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Merge pull request #455 from clarkedavida/hisq_fat_links

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Hisq fat links
This commit is contained in:
Peter Boyle 2024-02-29 15:29:39 -05:00 committed by GitHub
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8 changed files with 907 additions and 46 deletions
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4
.gitignore vendored
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@ -1,3 +1,7 @@
# Doxygen stuff
html/*
latex/*
# Compiled Object files #
#########################
*.slo

41
Grid/log/Log.h
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@ -179,11 +179,11 @@ extern GridLogger GridLogSolver;
extern GridLogger GridLogError;
extern GridLogger GridLogWarning;
extern GridLogger GridLogMessage;
extern GridLogger GridLogDebug ;
extern GridLogger GridLogDebug;
extern GridLogger GridLogPerformance;
extern GridLogger GridLogDslash;
extern GridLogger GridLogIterative ;
extern GridLogger GridLogIntegrator ;
extern GridLogger GridLogIterative;
extern GridLogger GridLogIntegrator;
extern GridLogger GridLogHMC;
extern GridLogger GridLogMemory;
extern GridLogger GridLogTracing;
@ -191,6 +191,41 @@ extern Colours GridLogColours;
std::string demangle(const char* name) ;
template<typename... Args>
inline std::string sjoin(Args&&... args) noexcept {
std::ostringstream msg;
(msg << ... << args);
return msg.str();
}
/*! @brief make log messages work like python print */
template <typename... Args>
inline void Grid_log(Args&&... args) {
std::string msg = sjoin(std::forward<Args>(args)...);
std::cout << GridLogMessage << msg << std::endl;
}
/*! @brief make warning messages work like python print */
template <typename... Args>
inline void Grid_warn(Args&&... args) {
std::string msg = sjoin(std::forward<Args>(args)...);
std::cout << "\033[33m" << GridLogWarning << msg << "\033[0m" << std::endl;
}
/*! @brief make error messages work like python print */
template <typename... Args>
inline void Grid_error(Args&&... args) {
std::string msg = sjoin(std::forward<Args>(args)...);
std::cout << "\033[31m" << GridLogError << msg << "\033[0m" << std::endl;
}
/*! @brief make pass messages work like python print */
template <typename... Args>
inline void Grid_pass(Args&&... args) {
std::string msg = sjoin(std::forward<Args>(args)...);
std::cout << "\033[32m" << GridLogMessage << msg << "\033[0m" << std::endl;
}
#define _NBACKTRACE (256)
extern void * Grid_backtrace_buffer[_NBACKTRACE];

389
Grid/qcd/smearing/HISQSmearing.h Normal file
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@ -0,0 +1,389 @@
/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./lib/qcd/smearing/HISQSmearing.h
Copyright (C) 2023
Author: D. A. Clarke <clarke.davida@gmail.com>
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
*************************************************************************************/
/*
@file HISQSmearing.h
@brief Declares classes related to HISQ smearing
*/
#pragma once
#include <Grid/Grid.h>
#include <Grid/lattice/PaddedCell.h>
#include <Grid/stencil/GeneralLocalStencil.h>
NAMESPACE_BEGIN(Grid);
// TODO: find a way to fold this into the stencil header. need to access grid to get
// Nd, since you don't want to inherit from QCD.h
/*! @brief append arbitrary shift path to shifts */
template<typename... Args>
void appendShift(std::vector<Coordinate>& shifts, int dir, Args... args) {
Coordinate shift(Nd,0);
generalShift(shift, dir, args...);
// push_back creates an element at the end of shifts and
// assigns the data in the argument to it.
shifts.push_back(shift);
}
/*! @brief figure out the stencil index from mu and nu */
accelerator_inline int stencilIndex(int mu, int nu) {
// Nshifts depends on how you built the stencil
int Nshifts = 6;
return Nshifts*nu + Nd*Nshifts*mu;
}
/*! @brief structure holding the link treatment */
struct SmearingParameters{
SmearingParameters(){}
Real c_1; // 1 link
Real c_naik; // Naik term
Real c_3; // 3 link
Real c_5; // 5 link
Real c_7; // 7 link
Real c_lp; // 5 link Lepage
SmearingParameters(Real c1, Real cnaik, Real c3, Real c5, Real c7, Real clp)
: c_1(c1),
c_naik(cnaik),
c_3(c3),
c_5(c5),
c_7(c7),
c_lp(clp){}
};
/*! @brief create fat links from link variables */
template<class Gimpl>
class Smear_HISQ : public Gimpl {
private:
GridCartesian* const _grid;
SmearingParameters _linkTreatment;
public:
INHERIT_GIMPL_TYPES(Gimpl);
typedef typename Gimpl::GaugeField GF;
typedef typename Gimpl::GaugeLinkField LF;
typedef typename Gimpl::ComplexField CF;
// Don't allow default values here.
