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Adding parity flip and gamma 5 option for Block KS starting vector

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This commit is contained in:
Chulwoo Jung
2026-06-16 16:05:06 -04:00
parent e862dd662b
commit d2189d59e0
5 changed files with 126 additions and 15 deletions
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examples/Example_krylov_schur.cc
+12 -4
View File
@@ -334,12 +334,13 @@ int main (int argc, char ** argv)
// Run KrylovSchur and Arnoldi on a Hermitian matrix
RealD shift=LanParams.shift;
#if 1
#if 0
std::cout << GridLogMessage << "Running Krylov Schur" << std::endl;
KrylovSchur KrySchur (Dwilson, UGrid, resid,EvalImNormSmall);
// KrySchur(src[0], maxIter, Nm, Nk, Nstop);
KrySchur.doEvalCheck=true;
KrySchur(src[0], maxIter, Nm, Nk, Nstop,&shift);
// KrySchur(src[0], maxIter, Nm, Nk, Nstop,&shift);
KrySchur(src[0], maxIter, Nm, Nk, Nstop);
std::cout << GridLogMessage << "KrylovSchur evec.size= " << KrySchur.evecs.size()<< std::endl;
#else
std::cout << GridLogMessage << "Running BlockKrylovSchur" << std::endl;
@@ -347,9 +348,16 @@ int main (int argc, char ** argv)
Nblock=LanParams.Nblock;
bool if_verify=false;
if(LanParams.verify) if_verify=true;
BlockKrylovSchur KrySchur (Dwilson, UGrid, resid,EvalImNormSmall);
// HarmonicBlockKrylovSchur KrySchur (Dwilson, UGrid, resid,shift,EvalNormSmall);
// BlockKrylovSchur KrySchur (Dwilson, UGrid, resid,EvalImNormSmall);
HarmonicBlockKrylovSchur KrySchur (Dwilson, UGrid, resid,shift,EvalNormSmall);
KrySchur.doEvalCheck=true;
KrySchur.useParityFlip=true; std::cout << GridLogMessage << "useParityFlip= " <<KrySchur.useParityFlip<< std::endl;
KrySchur.useGamma5=true; std::cout << GridLogMessage << "useGamma5= " <<KrySchur.useGamma5<< std::endl;
KrySchur.gamma5Func = [](const FermionField& v, FermionField& out) {
Gamma g5(Gamma::Algebra::Gamma5);
out = g5 * v;
};
KrySchur(src, maxIter, Nm, Nk, Nstop,Nblock,true,if_verify);
std::cout << GridLogMessage << "BlockKrylovSchur evec.size= " << KrySchur.evecs.size()<< std::endl;
#endif
examples/LanParams.xml
+3 -3
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@@ -5,14 +5,14 @@
<mstep>-0.025</mstep>
<M5>1.8</M5>
<Ls>48</Ls>
<Nstop>800</Nstop>
<Nk>800</Nk>
<Nstop>100</Nstop>
<Nk>100</Nk>
<Np>100</Np>
<ReadEvec>0</ReadEvec>
<maxIter>1000</maxIter>
<reorthog>1</reorthog>
<Nblock>4</Nblock>
<verify>1</verify>
<verify>0</verify>
<shift>1.5</shift>
<resid>1e-8</resid>
<ChebyLow>1</ChebyLow>