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Grid/Grid/qcd/action/fermion/implementation/WilsonKernelsImplementation.h
Peter Boyle fe700a183a Getting HMC to run
2019-07-26 12:18:29 +01:00

533 lines
20 KiB
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/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./lib/qcd/action/fermion/WilsonKernels.cc
Copyright (C) 2015
Author: Peter Boyle <paboyle@ph.ed.ac.uk>
Author: Peter Boyle <peterboyle@Peters-MacBook-Pro-2.local>
Author: paboyle <paboyle@ph.ed.ac.uk>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
See the full license in the file "LICENSE" in the top level distribution
directory
*************************************************************************************/
/* END LEGAL */
#pragma once
#include <Grid/qcd/action/fermion/FermionCore.h>
NAMESPACE_BEGIN(Grid);
////////////////////////////////////////////
// Generic implementation; move to different file?
////////////////////////////////////////////
accelerator_inline void get_stencil(StencilEntry * mem, StencilEntry &chip)
{
#ifdef __CUDA_ARCH__
static_assert(sizeof(StencilEntry)==sizeof(uint4),"Unexpected Stencil Entry Size");
uint4 * mem_pun = (uint4 *)mem; // force 128 bit loads
uint4 * chip_pun = (uint4 *)&chip;
* chip_pun = * mem_pun;
#else
chip = *mem;
#endif
return;
}
#define GENERIC_STENCIL_LEG(Dir,spProj,Recon) \
SE = st.GetEntry(ptype, Dir, sF); \
if (SE->_is_local) { \
int perm= SE->_permute; \
auto tmp = coalescedReadPermute(in[SE->_offset],ptype,perm,lane); \
spProj(chi,tmp); \
} else { \
chi = coalescedRead(buf[SE->_offset],lane); \
} \
synchronise(); \
Impl::multLink(Uchi, U[sU], chi, Dir, SE, st); \
Recon(result, Uchi);
#define GENERIC_STENCIL_LEG_INT(Dir,spProj,Recon) \
SE = st.GetEntry(ptype, Dir, sF); \
if (SE->_is_local) { \
int perm= SE->_permute; \
auto tmp = coalescedReadPermute(in[SE->_offset],ptype,perm,lane); \
spProj(chi,tmp); \
} else if ( st.same_node[Dir] ) { \
chi = coalescedRead(buf[SE->_offset],lane); \
} \
synchronise(); \
if (SE->_is_local || st.same_node[Dir] ) { \
Impl::multLink(Uchi, U[sU], chi, Dir, SE, st); \
Recon(result, Uchi); \
} \
synchronise();
#define GENERIC_STENCIL_LEG_EXT(Dir,spProj,Recon) \
SE = st.GetEntry(ptype, Dir, sF); \
if ((!SE->_is_local) && (!st.same_node[Dir]) ) { \
auto chi = coalescedRead(buf[SE->_offset],lane); \
Impl::multLink(Uchi, U[sU], chi, Dir, SE, st); \
Recon(result, Uchi); \
nmu++; \
} \
synchronise();
#define GENERIC_DHOPDIR_LEG(Dir,spProj,Recon) \
if (gamma == Dir) { \
if (SE->_is_local ) { \
int perm= SE->_permute; \
auto tmp = coalescedReadPermute(in[SE->_offset],ptype,perm,lane); \
spProj(chi,tmp); \
} else { \
chi = coalescedRead(buf[SE->_offset],lane); \
} \
synchronise(); \