Smear_HISQ(GridCartesian* grid, Real c1, Real cnaik, Real c3, Real c5, Real c7, Real clp)
: _grid(grid),
_linkTreatment(c1,cnaik,c3,c5,c7,clp) {
assert(Nc == 3 && "HISQ smearing currently implemented only for Nc==3");
assert(Nd == 4 && "HISQ smearing only defined for Nd==4");
}
// Allow to pass a pointer to a C-style, double array for MILC convenience
Smear_HISQ(GridCartesian* grid, double* coeff)
: _grid(grid),
_linkTreatment(coeff[0],coeff[1],coeff[2],coeff[3],coeff[4],coeff[5]) {
assert(Nc == 3 && "HISQ smearing currently implemented only for Nc==3");
assert(Nd == 4 && "HISQ smearing only defined for Nd==4");
}
~Smear_HISQ() {}
// Intent: OUT--u_smr, u_naik
// IN--u_thin
void smear(GF& u_smr, GF& u_naik, GF& u_thin) const {
SmearingParameters lt = this->_linkTreatment;
auto grid = this->_grid;
// Create a padded cell of extra padding depth=1 and fill the padding.
int depth = 1;
PaddedCell Ghost(depth,grid);
GF Ughost = Ghost.Exchange(u_thin);
// This is where auxiliary N-link fields and the final smear will be stored.
GF Ughost_fat(Ughost.Grid());
GF Ughost_3link(Ughost.Grid());
GF Ughost_5linkA(Ughost.Grid());
GF Ughost_5linkB(Ughost.Grid());
// mu-nu plane stencil. We allow mu==nu to make indexing the stencil easier,
// but these entries will not be used.
std::vector<Coordinate> shifts;
for(int mu=0;mu<Nd;mu++)
for(int nu=0;nu<Nd;nu++) {
appendShift(shifts,mu);
appendShift(shifts,nu);
appendShift(shifts,shiftSignal::NO_SHIFT);
appendShift(shifts,mu,Back(nu));
appendShift(shifts,Back(nu));
appendShift(shifts,Back(mu));
}
// A GeneralLocalStencil has two indices: a site and stencil index
GeneralLocalStencil gStencil(Ughost.Grid(),shifts);
// This is where contributions from the smearing get added together
Ughost_fat=Zero();
// This loop handles 3-, 5-, and 7-link constructs, minus Lepage and Naik.
for(int mu=0;mu<Nd;mu++) {
// TODO: This approach is slightly memory inefficient. It uses 25% extra memory
Ughost_3link =Zero();
Ughost_5linkA=Zero();
Ughost_5linkB=Zero();
// Create the accessors
autoView(U_v , Ughost , AcceleratorRead);
autoView(U_fat_v , Ughost_fat , AcceleratorWrite);
autoView(U_3link_v , Ughost_3link , AcceleratorWrite);
autoView(U_5linkA_v, Ughost_5linkA, AcceleratorWrite);
autoView(U_5linkB_v, Ughost_5linkB, AcceleratorWrite);
// We infer some types that will be needed in the calculation.
typedef decltype(gStencil.GetEntry(0,0)) stencilElement;
typedef decltype(coalescedReadGeneralPermute(U_v[0](0),gStencil.GetEntry(0,0)->_permute,Nd)) U3matrix;
int Nsites = U_v.size();
auto gStencil_v = gStencil.View();
accelerator_for(site,Nsites,Simd::Nsimd(),{ // ----------- 3-link constructs
stencilElement SE0, SE1, SE2, SE3, SE4, SE5;
U3matrix U0, U1, U2, U3, U4, U5, W;
for(int nu=0;nu<Nd;nu++) {
if(nu==mu) continue;
int s = stencilIndex(mu,nu);
// The stencil gives us support points in the mu-nu plane that we will use to
// grab the links we need.
SE0 = gStencil_v.GetEntry(s+0,site); int x_p_mu = SE0->_offset;
SE1 = gStencil_v.GetEntry(s+1,site); int x_p_nu = SE1->_offset;
SE2 = gStencil_v.GetEntry(s+2,site); int x = SE2->_offset;
SE3 = gStencil_v.GetEntry(s+3,site); int x_p_mu_m_nu = SE3->_offset;
SE4 = gStencil_v.GetEntry(s+4,site); int x_m_nu = SE4->_offset;
SE5 = gStencil_v.GetEntry(s+5,site); int x_m_mu = SE5->_offset;
// When you're deciding whether to take an adjoint, the question is: how is the
// stored link oriented compared to the one you want? If I imagine myself travelling
// with the to-be-updated link, I have two possible, alternative 3-link paths I can
// take, one starting by going to the left, the other starting by going to the right.
U0 = coalescedReadGeneralPermute(U_v[x_p_mu ](nu),SE0->_permute,Nd);
U1 = coalescedReadGeneralPermute(U_v[x_p_nu ](mu),SE1->_permute,Nd);
U2 = coalescedReadGeneralPermute(U_v[x ](nu),SE2->_permute,Nd);
U3 = coalescedReadGeneralPermute(U_v[x_p_mu_m_nu](nu),SE3->_permute,Nd);
U4 = coalescedReadGeneralPermute(U_v[x_m_nu ](mu),SE4->_permute,Nd);
U5 = coalescedReadGeneralPermute(U_v[x_m_nu ](nu),SE4->_permute,Nd);
// "left" "right"
W = U2*U1*adj(U0) + adj(U5)*U4*U3;
// Save 3-link construct for later and add to smeared field.
coalescedWrite(U_3link_v[x](nu), W);
// The index operator (x) returns the coalesced read on GPU. The view [] index returns
// a reference to the vector object. The [x](mu) returns a reference to the densely
// packed (contiguous in memory) mu-th element of the vector object. On CPU,
// coalescedRead/Write is the identity mapping assigning vector object to vector object.
