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C $Id$ |
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SUBROUTINE CG2D |
SUBROUTINE CG2D |
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C /==========================================================\ |
C /==========================================================\ |
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C | SUBROUTINE CG2D | |
C | SUBROUTINE CG2D | |
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#include "EEPARAMS.h" |
#include "EEPARAMS.h" |
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#include "PARAMS.h" |
#include "PARAMS.h" |
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#include "CG2D.h" |
#include "CG2D.h" |
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#if defined(USE_PAPI_FLOPS) || defined(USE_PAPI_FLIPS) |
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#if defined(PAPI_PER_ITERATION) || defined(PAPI_PER_TIMESTEP) |
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#include "PAPI.h" |
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#endif |
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#endif |
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C === Routine arguments === |
C === Routine arguments === |
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C myThid - Thread on which I am working. |
C myThid - Thread on which I am working. |
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C err - Measure of residual of Ax - b, usually the norm. |
C err - Measure of residual of Ax - b, usually the norm. |
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C I, J, N - Loop counters ( N counts CG iterations ) |
C I, J, N - Loop counters ( N counts CG iterations ) |
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INTEGER actualIts |
INTEGER actualIts |
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REAL actualResidual |
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INTEGER bi, bj |
INTEGER bi, bj |
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INTEGER I, J, N |
INTEGER I, J, N |
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REAL err |
#ifdef USE_MIXED_PRECISION |
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REAL errSum |
REAL*8 actualResidual |
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REAL etaN |
REAL*8 err |
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REAL etaNM1 |
REAL*8 errSum |
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REAL etaNSum |
REAL*8 etaN |
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REAL beta |
REAL*8 etaNM1 |
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REAL alpha |
REAL*8 etaNSum |
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REAL alphaSum |
REAL*8 beta |
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REAL sumRHS |
REAL*8 alpha |
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REAL temp |
REAL*8 alphaSum |
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REAL*8 sumRHS |
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REAL*8 temp |
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#else |
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Real actualResidual |
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Real err |
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Real errSum |
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Real etaN |
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Real etaNM1 |
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Real etaNSum |
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Real beta |
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Real alpha |
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Real alphaSum |
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Real sumRHS |
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Real temp |
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#endif |
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C-- Initialise inverter |
C-- Initialise inverter |
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etaNM1 = 1. D0 |
etaNM1 = 1. _d 0 |
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C-- Initial residual calculation |
C-- Initial residual calculation |
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err = 0. _d 0 |
err = 0. _d 0 |
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sumRHS = 0. _d 0 |
sumRHS = 0. _d 0 |
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DO J=1,sNy |
DO J=1,sNy |
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DO I=1,sNx |
DO I=1,sNx |
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cg2d_s(I,J) = 0. |
cg2d_s(I,J) = 0. _d 0 |
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cg2d_r(I,J) = cg2d_b(I,J) - |
cg2d_r(I,J) = cg2d_b(I,J) - |
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& ( aW2d(I ,J )*cg2d_x(I-1,J )+aW2d(I+1,J )*cg2d_x(I+1,J ) |
& ( aW2d(I ,J )*cg2d_x(I-1,J )+aW2d(I+1,J )*cg2d_x(I+1,J ) |
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& +aS2d(I ,J )*cg2d_x(I ,J-1)+aS2d(I ,J+1)*cg2d_x(I ,J+1) |
& +aS2d(I ,J )*cg2d_x(I ,J-1)+aS2d(I ,J+1)*cg2d_x(I ,J+1) |
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actualIts = 0 |
actualIts = 0 |
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actualResidual = SQRT(err) |
actualResidual = SQRT(err) |
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WRITE(6,*) ' CG2D iters, err = ', actualIts, actualResidual |
WRITE(6,*) ' CG2D iters, err = ', actualIts, actualResidual |
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IF ( actualResidual .EQ. 0. ) STOP 'ABNORMAL END: RESIDUAL 0' |
IF ( actualResidual .EQ. 0. _d 0) STOP 'ABNORMAL END: RESIDUAL 0' |
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C >>>>>>>>>>>>>>> BEGIN SOLVER <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
C >>>>>>>>>>>>>>> BEGIN SOLVER <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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DO 10 N=1, cg2dMaxIters |
DO 10 N=1, cg2dMaxIters |
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err = SQRT(err) |
err = SQRT(err) |
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actualIts = N |
actualIts = N |
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actualResidual = err |
actualResidual = err |
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CcnhDebugStarts |
#ifdef RESIDUAL_PER_ITERATION |
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C WRITE(6,*) ' CG2D iters, err = ', actualIts, actualResidual |
WRITE(6,*) ' CG2D iters, err = ', actualIts, actualResidual |
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CcnhDebugEnds |
#endif |
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IF ( err .LT. cg2dTargetResidual ) GOTO 11 |
IF ( err .LT. cg2dTargetResidual ) GOTO 11 |
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CALL EXCH_XY_R8(cg2d_r ) |
CALL EXCH_XY_R8(cg2d_r ) |
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#ifdef PAPI_PER_ITERATION |
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#ifdef USE_PAPI_FLOPS |
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call PAPIF_flops(real_time, proc_time, flpops, mflops, check) |
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WRITE(6,'(F10.3,A7,F10.3,A37,I8)') |
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$ mflops, ' user ', mflops*proc_time/real_time, |
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$ ' wallclock Mflop/s during iteration ', N |
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#else |
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#ifdef USE_PAPI_FLIPS |
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call PAPIF_flips(real_time, proc_time, flpops, mflops, check) |
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WRITE(6,'(F10.3,A7,F10.3,A37,I8)') |
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$ mflops, ' user ', mflops*proc_time/real_time, |
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$ ' wallclock Mflip/s during iteration ', N |
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#endif |
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#endif |
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#endif |
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10 CONTINUE |
10 CONTINUE |
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11 CONTINUE |
11 CONTINUE |
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CALL EXCH_XY_R8(cg2d_x ) |
CALL EXCH_XY_R8(cg2d_x ) |
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#ifdef PAPI_PER_TIMESTEP |
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#ifdef USE_PAPI_FLOPS |
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call PAPIF_flops(real_time, proc_time, flpops, mflops, check) |
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WRITE(6,'(F10.3,A7,F10.3,A37,I8)') |
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$ mflops, ' user ', mflops*proc_time/real_time, |
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$ ' wallclock Mflop/s during iteration ', N |
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#else |
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#ifdef USE_PAPI_FLIPS |
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call PAPIF_flips(real_time, proc_time, flpops, mflops, check) |
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WRITE(6,'(F10.3,A7,F10.3,A37,I8)') |
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$ mflops, ' user ', mflops*proc_time/real_time, |
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$ ' wallclock Mflip/s during iteration ', N |
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#endif |
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#endif |
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#endif |
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WRITE(6,*) ' CG2D iters, err = ', actualIts, actualResidual |
WRITE(6,*) ' CG2D iters, err = ', actualIts, actualResidual |
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C Calc Ax to check result |
C Calc Ax to check result |