Impl::multLink(Uchi, U[sU], chi, dir, SE, st); \
Recon(result, Uchi); \
synchronise(); \
}
////////////////////////////////////////////////////////////////////
// All legs kernels ; comms then compute
////////////////////////////////////////////////////////////////////
template <class Impl>
void WilsonKernels<Impl>::GenericDhopSiteDag(StencilView &st, DoubledGaugeFieldView &U,
SiteHalfSpinor *buf, int sF,
int sU, const FermionFieldView &in, FermionFieldView &out)
{
typedef decltype(coalescedRead(buf[0])) calcHalfSpinor;
typedef decltype(coalescedRead(in[0])) calcSpinor;
calcHalfSpinor chi;
// calcHalfSpinor *chi_p;
calcHalfSpinor Uchi;
calcSpinor result;
StencilEntry *SE;
int ptype;
const int Nsimd = SiteHalfSpinor::Nsimd();
const int lane=SIMTlane(Nsimd);
GENERIC_STENCIL_LEG(Xp,spProjXp,spReconXp);
GENERIC_STENCIL_LEG(Yp,spProjYp,accumReconYp);
GENERIC_STENCIL_LEG(Zp,spProjZp,accumReconZp);
GENERIC_STENCIL_LEG(Tp,spProjTp,accumReconTp);
GENERIC_STENCIL_LEG(Xm,spProjXm,accumReconXm);
GENERIC_STENCIL_LEG(Ym,spProjYm,accumReconYm);
GENERIC_STENCIL_LEG(Zm,spProjZm,accumReconZm);
GENERIC_STENCIL_LEG(Tm,spProjTm,accumReconTm);
coalescedWrite(out[sF],result,lane);
};
template <class Impl>
void WilsonKernels<Impl>::GenericDhopSite(StencilView &st, DoubledGaugeFieldView &U,
SiteHalfSpinor *buf, int sF,
int sU, const FermionFieldView &in, FermionFieldView &out)
{
typedef decltype(coalescedRead(buf[0])) calcHalfSpinor;
typedef decltype(coalescedRead(in[0])) calcSpinor;
calcHalfSpinor chi;
// calcHalfSpinor *chi_p;
calcHalfSpinor Uchi;
calcSpinor result;
StencilEntry *SE;
int ptype;
const int Nsimd = SiteHalfSpinor::Nsimd();
const int lane=SIMTlane(Nsimd);
GENERIC_STENCIL_LEG(Xm,spProjXp,spReconXp);
GENERIC_STENCIL_LEG(Ym,spProjYp,accumReconYp);
GENERIC_STENCIL_LEG(Zm,spProjZp,accumReconZp);
GENERIC_STENCIL_LEG(Tm,spProjTp,accumReconTp);
GENERIC_STENCIL_LEG(Xp,spProjXm,accumReconXm);
GENERIC_STENCIL_LEG(Yp,spProjYm,accumReconYm);
GENERIC_STENCIL_LEG(Zp,spProjZm,accumReconZm);
GENERIC_STENCIL_LEG(Tp,spProjTm,accumReconTm);
coalescedWrite(out[sF], result,lane);
};
////////////////////////////////////////////////////////////////////
// Interior kernels
////////////////////////////////////////////////////////////////////
template <class Impl>
void WilsonKernels<Impl>::GenericDhopSiteDagInt(StencilView &st, DoubledGaugeFieldView &U,
SiteHalfSpinor *buf, int sF,
int sU, const FermionFieldView &in, FermionFieldView &out)
{
typedef decltype(coalescedRead(buf[0])) calcHalfSpinor;
typedef decltype(coalescedRead(in[0])) calcSpinor;
calcHalfSpinor chi;
// calcHalfSpinor *chi_p;
calcHalfSpinor Uchi;
calcSpinor result;
StencilEntry *SE;
int ptype;
const int Nsimd = SiteHalfSpinor::Nsimd();
const int lane=SIMTlane(Nsimd);
result=Zero();