// But on GPU it's non-trivial and maps scalar object to vector object and vice versa.
coalescedWrite(U_fat_v[x](mu), U_fat_v(x)(mu) + lt.c_3*W);
}
})
accelerator_for(site,Nsites,Simd::Nsimd(),{ // ----------- 5-link
stencilElement SE0, SE1, SE2, SE3, SE4, SE5;
U3matrix U0, U1, U2, U3, U4, U5, W;
int sigmaIndex = 0;
for(int nu=0;nu<Nd;nu++) {
if(nu==mu) continue;
int s = stencilIndex(mu,nu);
for(int rho=0;rho<Nd;rho++) {
if (rho == mu || rho == nu) continue;
SE0 = gStencil_v.GetEntry(s+0,site); int x_p_mu = SE0->_offset;
SE1 = gStencil_v.GetEntry(s+1,site); int x_p_nu = SE1->_offset;
SE2 = gStencil_v.GetEntry(s+2,site); int x = SE2->_offset;
SE3 = gStencil_v.GetEntry(s+3,site); int x_p_mu_m_nu = SE3->_offset;
SE4 = gStencil_v.GetEntry(s+4,site); int x_m_nu = SE4->_offset;
U0 = coalescedReadGeneralPermute( U_v[x_p_mu ](nu ),SE0->_permute,Nd);
U1 = coalescedReadGeneralPermute(U_3link_v[x_p_nu ](rho),SE1->_permute,Nd);
U2 = coalescedReadGeneralPermute( U_v[x ](nu ),SE2->_permute,Nd);
U3 = coalescedReadGeneralPermute( U_v[x_p_mu_m_nu](nu ),SE3->_permute,Nd);
U4 = coalescedReadGeneralPermute(U_3link_v[x_m_nu ](rho),SE4->_permute,Nd);
U5 = coalescedReadGeneralPermute( U_v[x_m_nu ](nu ),SE4->_permute,Nd);
W = U2*U1*adj(U0) + adj(U5)*U4*U3;
if(sigmaIndex<3) {
coalescedWrite(U_5linkA_v[x](rho), W);
} else {
coalescedWrite(U_5linkB_v[x](rho), W);
}
coalescedWrite(U_fat_v[x](mu), U_fat_v(x)(mu) + lt.c_5*W);
sigmaIndex++;
}
}
})
accelerator_for(site,Nsites,Simd::Nsimd(),{ // ----------- 7-link
stencilElement SE0, SE1, SE2, SE3, SE4, SE5;
U3matrix U0, U1, U2, U3, U4, U5, W;
int sigmaIndex = 0;
for(int nu=0;nu<Nd;nu++) {
if(nu==mu) continue;
int s = stencilIndex(mu,nu);
for(int rho=0;rho<Nd;rho++) {
if (rho == mu || rho == nu) continue;
SE0 = gStencil_v.GetEntry(s+0,site); int x_p_mu = SE0->_offset;
SE1 = gStencil_v.GetEntry(s+1,site); int x_p_nu = SE1->_offset;
SE2 = gStencil_v.GetEntry(s+2,site); int x = SE2->_offset;
SE3 = gStencil_v.GetEntry(s+3,site); int x_p_mu_m_nu = SE3->_offset;
SE4 = gStencil_v.GetEntry(s+4,site); int x_m_nu = SE4->_offset;
U0 = coalescedReadGeneralPermute(U_v[x_p_mu](nu),SE0->_permute,Nd);
if(sigmaIndex<3) {
U1 = coalescedReadGeneralPermute(U_5linkB_v[x_p_nu](rho),SE1->_permute,Nd);
} else {
U1 = coalescedReadGeneralPermute(U_5linkA_v[x_p_nu](rho),SE1->_permute,Nd);
}
U2 = coalescedReadGeneralPermute(U_v[x](nu),SE2->_permute,Nd);
U3 = coalescedReadGeneralPermute(U_v[x_p_mu_m_nu](nu),SE3->_permute,Nd);
if(sigmaIndex<3) {
U4 = coalescedReadGeneralPermute(U_5linkB_v[x_m_nu](rho),SE4->_permute,Nd);
} else {
U4 = coalescedReadGeneralPermute(U_5linkA_v[x_m_nu](rho),SE4->_permute,Nd);
}
U5 = coalescedReadGeneralPermute(U_v[x_m_nu](nu),SE4->_permute,Nd);
W = U2*U1*adj(U0) + adj(U5)*U4*U3;
coalescedWrite(U_fat_v[x](mu), U_fat_v(x)(mu) + lt.c_7*W);
sigmaIndex++;
}
}
})
} // end mu loop
// c1, c3, c5, c7 construct contributions
u_smr = Ghost.Extract(Ughost_fat) + lt.c_1*u_thin;
// Load up U and V std::vectors to access thin and smeared links.
