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Reduction finished and hopefully fixes CI regression fail on single precisoin and force
This commit is contained in:
Peter Boyle
parent
96ac56cace
commit
3e49dc8a67
@ -29,55 +29,58 @@ Author: paboyle <paboyle@ph.ed.ac.uk>
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#endif
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NAMESPACE_BEGIN(Grid);
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template<class vobj>
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inline typename vobj::scalar_object sum_cpu(const Lattice<vobj> &arg)
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{
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GridBase *grid=arg.Grid();
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int Nsimd = grid->Nsimd();
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Vector<vobj> sumarray(grid->SumArraySize());
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for(int i=0;i<grid->SumArraySize();i++){
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//////////////////////////////////////////////////////
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// FIXME this should promote to double and accumulate
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//////////////////////////////////////////////////////
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template<class vobj>
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inline typename vobj::scalar_object sum_cpu(const vobj *arg, Integer osites)
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{
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typedef typename vobj::scalar_object sobj;
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const int Nsimd = vobj::Nsimd();
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const int nthread = GridThread::GetThreads();
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Vector<sobj> sumarray(nthread);
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for(int i=0;i<nthread;i++){
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sumarray[i]=Zero();
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}
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auto arg_v=arg.View();
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thread_for(thr,grid->SumArraySize(), {
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thread_for(thr,nthread, {
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int nwork, mywork, myoff;
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nwork = grid->oSites();
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nwork = osites;
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GridThread::GetWork(nwork,thr,mywork,myoff);
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vobj vvsum=Zero();
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for(int ss=myoff;ss<mywork+myoff; ss++){
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vvsum = vvsum + arg_v[ss];
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vvsum = vvsum + arg[ss];
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}
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sumarray[thr]=vvsum;
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sumarray[thr]=Reduce(vvsum);
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});
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vobj vsum=Zero(); // sum across threads
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for(int i=0;i<grid->SumArraySize();i++){
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vsum = vsum+sumarray[i];
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sobj ssum=Zero(); // sum across threads
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for(int i=0;i<nthread;i++){
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ssum = ssum+sumarray[i];
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}
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typedef typename vobj::scalar_object sobj;
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sobj ssum=Zero();
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ExtractBuffer<sobj> buf(Nsimd);
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extract(vsum,buf);
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for(int i=0;i<Nsimd;i++) ssum = ssum + buf[i];
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arg.Grid()->GlobalSum(ssum);
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return ssum;
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}
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template<class vobj>
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inline typename vobj::scalar_object sum(const vobj *arg, Integer osites)
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{
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#ifdef GRID_NVCC
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return sum_gpu(arg,osites);
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#else
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return sum_cpu(arg,osites);
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#endif
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}
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template<class vobj>
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inline typename vobj::scalar_object sum(const Lattice<vobj> &arg)
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{
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#ifdef GRID_NVCC
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return sum_gpu(arg);
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#else
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return sum_cpu(arg);
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#endif
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auto arg_v = arg.View();
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Integer osites = arg.Grid()->oSites();
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auto ssum= sum(&arg_v[0],osites);
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arg.Grid()->GlobalSum(ssum);
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return ssum;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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@ -94,7 +97,7 @@ inline ComplexD innerProduct(const Lattice<vobj> &left,const Lattice<vobj> &righ
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{
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typedef typename vobj::scalar_type scalar_type;
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typedef typename vobj::vector_typeD vector_type;
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scalar_type nrm;
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ComplexD nrm;
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GridBase *grid = left.Grid();
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@ -105,9 +108,17 @@ inline ComplexD innerProduct(const Lattice<vobj> &left,const Lattice<vobj> &righ
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const uint64_t nsimd = grid->Nsimd();
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const uint64_t sites = grid->oSites();
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typename vobj::scalar_object f;
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typename vobj::scalar_objectD d;
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f=Zero();
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d=f;
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#ifdef GRID_NVCC
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// GPU - SIMT lane compliance...
