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MultiShift for Staggered

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Azusa Yamaguchi 2018-05-02 14:22:37 +01:00
parent 441ad7498d
commit b35169f1dd
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tests/solver/Test_staggered_multishift.cc Normal file
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/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./tests/Test_wilson_cg_unprec.cc
Copyright (C) 2015
Author: Azusa Yamaguchi <ayamaguc@staffmail.ed.ac.uk>
Author: Peter Boyle <paboyle@ph.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>
#include <Grid/algorithms/iterative/BlockConjugateGradient.h>
using namespace std;
using namespace Grid;
using namespace Grid::QCD;
template<class d>
struct scal {
d internal;
};
Gamma::Algebra Gmu [] = {
Gamma::Algebra::GammaX,
Gamma::Algebra::GammaY,
Gamma::Algebra::GammaZ,
Gamma::Algebra::GammaT
};
int main (int argc, char ** argv)
{
typedef typename ImprovedStaggeredFermionR::FermionField FermionField;
typename ImprovedStaggeredFermionR::ImplParams params;
Grid_init(&argc,&argv);
std::vector<int> latt_size = GridDefaultLatt();
std::vector<int> simd_layout = GridDefaultSimd(Nd,vComplex::Nsimd());
std::vector<int> mpi_layout = GridDefaultMpi();
GridCartesian Grid(latt_size,simd_layout,mpi_layout);
GridRedBlackCartesian RBGrid(&Grid);
std::vector<int> seeds({1,2,3,4});
GridParallelRNG pRNG(&Grid); pRNG.SeedFixedIntegers(seeds);
LatticeGaugeField Umu(&Grid); SU3::HotConfiguration(pRNG,Umu);
double volume=1;
for(int mu=0;mu<Nd;mu++){
volume=volume*latt_size[mu];
}
////////////////////////////////////////
// sqrt
////////////////////////////////////////
double lo=0.001;
double hi=1.0;
int precision=64;
int degree=10;
AlgRemez remez(lo,hi,precision);
remez.generateApprox(degree,1,2);
MultiShiftFunction Sqrt(remez,1.0e-6,false);
std::cout<<GridLogMessage << "Generating degree "<<degree<<" for x^(1/2)"<<std::endl;
////////////////////////////////////////////
// Setup staggered
////////////////////////////////////////////
RealD mass=0.003;
RealD c1=9.0/8.0;
RealD c2=-1.0/24.0;
RealD u0=1.0;
ImprovedStaggeredFermionR Ds(Umu,Umu,Grid,RBGrid,mass,c1,c2,u0);
SchurStaggeredOperator<ImprovedStaggeredFermionR,FermionField> HermOpEO(Ds);
FermionField src(&Grid); random(pRNG,src);
FermionField src_o(&RBGrid);
pickCheckerboard(Odd,src_o,src);
/////////////////////////////////
//Multishift CG
/////////////////////////////////
std::vector<FermionField> result(degree,&RBGrid);
ConjugateGradientMultiShift<FermionField> MSCG(10000,Sqrt);
double deodoe_flops=(1205+15*degree)*volume; // == 66*16 + == 1146
double t1=usecond();
MSCG(HermOpEO,src_o,result);
double t2=usecond();
double ncall=MSCG.IterationsToComplete;
double flops = deodoe_flops * ncall;
std::cout<<GridLogMessage << "usec = "<< (t2-t1)<<std::endl;
std::cout<<GridLogMessage << "flops = "<< flops<<std::endl;
std::cout<<GridLogMessage << "mflop/s = "<< flops/(t2-t1)<<std::endl;
// HermOpEO.Report();
Grid_finalize();
}