std::vector<LF> U(Nd, grid);
std::vector<LF> V(Nd, grid);
std::vector<LF> Vnaik(Nd, grid);
for (int mu = 0; mu < Nd; mu++) {
U[mu] = PeekIndex<LorentzIndex>(u_thin, mu);
V[mu] = PeekIndex<LorentzIndex>(u_smr, mu);
}
for(int mu=0;mu<Nd;mu++) {
// Naik
Vnaik[mu] = lt.c_naik*Gimpl::CovShiftForward(U[mu],mu,
Gimpl::CovShiftForward(U[mu],mu,
Gimpl::CovShiftIdentityForward(U[mu],mu)));
// LePage
for (int nu_h=1;nu_h<Nd;nu_h++) {
int nu=(mu+nu_h)%Nd;
// nu, nu, mu, Back(nu), Back(nu)
V[mu] = V[mu] + lt.c_lp*Gimpl::CovShiftForward(U[nu],nu,
Gimpl::CovShiftForward(U[nu],nu,
Gimpl::CovShiftForward(U[mu],mu,
Gimpl::CovShiftBackward(U[nu],nu,
Gimpl::CovShiftIdentityBackward(U[nu],nu)))))
// Back(nu), Back(nu), mu, nu, nu
+ lt.c_lp*Gimpl::CovShiftBackward(U[nu],nu,
Gimpl::CovShiftBackward(U[nu],nu,
Gimpl::CovShiftForward(U[mu],mu,
Gimpl::CovShiftForward(U[nu],nu,
Gimpl::CovShiftIdentityForward(U[nu],nu)))));
}
}
// Put V back into u_smr.
for (int mu = 0; mu < Nd; mu++) {
PokeIndex<LorentzIndex>(u_smr , V[mu] , mu);
PokeIndex<LorentzIndex>(u_naik, Vnaik[mu], mu);
}
};
// Intent: OUT--u_proj
// IN--u_mu
void projectU3(GF& u_proj, GF& u_mu) const {
auto grid = this->_grid;
LF V(grid), Q(grid), sqrtQinv(grid), id_3(grid), diff(grid);
CF c0(grid), c1(grid), c2(grid), g0(grid), g1(grid), g2(grid), S(grid), R(grid), theta(grid),
u(grid), v(grid), w(grid), den(grid), f0(grid), f1(grid), f2(grid);
// Follow MILC 10.1103/PhysRevD.82.074501, eqs (B2-B3) and (C1-C8)
for (int mu = 0; mu < Nd; mu++) {
V = PeekIndex<LorentzIndex>(u_mu, mu);
Q = adj(V)*V;
c0 = real(trace(Q));
c1 = (1/2.)*real(trace(Q*Q));
c2 = (1/3.)*real(trace(Q*Q*Q));
S = (1/3.)*c1-(1/18.)*c0*c0;
if (norm2(S)<1e-28) {
g0 = (1/3.)*c0; g1 = g0; g2 = g1;
} else {
R = (1/2.)*c2-(1/3. )*c0*c1+(1/27.)*c0*c0*c0;
theta = acos(R*pow(S,-1.5));
g0 = (1/3.)*c0+2.*sqrt(S)*cos((1/3.)*theta-2*M_PI/3.);
g1 = (1/3.)*c0+2.*sqrt(S)*cos((1/3.)*theta );
g2 = (1/3.)*c0+2.*sqrt(S)*cos((1/3.)*theta+2*M_PI/3.);
}
// if (fabs(Q.determinant()/(g0*g1*g2)-1.0) > 1e-5) { SVD }
u = sqrt(g0) + sqrt(g1) + sqrt(g2);
v = sqrt(g0*g1) + sqrt(g0*g2) + sqrt(g1*g2);
w = sqrt(g0*g1*g2);
den = w*(u*v-w);
f0 = (-w*(u*u+v)+u*v*v)/den;
f1 = (-w-u*u*u+2.*u*v)/den;
f2 = u/den;
id_3 = 1.;
sqrtQinv = f0*id_3 + f1*Q + f2*Q*Q;
PokeIndex<LorentzIndex>(u_proj, V*sqrtQinv, mu);
}
};
// void derivative(const GaugeField& Gauge) const {
// };
};
NAMESPACE_END(Grid);

1
Grid/qcd/smearing/Smearing.h
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@ -5,4 +5,5 @@
#include <Grid/qcd/smearing/StoutSmearing.h>
#include <Grid/qcd/smearing/GaugeConfiguration.h>
#include <Grid/qcd/smearing/WilsonFlow.h>
#include <Grid/qcd/smearing/HISQSmearing.h>

50
Grid/stencil/GeneralLocalStencil.h
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@ -137,5 +137,55 @@ public:
};
////////////////////////////////////////////////
// Some machinery to streamline making a stencil
////////////////////////////////////////////////
class shiftSignal {
public:
enum {
BACKWARD_CONST = 16,
NO_SHIFT = -1
};
};
// TODO: put a check somewhere that BACKWARD_CONST > Nd!