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typedef decltype(innerProduct(left_v[0],right_v[0])) inner_t;
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Lattice<inner_t> inner_tmp(grid);
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auto inner_tmp_v = inner_tmp.View();
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Vector<inner_t> inner_tmp(sites);
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auto inner_tmp_v = &inner_tmp[0];
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accelerator_for( ss, sites, nsimd,{
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auto x_l = left_v(ss);
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@ -115,9 +126,24 @@ inline ComplexD innerProduct(const Lattice<vobj> &left,const Lattice<vobj> &righ
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coalescedWrite(inner_tmp_v[ss],innerProduct(x_l,y_l));
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})
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nrm = TensorRemove(sum(inner_tmp));
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// This is in single precision and fails some tests
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// Need a sumD that sums in double
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nrm = TensorRemove(sumD_gpu(inner_tmp_v,sites));
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#else
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// CPU
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typedef decltype(innerProductD(left_v[0],right_v[0])) inner_t;
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Vector<inner_t> inner_tmp(sites);
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auto inner_tmp_v = &inner_tmp[0];
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accelerator_for( ss, sites, nsimd,{
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auto x_l = left_v[ss];
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auto y_l = right_v[ss];
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inner_tmp_v[ss]=innerProductD(x_l,y_l);
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})
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nrm = TensorRemove(sum(inner_tmp_v,sites));
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#endif
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grid->GlobalSum(nrm);
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// right.Grid()->GlobalSum(nrm);
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return nrm;
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}
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@ -153,19 +179,34 @@ axpby_norm_fast(Lattice<vobj> &z,sobj a,sobj b,const Lattice<vobj> &x,const Latt
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const uint64_t nsimd = grid->Nsimd();
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const uint64_t sites = grid->oSites();
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#ifdef GRID_NVCC
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// GPU
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typedef decltype(innerProduct(x_v[0],y_v[0])) inner_t;
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Lattice<inner_t> inner_tmp(grid);
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auto inner_tmp_v = inner_tmp.View();
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Vector<inner_t> inner_tmp(sites);
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auto inner_tmp_v = &inner_tmp[0];
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accelerator_for( ss, sites, nsimd,{
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auto tmp = a*x_v(ss)+b*y_v(ss);
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coalescedWrite(inner_tmp_v[ss],innerProduct(tmp,tmp));
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coalescedWrite(z_v[ss],tmp);
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})
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});
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nrm = real(TensorRemove(sum(inner_tmp)));
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nrm = real(TensorRemove(sumD_gpu(inner_tmp_v,sites)));
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#else
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// CPU
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typedef decltype(innerProductD(x_v[0],y_v[0])) inner_t;
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Vector<inner_t> inner_tmp(sites);
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auto inner_tmp_v = &inner_tmp[0];
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// z.Grid()->GlobalSum(nrm);
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accelerator_for( ss, sites, nsimd,{
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auto tmp = a*x_v(ss)+b*y_v(ss);
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inner_tmp_v[ss]=innerProductD(tmp,tmp);
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z_v[ss]=tmp;
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});
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// Already promoted to double
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nrm = real(TensorRemove(sum(inner_tmp_v,sites)));
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#endif
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grid->GlobalSum(nrm);
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return nrm;
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}
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@ -82,13 +82,11 @@ __device__ void reduceBlock(volatile sobj *sdata, sobj mySum, const Iterator tid
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__syncthreads();
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}
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template <class vobj, class Iterator>
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__device__ void reduceBlocks(const LatticeView<vobj> g_idata, typename vobj::scalar_object *g_odata, Iterator n) {
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typedef typename vobj::scalar_type scalar_type;
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typedef typename vobj::vector_type vector_type;
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typedef typename vobj::scalar_object sobj;
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constexpr Iterator nsimd = sizeof(vector_type)/sizeof(scalar_type);
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template <class vobj, class sobj, class Iterator>
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__device__ void reduceBlocks(const vobj *g_idata, sobj *g_odata, Iterator n)
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{
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constexpr Iterator nsimd = vobj::Nsimd();
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Iterator blockSize = blockDim.x;
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@ -109,13 +107,16 @@ __device__ void reduceBlocks(const LatticeView<vobj> g_idata, typename vobj::sca
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Iterator lane = i % nsimd;
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Iterator ss = i / nsimd;
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auto tmp = extractLane(lane,g_idata[ss]);
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mySum += tmp;
