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ConjugateGradientMixedPrec now stores final true residual and uses the precisionChange workspaces for improved efficiency

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This commit is contained in:
Christopher Kelly 2021-01-06 09:50:41 -05:00
parent 80c14be65e
commit 287bac946f
1 changed files with 9 additions and 2 deletions
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11
Grid/algorithms/iterative/ConjugateGradientMixedPrec.h
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@ -48,6 +48,7 @@ NAMESPACE_BEGIN(Grid);
Integer TotalInnerIterations; //Number of inner CG iterations
Integer TotalOuterIterations; //Number of restarts
Integer TotalFinalStepIterations; //Number of CG iterations in final patch-up step
RealD TrueResidual;
//Option to speed up *inner single precision* solves using a LinearFunction that produces a guess
LinearFunction<FieldF> *guesser;
@ -79,6 +80,11 @@ NAMESPACE_BEGIN(Grid);
RealD stop = src_norm * Tolerance*Tolerance;
GridBase* DoublePrecGrid = src_d_in.Grid();
//Generate precision change workspaces
precisionChangeWorkspace wk_dp_from_sp(DoublePrecGrid, SinglePrecGrid);
precisionChangeWorkspace wk_sp_from_dp(SinglePrecGrid, DoublePrecGrid);
FieldD tmp_d(DoublePrecGrid);
tmp_d.Checkerboard() = cb;
@ -119,7 +125,7 @@ NAMESPACE_BEGIN(Grid);
while(norm * inner_tol * inner_tol < stop) inner_tol *= 2; // inner_tol = sqrt(stop/norm) ??
PrecChangeTimer.Start();
precisionChange(src_f, src_d);
precisionChange(src_f, src_d, wk_sp_from_dp);
PrecChangeTimer.Stop();
sol_f = Zero();
@ -137,7 +143,7 @@ NAMESPACE_BEGIN(Grid);
//Convert sol back to double and add to double prec solution
PrecChangeTimer.Start();
precisionChange(tmp_d, sol_f);
precisionChange(tmp_d, sol_f, wk_dp_from_sp);
PrecChangeTimer.Stop();
axpy(sol_d, 1.0, tmp_d, sol_d);
@ -149,6 +155,7 @@ NAMESPACE_BEGIN(Grid);
ConjugateGradient<FieldD> CG_d(Tolerance, MaxInnerIterations);
CG_d(Linop_d, src_d_in, sol_d);
TotalFinalStepIterations = CG_d.IterationsToComplete;
TrueResidual = CG_d.TrueResidual;
TotalTimer.Stop();
std::cout<<GridLogMessage<<"MixedPrecisionConjugateGradient: Inner CG iterations " << TotalInnerIterations << " Restarts " << TotalOuterIterations << " Final CG iterations " << TotalFinalStepIterations << std::endl;