/*! @brief signals that you want to go backwards in direction dir */
inline int Back(const int dir) {
// generalShift will use BACKWARD_CONST to determine whether we step forward or
// backward. Trick inspired by SIMULATeQCD.
return dir + shiftSignal::BACKWARD_CONST;
}
/*! @brief shift one unit in direction dir */
template<typename... Args>
void generalShift(Coordinate& shift, int dir) {
if (dir >= shiftSignal::BACKWARD_CONST) {
dir -= shiftSignal::BACKWARD_CONST;
shift[dir]+=-1;
} else if (dir == shiftSignal::NO_SHIFT) {
; // do nothing
} else {
shift[dir]+=1;
}
}
/*! @brief follow a path of directions, shifting one unit in each direction */
template<typename... Args>
void generalShift(Coordinate& shift, int dir, Args... args) {
if (dir >= shiftSignal::BACKWARD_CONST) {
dir -= shiftSignal::BACKWARD_CONST;
shift[dir]+=-1;
} else if (dir == shiftSignal::NO_SHIFT) {
; // do nothing
} else {
shift[dir]+=1;
}
generalShift(shift, args...);
}
NAMESPACE_END(Grid);

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examples/Example_plaquette.cc Normal file
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/*
* Example_plaquette.cc
*
* D. Clarke
*
* Here I just want to create an incredibly simple main to get started with GRID and get used
* to its syntax. If the reader is like me, they vaguely understand something about lattice coding,
* they don't know a ton of C++, don't know much of the fine details, and certainly know nothing about GRID.
*
* Once you've made a new executable, like this one, you can bootstrap.sh again. At this point,
* the code should be able to find your new executable. You can tell that bootstrap.sh worked by
* having a look at Make.inc. You should see your executable inside there.
*
* Warning: This code illustrative only, not well tested, and not meant for production use. The best
* way to read this code is to start at the main.
*
*/
// All your mains should have this
#include <Grid/Grid.h>
using namespace Grid;
// This copies what already exists in WilsonLoops.h. The point here is to be pedagogical and explain in
// detail what everything does so we can see how GRID works.
template <class Gimpl> class WLoops : public Gimpl {
public:
// Gimpl seems to be an arbitrary class. Within this class, it is expected that certain types are
// already defined, things like Scalar and Field. This macro includes a bunch of #typedefs that
// implement this equivalence at compile time.
INHERIT_GIMPL_TYPES(Gimpl);
// Some example Gimpls can be found in GaugeImplementations.h, at the bottom. These are in turn built
// out of GaugeImplTypes, which can be found in GaugeImplTypes.h. The GaugeImplTypes contain the base
// field/vector/link/whatever types. These inherit from iScalar, iVector, and iMatrix objects, which
// are sort of the building blocks for gerenal math objects. The "i" at the beginning of these names
// indicates that they should be for internal use only. It seems like these base types have the
// acceleration, e.g. SIMD or GPU or what-have-you, abstracted away. How you accelerate these things
// appears to be controlled through a template parameter called vtype.
// The general math/physics objects, such as a color matrix, are built up by nesting these objects.
// For instance a general color matrix has two color indices, so it's built up like
// iScalar<iScalar<iMatrix<vtype ...
// where the levels going from the inside out are color, spin, then Lorentz indices. Scalars have
// no indices, so it's what we use when such an index isn't needed. Lattice objects are made by one
// higher level of indexing using iVector.
// These types will be used for U and U_mu objects, respectively.
typedef typename Gimpl::GaugeLinkField GaugeMat;
typedef typename Gimpl::GaugeField GaugeLorentz;
// U_mu_nu(x)
static void dirPlaquette(GaugeMat &plaq, const std::vector<GaugeMat> &U, const int mu, const int nu) {
// Calls like CovShiftForward and CovShiftBackward have 3 arguments, and they multiply together
// the first and last argument. (Second arg gives the shift direction.) The CovShiftIdentityBackward
// has meanwhile only two arguments; it just returns the shifted (adjoint since backward) link.
plaq = Gimpl::CovShiftForward(U[mu],mu,
// Means Link*Cshift(field,mu,1), arguments are Link, mu, field in that order.
Gimpl::CovShiftForward(U[nu],nu,
Gimpl::CovShiftBackward(U[mu],mu,
// This means Cshift(adj(Link), mu, -1)
Gimpl::CovShiftIdentityBackward(U[nu], nu))));
}
// tr U_mu_nu(x)
static void traceDirPlaquette(ComplexField &plaq, const std::vector<GaugeMat> &U, const int mu, const int nu) {
// This .Grid() syntax seems to get the pointer to the GridBase. Apparently this is needed as argument
// to instantiate a Lattice object.
GaugeMat sp(U[0].Grid());
dirPlaquette(sp, U, mu, nu);
plaq = trace(sp);
}
// sum_mu_nu tr U_mu_nu(x)
static void sitePlaquette(ComplexField &Plaq, const std::vector<GaugeMat> &U) {
ComplexField sitePlaq(U[0].Grid());
Plaq = Zero();
// Nd=4 and Nc=3 are set as global constants in QCD.h
for (int mu = 1; mu < Nd; mu++) {
for (int nu = 0; nu < mu; nu++) {
traceDirPlaquette(sitePlaq, U, mu, nu);
Plaq = Plaq + sitePlaq;
}
}
}
// sum_mu_nu_x Re tr U_mu_nu(x)
static RealD sumPlaquette(const GaugeLorentz &Umu) {
std::vector<GaugeMat> U(Nd, Umu.Grid());
for (int mu = 0; mu < Nd; mu++) {
// Umu is a GaugeLorentz object, and as such has a non-trivial Lorentz index. We can
// access the element in the mu Lorentz index with this PeekIndex syntax.
