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C $Header: /u/gcmpack/models/MITgcmUV/eesupp/src/ini_communication_patterns.F,v 1.4 2001/05/29 14:01:36 adcroft Exp $ |
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C $Name: $ |
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#include "CPP_EEOPTIONS.h" |
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|
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CStartOfInterface |
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SUBROUTINE INI_COMMUNICATION_PATTERNS( myThid ) |
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C /==========================================================\ |
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C | SUBROUTINE INI_COMMUNICATION_PATTERNS | |
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C | o Initialise between tile communication data structures. | |
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C |==========================================================| |
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C | This routine assigns identifiers to each tile and then | |
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C | defines a map of neighbors for each tile. | |
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C | For each neighbor a communication method is defined. | |
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C \==========================================================/ |
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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 "EXCH.h" |
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CEndOfInterface |
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|
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C === Routine arguments === |
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C myThid - Thread number we are dealing with in this call |
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INTEGER myThid |
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|
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C === Local variables === |
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C pxW - Process X coord of process to west. |
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C pxE - Process X coord of process to west. |
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C pyN - Process Y coord of process to north. |
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C pyS - Process Y coord of process to south. |
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C procW - Process Id of process to west. |
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C procE - Process Id of process to east. |
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C procN - Process Id of process to north. |
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C procS - Process Id of process to south. |
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C totalTileCount - Total number of tiles |
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C tagW0, tagE0, tagS0, tagN0, theTag - Working variables for |
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C calculating message tags. |
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C biW, biE, bjN, bjS - Tile x and y indices to west, east, |
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C south and north. |
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C bi, bj - Tile loop counter |
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C pi, pj - Process loop counter |
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INTEGER bi0(nPx) |
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INTEGER bj0(nPy) |
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INTEGER bi, bj, pi, pj |
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INTEGER pxW, pxE, pyN, pyS |
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INTEGER procW, procE, procN, procS |
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INTEGER totalTileCount |
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INTEGER tagW0, tagE0, tagS0, tagN0, theTag |
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INTEGER biE, biW, bjN, bjS |
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INTEGER thePx, thePy, theBj, theBi |
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|
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#ifndef ALWAYS_USE_MPI |
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C-- Turn off memsync by default (e.g. needed for threads on SUNs) |
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exchNeedsMemsync = .TRUE. |
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exchUsesBarrier = .TRUE. |
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#else |
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C-- ... except that MPI needs this until some counter problem is fixed. |
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exchNeedsMemsync = .FALSE. |
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exchUsesBarrier = .FALSE. |
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#endif |
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|
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C-- Define a globally unique tile numbers for each tile. |
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C-- We aslo define the tile numbers for our east, west, south |
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C-- and north neighbor tiles here. As coded below this is done from |
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C-- a simple cartesian formula. To handle irregular tile distributions |
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C-- the code below would be changed. For instance we could read |
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C-- the neighbor tile information from a file rather than deriving |
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C-- it in-line. This allows general tile distributions and connectivity |
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C-- both within a thread, between threads and between processors. |
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C Notes -- |
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C 1. The cartesian based formula coded below works as follows: |
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C i. Each tile has one west neighbor, one east neighbor |
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C one north neignbor and one south neighbor. |
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C ii. For each of my neighbors store the following |
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C - neighbor tile id |
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C - neighbor process id |
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C 2. The information that is stored is then used to determine |
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C the between tile communication method. The method used |
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C depends on whether the tile is part of the same process, |
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C on the same machine etc... |
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C 3. To initialise a tile distribution with holes in it |
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C i.e. tiles that are not computed on. Set tile number to |
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C the value NULL_TILE. This must also be done for tileNoW, |
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C tileNoE, tileNoS, tileNoN. |
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C 4. The default formula below assigns tile numbers sequentially |
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C in X on the **global** grid. Within a process the tile numbers |
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C will not necessairily be sequential. This means that the tile |
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C numbering label does not change when nTx, nTy, nPx or nPy change. |
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C It will only change if the tile size changes or the global |
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C grid changes. |
