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Interface to reduced precision comms

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This commit is contained in:
Peter Boyle
2025-06-13 05:04:12 +02:00
parent eea51bb604
commit f1ed988aa3
6 changed files with 33 additions and 206 deletions
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6
Grid/qcd/action/fermion/ImprovedStaggeredFermion.h
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@ -154,6 +154,12 @@ public:
StencilImpl Stencil;
StencilImpl StencilEven;
StencilImpl StencilOdd;
void SloppyComms(int sloppy)
{
Stencil.SetSloppyComms(sloppy);
StencilEven.SetSloppyComms(sloppy);
StencilOdd.SetSloppyComms(sloppy);
}
// Copy of the gauge field , with even and odd subsets
DoubledGaugeField Umu;

6
Grid/qcd/action/fermion/ImprovedStaggeredFermion5D.h
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@ -179,6 +179,12 @@ public:
StencilImpl Stencil;
StencilImpl StencilEven;
StencilImpl StencilOdd;
void SloppyComms(int sloppy)
{
Stencil.SetSloppyComms(sloppy);
StencilEven.SetSloppyComms(sloppy);
StencilOdd.SetSloppyComms(sloppy);
}
// Copy of the gauge field , with even and odd subsets
DoubledGaugeField Umu;

6
Grid/qcd/action/fermion/NaiveStaggeredFermion.h
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@ -146,6 +146,12 @@ public:
StencilImpl Stencil;
StencilImpl StencilEven;
StencilImpl StencilOdd;
void SloppyComms(int sloppy)
{
Stencil.SetSloppyComms(sloppy);
StencilEven.SetSloppyComms(sloppy);
StencilOdd.SetSloppyComms(sloppy);
}
// Copy of the gauge field , with even and odd subsets
DoubledGaugeField Umu;