U[mu] = PeekIndex<LorentzIndex>(Umu, mu);
}
ComplexField Plaq(Umu.Grid());
sitePlaquette(Plaq, U);
// I guess this should be the line that sums over all space-time sites.
auto Tp = sum(Plaq);
// Until now, we have been working with objects inside the tensor nest. This TensorRemove gets
// rid of the tensor nest to return whatever is inside.
auto p = TensorRemove(Tp);
return p.real();
}
// < Re tr U_mu_nu(x) >
static RealD avgPlaquette(const GaugeLorentz &Umu) {
// Real double type
RealD sumplaq = sumPlaquette(Umu);
// gSites() is the number of global sites. there is also lSites() for local sites.
double vol = Umu.Grid()->gSites();
// The number of orientations. 4*3/2=6 for Nd=4, as known.
double faces = (1.0 * Nd * (Nd - 1)) / 2.0;
return sumplaq / vol / faces / Nc;
}
};
// Next we show an example of how to construct an input parameter class. We first inherit
// from Serializable. Then all class data members have to be defined using the
// GRID_SERIALIZABLE_CLASS_MEMBERS macro. This variadic macro allows for arbitrarily many
// class data members. In the below case, we make a parameter file holding the configuration
// name. Here, it expects the name to be labeled with "conf_name" in the configuration file.
struct ConfParameters: Serializable {
GRID_SERIALIZABLE_CLASS_MEMBERS(
ConfParameters,
std::string, conf_name);
template <class ReaderClass>
ConfParameters(Reader<ReaderClass>& Reader){
// If we are reading an XML file, it should be structured like:
// <grid>
// <parameters>
// <conf_name>l20t20b06498a_nersc.302500</conf_name>
// </parameters>
// </grid>
read(Reader, "parameters", *this);
}
};
// This syntax lets you pass command line arguments to main. An asterisk means that what follows is
// a pointer. Two asterisks means what follows is a pointer to an array.
int main (int argc, char **argv)
{
// This initializes Grid. Some command line options include
// --mpi n.n.n.n
// --threads n
// --grid n.n.n.n
Grid_init(&argc, &argv);
// This is where you would specify a custom lattice size, if not from the command line. Here
// Nd is a global quantity that is currently set to 4.
Coordinate simd_layout = GridDefaultSimd(Nd,vComplex::Nsimd());
Coordinate mpi_layout = GridDefaultMpi();
Coordinate latt_size = GridDefaultLatt();
// Instantiate the spacetime Grid on which everything will be built.
GridCartesian GRID(latt_size,simd_layout,mpi_layout);
// The PeriodicGimplD type is what you want for gauge matrices. There is also a LatticeGaugeFieldD
// type that you can use, which will work perfectly with what follows.
PeriodicGimplD::Field U(&GRID);
// Here we read in the parameter file params.json to get conf_name. The last argument is what the
// top organizational level is called in the param file.
XmlReader Reader("Example_plaquette.xml",false, "grid");
ConfParameters param(Reader);
// Load a lattice from SIMULATeQCD into U. SIMULATeQCD finds plaquette = 0.6381995717
FieldMetaData header;
NerscIO::readConfiguration(U, header, param.conf_name);
// Let's see what we find.
RealD plaq = WLoops<PeriodicGimplD>::avgPlaquette(U);
// This is how you make log messages.
std::cout << GridLogMessage << std::setprecision(std::numeric_limits<Real>::digits10 + 1) << "Plaquette = " << plaq << std::endl;
// To wrap things up.
Grid_finalize();
}

42
tests/debug/Test_padded_cell.cc
View File

@ -32,6 +32,7 @@ Author: Peter Boyle <paboyle@ph.ed.ac.uk>
using namespace std;
using namespace Grid;
// This is to optimize the SIMD
template<class vobj> void gpermute(vobj & inout,int perm){
vobj tmp=inout;
if (perm & 0x1 ) { permute(inout,tmp,0); tmp=inout;}
@ -40,6 +41,7 @@ template<class vobj> void gpermute(vobj & inout,int perm){
if (perm & 0x8 ) { permute(inout,tmp,3); tmp=inout;}
}
int main (int argc, char ** argv)
{
Grid_init(&argc,&argv);
@ -47,20 +49,21 @@ int main (int argc, char ** argv)
Coordinate latt_size = GridDefaultLatt();
Coordinate simd_layout= GridDefaultSimd(Nd,vComplexD::Nsimd());
Coordinate mpi_layout = GridDefaultMpi();
std::cout << " mpi "<<mpi_layout<<std::endl;
std::cout << " simd "<<simd_layout<<std::endl;
std::cout << " latt "<<latt_size<<std::endl;
std::cout << GridLogMessage << " mpi "<<mpi_layout<<std::endl;
std::cout << GridLogMessage << " simd "<<simd_layout<<std::endl;
std::cout << GridLogMessage << " latt "<<latt_size<<std::endl;
GridCartesian GRID(latt_size,simd_layout,mpi_layout);
// Initialize configuration as hot start.