GENERIC_STENCIL_LEG_INT(Xp,spProjXp,accumReconXp);
GENERIC_STENCIL_LEG_INT(Yp,spProjYp,accumReconYp);
GENERIC_STENCIL_LEG_INT(Zp,spProjZp,accumReconZp);
GENERIC_STENCIL_LEG_INT(Tp,spProjTp,accumReconTp);
GENERIC_STENCIL_LEG_INT(Xm,spProjXm,accumReconXm);
GENERIC_STENCIL_LEG_INT(Ym,spProjYm,accumReconYm);
GENERIC_STENCIL_LEG_INT(Zm,spProjZm,accumReconZm);
GENERIC_STENCIL_LEG_INT(Tm,spProjTm,accumReconTm);
coalescedWrite(out[sF], result,lane);
};
template <class Impl>
void WilsonKernels<Impl>::GenericDhopSiteInt(StencilView &st, DoubledGaugeFieldView &U,
SiteHalfSpinor *buf, int sF,
int sU, const FermionFieldView &in, FermionFieldView &out)
{
typedef decltype(coalescedRead(buf[0])) calcHalfSpinor;
typedef decltype(coalescedRead(in[0])) calcSpinor;
const int Nsimd = SiteHalfSpinor::Nsimd();
const int lane=SIMTlane(Nsimd);
calcHalfSpinor chi;
// calcHalfSpinor *chi_p;
calcHalfSpinor Uchi;
calcSpinor result;
StencilEntry *SE;
int ptype;
result=Zero();
GENERIC_STENCIL_LEG_INT(Xm,spProjXp,accumReconXp);
GENERIC_STENCIL_LEG_INT(Ym,spProjYp,accumReconYp);
GENERIC_STENCIL_LEG_INT(Zm,spProjZp,accumReconZp);
GENERIC_STENCIL_LEG_INT(Tm,spProjTp,accumReconTp);
GENERIC_STENCIL_LEG_INT(Xp,spProjXm,accumReconXm);
GENERIC_STENCIL_LEG_INT(Yp,spProjYm,accumReconYm);
GENERIC_STENCIL_LEG_INT(Zp,spProjZm,accumReconZm);
GENERIC_STENCIL_LEG_INT(Tp,spProjTm,accumReconTm);
coalescedWrite(out[sF], result,lane);
};
////////////////////////////////////////////////////////////////////
// Exterior kernels
////////////////////////////////////////////////////////////////////
template <class Impl>
void WilsonKernels<Impl>::GenericDhopSiteDagExt(StencilView &st, DoubledGaugeFieldView &U,
SiteHalfSpinor *buf, int sF,
int sU, const FermionFieldView &in, FermionFieldView &out)
{
typedef decltype(coalescedRead(buf[0])) calcHalfSpinor;
typedef decltype(coalescedRead(in[0])) calcSpinor;
// calcHalfSpinor *chi_p;
calcHalfSpinor Uchi;
calcSpinor result;
StencilEntry *SE;
int ptype;
int nmu=0;
const int Nsimd = SiteHalfSpinor::Nsimd();
const int lane=SIMTlane(Nsimd);
result=Zero();
GENERIC_STENCIL_LEG_EXT(Xp,spProjXp,accumReconXp);
GENERIC_STENCIL_LEG_EXT(Yp,spProjYp,accumReconYp);
GENERIC_STENCIL_LEG_EXT(Zp,spProjZp,accumReconZp);
GENERIC_STENCIL_LEG_EXT(Tp,spProjTp,accumReconTp);
GENERIC_STENCIL_LEG_EXT(Xm,spProjXm,accumReconXm);
GENERIC_STENCIL_LEG_EXT(Ym,spProjYm,accumReconYm);
GENERIC_STENCIL_LEG_EXT(Zm,spProjZm,accumReconZm);
GENERIC_STENCIL_LEG_EXT(Tm,spProjTm,accumReconTm);
if ( nmu ) {
auto out_t = coalescedRead(out[sF],lane);
out_t = out_t + result;
coalescedWrite(out[sF],out_t,lane);
}
};
template <class Impl>
void WilsonKernels<Impl>::GenericDhopSiteExt(StencilView &st, DoubledGaugeFieldView &U,
SiteHalfSpinor *buf, int sF,
