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C $Header: /u/gcmpack/MITgcm/eesupp/src/global_sum.F,v 1.10 2001/09/21 03:54:35 cnh Exp $ |
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C $Name: $ |
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|
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C-- File global_sum.F: Routines that perform global sum on an array |
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C of thread values. |
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C Contents |
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C o global_sum_r4 |
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C o global_sum_r8 |
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#include "CPP_EEOPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: GLOBAL_SUM_R4 |
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|
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C !INTERFACE: |
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SUBROUTINE GLOBAL_SUM_R4( |
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U sumPhi, |
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I myThid ) |
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IMPLICIT NONE |
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C !DESCRIPTION: |
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C *==========================================================* |
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C | SUBROUTINE GLOBAL_SUM_R4 |
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C | o Handle sum for real*4 data. |
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C *==========================================================* |
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C | Perform sum an array of one value per thread and then |
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C | sum 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 sum, each |
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C | thread is assumed to have already summed its local data. |
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C | The same thread also does the inter-process sum 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 sum 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_SUM.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 sumPhi - Result of sum. |
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C myThid - My thread id. |
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Real*4 sumPhi |
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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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C-- write local sum into array |
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CALL BAR2( myThid ) |
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phiGSRS(1,myThid) = sumPhi |
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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-- Sum within the process first |
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_BEGIN_MASTER( myThid ) |
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tmp = 0. |
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DO I=1,nThreads |
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tmp = tmp + phiGSRS(1,I) |
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ENDDO |
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sumPhi = 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,sumPhi,1,MPI_REAL,MPI_SUM, |
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& MPI_COMM_MODEL,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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phiGSRS(1,1) = sumPhi |
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|
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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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sumPhi = phiGSRS(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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|
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CBOP |
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C !ROUTINE: GLOBAL_SUM_R8 |
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|
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C !INTERFACE: |
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SUBROUTINE GLOBAL_SUM_R8( |
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U sumPhi, |
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I myThid ) |
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IMPLICIT NONE |
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C !DESCRIPTION: |
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C *==========================================================* |
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C | SUBROUTINE GLOBAL_SUM_R8 |
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C | o Handle sum for real*8 data. |
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C *==========================================================* |
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C | Perform sum an array of one value per thread and then |
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C | sum 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 sum, each |
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C | thread is assumed to have already summed its local data. |
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C | The same thread also does the inter-process sum 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 sum 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_SUM.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 sumPhi - Result of sum. |
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C myThid - My thread id. |
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Real*8 sumPhi |
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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 sum into array |
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phiGSRL(1,myThid) = sumPhi |
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|
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C-- Can not start until everyone is ready |
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C CALL FOOL_THE_COMPILER( phiGSRL ) |
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C CALL MS |
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CALL BAR2( myThid ) |
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C _BARRIER |
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C _BARRIER |
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C CALL FOOL_THE_COMPILER( phiGSRL ) |
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|
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C-- Sum within the process first |
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_BEGIN_MASTER( myThid ) |
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tmp = 0. _d 0 |
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DO I=1,nThreads |
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tmp = tmp + phiGSRL(1,I) |
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ENDDO |
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sumPhi = 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,sumPhi,1,MPI_DOUBLE_PRECISION,MPI_SUM, |
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& MPI_COMM_MODEL,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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phiGSRL(1,1) = sumPhi |
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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 sum is done |
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C CALL FOOL_THE_COMPILER( phiGSRL ) |
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C CALL MS |
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C _BARRIER |
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C _BARRIER |
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CALL BAR2( myThid ) |
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C CALL FOOL_THE_COMPILER( phiGSRL ) |
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|
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C-- set result for every process |
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sumPhi = phiGSRL(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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C !ROUTINE: GLOBAL_SUM_INT |
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C !INTERFACE: |
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SUBROUTINE GLOBAL_SUM_INT( |
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U sumPhi, |
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I myThid ) |
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IMPLICIT NONE |
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C !DESCRIPTION: |
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C *==========================================================* |
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C | SUBROUTINE GLOBAL_SUM_INT |
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C | o Handle sum for integer data. |
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C *==========================================================* |
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C | Perform sum an array of one value per thread and then |
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C | sum 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 sum, each |
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C | thread is assumed to have already summed its local data. |
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C | The same thread also does the inter-process sum 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 sum 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_SUM.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 sumPhi - Result of sum. |
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C myThid - My thread id. |
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INTEGER sumPhi |
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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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INTEGER 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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_BARRIER |
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C-- write local sum into array |
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phiGSI(1,myThid) = sumPhi |
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|
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C-- Can not start until everyone is ready |
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_BARRIER |
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|
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C-- Sum within the process first |
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_BEGIN_MASTER( myThid ) |
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tmp = 0. _d 0 |
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DO I=1,nThreads |
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tmp = tmp + phiGSI(1,I) |
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ENDDO |
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sumPhi = 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,sumPhi,1,MPI_INTEGER,MPI_SUM, |
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& MPI_COMM_MODEL,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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phiGSI(1,1) = sumPhi |
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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 sum is done |
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_BARRIER |
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|
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C-- set result for every process |
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sumPhi = phiGSI(1,1) |
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_BARRIER |
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|
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RETURN |
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END |
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