Grid/tests/solver/Test_dwf_qmr_unprec.cc

    /*************************************************************************************

    Grid physics library, www.github.com/paboyle/Grid 

    Source file: ./tests/Test_dwf_cr_unprec.cc

    Copyright (C) 2019

Author: Peter Boyle <pboyle@bnl.gov>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

    See the full license in the file "LICENSE" in the top level distribution directory
    *************************************************************************************/
    /*  END LEGAL */
#include <Grid/Grid.h>
#include <Grid/algorithms/iterative/QuasiMinimalResidual.h>

using namespace std;
using namespace Grid;


int main (int argc, char ** argv)
{
  Grid_init(&argc,&argv);

  const int Ls=8;

  GridCartesian         * UGrid   = SpaceTimeGrid::makeFourDimGrid(GridDefaultLatt(), GridDefaultSimd(Nd,vComplex::Nsimd()),GridDefaultMpi());
  GridRedBlackCartesian * UrbGrid = SpaceTimeGrid::makeFourDimRedBlackGrid(UGrid);
  GridCartesian         * FGrid   = SpaceTimeGrid::makeFiveDimGrid(Ls,UGrid);
  GridRedBlackCartesian * FrbGrid = SpaceTimeGrid::makeFiveDimRedBlackGrid(Ls,UGrid);


  std::vector<int> seeds4({1,2,3,4});
  std::vector<int> seeds5({5,6,7,8});
  GridParallelRNG          RNG5(FGrid);  RNG5.SeedFixedIntegers(seeds5);
  GridParallelRNG          RNG4(UGrid);  RNG4.SeedFixedIntegers(seeds4);

  LatticeFermion    src(FGrid); random(RNG5,src);
  LatticeFermion result(FGrid); result=Zero();
  LatticeGaugeField Umu(UGrid); SU<Nc>::HotConfiguration(RNG4,Umu);

  std::vector<LatticeColourMatrix> U(4,UGrid);

  for(int mu=0;mu<Nd;mu++){
    U[mu] = PeekIndex<LorentzIndex>(Umu,mu);
  }

  RealD tol = 1.0e-8;
  RealD maxit=2000;
  QuasiMinimalResidual<LatticeFermion> QMR(tol,maxit);
  GeneralisedMinimalResidual<LatticeFermion> GMR(tol, maxit, 32,false);
  
  RealD mass=0.0;
  RealD M5=-1.8;
  DomainWallFermionD Ddwf(Umu,*FGrid,*FrbGrid,*UGrid,*UrbGrid,mass,M5);

  Gamma5R5HermitianLinearOperator<DomainWallFermionD,LatticeFermion> g5HermOp(Ddwf);
  QMR(g5HermOp,src,result);
  GMR(g5HermOp,src,result);

  NonHermitianLinearOperator<DomainWallFermionD,LatticeFermion> NonHermOp(Ddwf);
  QMR(NonHermOp,src,result);
  GMR(NonHermOp,src,result);

  MdagMLinearOperator<DomainWallFermionD,LatticeFermion> HermOp(Ddwf);
  ConjugateGradient<LatticeFermion> CG(1.0e-8,10000);
  CG(HermOp,src,result);

  Grid_finalize();
}