206
Grid/qcd/action/fermion/WilsonCompressor.h
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@ -32,209 +32,6 @@ Author: paboyle <paboyle@ph.ed.ac.uk>
NAMESPACE_BEGIN(Grid);
///////////////////////////////////////////////////////////////
// Wilson compressor will need FaceGather policies for:
// Periodic, Dirichlet, and partial Dirichlet for DWF
///////////////////////////////////////////////////////////////
const int dwf_compressor_depth=2;
#define DWF_COMPRESS
class FaceGatherPartialDWF
{
public:
#ifdef DWF_COMPRESS
static int PartialCompressionFactor(GridBase *grid) {return grid->_fdimensions[0]/(2*dwf_compressor_depth);};
#else
static int PartialCompressionFactor(GridBase *grid) { return 1;}
#endif
template<class vobj,class cobj,class compressor>
static void Gather_plane_simple (deviceVector<std::pair<int,int> >& table,
const Lattice<vobj> &rhs,
cobj *buffer,
compressor &compress,
int off,int so,int partial)
{
//DWF only hack: If a direction that is OFF node we use Partial Dirichlet
// Shrinks local and remote comms buffers
GridBase *Grid = rhs.Grid();
int Ls = Grid->_rdimensions[0];
#ifdef DWF_COMPRESS
int depth=dwf_compressor_depth;
#else
int depth=Ls/2;
#endif
std::pair<int,int> *table_v = & table[0];
auto rhs_v = rhs.View(AcceleratorRead);
int vol=table.size()/Ls;
accelerator_forNB( idx,table.size(), vobj::Nsimd(), {
Integer i=idx/Ls;
Integer s=idx%Ls;
Integer sc=depth+s-(Ls-depth);
if(s<depth) compress.Compress(buffer[off+i+s*vol],rhs_v[so+table_v[idx].second]);
if(s>=Ls-depth) compress.Compress(buffer[off+i+sc*vol],rhs_v[so+table_v[idx].second]);
});
rhs_v.ViewClose();
}
template<class decompressor,class Decompression>
static void DecompressFace(decompressor decompress,Decompression &dd)
{
auto Ls = dd.dims[0];
#ifdef DWF_COMPRESS
int depth=dwf_compressor_depth;
#else
int depth=Ls/2;
#endif
// Just pass in the Grid
auto kp = dd.kernel_p;
auto mp = dd.mpi_p;
int size= dd.buffer_size;
int vol= size/Ls;
accelerator_forNB(o,size,1,{
int idx=o/Ls;
int s=o%Ls;
if ( s < depth ) {
int oo=s*vol+idx;
kp[o]=mp[oo];
} else if ( s >= Ls-depth ) {
int sc = depth + s - (Ls-depth);
int oo=sc*vol+idx;
kp[o]=mp[oo];
} else {
kp[o] = Zero();//fill rest with zero if partial dirichlet
}
});
}
////////////////////////////////////////////////////////////////////////////////////////////
// Need to gather *interior portions* for ALL s-slices in simd directions
// Do the gather as need to treat SIMD lanes differently, and insert zeroes on receive side
// Reorder the fifth dim to be s=Ls-1 , s=0, s=1,...,Ls-2.
////////////////////////////////////////////////////////////////////////////////////////////
template<class vobj,class cobj,class compressor>
static void Gather_plane_exchange(deviceVector<std::pair<int,int> >& table,const Lattice<vobj> &rhs,
std::vector<cobj *> pointers,int dimension,int plane,int cbmask,
compressor &compress,int type,int partial)
{
GridBase *Grid = rhs.Grid();
int Ls = Grid->_rdimensions[0];
#ifdef DWF_COMPRESS
int depth=dwf_compressor_depth;
#else
int depth = Ls/2;
#endif
// insertion of zeroes...
assert( (table.size()&0x1)==0);
int num=table.size()/2;
int so = plane*rhs.Grid()->_ostride[dimension]; // base offset for start of plane
auto rhs_v = rhs.View(AcceleratorRead);
auto p0=&pointers[0][0];
auto p1=&pointers[1][0];
auto tp=&table[0];
int nnum=num/Ls;
accelerator_forNB(j, num, vobj::Nsimd(), {
// Reorders both local and remote comms buffers
//
int s = j % Ls;
int sp1 = (s+depth)%Ls; // peri incremented s slice
int hxyz= j/Ls;
int xyz0= hxyz*2; // xyzt part of coor
int xyz1= hxyz*2+1;
int jj= hxyz + sp1*nnum ; // 0,1,2,3 -> Ls-1 slice , 0-slice, 1-slice ....
int kk0= xyz0*Ls + s ; // s=0 goes to s=1
int kk1= xyz1*Ls + s ; // s=Ls-1 -> s=0
compress.CompressExchange(p0[jj],p1[jj],
rhs_v[so+tp[kk0 ].second], // Same s, consecutive xyz sites
rhs_v[so+tp[kk1 ].second],
type);
});
rhs_v.ViewClose();
}
// Merge routine is for SIMD faces
template<class decompressor,class Merger>
static void MergeFace(decompressor decompress,Merger &mm)
{