int sU, const FermionFieldView &in, FermionFieldView &out)
{
typedef decltype(coalescedRead(buf[0])) calcHalfSpinor;
typedef decltype(coalescedRead(in[0])) calcSpinor;
// calcHalfSpinor *chi_p;
calcHalfSpinor Uchi;
calcSpinor result;
StencilEntry *SE;
int ptype;
int nmu=0;
const int Nsimd = SiteHalfSpinor::Nsimd();
const int lane=SIMTlane(Nsimd);
result=Zero();
GENERIC_STENCIL_LEG_EXT(Xm,spProjXp,accumReconXp);
GENERIC_STENCIL_LEG_EXT(Ym,spProjYp,accumReconYp);
GENERIC_STENCIL_LEG_EXT(Zm,spProjZp,accumReconZp);
GENERIC_STENCIL_LEG_EXT(Tm,spProjTp,accumReconTp);
GENERIC_STENCIL_LEG_EXT(Xp,spProjXm,accumReconXm);
GENERIC_STENCIL_LEG_EXT(Yp,spProjYm,accumReconYm);
GENERIC_STENCIL_LEG_EXT(Zp,spProjZm,accumReconZm);
GENERIC_STENCIL_LEG_EXT(Tp,spProjTm,accumReconTm);
if ( nmu ) {
auto out_t = coalescedRead(out[sF],lane);
out_t = out_t + result;
coalescedWrite(out[sF],out_t,lane);
}
};
template <class Impl>
void WilsonKernels<Impl>::DhopDirK( StencilView &st, DoubledGaugeFieldView &U,SiteHalfSpinor *buf, int sF,
int sU, const FermionFieldView &in, FermionFieldView &out, int dir, int gamma)
{
typedef decltype(coalescedRead(buf[0])) calcHalfSpinor;
typedef decltype(coalescedRead(in[0])) calcSpinor;
calcHalfSpinor chi;
calcSpinor result;
calcHalfSpinor Uchi;
StencilEntry *SE;
int ptype;
const int Nsimd = SiteHalfSpinor::Nsimd();
const int lane=SIMTlane(Nsimd);
SE = st.GetEntry(ptype, dir, sF);
if (gamma == Xp) {
if (SE->_is_local ) {
int perm= SE->_permute;
auto tmp = coalescedReadPermute(in[SE->_offset],ptype,perm,lane);
spProjXp(chi,tmp);
} else {
chi = coalescedRead(buf[SE->_offset],lane);
}
Impl::multLink(Uchi, U[sU], chi, dir, SE, st);
spReconXp(result, Uchi);
}
GENERIC_DHOPDIR_LEG(Yp,spProjYp,spReconYp);
GENERIC_DHOPDIR_LEG(Zp,spProjZp,spReconZp);
GENERIC_DHOPDIR_LEG(Tp,spProjTp,spReconTp);
GENERIC_DHOPDIR_LEG(Xm,spProjXm,spReconXm);
GENERIC_DHOPDIR_LEG(Ym,spProjYm,spReconYm);
GENERIC_DHOPDIR_LEG(Zm,spProjZm,spReconZm);
GENERIC_DHOPDIR_LEG(Tm,spProjTm,spReconTm);
coalescedWrite(out[sF], result,lane);
}
#define KERNEL_CALLNB(A) \
const uint64_t NN = Nsite*Ls; \
accelerator_forNB( ss, NN, Simd::Nsimd(), { \
int sF = ss; \
int sU = ss/Ls; \
WilsonKernels<Impl>::A(st_v,U_v,buf,sF,sU,in_v,out_v); \
});
#define KERNEL_CALL(A) KERNEL_CALLNB(A); accelerator_barrier();
#define ASM_CALL(A) \
thread_for( ss, Nsite, { \
int sU = ss; \
int sF = ss*Ls; \
WilsonKernels<Impl>::A(st_v,U_v,buf,sF,sU,Ls,1,in_v,out_v); \
});
template <class Impl>
void WilsonKernels<Impl>::DhopKernel(int Opt,StencilImpl &st, DoubledGaugeField &U, SiteHalfSpinor * buf,
int Ls, int Nsite, const FermionField &in, FermionField &out,
int interior,int exterior)
{
auto U_v = U.View();
auto in_v = in.View();
auto out_v = out.View();
auto st_v = st.View();
if( interior && exterior ) {