GridParallelRNG pRNG(&GRID);
pRNG.SeedFixedIntegers(std::vector<int>({45,12,81,9}));
LatticeGaugeField Umu(&GRID);
pRNG.SeedFixedIntegers(std::vector<int>({45,12,81,9}));
SU<Nc>::HotConfiguration(pRNG,Umu);
Real plaq=WilsonLoops<PeriodicGimplR>::avgPlaquette(Umu);
LatticeComplex trplaq(&GRID);
// Store Umu in U. Peek/Poke mean respectively getElement/setElement.
std::vector<LatticeColourMatrix> U(Nd, Umu.Grid());
for (int mu = 0; mu < Nd; mu++) {
U[mu] = PeekIndex<LorentzIndex>(Umu, mu);
@ -70,9 +73,7 @@ int main (int argc, char ** argv)
LatticeComplex cplaq(&GRID); cplaq=Zero();
/////////////////////////////////////////////////
// Create a padded cell of extra padding depth=1
/////////////////////////////////////////////////
int depth = 1;
PaddedCell Ghost(depth,&GRID);
LatticeGaugeField Ughost = Ghost.Exchange(Umu);
@ -114,18 +115,25 @@ int main (int argc, char ** argv)
}
#endif
///// Array for the site plaquette
// Array for the site plaquette
GridBase *GhostGrid = Ughost.Grid();
LatticeComplex gplaq(GhostGrid);
// Now we're going to put together the "stencil" that will be useful to us when
// calculating the plaquette. Our eventual goal is to make the product
// Umu(x) Unu(x+mu) Umu^dag(x+nu) Unu^dag(x),
// which requires, in order, the sites x, x+mu, x+nu, and x. We arrive at these
// sites relative to x through "shifts", which is represented here by a 4-d
// vector of 0s (no movement) and 1s (shift one unit) at each site. The
// "stencil" is the set of all these shifts.
std::vector<Coordinate> shifts;
for(int mu=0;mu<Nd;mu++){
for(int nu=mu+1;nu<Nd;nu++){
// Umu(x) Unu(x+mu) Umu^dag(x+nu) Unu^dag(x)
Coordinate shift_0(Nd,0);
Coordinate shift_mu(Nd,0); shift_mu[mu]=1;
Coordinate shift_nu(Nd,0); shift_nu[nu]=1;
// push_back creates an element at the end of shifts and
// assigns the data in the argument to it.
shifts.push_back(shift_0);
shifts.push_back(shift_mu);
shifts.push_back(shift_nu);
@ -135,10 +143,15 @@ int main (int argc, char ** argv)
GeneralLocalStencil gStencil(GhostGrid,shifts);
gplaq=Zero();
{
// Before doing accelerator stuff, there is an opening and closing of "Views". I guess the
// "Views" are stored in *_v variables listed below.
autoView( gp_v , gplaq, CpuWrite);
autoView( t_v , trplaq, CpuRead);
autoView( U_v , Ughost, CpuRead);
// This is now a loop over stencil shift elements. That is, s increases as we make our
// way through the spacetimes sites, but also as we make our way around the plaquette.
for(int ss=0;ss<gp_v.size();ss++){
int s=0;
for(int mu=0;mu<Nd;mu++){
@ -149,6 +162,7 @@ int main (int argc, char ** argv)
auto SE2 = gStencil.GetEntry(s+2,ss);
auto SE3 = gStencil.GetEntry(s+3,ss);
// Due to our strategy, each offset corresponds to a site.
int o0 = SE0->_offset;
int o1 = SE1->_offset;
int o2 = SE2->_offset;
@ -169,7 +183,11 @@ int main (int argc, char ** argv)
}
}
}
}
// Here is my understanding of this part: The padded cell has its own periodic BCs, so
// if I take a step to the right at the right-most side of the cell, I end up on the
// left-most side. This means that the plaquettes in the padding are wrong. Luckily
// all we care about are the plaquettes in the cell, which we obtain from Extract.
