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C $Header: /u/gcmpack/MITgcm/pkg/autodiff/global_max_ad.F,v 1.2 2002/07/13 03:30:30 heimbach Exp $ |
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C $Name: $ |
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|
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C-- File global_max.F: Routines that perform global max reduction on an array |
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C of thread values. |
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C |
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C Adjoint routines are identical to forward routines, |
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C but parameter list is reversed to be consistent with |
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C call statement generated by TAMC/TAF |
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C P. Heimbach, 16-Apr-2002 |
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C |
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C Contents |
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C o global_admax_r4 |
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C o global_admax_r8 |
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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: GLOBAL_ADMAX_R4 |
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|
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C !INTERFACE: |
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#ifdef AUTODIFF_TAMC_COMPATIBILITY |
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SUBROUTINE GLOBAL_ADMAX_R4( |
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I myThid, |
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U maxPhi |
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& ) |
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#else |
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SUBROUTINE GLOBAL_ADMAX_R4( |
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U maxPhi, |
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I myThid |
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& ) |
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#endif |
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IMPLICIT NONE |
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C !DESCRIPTION: |
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C *==========================================================* |
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C | SUBROUTINE GLOBAL_ADMAX_R4 |
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C | o Handle max for real*4 data. |
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C *==========================================================* |
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C | Perform max on array of one value per thread and then |
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C | max result of all the processes. |
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C | Notes |
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C | ===== |
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C | Within a process only one thread does the max, each |
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C | thread is assumed to have already maxed its local data. |
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C | The same thread also does the inter-process max for |
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C | example with MPI and then writes the result into a shared |
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C | location. All threads wait until the max is avaiailable. |
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C *==========================================================* |
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|
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C !USES: |
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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 "GLOBAL_MAX.h" |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments == |
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C maxPhi :: Result of max. |
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C myThid :: My thread id. |
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Real*4 maxPhi |
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INTEGER myThid |
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|
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C !LOCAL VARIABLES: |
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C == Local variables == |
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C I :: Loop counters |
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C mpiRC :: MPI return code |
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INTEGER I |
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Real*4 tmp |
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#ifdef ALLOW_USE_MPI |
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INTEGER mpiRC |
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#endif /* ALLOW_USE_MPI */ |
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CEOP |
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|
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CALL BAR2( myThid ) |
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C-- write local max into array |
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phiGMRS(1,myThid) = maxPhi |
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|
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C-- Can not start until everyone is ready |
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CALL BAR2( myThid ) |
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|
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C-- Max within the process first |
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_BEGIN_MASTER( myThid ) |
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tmp = phiGMRS(1,1) |
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DO I=2,nThreads |
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tmp = MAX(tmp,phiGMRS(1,I)) |
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ENDDO |
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maxPhi = tmp |
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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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CALL MPI_Allreduce(tmp,maxPhi,1,MPI_REAL,MPI_MAX, |
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& MPI_COMM_WORLD,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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phiGMRS(1,1) = maxPhi |
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_END_MASTER( myThid ) |
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C-- |
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CALL BAR2( myThid ) |
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|
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C-- set result for every process |
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maxPhi = phiGMRS(1,1) |
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CALL BAR2( myThid ) |
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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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|
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C !ROUTINE: GLOBAL_ADMAX_R8 |
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|
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C !INTERFACE: |
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#ifdef AUTODIFF_TAMC_COMPATIBILITY |
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SUBROUTINE GLOBAL_ADMAX_R8( |
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I myThid, |
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U maxPhi |
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& ) |
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#else |
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SUBROUTINE GLOBAL_ADMAX_R8( |
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U maxPhi, |
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I myThid |
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& ) |
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#endif |
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IMPLICIT NONE |
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C !DESCRIPTION: |
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C *==========================================================* |
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C | SUBROUTINE GLOBAL_ADMAX_R8 |
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C | o Handle max for real*8 data. |
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C *==========================================================* |
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C | Perform max on array of one value per thread and then |
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C | max result of all the processes. |
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C | Notes |
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C | ===== |
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C | Within a process only one thread does the max, each |
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C | thread is assumed to have already maxed its local data. |
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C | The same thread also does the inter-process max for |
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C | example with MPI and then writes the result into a shared |
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C | location. All threads wait until the max is avaiailable. |
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C *==========================================================* |
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|
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C !USES: |
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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 "GLOBAL_MAX.h" |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C === Routine arguments === |
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C maxPhi :: Result of max. |
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C myThid :: My thread id. |
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Real*8 maxPhi |
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INTEGER myThid |
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|
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C !LOCAL VARIABLES: |
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C === Local variables === |
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C I :: Loop counters |
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C mpiRC :: MPI return code |
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INTEGER I |
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Real*8 tmp |
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#ifdef ALLOW_USE_MPI |
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INTEGER mpiRC |
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#endif /* ALLOW_USE_MPI */ |
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CEOP |
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|
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CALL BAR2( myThid ) |
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C-- write local max into array |
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phiGMRL(1,myThid) = maxPhi |
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|
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C-- Can not start until everyone is ready |
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CALL BAR2( myThid ) |
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|
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C-- Max within the process first |
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_BEGIN_MASTER( myThid ) |
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tmp = phiGMRL(1,1) |
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DO I=2,nThreads |
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tmp = MAX(tmp,phiGMRL(1,I)) |
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ENDDO |
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maxPhi = tmp |
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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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CALL MPI_Allreduce(tmp,maxPhi,1,MPI_DOUBLE_PRECISION,MPI_MAX, |
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& MPI_COMM_WORLD,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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C-- Write solution to place where all threads can see it |
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phiGMRL(1,1) = maxPhi |
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_END_MASTER( myThid ) |
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|
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C-- Do not leave until we are sure that the max is done |
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CALL BAR2( myThid ) |
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|
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C-- set result for every process |
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maxPhi = phiGMRL(1,1) |
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CALL BAR2( myThid ) |
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|
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RETURN |
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END |
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