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C $Header: /u/gcmpack/models/MITgcmUV/eesupp/src/Attic/exch_xyz_rx.template,v 1.1.2.3 2001/04/12 10:52:48 cnh Exp $ |
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C $Name: pre38-close $ |
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#include "CPP_EEOPTIONS.h" |
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|
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SUBROUTINE EXCH_XYZ_RX( |
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U phi, |
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I myThid ) |
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C /==========================================================\ |
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C | SUBROUTINE EXCH_XYZ_RX | |
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C | o Handle exchanges for _RX , three-dimensional arrays. | |
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C |==========================================================| |
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C | Do true shared-memory data transfers and "messaging" | |
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C | tranfers for blocking case of data transfers. | |
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C | Applications call this routine using | |
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C | CALL EXCH..( x, myThid ) | |
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C | where x is a three-dimensional array with overlaps. | |
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C | This routine does true-shared-memory copies for blocks | |
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C | within a thread. It will also do MPI meesaging between | |
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C | different processes. | |
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C | Note: | |
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C | ===== | |
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C | If it is used, "asynchronous" messaging in which | |
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C | communication overlaps computation is handled elsewhere | |
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C | - see recv.F and send.F. | |
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C | In practice MPI implementations may not be completely | |
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C | thread safe. In principle this code is correct even for | |
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C | mixed MPI and multi-threaded execution. | |
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C | In multi-thread execution data managed by other threads | |
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C | is only automatically visible to another thread if it | |
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C | existed before the thread was created. This means that | |
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C | for Fortran we declare arrays with overlap regions in | |
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C | COMMON blocks. | |
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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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|
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C === Routine arguments === |
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C phi - Array with overlap regions are to be exchanged |
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C myThid - My thread id. |
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_RX phi(1-OLx:sNx+OLx,1-OLy:sNy+OLy,1:Nr,nSx,nSy) |
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INTEGER myThid |
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|
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C == Local variables == |
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C OL[wens] - Overlap extents in west, east, north, south. |
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C exchWidth[XY] - Extent of regions that will be exchanged. |
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INTEGER OLw, OLe, OLn, OLs, exchWidthX, exchWidthY, myNz |
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|
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OLw = OLx |
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OLe = OLx |
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OLn = OLy |
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OLs = OLy |
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exchWidthX = OLx |
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exchWidthY = OLy |
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myNz = Nr |
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C ** NOTE ** The exchange routine we use here does not |
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C require the preceeding and following barriers. |
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C However, the slow, simple exchange interface |
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C that is calling it here is meant to ensure |
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C that threads are synchronised before exchanges |
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C begine. |
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IF (useCubedSphereExchange) THEN |
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CALL EXCH_RX_CUBE( phi, |
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I OLw, OLe, OLs, OLn, myNz, |
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I exchWidthX, exchWidthY, |
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I FORWARD_SIMULATION, EXCH_UPDATE_CORNERS, myThid ) |
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ELSE |
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CALL EXCH_RX( phi, |
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I OLw, OLe, OLs, OLn, myNz, |
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I exchWidthX, exchWidthY, |
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I FORWARD_SIMULATION, EXCH_UPDATE_CORNERS, myThid ) |
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ENDIF |
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|
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RETURN |
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END |
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