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https://github.com/paboyle/Grid.git
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127 lines
2.8 KiB
C++
127 lines
2.8 KiB
C++
#include <fenv.h>
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#include <Grid.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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static int
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FEenableexcept (unsigned int excepts)
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{
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#if 0
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static fenv_t fenv;
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unsigned int new_excepts = excepts & FE_ALL_EXCEPT,
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old_excepts; // previous masks
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if ( fegetenv (&fenv) ) return -1;
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old_excepts = fenv.__control & FE_ALL_EXCEPT;
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// unmask
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fenv.__control &= ~new_excepts;
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fenv.__mxcsr &= ~(new_excepts << 7);
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return ( fesetenv (&fenv) ? -1 : old_excepts );
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#else
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return 0;
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#endif
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}
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template<class Field> class DumbOperator : public LinearOperatorBase<Field> {
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public:
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LatticeComplex scale;
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DumbOperator(GridBase *grid) : scale(grid)
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{
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GridParallelRNG pRNG(grid);
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std::vector<int> seeds({5,6,7,8});
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pRNG.SeedFixedIntegers(seeds);
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random(pRNG,scale);
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scale = exp(-real(scale)*3.0);
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std::cout << " True matrix \n"<< scale <<std::endl;
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}
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// Support for coarsening to a multigrid
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void OpDiag (const Field &in, Field &out) {};
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void OpDir (const Field &in, Field &out,int dir,int disp){};
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void Op (const Field &in, Field &out){
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out = scale * in;
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}
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void AdjOp (const Field &in, Field &out){
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out = scale * in;
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}
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void HermOp(const Field &in, Field &out){
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double n1, n2;
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HermOpAndNorm(in,out,n1,n2);
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}
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void HermOpAndNorm(const Field &in, Field &out,double &n1,double &n2){
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ComplexD dot;
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out = scale * in;
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dot= innerProduct(in,out);
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n1=real(dot);
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dot = innerProduct(out,out);
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n2=real(dot);
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}
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};
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int main (int argc, char ** argv)
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{
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// FEenableexcept(FE_ALL_EXCEPT & ~FE_INEXACT);
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Grid_init(&argc,&argv);
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GridCartesian *grid = SpaceTimeGrid::makeFourDimGrid(GridDefaultLatt(),
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GridDefaultSimd(Nd,vComplex::Nsimd()),
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GridDefaultMpi());
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GridParallelRNG RNG(grid);
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std::vector<int> seeds({1,2,3,4});
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RNG.SeedFixedIntegers(seeds);
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RealD alpha = 1.0;
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RealD beta = 0.03;
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RealD mu = 0.0;
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int order = 11;
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ChebyshevLanczos<LatticeComplex> Cheby(alpha,beta,mu,order);
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std::ofstream file("cheby.dat");
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Cheby.csv(file);
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HermOpOperatorFunction<LatticeComplex> X;
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DumbOperator<LatticeComplex> HermOp(grid);
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const int Nk = 40;
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const int Nm = 80;
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const int Nit= 10000;
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int Nconv;
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RealD eresid = 1.0e-8;
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ImplicitlyRestartedLanczos<LatticeComplex> IRL(HermOp,X,Nk,Nm,eresid,Nit);
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ImplicitlyRestartedLanczos<LatticeComplex> ChebyIRL(HermOp,Cheby,Nk,Nm,eresid,Nit);
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LatticeComplex src(grid); gaussian(RNG,src);
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{
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std::vector<RealD> eval(Nm);
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std::vector<LatticeComplex> evec(Nm,grid);
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IRL.calc(eval,evec,src, Nconv);
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}
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{
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// std::vector<RealD> eval(Nm);
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// std::vector<LatticeComplex> evec(Nm,grid);
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// ChebyIRL.calc(eval,evec,src, Nconv);
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}
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Grid_finalize();
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}
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