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Got unpreconditioned conjugate gradient to run and converge on a random (uniform random,

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not even SU(3) for now) gauge field. Convergence history is correctly indepdendent of decomposition
on 1,2,4,8,16 mpi tasks.
Found a couple of simd bugs which required fixed and enhanced the Grid_simd.cc test suite.
Implemented the Mdag, M, MdagM, Meooe Mooee schur type stuff in the wilson dop.
This commit is contained in:
Peter Boyle
2015-05-19 13:57:35 +01:00
parent c7314e526e
commit ffc00caea3
33 changed files with 566 additions and 316 deletions
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16
lib/algorithms/iterative/ConjugateGradient.h
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@ -18,6 +18,7 @@ public:
std::cout << Tolerance<<std::endl;
};
void operator() (LinearOperatorBase<Field> &Linop,const Field &src, Field &psi) {assert(0);};
void operator() (HermitianOperatorBase<Field> &Linop,const Field &src, Field &psi){
RealD cp,c,a,d,b,ssq,qq,b_pred;
@ -61,21 +62,27 @@ public:
Linop.OpAndNorm(p,mmp,d,qq);
// std::cout <<std::setprecision(4)<< "ConjugateGradient: d,qq "<<d<< " "<<qq <<std::endl;
a = c/d;
b_pred = a*(a*qq-d)/c;
cp = axpy_norm(r,mmp,r,-a);
// std::cout <<std::setprecision(4)<< "ConjugateGradient: a,bp "<<a<< " "<<b_pred <<std::endl;
cp = axpy_norm(r,-a,mmp,r);
b = cp/c;
// std::cout <<std::setprecision(4)<< "ConjugateGradient: cp,b "<<cp<< " "<<b <<std::endl;
// Fuse these loops ; should be really easy
psi= a*p+psi;
p = p*b+r;
std::cout << "Iteration " <<k<<" residual "<<cp<< " target"<< rsq<<std::endl;
std::cout<<"ConjugateGradient: Iteration " <<k<<" residual "<<cp<< " target"<< rsq<<std::endl;
// Stopping condition
if ( cp <= rsq ) {
Linop.Op(p,mmp);
Linop.Op(psi,mmp);
p=mmp-src;
RealD mmpnorm = sqrt(norm2(mmp));
@ -83,8 +90,11 @@ public:
RealD srcnorm = sqrt(norm2(src));
RealD resnorm = sqrt(norm2(p));
RealD true_residual = resnorm/srcnorm;
std::cout<<"ConjugateGradient: Converged on iteration " <<k<<" residual "<<cp<< " target"<< rsq<<std::endl;
std::cout<<"ConjugateGradient: true residual is "<<true_residual<<" sol "<<psinorm<<" src "<<srcnorm<<std::endl;
std::cout<<"ConjugateGradient: target residual was "<<Tolerance<<std::endl;
return;
}
}
std::cout<<"ConjugateGradient did NOT converge"<<std::endl;