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sobj tmpD;
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tmpD=tmp;
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mySum +=tmpD;
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if (i + blockSize < n) {
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lane = (i+blockSize) % nsimd;
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ss = (i+blockSize) / nsimd;
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tmp = extractLane(lane,g_idata[ss]);
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mySum += tmp;
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tmpD = tmp;
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mySum += tmpD;
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}
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i += gridSize;
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}
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@ -126,9 +127,8 @@ __device__ void reduceBlocks(const LatticeView<vobj> g_idata, typename vobj::sca
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if (tid == 0) g_odata[blockIdx.x] = sdata[0];
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}
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template <class vobj, class Iterator>
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__global__ void reduceKernel(const LatticeView<vobj> lat, typename vobj::scalar_object *buffer, Iterator n) {
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typedef typename vobj::scalar_object sobj;
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template <class vobj, class sobj,class Iterator>
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__global__ void reduceKernel(const vobj *lat, sobj *buffer, Iterator n) {
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Iterator blockSize = blockDim.x;
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@ -179,32 +179,26 @@ __global__ void reduceKernel(const LatticeView<vobj> lat, typename vobj::scalar_
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}
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}
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/////////////////////////////////////////////////////////////////////////////////////////////////////////
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// Possibly promote to double and sum
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/////////////////////////////////////////////////////////////////////////////////////////////////////////
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template <class vobj>
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inline typename vobj::scalar_object sum_gpu(const Lattice<vobj> &lat)
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inline typename vobj::scalar_objectD sumD_gpu(const vobj *lat, Integer osites)
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{
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typedef typename vobj::scalar_objectD sobj;
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typedef decltype(lat) Iterator;
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LatticeView<vobj> lat_v = lat.View();
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Integer nsimd= vobj::Nsimd();
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Integer size = osites*nsimd;
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typedef typename vobj::scalar_object sobj;
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typedef decltype(lat_v.begin()) Iterator;
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Iterator size = lat.Grid()->lSites();
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Iterator numThreads, numBlocks;
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Integer numThreads, numBlocks;
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getNumBlocksAndThreads(size, sizeof(sobj), numThreads, numBlocks);
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Iterator smemSize = numThreads * sizeof(sobj);
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/*
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std::cout << GridLogDebug << "Starting reduction with:" << std::endl;
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std::cout << GridLogDebug << "\tsize = " << size << std::endl;
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std::cout << GridLogDebug << "\tnumThreads = " << numThreads << std::endl;
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std::cout << GridLogDebug << "\tnumBlocks = " << numBlocks << std::endl;
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std::cout << GridLogDebug << "\tsmemSize = " << smemSize << std::endl;
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*/
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Integer smemSize = numThreads * sizeof(sobj);
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Vector<sobj> buffer(numBlocks);
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sobj *buffer_v = &buffer[0];
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reduceKernel<<< numBlocks, numThreads, smemSize >>>(lat_v, buffer_v, size);
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reduceKernel<<< numBlocks, numThreads, smemSize >>>(lat, buffer_v, size);
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cudaDeviceSynchronize();
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cudaError err = cudaGetLastError();
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@ -212,10 +206,21 @@ inline typename vobj::scalar_object sum_gpu(const Lattice<vobj> &lat)
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printf("Cuda error %s\n",cudaGetErrorString( err ));
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exit(0);
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}
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auto result = buffer_v[0];
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lat.Grid()->GlobalSum(result);
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return result;
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}
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/////////////////////////////////////////////////////////////////////////////////////////////////////////
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// Return as same precision as input performing reduction in double precision though
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/////////////////////////////////////////////////////////////////////////////////////////////////////////
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template <class vobj>
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inline typename vobj::scalar_object sum_gpu(const vobj *lat, Integer osites)
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{
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typedef typename vobj::scalar_object sobj;
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sobj result;
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result = sumD_gpu(lat,osites);
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return result;
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}
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NAMESPACE_END(Grid);
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