if (Opt == WilsonKernelsStatic::OptGeneric ) { KERNEL_CALL(GenericDhopSite); return;}
#ifndef GRID_NVCC
if (Opt == WilsonKernelsStatic::OptHandUnroll ) { KERNEL_CALL(HandDhopSite); return;}
if (Opt == WilsonKernelsStatic::OptInlineAsm ) { ASM_CALL(AsmDhopSite); printf("."); return;}
#endif
} else if( interior ) {
if (Opt == WilsonKernelsStatic::OptGeneric ) { KERNEL_CALLNB(GenericDhopSiteInt); return;}
#ifndef GRID_NVCC
if (Opt == WilsonKernelsStatic::OptHandUnroll ) { KERNEL_CALLNB(HandDhopSiteInt); return;}
if (Opt == WilsonKernelsStatic::OptInlineAsm ) { ASM_CALL(AsmDhopSiteInt); printf("-"); return;}
#endif
} else if( exterior ) {
if (Opt == WilsonKernelsStatic::OptGeneric ) { KERNEL_CALL(GenericDhopSiteExt); return;}
#ifndef GRID_NVCC
if (Opt == WilsonKernelsStatic::OptHandUnroll ) { KERNEL_CALL(HandDhopSiteExt); return;}
if (Opt == WilsonKernelsStatic::OptInlineAsm ) { ASM_CALL(AsmDhopSiteExt); printf("+"); return;}
#endif
}
assert(0 && " Kernel optimisation case not covered ");
}
template <class Impl>
void WilsonKernels<Impl>::DhopDagKernel(int Opt,StencilImpl &st, DoubledGaugeField &U, SiteHalfSpinor * buf,
int Ls, int Nsite, const FermionField &in, FermionField &out,
int interior,int exterior)
{
auto U_v = U.View();
auto in_v = in.View();
auto out_v = out.View();
auto st_v = st.View();
if( interior && exterior ) {
if (Opt == WilsonKernelsStatic::OptGeneric ) { KERNEL_CALL(GenericDhopSiteDag); return;}
#ifndef GRID_NVCC
if (Opt == WilsonKernelsStatic::OptHandUnroll ) { KERNEL_CALL(HandDhopSiteDag); return;}
if (Opt == WilsonKernelsStatic::OptInlineAsm ) { ASM_CALL(AsmDhopSiteDag); return;}
#endif
} else if( interior ) {
if (Opt == WilsonKernelsStatic::OptGeneric ) { KERNEL_CALL(GenericDhopSiteDagInt); return;}
#ifndef GRID_NVCC
if (Opt == WilsonKernelsStatic::OptHandUnroll ) { KERNEL_CALL(HandDhopSiteDagInt); return;}
if (Opt == WilsonKernelsStatic::OptInlineAsm ) { ASM_CALL(AsmDhopSiteDagInt); return;}
#endif
} else if( exterior ) {
if (Opt == WilsonKernelsStatic::OptGeneric ) { KERNEL_CALL(GenericDhopSiteDagExt); return;}
#ifndef GRID_NVCC
if (Opt == WilsonKernelsStatic::OptHandUnroll ) { KERNEL_CALL(HandDhopSiteDagExt); return;}
if (Opt == WilsonKernelsStatic::OptInlineAsm ) { ASM_CALL(AsmDhopSiteDagExt); return;}
#endif
}
assert(0 && " Kernel optimisation case not covered ");
}
/*******************************************************************************
* Conserved current utilities for Wilson fermions, for contracting propagators
* to make a conserved current sink or inserting the conserved current
* sequentially. Common to both 4D and 5D.
******************************************************************************/
// N.B. Functions below assume a -1/2 factor within U.
