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C $Header: /u/gcmpack/MITgcm/eesupp/src/gsum.F,v 1.7 2004/03/27 03:51:51 edhill Exp $ |
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C $Name: $ |
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#include "CPP_EEOPTIONS.h" |
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|
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CBOP |
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|
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C !ROUTINE: GSUM_R8_INIT |
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|
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C !INTERFACE: |
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SUBROUTINE GSUM_R8_INIT( myThid ) |
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IMPLICIT NONE |
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|
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C !DESCRIPTION: |
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C *==========================================================* |
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C | SUBROUTINE GSUM\_R8\_INIT |
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C | o Setup data structures for global sum. |
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C *==========================================================* |
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C | Fast true shared memory form for global sum operation. |
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C *==========================================================* |
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|
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C !USES: |
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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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C GSR8_value :: Global data for accumulating sum elements. |
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C GSR8_level :: Cyclic buffer index into global data sum elements. |
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COMMON /GS_R8_BUFFER_R/ |
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& GSR8_value |
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Real*8 GSR8_value(lShare8,MAX_NO_THREADS) |
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#define _NOT_SET_ 1.23456D12 |
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COMMON /GS_R8_BUFFER_I/ |
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& GSR8_level |
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INTEGER GSR8_level |
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|
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C !INPUT PARAMETERS: |
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C myThid :: Thread number of this instance. |
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INTEGER myThid |
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|
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C !LOCAL VARIABLES: |
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C I :: Loop counter. |
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INTEGER I |
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CEOP |
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GSR8_level = 1 |
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DO I = 1, lShare8 |
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GSR8_value(I,myThid) = _NOT_SET_ |
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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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CBOP |
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C !ROUTINE: GSUM_R8 |
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|
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C !INTERFACE: |
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SUBROUTINE GSUM_R8( myPhi, answer, myThid ) |
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IMPLICIT NONE |
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C !DESCRIPTION: |
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C *==========================================================* |
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C | SUBROUTINE GSUM\_R8 |
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C | o Perform global sum. |
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C *==========================================================* |
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C | Fast true shared memory form for global sum operation. |
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C *==========================================================* |
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C !USES: |
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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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C GSR8_value :: Global data for accumulating sum elements. |
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C GSR8_level :: Cyclic buffer index into global data sum elements. |
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COMMON /GS_R8_BUFFER_R/ |
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& GSR8_value |
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Real*8 GSR8_value(lShare8,MAX_NO_THREADS) |
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#define _NOT_SET_ 1.23456D12 |
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COMMON /GS_R8_BUFFER_I/ |
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& GSR8_level |
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INTEGER GSR8_level |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C myPhi :: This threads contribution |
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C answer :: Result of sum over all threads |
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C myThid :: This threads id number |
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Real*8 myPhi |
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Real*8 answer |
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INTEGER myThid |
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#ifdef ALLOW_USE_MPI |
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Real*8 tmp, sumPhi |
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INTEGER mpiRc |
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#endif |
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C |
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C !LOCAL VARIABLES: |
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C nDone :: Counter for number of threads completed. |
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C I :: Loop counter. |
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C curLev :: Cyclic global sum buffer levels. |
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C prevLev |
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INTEGER nDone |
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INTEGER I |
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INTEGER curLev, prevLev |
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CEOP |
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|
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C answer = 1. |
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C CALL BAR2(myThid) |
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C CALL BAR2(myThid) |
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C CALL BAR2(myThid) |
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C RETURN |
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C |
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IF ( myThid .NE. 1 ) THEN |
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|
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curLev = GSR8_level |
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GSR8_value(curLev,myThid) = myPhi |
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10 CONTINUE |
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IF ( GSR8_value(curLev,1) .NE. _NOT_SET_ ) GOTO 11 |
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CALL FOOL_THE_COMPILER_R8( GSR8_value(1,1) ) |
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GOTO 10 |
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11 CONTINUE |
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GSR8_value(curLev,myThid) = _NOT_SET_ |
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answer = GSR8_value(curLev,1) |
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|
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ELSE |
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|
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curLev = GSR8_level |
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prevLev = curLev+1 |
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IF ( prevLev .GT. 2 ) prevLev = 1 |
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|
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12 CONTINUE |
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CALL FOOL_THE_COMPILER_R8( GSR8_value(1,1) ) |
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nDone = 1 |
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DO I = 2, nThreads |
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IF ( GSR8_value(curLev,I) .NE. _NOT_SET_ ) nDone = nDone+1 |
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ENDDO |
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IF ( nDone .LT. nThreads ) GOTO 12 |
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|
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GSR8_level = prevLev |
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CALL FOOL_THE_COMPILER_R8( GSR8_value(1,1) ) |
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GSR8_value(prevLev,1) = _NOT_SET_ |
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|
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answer = myPhi |
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DO I = 2,nThreads |
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answer = answer+GSR8_value(curLev,I) |
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ENDDO |
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|
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#ifdef ALLOW_USE_MPI |
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#ifndef ALWAYS_USE_MPI |
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IF ( usingMPI ) THEN |
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#endif |
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tmp = answer |
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CALL MPI_Allreduce(tmp,sumPhi,1,MPI_DOUBLE_PRECISION,MPI_SUM, |
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& MPI_COMM_MODEL,mpiRC) |
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answer = sumPhi |
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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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|
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GSR8_value(curLev,1) = answer |
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|
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ENDIF |
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|
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RETURN |
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END |
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