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C bi0 and bj0 are the base global tile grid coordinate for the first |
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C tile in this process. |
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DO pi = 1, nPx |
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bi0(pi) = pi |
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ENDDO |
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DO pj = 1, nPy |
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bj0(pj) = pj |
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ENDDO |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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C o My tile identifier |
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Crg tileNo(bi,bj) = (bj0(myPy)-1+bj-1)*nSx*nPx+bi0(myPx)+bi-1 |
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thePx = myPx |
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thePy = myPy |
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theBj = bj |
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theBi = bi |
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tileNo(bi,bj) = |
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& ((thePy-1)*nSy+theBj-1)*nSx*nPx |
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& + (thePx-1)*nSx |
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& + theBi |
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C o My west neighbor tile and process identifier |
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biW = bi-1 |
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pxW = myPx |
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procW = myPid |
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IF ( biW .LT. 1 ) THEN |
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biW = nSx |
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pxW = myPx-1 |
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procW = pidW |
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IF ( pxW .LT. 1 ) pxW = nPx |
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ENDIF |
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Crg tileNoW (bi,bj) = (bj0(myPy)-1+bj-1)*nSx*nPx+bi0(pxW)+biW-1 |
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thePx = pxW |
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thePy = myPy |
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theBj = bj |
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theBi = biW |
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tileNoW (bi,bj) = |
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& ((thePy-1)*nSy+theBj-1)*nSx*nPx |
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& + (thePx-1)*nSx |
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& + theBi |
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tilePidW(bi,bj) = procW |
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tileBiW (bi,bj) = biW |
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tileBjW (bi,bj) = bj |
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C o My east neighbor tile and process identifier |
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biE = bi+1 |
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pxE = myPx |
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procE = myPid |
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IF ( biE .GT. nSx ) THEN |
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biE = 1 |
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pxE = myPx+1 |
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procE = pidE |
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IF ( pxE .GT. nPx ) pxE = 1 |
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ENDIF |
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Crg tileNoE(bi,bj) = (bj0(myPy)-1+bj-1)*nSx*nPx+bi0(pxE)+biE-1 |
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thePx = pxE |
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thePy = myPy |
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theBi = biE |
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theBj = bj |
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tileNoE(bi,bj) = |
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& ((thePy-1)*nSy+theBj-1)*nSx*nPx |
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& + (thePx-1)*nSx |
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& + theBi |
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tilePidE(bi,bj) = procE |
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tileBiE (bi,bj) = biE |
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tileBjE (bi,bj) = bj |
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C o My north neighbor tile and process identifier |
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bjN = bj+1 |
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pyN = myPy |
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procN = myPid |
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IF ( bjN .GT. nSy ) THEN |
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bjN = 1 |
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pyN = myPy+1 |
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procN = pidN |
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IF ( pyN .GT. nPy ) pyN = 1 |
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ENDIF |
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Crg tileNoN(bi,bj) = (bj0(pyN)-1+bjN-1)*nSx*nPx+bi0(myPx)+bi-1 |
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thePx = myPx |
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thePy = pyN |
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theBi = bi |
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theBj = bjN |
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tileNoN(bi,bj) = |
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& ((thePy-1)*nSy+theBj-1)*nSx*nPx |
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& + (thePx-1)*nSx |
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& + theBi |
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tilePidN(bi,bj) = procN |
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tileBiN(bi,bj) = bi |
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tileBjN(bi,bj) = bjN |
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C o My south neighbor tile and process identifier |
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bjS = bj-1 |
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pyS = myPy |
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procS = myPid |
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IF ( bjS .LT. 1 ) THEN |
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bjS = nSy |
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pyS = pyS-1 |
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procS = pidS |
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IF ( pyS .LT. 1 ) pyS = nPy |
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ENDIF |
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Crg tileNoS(bi,bj) = (bj0(pyS+1)-1+bjS-1)*nSx*nPx+bi0(myPx+1)+bi-1 |
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thePx = myPx |
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thePy = pyS |
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theBi = bi |
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theBj = bjS |
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tileNoS(bi,bj) = |
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& ((thePy-1)*nSy+theBj-1)*nSx*nPx |
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& + (thePx-1)*nSx |
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& + theBi |
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tilePidS(bi,bj) = procS |
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tileBiS(bi,bj) = bi |
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tileBjS(bi,bj) = bjS |
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ENDDO |
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ENDDO |
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|
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C-- Define the total count of tiles. |