#define WilsonCurrentFwd(expr, mu) ((expr - Gamma::gmu[mu]*expr))
#define WilsonCurrentBwd(expr, mu) ((expr + Gamma::gmu[mu]*expr))
/*******************************************************************************
* Name: ContractConservedCurrentSiteFwd
* Operation: (1/2) * q2[x] * U(x) * (g[mu] - 1) * q1[x + mu]
* Notes: - DoubledGaugeField U assumed to contain -1/2 factor.
* - Pass in q_in_1 shifted in +ve mu direction.
******************************************************************************/
template<class Impl>
void WilsonKernels<Impl>::ContractConservedCurrentSiteFwd(const SitePropagator &q_in_1,
const SitePropagator &q_in_2,
SitePropagator &q_out,
DoubledGaugeFieldView &U,
unsigned int sU,
unsigned int mu,
bool switch_sign)
{
SitePropagator result, tmp;
Gamma g5(Gamma::Algebra::Gamma5);
Impl::multLink(tmp, U[sU], q_in_1, mu);
result = g5 * adj(q_in_2) * g5 * WilsonCurrentFwd(tmp, mu);
if (switch_sign) {
q_out -= result;
} else {
q_out += result;
}
}
/*******************************************************************************
* Name: ContractConservedCurrentSiteBwd
* Operation: (1/2) * q2[x + mu] * U^dag(x) * (g[mu] + 1) * q1[x]
* Notes: - DoubledGaugeField U assumed to contain -1/2 factor.
* - Pass in q_in_2 shifted in +ve mu direction.
******************************************************************************/
template<class Impl>
void WilsonKernels<Impl>::ContractConservedCurrentSiteBwd(const SitePropagator &q_in_1,
const SitePropagator &q_in_2,
SitePropagator &q_out,
DoubledGaugeFieldView &U,
unsigned int sU,
unsigned int mu,
bool switch_sign)
{
SitePropagator result, tmp;
Gamma g5(Gamma::Algebra::Gamma5);
Impl::multLink(tmp, U[sU], q_in_1, mu + Nd);
result = g5 * adj(q_in_2) * g5 * WilsonCurrentBwd(tmp, mu);
if (switch_sign) {
q_out += result;
} else {
q_out -= result;
}
}
/*******************************************************************************
* Name: SeqConservedCurrentSiteFwd
* Operation: (1/2) * U(x) * (g[mu] - 1) * q[x + mu]
* Notes: - DoubledGaugeField U assumed to contain -1/2 factor.
* - Pass in q_in shifted in +ve mu direction.
******************************************************************************/
template<class Impl>
void WilsonKernels<Impl>::SeqConservedCurrentSiteFwd(const SitePropagator &q_in,
SitePropagator &q_out,
DoubledGaugeFieldView &U,
unsigned int sU,
unsigned int mu,
vPredicate t_mask,
bool switch_sign)
{
SitePropagator result;
Impl::multLink(result, U[sU], q_in, mu);
result = WilsonCurrentFwd(result, mu);
// Zero any unwanted timeslice entries.
result = predicatedWhere(t_mask, result, 0.*result);
if (switch_sign) {
q_out -= result;
} else {
q_out += result;
}
}
/*******************************************************************************
* Name: SeqConservedCurrentSiteFwd
* Operation: (1/2) * U^dag(x) * (g[mu] + 1) * q[x - mu]
* Notes: - DoubledGaugeField U assumed to contain -1/2 factor.
* - Pass in q_in shifted in -ve mu direction.
******************************************************************************/
template<class Impl>
void WilsonKernels<Impl>::SeqConservedCurrentSiteBwd(const SitePropagator &q_in,
SitePropagator &q_out,
DoubledGaugeFieldView &U,
unsigned int sU,
unsigned int mu,
vPredicate t_mask,
bool switch_sign)
{
SitePropagator result;
Impl::multLink(result, U[sU], q_in, mu + Nd);
result = WilsonCurrentBwd(result, mu);
// Zero any unwanted timeslice entries.
result = predicatedWhere(t_mask, result, 0.*result);
if (switch_sign) {
q_out += result;
} else {
q_out -= result;
}
}
NAMESPACE_END(Grid);
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