
ENDIF |
| 425 |
|
| 426 |
C o Send or Put north edge |
| 427 |
IF ( _theSimulationMode .EQ. FORWARD_SIMULATION ) THEN |
| 428 |
jMin = sNy-exchWidthY+1 |
| 429 |
jMax = sNy |
| 430 |
ELSEIF ( _theSimulationMode .EQ. REVERSE_SIMULATION ) THEN |
| 431 |
jMin = sNy+1 |
| 432 |
jMax = sNy+exchWidthY |
| 433 |
ENDIF |
| 434 |
IF ( northCommMode .EQ. COMM_MSG ) THEN |
| 435 |
iB = 0 |
| 436 |
DO K=1,myNz |
| 437 |
DO J=jMin,jMax |
| 438 |
DO I=iMin,iMax |
| 439 |
iB = iB + 1 |
| 440 |
northSendBuf_RS(iB,eBl,bi,bj) = array(I,J,K,bi,bj) |
| 441 |
ENDDO |
| 442 |
ENDDO |
| 443 |
ENDDO |
| 444 |
C Send the data |
| 445 |
#ifdef ALLOW_USE_MPI |
| 446 |
#ifndef ALWAYS_USE_MPI |
| 447 |
IF ( usingMPI ) THEN |
| 448 |
#endif |
| 449 |
theProc = tilePidN(bi,bj) |
| 450 |
theTag = _tileTagSendN(bi,bj) |
| 451 |
theSize = iB |
| 452 |
theType = MPI_DOUBLE_PRECISION |
| 453 |
#ifdef RS_IS_REAL4 |
| 454 |
theType = MPI_REAL4 |
| 455 |
#endif |
| 456 |
exchNreqsY(1,bi,bj) = exchNreqsY(1,bi,bj)+1 |
| 457 |
CALL MPI_Isend(northSendBuf_RS(1,eBl,bi,bj), theSize, theType, |
| 458 |
& theProc, theTag, MPI_COMM_WORLD, |
| 459 |
& exchReqIdY(exchNreqsY(1,bi,bj),1,bi,bj), mpiRc ) |
| 460 |
#ifndef ALWAYS_USE_MPI |
| 461 |
ENDIF |
| 462 |
#endif |
| 463 |
#endif /* ALLOW_USE_MPI */ |
| 464 |
southRecvAck(eBl,biN,bjN) = 1. |
| 465 |
ELSEIF ( northCommMode .EQ. COMM_PUT ) THEN |
| 466 |
iB = 0 |
| 467 |
DO K=1,myNz |
| 468 |
DO J=jMin,jMax |
| 469 |
DO I=iMin,iMax |
| 470 |
iB = iB + 1 |
| 471 |
southRecvBuf_RS(iB,eBl,biN,bjN) = array(I,J,K,bi,bj) |
| 472 |
ENDDO |
| 473 |
ENDDO |
| 474 |
ENDDO |
| 475 |
ELSEIF ( northCommMode .NE. COMM_NONE |
| 476 |
& .AND. northCommMode .NE. COMM_GET ) THEN |
| 477 |
STOP ' S/R EXCH: Invalid commN mode.' |
| 478 |
ENDIF |
| 479 |
|
| 480 |
ENDDO |
| 481 |
ENDDO |
| 482 |
|
| 483 |
C-- Signal completetion ( making sure system-wide memory state is |
| 484 |
C-- consistent ). |
| 485 |
|
| 486 |
C ** NOTE ** We are relying on being able to produce strong-ordered |
| 487 |
C memory semantics here. In other words we assume that there is a |
| 488 |
C mechanism which can ensure that by the time the Ack is seen the |
| 489 |
C overlap region data that will be exchanged is up to date. |
| 490 |
IF ( exchNeedsMemSync ) CALL MEMSYNC |
| 491 |
|
| 492 |
DO bj=myByLo(myThid),myByHi(myThid) |
| 493 |
DO bi=myBxLo(myThid),myBxHi(myThid) |
| 494 |
ebL = exchangeBufLevel(1,bi,bj) |
| 495 |
biS = _tileBiS(bi,bj) |
| 496 |
bjS = _tileBjS(bi,bj) |
| 497 |
biN = _tileBiN(bi,bj) |
| 498 |
bjN = _tileBjN(bi,bj) |
| 499 |
southCommMode = _tileCommModeS(bi,bj) |
| 500 |
northCommMode = _tileCommModeN(bi,bj) |
| 501 |
IF ( southCommMode .EQ. COMM_PUT ) northRecvAck(eBl,biS,bjS) = 1. |
| 502 |
IF ( northCommMode .EQ. COMM_PUT ) southRecvAck(eBl,biN,bjN) = 1. |
| 503 |
IF ( southCommMode .EQ. COMM_GET ) northRecvAck(eBl,biS,bjS) = 1. |
| 504 |
IF ( northCommMode .EQ. COMM_GET ) southRecvAck(eBl,biN,bjN) = 1. |
| 505 |
ENDDO |
| 506 |
ENDDO |
| 507 |
|
| 508 |
C-- Make sure "ack" setting is seen system-wide. |
| 509 |
C Here strong-ordering is not an issue but we want to make |
| 510 |
C sure that processes that might spin on the above Ack settings |
| 511 |
C will see the setting. |
| 512 |
C ** NOTE ** On some machines we wont spin on the Ack setting |
| 513 |
C ( particularly the T90 ), instead we will use s system barrier. |
| 514 |
C On the T90 the system barrier is very fast and switches out the |
| 515 |
C thread while it waits. On most machines the system barrier |
| 516 |
C is much too slow and if we own the machine and have one thread |
| 517 |
C per process preemption is not a problem. |
| 518 |
IF ( exchNeedsMemSync ) CALL MEMSYNC |
| 519 |
|
| 520 |
RETURN |
| 521 |
END |
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