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114 lines
4.1 KiB
C++
114 lines
4.1 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./tests/solver/Test_wilson_mg.cc
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Copyright (C) 2015-2018
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Author: Daniel Richtmann <daniel.richtmann@ur.de>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution directory
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*************************************************************************************/
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/* END LEGAL */
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#include <Grid/Grid.h>
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#include <Test_multigrid_common.h>
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using namespace std;
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using namespace Grid;
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int main(int argc, char **argv) {
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Grid_init(&argc, &argv);
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GridCartesian * FGrid = SpaceTimeGrid::makeFourDimGrid(GridDefaultLatt(), GridDefaultSimd(Nd, vComplex::Nsimd()), GridDefaultMpi());
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GridRedBlackCartesian *FrbGrid = SpaceTimeGrid::makeFourDimRedBlackGrid(FGrid);
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std::vector<int> fSeeds({1, 2, 3, 4});
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GridParallelRNG fPRNG(FGrid);
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fPRNG.SeedFixedIntegers(fSeeds);
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// clang-format off
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LatticeFermion src(FGrid); gaussian(fPRNG, src);
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LatticeFermion result(FGrid); result = Zero();
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LatticeGaugeField Umu(FGrid); SU<Nc>::HotConfiguration(fPRNG, Umu);
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// clang-format on
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RealD mass = -0.25;
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MultiGridParams mgParams;
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std::string inputXml{"./mg_params.xml"};
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if(GridCmdOptionExists(argv, argv + argc, "--inputxml")) {
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inputXml = GridCmdOptionPayload(argv, argv + argc, "--inputxml");
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assert(inputXml.length() != 0);
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}
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{
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XmlWriter writer("mg_params_template.xml");
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write(writer, "Params", mgParams);
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std::cout << GridLogMessage << "Written mg_params_template.xml" << std::endl;
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XmlReader reader(inputXml);
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read(reader, "Params", mgParams);
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std::cout << GridLogMessage << "Read in " << inputXml << std::endl;
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}
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checkParameterValidity(mgParams);
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std::cout << mgParams << std::endl;
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LevelInfo levelInfo(FGrid, mgParams);
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// Note: We do chiral doubling, so actually only nbasis/2 full basis vectors are used
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const int nbasis = 40;
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WilsonFermionR Dw(Umu, *FGrid, *FrbGrid, mass);
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MdagMLinearOperator<WilsonFermionR, LatticeFermion> MdagMOpDw(Dw);
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std::cout << GridLogMessage << "**************************************************" << std::endl;
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std::cout << GridLogMessage << "Testing Multigrid for Wilson" << std::endl;
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std::cout << GridLogMessage << "**************************************************" << std::endl;
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TrivialPrecon<LatticeFermion> TrivialPrecon;
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auto MGPreconDw = createMGInstance<vSpinColourVector, vTComplex, nbasis, WilsonFermionR>(mgParams, levelInfo, Dw, Dw);
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MGPreconDw->setup();
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if(GridCmdOptionExists(argv, argv + argc, "--runchecks")) {
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RealD toleranceForMGChecks = (getPrecision<LatticeFermion>::value == 1) ? 1e-6 : 1e-13;
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MGPreconDw->runChecks(toleranceForMGChecks);
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}
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std::vector<std::unique_ptr<OperatorFunction<LatticeFermion>>> solversDw;
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solversDw.emplace_back(new ConjugateGradient<LatticeFermion>(1.0e-12, 50000, false));
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solversDw.emplace_back(new FlexibleGeneralisedMinimalResidual<LatticeFermion>(1.0e-12, 50000, TrivialPrecon, 100, false));
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solversDw.emplace_back(new FlexibleGeneralisedMinimalResidual<LatticeFermion>(1.0e-12, 50000, *MGPreconDw, 100, false));
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for(auto const &solver : solversDw) {
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std::cout << std::endl << "Starting with a new solver" << std::endl;
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result = zero;
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(*solver)(MdagMOpDw, src, result);
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}
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MGPreconDw->reportTimings();
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Grid_finalize();
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}
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