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global_max.F
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global_max.F
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#include "CPP_EEOPTIONS.h"
C-- File global_max.F: Routines that perform global max reduction on an array
C of thread values.
C Contents
C o GLOBAL_MAX_R4
C o GLOBAL_MAX_R8
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
CBOP
C !ROUTINE: GLOBAL_MAX_R4
C !INTERFACE:
SUBROUTINE GLOBAL_MAX_R4(
U maxPhi,
I myThid )
C !DESCRIPTION:
C *==========================================================*
C | SUBROUTINE GLOBAL\_MAX\_R4
C | o Handle max for real*4 data.
C *==========================================================*
C | Perform max on array of one value per thread and then
C | max result of all the processes.
C | Notes
C | =====
C | Within a process only one thread does the max, each
C | thread is assumed to have already maxed its local data.
C | The same thread also does the inter-process max for
C | example with MPI and then writes the result into a shared
C | location. All threads wait until the max is avaiailable.
C *==========================================================*
C !USES:
IMPLICIT NONE
C == Global data ==
#include "SIZE.h"
#include "EEPARAMS.h"
#include "EESUPPORT.h"
#include "GLOBAL_MAX.h"
C !INPUT/OUTPUT PARAMETERS:
C == Routine arguments ==
C maxPhi :: Result of max.
C myThid :: My thread id.
Real*4 maxPhi
INTEGER myThid
C !LOCAL VARIABLES:
C == Local variables ==
C I :: Loop counters
C mpiRC :: MPI return code
INTEGER I
Real*4 tmp
#ifdef ALLOW_USE_MPI
INTEGER mpiRC
#endif /* ALLOW_USE_MPI */
CEOP
C-- write local max into array
phiGMR4(1,myThid) = maxPhi
C-- Can not start until everyone is ready
CALL BAR2( myThid )
C-- Max within the process first
_BEGIN_MASTER( myThid )
tmp = phiGMR4(1,1)
DO I=2,nThreads
tmp = MAX(tmp,phiGMR4(1,I))
ENDDO
maxPhi = tmp
#ifdef ALLOW_USE_MPI
IF ( usingMPI ) THEN
CALL MPI_Allreduce(tmp,maxPhi,1,MPI_REAL,MPI_MAX,
& MPI_COMM_MODEL,mpiRC)
ENDIF
#endif /* ALLOW_USE_MPI */
phiGMR4(1,0) = maxPhi
_END_MASTER( myThid )
C-- Do not leave until we are sure that the max is done
CALL BAR2( myThid )
C-- set result for every process
maxPhi = phiGMR4(1,0)
RETURN
END
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
CBOP
C !ROUTINE: GLOBAL_MAX_R8
C !INTERFACE:
SUBROUTINE GLOBAL_MAX_R8(
O maxPhi,
I myThid )
C !DESCRIPTION:
C *==========================================================*
C | SUBROUTINE GLOBAL\_MAX\_R8
C | o Handle max for real*8 data.
C *==========================================================*
C | Perform max on array of one value per thread and then
C | max result of all the processes.
C | Notes
C | =====
C | Within a process only one thread does the max, each
C | thread is assumed to have already maxed its local data.
C | The same thread also does the inter-process max for
C | example with MPI and then writes the result into a shared
C | location. All threads wait until the max is avaiailable.
C *==========================================================*
C !USES:
IMPLICIT NONE
C === Global data ===
#include "SIZE.h"
#include "EEPARAMS.h"
#include "EESUPPORT.h"
#include "GLOBAL_MAX.h"
C !INPUT/OUTPUT PARAMETERS:
C === Routine arguments ===
C maxPhi :: Result of max.
C myThid :: My thread id.
Real*8 maxPhi
INTEGER myThid
C !LOCAL VARIABLES:
C === Local variables ===
C I :: Loop counters
C mpiRC :: MPI return code
INTEGER I
Real*8 tmp
#ifdef ALLOW_USE_MPI
INTEGER mpiRC
#endif /* ALLOW_USE_MPI */
CEOP
C-- write local max into array
phiGMR8(1,myThid) = maxPhi
C-- Can not start until everyone is ready
CALL BAR2( myThid )
C-- Max within the process first
_BEGIN_MASTER( myThid )
tmp = phiGMR8(1,1)
DO I=2,nThreads
tmp = MAX(tmp,phiGMR8(1,I))
ENDDO
maxPhi = tmp
#ifdef ALLOW_USE_MPI
IF ( usingMPI ) THEN
CALL MPI_Allreduce(tmp,maxPhi,1,MPI_DOUBLE_PRECISION,MPI_MAX,
& MPI_COMM_MODEL,mpiRC)
ENDIF
#endif /* ALLOW_USE_MPI */
C-- Write solution to place where all threads can see it
phiGMR8(1,0) = maxPhi
_END_MASTER( myThid )
C-- Do not leave until we are sure that the max is done
CALL BAR2( myThid )
C-- set result for every process
maxPhi = phiGMR8(1,0)
RETURN
END