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totalTileCount = nSx*nSy*nPx*nPy |
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|
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C-- Set tags for each tile face. |
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C Tags are used to distinguish exchanges from particular |
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C faces of particular tiles. |
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C Tag numbers are based on |
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C i - The tile number |
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C ii - The direction (N,S,W,E) of the message |
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C We dont check for the NULL_TILE tile number here as it |
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C should not actually be used. |
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TagW0=1 |
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TagE0=2 |
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TagN0=3 |
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TagS0=4 |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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C Send tags |
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C o Tag I use for messages I send to west |
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theTag = TagW0*totalTileCount+tileNo(bi,bj)-1 |
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tileTagSendW(bi,bj) = theTag |
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C o Tag I use for messages I send to east |
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theTag = TagE0*totalTileCount+tileNo(bi,bj)-1 |
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tileTagSendE(bi,bj) = theTag |
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C o Tag I use for messages I send to north |
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theTag = TagN0*totalTileCount+tileNo(bi,bj)-1 |
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tileTagSendN(bi,bj) = theTag |
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C o Tag I use for messages I send to south |
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theTag = TagS0*totalTileCount+tileNo(bi,bj)-1 |
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tileTagSendS(bi,bj) = theTag |
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C Receive tags |
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C o Tag on messages I receive from my east |
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theTag = TagW0*totalTileCount+tileNoE(bi,bj)-1 |
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tileTagRecvE(bi,bj) = theTag |
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C o Tag on messages I receive from my west |
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theTag = TagE0*totalTileCount+tileNoW(bi,bj)-1 |
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tileTagRecvW(bi,bj) = theTag |
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C o Tag on messages I receive from my north |
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theTag = TagS0*totalTileCount+tileNoN(bi,bj)-1 |
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tileTagRecvN(bi,bj) = theTag |
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C o Tag on messages I receive from my north |
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theTag = TagN0*totalTileCount+tileNoS(bi,bj)-1 |
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tileTagRecvS(bi,bj) = theTag |
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ENDDO |
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ENDDO |
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|
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C-- Set the form of excahnge to use between neighboring |
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C -- tiles. |
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C For now use either shared memory, messages or nothing. Further |
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C rules can be added later to allow shm regions and ump regions |
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C etc... |
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C Notes - |
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C 1. We require symmetry here. If one face of a tile uses |
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C communication method A then the matching face on its neighbor |
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C tile must also use communication method A. |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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C o West face communication |
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IF ( tileNoW(bi,bj) .EQ. NULL_TILE ) THEN |
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tileCommModeW(bi,bj) = COMM_NONE |
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ELSE |
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IF ( myPid .EQ. tilePidW(bi,bj) ) THEN |
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tileCommModeW(bi,bj) = COMM_PUT |
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ELSE |
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tileCommModeW(bi,bj) = COMM_MSG |
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ENDIF |
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ENDIF |
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C o East face communication |
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IF ( tileNoE(bi,bj) .EQ. NULL_TILE ) THEN |
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tileCommModeE(bi,bj) = COMM_NONE |
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ELSE |
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IF ( myPid .EQ. tilePidE(bi,bj) ) THEN |
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tileCommModeE(bi,bj) = COMM_PUT |
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ELSE |
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tileCommModeE(bi,bj) = COMM_MSG |
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ENDIF |
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ENDIF |
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C o South face communication |
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IF ( tileNoS(bi,bj) .EQ. NULL_TILE ) THEN |
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tileCommModeS(bi,bj) = COMM_NONE |
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ELSE |
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IF ( myPid .EQ. tilePidS(bi,bj) ) THEN |
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tileCommModeS(bi,bj) = COMM_PUT |
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ELSE |
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tileCommModeS(bi,bj) = COMM_MSG |
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ENDIF |
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ENDIF |
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C o North face communication |
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IF ( tileNoN(bi,bj) .EQ. NULL_TILE ) THEN |
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tileCommModeN(bi,bj) = COMM_NONE |
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ELSE |
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IF ( myPid .EQ. tilePidN(bi,bj) ) THEN |
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tileCommModeN(bi,bj) = COMM_PUT |
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ELSE |
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tileCommModeN(bi,bj) = COMM_MSG |
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ENDIF |
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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 Initialise outstanding exchange request counter |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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exchNReqsX(1,bi,bj) = 0 |
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exchNReqsY(1,bi,bj) = 0 |
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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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