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Updated FFT test for PETSc

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This commit is contained in:
Peter Boyle
2022-12-18 12:05:00 -05:00
parent 281f8101fe
commit d8c29f5fcf
3 changed files with 129 additions and 22 deletions
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95
tests/core/Test_fft_matt.cc
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@ -1,5 +1,4 @@
/*************************************************************************************
grid` physics library, www.github.com/paboyle/Grid
Source file: ./tests/Test_cshift.cc
@ -29,7 +28,14 @@ Author: Peter Boyle <paboyle@ph.ed.ac.uk>
#include <Grid/Grid.h>
using namespace Grid;
;
Gamma::Algebra Gmu [] = {
Gamma::Algebra::GammaX,
Gamma::Algebra::GammaY,
Gamma::Algebra::GammaZ,
Gamma::Algebra::GammaT,
Gamma::Algebra::Gamma5
};
int main (int argc, char ** argv)
{
@ -49,22 +55,7 @@ int main (int argc, char ** argv)
GridCartesian GRID(latt_size,simd_layout,mpi_layout);
GridRedBlackCartesian RBGRID(&GRID);
LatticeComplexD one(&GRID);
LatticeComplexD zz(&GRID);
LatticeComplexD C(&GRID);
LatticeComplexD Ctilde(&GRID);
LatticeComplexD Cref (&GRID);
LatticeComplexD Csav (&GRID);
LatticeComplexD coor(&GRID);
LatticeSpinMatrixD S(&GRID);
LatticeSpinMatrixD Stilde(&GRID);
Coordinate p({1,3,2,3});
one = ComplexD(1.0,0.0);
zz = ComplexD(0.0,0.0);
ComplexD ci(0.0,1.0);
std::vector<int> seeds({1,2,3,4});
@ -73,7 +64,6 @@ int main (int argc, char ** argv)
pRNG.SeedFixedIntegers(seeds);
LatticeGaugeFieldD Umu(&GRID);
SU<Nc>::ColdConfiguration(pRNG,Umu); // Unit gauge
////////////////////////////////////////////////////
@ -81,17 +71,78 @@ int main (int argc, char ** argv)
////////////////////////////////////////////////////
{
LatticeFermionD src(&GRID); gaussian(pRNG,src);
LatticeFermionD src_p(&GRID);
LatticeFermionD tmp(&GRID);
LatticeFermionD ref(&GRID);
LatticeFermionD result(&GRID);
RealD mass=0.01;
RealD mass=0.1;
WilsonFermionD Dw(Umu,GRID,RBGRID,mass);
Dw.M(src,tmp);
Dw.M(src,ref);
std::cout << "Norm src "<<norm2(src)<<std::endl;
std::cout << "Norm Dw x src "<<norm2(ref)<<std::endl;
{
FFT theFFT(&GRID);
////////////////
// operator in Fourier space
////////////////
tmp =ref;
theFFT.FFT_all_dim(result,tmp,FFT::forward);
std::cout<<"FFT[ Dw x src ] "<< norm2(result)<<std::endl;
tmp = src;
theFFT.FFT_all_dim(src_p,tmp,FFT::forward);
std::cout<<"FFT[ src ] "<< norm2(src_p)<<std::endl;
/////////////////////////////////////////////////////////////////
// work out the predicted FT from Fourier
/////////////////////////////////////////////////////////////////
auto FGrid = &GRID;
LatticeFermionD Kinetic(FGrid); Kinetic = Zero();
LatticeComplexD kmu(FGrid);
LatticeInteger scoor(FGrid);
LatticeComplexD sk (FGrid); sk = Zero();
LatticeComplexD sk2(FGrid); sk2= Zero();
LatticeComplexD W(FGrid); W= Zero();
LatticeComplexD one(FGrid); one =ComplexD(1.0,0.0);
ComplexD ci(0.0,1.0);
for(int mu=0;mu<Nd;mu++) {
RealD TwoPiL = M_PI * 2.0/ latt_size[mu];
LatticeCoordinate(kmu,mu);
kmu = TwoPiL * kmu;
sk2 = sk2 + 2.0*sin(kmu*0.5)*sin(kmu*0.5);
sk = sk + sin(kmu) *sin(kmu);
// -1/2 Dw -> 1/2 gmu (eip - emip) = i sinp gmu
Kinetic = Kinetic + sin(kmu)*ci*(Gamma(Gmu[mu])*src_p);
}
W = mass + sk2;
Kinetic = Kinetic + W * src_p;
std::cout<<"Momentum space src "<< norm2(src_p)<<std::endl;
std::cout<<"Momentum space Dw x src "<< norm2(Kinetic)<<std::endl;
std::cout<<"FT[Coordinate space Dw] "<< norm2(result)<<std::endl;
result = result - Kinetic;
std::cout<<"diff "<< norm2(result)<<std::endl;
}
std::cout << " =======================================" <<std::endl;
std::cout << " Checking FourierFreePropagator x Dw = 1" <<std::endl;
std::cout << " =======================================" <<std::endl;
std::cout << "Dw src = " <<norm2(src)<<std::endl;
std::cout << "Dw tmp = " <<norm2(tmp)<<std::endl;
Dw.M(src,tmp);
Dw.FreePropagator(tmp,ref,mass);
std::cout << "Dw ref = " <<norm2(ref)<<std::endl;
@ -122,7 +173,7 @@ int main (int argc, char ** argv)
ferm()(0)(0) = ComplexD(1.0);
pokeSite(ferm,src,point);
RealD mass=0.01;
RealD mass=0.1;
WilsonFermionD Dw(Umu,GRID,RBGRID,mass);
// Momentum space prop