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Offload the linear combinations in CG

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This commit is contained in:
Peter Boyle 2019-01-01 13:42:13 +00:00
parent 9efcc535bc
commit ab063f33c0
3 changed files with 15 additions and 9 deletions
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12
Grid/algorithms/LinearOperator.h
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@ -391,12 +391,12 @@ template<class Matrix,class Field> using SchurStagOperator = SchurStaggeredOpera
template<class Field> class OperatorFunction {
public:
virtual void operator() (LinearOperatorBase<Field> &Linop, const Field &in, Field &out) = 0;
virtual void operator() (LinearOperatorBase<Field> &Linop, const std::vector<Field> &in,std::vector<Field> &out) {
assert(in.size()==out.size());
for(int k=0;k<in.size();k++){
(*this)(Linop,in[k],out[k]);
}
};
virtual void operator() (LinearOperatorBase<Field> &Linop, const std::vector<Field> &in,std::vector<Field> &out) {
assert(in.size()==out.size());
for(int k=0;k<in.size();k++){
(*this)(Linop,in[k],out[k]);
}
};
};
template<class Field> class LinearFunction {

2
Grid/algorithms/approx/Chebyshev.h
View File

@ -47,6 +47,8 @@ struct ChebyParams : Serializable {
template<class Field>
class Chebyshev : public OperatorFunction<Field> {
private:
using OperatorFunction<Field>::operator();
std::vector<RealD> Coeffs;
int order;
RealD hi;

10
Grid/algorithms/iterative/ConjugateGradient.h
View File

@ -41,6 +41,9 @@ NAMESPACE_BEGIN(Grid);
template <class Field>
class ConjugateGradient : public OperatorFunction<Field> {
public:
using OperatorFunction<Field>::operator();
bool ErrorOnNoConverge; // throw an assert when the CG fails to converge.
// Defaults true.
RealD Tolerance;
@ -58,7 +61,8 @@ public:
conformable(psi, src);
RealD cp, c, a, d, b, ssq, qq, b_pred;
RealD cp, c, a, d, b, ssq, qq;
//RealD b_pred;
Field p(src);
Field mmp(src);
@ -128,10 +132,10 @@ public:
auto psi_v = psi.View();
auto p_v = p.View();
auto r_v = r.View();
parallel_for(int ss=0;ss<src.Grid()->oSites();ss++){
accelerator_loop(ss,p_v,{
vstream(psi_v[ss], a * p_v[ss] + psi_v[ss]);
vstream(p_v [ss], b * p_v[ss] + r_v[ss]);
}
});
LinearCombTimer.Stop();
LinalgTimer.Stop();