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Coarse grid on GPU, not fast enough yet. Need a 10x

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This commit is contained in:
Peter Boyle 2019-12-17 05:24:45 -05:00
parent e478404291
commit 9cfd64c604
1 changed files with 61 additions and 28 deletions
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89
Grid/algorithms/CoarsenedMatrix.h
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@ -117,8 +117,8 @@ public:
CoarseScalar InnerProd(CoarseGrid);
std::cout << GridLogMessage <<" Block Gramm-Schmidt pass 1"<<std::endl;
blockOrthogonalise(InnerProd,subspace);
std::cout << GridLogMessage <<" Block Gramm-Schmidt pass 2"<<std::endl; // Really have to do twice? Yuck
blockOrthogonalise(InnerProd,subspace);
// std::cout << GridLogMessage <<" Block Gramm-Schmidt pass 2"<<std::endl; // Really have to do twice? Yuck
// blockOrthogonalise(InnerProd,subspace);
// std::cout << GridLogMessage <<" Gramm-Schmidt checking orthogonality"<<std::endl;
// CheckOrthogonal();
}
@ -137,11 +137,15 @@ public:
std::cout<<GridLogMessage <<"CheckOrthog done"<<std::endl;
}
void ProjectToSubspace(CoarseVector &CoarseVec,const FineField &FineVec){
// std::cout << GridLogMessage<< "BlockPromote"<<std::endl;
blockProject(CoarseVec,FineVec,subspace);
// std::cout << GridLogMessage<< "BlockPromote"<<std::endl;
}
void PromoteFromSubspace(const CoarseVector &CoarseVec,FineField &FineVec){
FineVec.Checkerboard() = subspace[0].Checkerboard();
// std::cout << GridLogMessage<< "BlockPromote"<<std::endl;
blockPromote(CoarseVec,FineVec,subspace);
// std::cout << GridLogMessage<< "BlockPromote done"<<std::endl;
}
void CreateSubspaceRandom(GridParallelRNG &RNG){
for(int i=0;i<nbasis;i++){
@ -262,12 +266,10 @@ public:
gaussian(RNG,noise);
scale = std::pow(norm2(noise),-0.5);
noise=noise*scale;
// save=noise;
// Initial matrix element
hermop.Op(noise,Mn); std::cout<<GridLogMessage << "noise ["<<bb<<"] <n|MdagM|n> "<<norm2(Mn)<<std::endl;
int dep=0;
for(int b=bb;b<MIN(bb+dependent,nn);b++) {
// Filter
@ -283,16 +285,13 @@ public:
// set this new vector
subspace[b] = Mn;
// new matrix element
hermop.Op(Mn,noise); std::cout<<GridLogMessage << "filtered["<<b<<"] <f|MdagM|f> "<<norm2(noise)<<std::endl;
// Dependent vector rule
// a) noise = A. Mn;
noise = Mn; // Already normaliseed
// c) noise = fourier_phase * Mn; // etc..
dep++;
// Dependent vector rule
noise = Mn; // Already normaliseed
}
}
@ -310,7 +309,7 @@ public:
typedef iVector<CComplex,nbasis > siteVector;
typedef Lattice<siteVector> CoarseVector;
typedef Lattice<iMatrix<CComplex,nbasis > > CoarseMatrix;
typedef iMatrix<CComplex,nbasis > Cobj;
typedef Lattice< CComplex > CoarseScalar; // used for inner products on fine field
typedef Lattice<Fobj > FineField;
@ -336,36 +335,70 @@ public:
conformable(_grid,in.Grid());
conformable(in.Grid(),out.Grid());
RealD Nin = norm2(in);
// RealD Nin = norm2(in);
SimpleCompressor<siteVector> compressor;
double comms_usec = -usecond();
Stencil.HaloExchange(in,compressor);
comms_usec += usecond();
auto in_v = in.View();
auto out_v = out.View();
accelerator_for(ss,Grid()->oSites(),1,{
siteVector res = Zero();
siteVector nbr;
typedef LatticeView<Cobj> Aview;
Vector<Aview> AcceleratorViewContainer;
for(int p=0;p<geom.npoint;p++) AcceleratorViewContainer.push_back(A[p].View());
Aview *Aview_p = & AcceleratorViewContainer[0];
const int Nsimd = CComplex::Nsimd();
typedef decltype(coalescedRead(in_v[0])) calcVector;
GridStopWatch ArithmeticTimer;
int osites=Grid()->oSites();
double flops = osites*Nsimd*nbasis*nbasis*8.0*geom.npoint;
double bytes = osites*nbasis*nbasis*geom.npoint*sizeof(CComplex);
double usecs =-usecond();
assert(geom.npoint==9);
accelerator_for(ss, Grid()->oSites(), Nsimd, {
calcVector res = Zero();
calcVector nbr;
int ptype;
StencilEntry *SE;
for(int point=0;point<geom.npoint;point++){
int lane=SIMTlane(Nsimd);
for(int point=0;point<9;point++){
SE=Stencil.GetEntry(ptype,point,ss);
if(SE->_is_local&&SE->_permute) {
permute(nbr,in_v[SE->_offset],ptype);
} else if(SE->_is_local) {
nbr = in_v[SE->_offset];
if(SE->_is_local) {
nbr = coalescedReadPermute(in_v[SE->_offset],ptype,SE->_permute,lane);
} else {
nbr = Stencil.CommBuf()[SE->_offset];
nbr = coalescedRead(Stencil.CommBuf()[SE->_offset],lane);
}
auto A_point = A[point].View();
res = res + A_point[ss]*nbr;
}
vstream(out_v[ss],res);
});
synchronise();
auto A = coalescedRead(Aview_p[point][ss]);
res = res + A*nbr;
}
coalescedWrite(out_v[ss],res,lane);
});
usecs +=usecond();
double nrm_usec=-usecond();
RealD Nout= norm2(out);
nrm_usec+=usecond();
/*
std::cout << GridLogMessage << "\tNorm " << nrm_usec << " us" <<std::endl;
std::cout << GridLogMessage << "\tHalo " << comms_usec << " us" <<std::endl;
std::cout << GridLogMessage << "\tMatrix " << usecs << " us" <<std::endl;
std::cout << GridLogMessage << "\t mflop/s " << flops/usecs<<std::endl;
std::cout << GridLogMessage << "\t MB/s " << bytes/usecs<<std::endl;
*/
return Nout;
};
@ -459,7 +492,7 @@ public:
std::cout << GridLogMessage<< "CoarsenMatrix" << std::endl;
// Orthogonalise the subblocks over the basis
blockOrthogonalise(InnerProd,Subspace.subspace);
// blockOrthogonalise(InnerProd,Subspace.subspace);
std::cout << GridLogMessage<< "CoarsenMatrix orthogonalised" << std::endl;
// Compute the matrix elements of linop between this orthonormal