Grid/tests/hmc/Test_hmc_IwasakiGauge.cc

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

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

    Source file: ./tests/Test_hmc_IwasakiGauge.cc

    Copyright (C) 2015

Author: Azusa Yamaguchi <ayamaguc@staffmail.ed.ac.uk>

    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>


int main(int argc, char **argv) {
  using namespace Grid;
  using namespace Grid::QCD;

  Grid_init(&argc, &argv);
  int threads = GridThread::GetThreads();
  // here make a routine to print all the relevant information on the run
  std::cout << GridLogMessage << "Grid is setup to use " << threads << " threads" << std::endl;

   // Typedefs to simplify notation
  typedef GenericHMCRunner<MinimumNorm2> HMCWrapper;  // Uses the default minimum norm
  HMCWrapper TheHMC;

  // Grid from the command line
  TheHMC.Resources.AddFourDimGrid("gauge");
  // Possibile to create the module by hand 
  // hardcoding parameters or using a Reader


  // Checkpointer definition
  CheckpointerParameters CPparams;  
  CPparams.config_prefix = "ckpoint_lat";
  CPparams.rng_prefix = "ckpoint_rng";
  CPparams.saveInterval = 20;
  CPparams.format = "IEEE64BIG";
  
  TheHMC.Resources.LoadBinaryCheckpointer(CPparams);

  RNGModuleParameters RNGpar;
  RNGpar.SerialSeed = {1,2,3,4,5};
  RNGpar.ParallelSeed = {6,7,8,9,10};
  TheHMC.Resources.SetRNGSeeds(RNGpar);

  // Construct observables
  // here there is too much indirection 
  PlaquetteObsParameters PlPar;
  PlPar.output_prefix = "Plaquette";
  PlaquetteMod<HMCWrapper::ImplPolicy> PlaqModule(PlPar);
  TheHMC.Resources.AddObservable(&PlaqModule);
  //////////////////////////////////////////////

  /////////////////////////////////////////////////////////////
  // Collect actions, here use more encapsulation
  // need wrappers of the fermionic classes 
  // that have a complex construction
  // standard
  RealD beta = 2.6 ;
  IwasakiGaugeActionR Iaction(beta);
  
  ActionLevel<HMCWrapper::Field> Level1(1);
  Level1.push_back(&Iaction);
  //Level1.push_back(WGMod.getPtr());
  TheHMC.TheAction.push_back(Level1);
  /////////////////////////////////////////////////////////////

  // HMC parameters are serialisable 
  TheHMC.Parameters.MD.MDsteps = 20;
  TheHMC.Parameters.MD.trajL   = 1.0;

  TheHMC.ReadCommandLine(argc, argv); // these can be parameters from file
  TheHMC.Run();  // no smearing

  Grid_finalize();

} // main