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https://github.com/paboyle/Grid.git
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195 lines
7.7 KiB
C++
195 lines
7.7 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./tests/solver/Test_wilsonclover_mg_mp.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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/* */
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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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using namespace Grid::QCD;
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int main(int argc, char **argv) {
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Grid_init(&argc, &argv);
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// clang-format off
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GridCartesian *FGrid_d = SpaceTimeGrid::makeFourDimGrid(GridDefaultLatt(), GridDefaultSimd(Nd, vComplexD::Nsimd()), GridDefaultMpi());
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GridCartesian *FGrid_f = SpaceTimeGrid::makeFourDimGrid(GridDefaultLatt(), GridDefaultSimd(Nd, vComplexF::Nsimd()), GridDefaultMpi());
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GridRedBlackCartesian *FrbGrid_d = SpaceTimeGrid::makeFourDimRedBlackGrid(FGrid_d);
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GridRedBlackCartesian *FrbGrid_f = SpaceTimeGrid::makeFourDimRedBlackGrid(FGrid_f);
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// clang-format on
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std::vector<int> fSeeds({1, 2, 3, 4});
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GridParallelRNG fPRNG(FGrid_d);
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fPRNG.SeedFixedIntegers(fSeeds);
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// clang-format off
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LatticeFermionD src_d(FGrid_d); gaussian(fPRNG, src_d);
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LatticeFermionD resultMGD_d(FGrid_d); resultMGD_d = zero;
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LatticeFermionD resultMGF_d(FGrid_d); resultMGF_d = zero;
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LatticeGaugeFieldD Umu_d(FGrid_d);
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#if 0
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{
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FieldMetaData header;
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std::string file("./qcdsf.769.00399.lime");
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std::cout <<GridLogMessage<<"**************************************"<<std::endl;
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std::cout <<GridLogMessage<<"** Reading back ILDG conf *********"<<std::endl;
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std::cout <<GridLogMessage<<"**************************************"<<std::endl;
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IldgReader _IldgReader;
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_IldgReader.open(file);
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_IldgReader.readConfiguration(Umu_d,header);
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_IldgReader.close();
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}
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#else
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{
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FieldMetaData header;
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std::string file("./ckpoint_lat.IEEE64BIG.1100");
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NerscIO::readConfiguration(Umu_d,header,file);
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}
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#endif
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// SU3::HotConfiguration(fPRNG, Umu_d);
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LatticeGaugeFieldF Umu_f(FGrid_f); precisionChange(Umu_f, Umu_d);
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// clang-format on
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RealD mass = -0.25;
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RealD csw_r = 1.0;
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RealD csw_t = 1.0;
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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_d(FGrid_d, mgParams);
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LevelInfo levelInfo_f(FGrid_f, 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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WilsonCloverFermionD Dwc_d(Umu_d, *FGrid_d, *FrbGrid_d, mass, csw_r, csw_t);
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WilsonCloverFermionF Dwc_f(Umu_f, *FGrid_f, *FrbGrid_f, mass, csw_r, csw_t);
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MdagMLinearOperator<WilsonCloverFermionD, LatticeFermionD> MdagMOpDwc_d(Dwc_d);
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MdagMLinearOperator<WilsonCloverFermionF, LatticeFermionF> MdagMOpDwc_f(Dwc_f);
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std::cout << GridLogMessage << "**************************************************" << std::endl;
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std::cout << GridLogMessage << "Testing single-precision Multigrid for Wilson Clover" << std::endl;
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std::cout << GridLogMessage << "**************************************************" << std::endl;
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auto MGPreconDwc_f = createMGInstance<vSpinColourVectorF, vTComplexF, nbasis, WilsonCloverFermionF>(mgParams, levelInfo_f, Dwc_f, Dwc_f);
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MGPreconDwc_f->setup();
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if(GridCmdOptionExists(argv, argv + argc, "--runchecks")) {
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MGPreconDwc_f->runChecks(1e-6);
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}
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MixedPrecisionFlexibleGeneralisedMinimalResidual<LatticeFermionD, LatticeFermionF> MPFGMRESPREC(
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1.0e-12, 50000, FGrid_f, *MGPreconDwc_f, 100, false);
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std::cout << std::endl << "Starting with a new solver" << std::endl;
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MPFGMRESPREC(MdagMOpDwc_d, src_d, resultMGF_d);
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MGPreconDwc_f->reportTimings();
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if(GridCmdOptionExists(argv, argv + argc, "--docomparison")) {
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std::cout << GridLogMessage << "**************************************************" << std::endl;
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std::cout << GridLogMessage << "Testing double-precision Multigrid for Wilson Clover" << std::endl;
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std::cout << GridLogMessage << "**************************************************" << std::endl;
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auto MGPreconDwc_d = createMGInstance<vSpinColourVectorD, vTComplexD, nbasis, WilsonCloverFermionD>(mgParams, levelInfo_d, Dwc_d, Dwc_d);
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MGPreconDwc_d->setup();
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if(GridCmdOptionExists(argv, argv + argc, "--runchecks")) {
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MGPreconDwc_d->runChecks(1e-13);
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}
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FlexibleGeneralisedMinimalResidual<LatticeFermionD> FGMRESPREC(1.0e-12, 50000, *MGPreconDwc_d, 100, false);
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std::cout << std::endl << "Starting with a new solver" << std::endl;
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FGMRESPREC(MdagMOpDwc_d, src_d, resultMGD_d);
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MGPreconDwc_d->reportTimings();
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std::cout << GridLogMessage << "**************************************************" << std::endl;
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std::cout << GridLogMessage << "Comparing single-precision Multigrid with double-precision one for Wilson Clover" << std::endl;
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std::cout << GridLogMessage << "**************************************************" << std::endl;
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LatticeFermionD diffFullSolver(FGrid_d);
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RealD deviationFullSolver = axpy_norm(diffFullSolver, -1.0, resultMGF_d, resultMGD_d);
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// clang-format off
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LatticeFermionF src_f(FGrid_f); precisionChange(src_f, src_d);
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LatticeFermionF resMGF_f(FGrid_f); resMGF_f = zero;
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LatticeFermionD resMGD_d(FGrid_d); resMGD_d = zero;
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// clang-format on
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(*MGPreconDwc_f)(src_f, resMGF_f);
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(*MGPreconDwc_d)(src_d, resMGD_d);
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LatticeFermionD diffOnlyMG(FGrid_d);
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LatticeFermionD resMGF_d(FGrid_d);
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precisionChange(resMGF_d, resMGF_f);
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RealD deviationOnlyPrec = axpy_norm(diffOnlyMG, -1.0, resMGF_d, resMGD_d);
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// clang-format off
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std::cout << GridLogMessage << "Absolute difference between FGMRES preconditioned by double and single precicision MG: " << deviationFullSolver << std::endl;
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std::cout << GridLogMessage << "Relative deviation between FGMRES preconditioned by double and single precicision MG: " << deviationFullSolver / norm2(resultMGD_d) << std::endl;
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std::cout << GridLogMessage << "Absolute difference between one iteration of MG Prec in double and single precision: " << deviationOnlyPrec << std::endl;
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std::cout << GridLogMessage << "Relative deviation between one iteration of MG Prec in double and single precision: " << deviationOnlyPrec / norm2(resMGD_d) << std::endl;
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// clang-format on
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}
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Grid_finalize();
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}
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