auto Ls = mm.dims[0];
#ifdef DWF_COMPRESS
int depth=dwf_compressor_depth;
#else
int depth = Ls/2;
#endif
int num= mm.buffer_size/2; // relate vol and Ls to buffer size
auto mp = &mm.mpointer[0];
auto vp0= &mm.vpointers[0][0]; // First arg is exchange first
auto vp1= &mm.vpointers[1][0];
auto type= mm.type;
int nnum = num/Ls;
accelerator_forNB(o,num,Merger::Nsimd,{
int s=o%Ls;
int hxyz=o/Ls; // xyzt related component
int xyz0=hxyz*2;
int xyz1=hxyz*2+1;
int sp = (s+depth)%Ls;
int jj= hxyz + sp*nnum ; // 0,1,2,3 -> Ls-1 slice , 0-slice, 1-slice ....
int oo0= s+xyz0*Ls;
int oo1= s+xyz1*Ls;
// same ss0, ss1 pair goes to new layout
decompress.Exchange(mp[oo0],mp[oo1],vp0[jj],vp1[jj],type);
});
}
};
class FaceGatherDWFMixedBCs
{
public:
#ifdef DWF_COMPRESS
static int PartialCompressionFactor(GridBase *grid) {return grid->_fdimensions[0]/(2*dwf_compressor_depth);};
#else
static int PartialCompressionFactor(GridBase *grid) {return 1;}
#endif
template<class vobj,class cobj,class compressor>
static void Gather_plane_simple (deviceVector<std::pair<int,int> >& table,
const Lattice<vobj> &rhs,
cobj *buffer,
compressor &compress,
int off,int so,int partial)
{
// std::cout << " face gather simple DWF partial "<<partial <<std::endl;
if(partial) FaceGatherPartialDWF::Gather_plane_simple(table,rhs,buffer,compress,off,so,partial);
else FaceGatherSimple::Gather_plane_simple(table,rhs,buffer,compress,off,so,partial);
}
template<class vobj,class cobj,class compressor>
static void Gather_plane_exchange(deviceVector<std::pair<int,int> >& table,const Lattice<vobj> &rhs,
std::vector<cobj *> pointers,int dimension,int plane,int cbmask,
compressor &compress,int type,int partial)
{
// std::cout << " face gather exch DWF partial "<<partial <<std::endl;
if(partial) FaceGatherPartialDWF::Gather_plane_exchange(table,rhs,pointers,dimension, plane,cbmask,compress,type,partial);
else FaceGatherSimple::Gather_plane_exchange (table,rhs,pointers,dimension, plane,cbmask,compress,type,partial);
}
template<class decompressor,class Merger>
static void MergeFace(decompressor decompress,Merger &mm)
{
int partial = mm.partial;
// std::cout << " merge DWF partial "<<partial <<std::endl;
if ( partial ) FaceGatherPartialDWF::MergeFace(decompress,mm);
else FaceGatherSimple::MergeFace(decompress,mm);
}
template<class decompressor,class Decompression>
static void DecompressFace(decompressor decompress,Decompression &dd)
{
int partial = dd.partial;
// std::cout << " decompress DWF partial "<<partial <<std::endl;
if ( partial ) FaceGatherPartialDWF::DecompressFace(decompress,dd);
else FaceGatherSimple::DecompressFace(decompress,dd);
}
};
/////////////////////////////////////////////////////////////////////////////////////////////
// optimised versions supporting half precision too??? Deprecate
/////////////////////////////////////////////////////////////////////////////////////////////
@ -242,8 +39,7 @@ public:
//Could make FaceGather a template param, but then behaviour is runtime not compile time
template<class _HCspinor,class _Hspinor,class _Spinor, class projector>
class WilsonCompressorTemplate : public FaceGatherDWFMixedBCs
// : public FaceGatherSimple
class WilsonCompressorTemplate : public FaceGatherSimple
{
public:

6
Grid/qcd/action/fermion/WilsonFermion.h
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@ -165,6 +165,12 @@ public:
StencilImpl Stencil;
StencilImpl StencilEven;
StencilImpl StencilOdd;
void SloppyComms(int sloppy)
{
Stencil.SetSloppyComms(sloppy);
StencilEven.SetSloppyComms(sloppy);
StencilOdd.SetSloppyComms(sloppy);
}
// Copy of the gauge field , with even and odd subsets
DoubledGaugeField Umu;

7
Grid/qcd/action/fermion/WilsonFermion5D.h
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@ -205,6 +205,13 @@ public:
DoubledGaugeField UmuEven;
DoubledGaugeField UmuOdd;
void SloppyComms(int sloppy)
{
Stencil.SetSloppyComms(sloppy);
StencilEven.SetSloppyComms(sloppy);
StencilOdd.SetSloppyComms(sloppy);
}
// Comms buffer
// std::vector<SiteHalfSpinor,alignedAllocator<SiteHalfSpinor> > comm_buf;