cplaq = Ghost.Extract(gplaq);
RealD vol = cplaq.Grid()->gSites();
RealD faces = (Nd * (Nd-1))/2;

181
tests/smearing/Test_fatLinks.cc Normal file
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@ -0,0 +1,181 @@
/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./tests/smearing/Test_fatLinks.cc
Copyright (C) 2023
Author: D. A. Clarke <clarke.davida@gmail.com>
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
*************************************************************************************/
/*
@file Test_fatLinks.cc
@brief test of the HISQ smearing
*/
#include <Grid/Grid.h>
#include <Grid/lattice/PaddedCell.h>
#include <Grid/stencil/GeneralLocalStencil.h>
#include <Grid/qcd/smearing/HISQSmearing.h>
using namespace Grid;
/*! @brief parameter file to easily adjust Nloop */
struct ConfParameters: Serializable {
GRID_SERIALIZABLE_CLASS_MEMBERS(
ConfParameters,
int, benchmark,
int, Nloop);
template <class ReaderClass>
ConfParameters(Reader<ReaderClass>& Reader){
read(Reader, "parameters", *this);
}
};
bool testSmear(GridCartesian& GRID, LatticeGaugeFieldD Umu, LatticeGaugeFieldD Usmr, LatticeGaugeFieldD Unaik,
LatticeGaugeFieldD Ucontrol, Real c1, Real cnaik, Real c3, Real c5, Real c7, Real clp) {
Smear_HISQ<PeriodicGimplD> hisq_fat(&GRID,c1,cnaik,c3,c5,c7,clp);
LatticeGaugeFieldD diff(&GRID), Uproj(&GRID);
hisq_fat.smear(Usmr, Unaik, Umu);
bool result;
if (cnaik < 1e-30) { // Testing anything but Naik term
diff = Ucontrol-Usmr;
auto absDiff = norm2(diff)/norm2(Ucontrol);
if (absDiff < 1e-30) {
Grid_pass(" |Umu-Usmr|/|Umu| = ",absDiff);
result = true;
} else {
Grid_error(" |Umu-Usmr|/|Umu| = ",absDiff);
result = false;
}
} else { // Testing Naik specifically
diff = Ucontrol-Unaik;
auto absDiff = norm2(diff)/norm2(Ucontrol);
if (absDiff < 1e-30) {
Grid_pass(" |Umu-Unaik|/|Umu| = ",absDiff);
result = true;
} else {
Grid_error(" |Umu-Unaik|/|Umu| = ",absDiff);
result = false;
}
hisq_fat.projectU3(Uproj,Ucontrol);
// NerscIO::writeConfiguration(Unaik,"nersc.l8t4b3360.naik");
}
return result;
}
int main (int argc, char** argv) {
// Params for the test.
int Ns = 8;
int Nt = 4;
Coordinate latt_size(Nd,0); latt_size[0]=Ns; latt_size[1]=Ns; latt_size[2]=Ns; latt_size[3]=Nt;
std::string conf_in = "nersc.l8t4b3360";
int threads = GridThread::GetThreads();
typedef LatticeGaugeFieldD LGF;
// Initialize the Grid
Grid_init(&argc,&argv);
Coordinate simd_layout = GridDefaultSimd(Nd,vComplexD::Nsimd());
Coordinate mpi_layout = GridDefaultMpi();
Grid_log("mpi = ",mpi_layout);
Grid_log("simd = ",simd_layout);
Grid_log("latt = ",latt_size);
Grid_log("threads = ",threads);
GridCartesian GRID(latt_size,simd_layout,mpi_layout);
XmlReader Reader("fatParams.xml",false,"grid");
ConfParameters param(Reader);
if(param.benchmark) Grid_log(" Nloop = ",param.Nloop);
LGF Umu(&GRID), Usmr(&GRID), Unaik(&GRID), Ucontrol(&GRID);
// Read the configuration into Umu
FieldMetaData header;
NerscIO::readConfiguration(Umu, header, conf_in);
bool pass=true;
// Carry out various tests
NerscIO::readConfiguration(Ucontrol, header, "nersc.l8t4b3360.357lplink.control");
pass *= testSmear(GRID,Umu,Usmr,Unaik,Ucontrol,1/8.,0.,1/16.,1/64.,1/384.,-1/8.);
NerscIO::readConfiguration(Ucontrol, header, "nersc.l8t4b3360.357link.control");
pass *= testSmear(GRID,Umu,Usmr,Unaik,Ucontrol,1/8.,0.,1/16.,1/64.,1/384.,0.);
NerscIO::readConfiguration(Ucontrol, header, "nersc.l8t4b3360.35link.control");
pass *= testSmear(GRID,Umu,Usmr,Unaik,Ucontrol,1/8.,0.,1/16.,1/64.,0.,0.);
NerscIO::readConfiguration(Ucontrol, header, "nersc.l8t4b3360.3link.control");
pass *= testSmear(GRID,Umu,Usmr,Unaik,Ucontrol,1/8.,0.,1/16.,0.,0.,0.);
NerscIO::readConfiguration(Ucontrol, header, "nersc.l8t4b3360.naik.control");
pass *= testSmear(GRID,Umu,Usmr,Unaik,Ucontrol,0.,0.8675309,0.,0.,0.,0.);
if(pass){
Grid_pass("All tests passed.");
} else {
Grid_error("At least one test failed.");
}
// Test a C-style instantiation
double path_coeff[6] = {1, 2, 3, 4, 5, 6};
Smear_HISQ<PeriodicGimplD> hisq_fat_Cstyle(&GRID,path_coeff);
if (param.benchmark) {
autoView(U_v, Umu, CpuRead); // Gauge accessor
// Read in lattice sequentially, Nloop times
double lookupTime = 0.;
for(int i=0;i<param.Nloop;i++) {
double start = usecond();
for(int ss=0;ss<U_v.size();ss++)
for(int mu=0;mu<Nd;mu++) {
auto U1 = U_v[ss](mu);
}
double stop = usecond();
lookupTime += stop-start; // microseconds
}
Grid_log("Time to lookup: ",lookupTime,"[ms]");
// Raise a matrix to the power nmat, for each link.
auto U1 = U_v[0](0);
for(int nmat=1;nmat<8;nmat++) {
double multTime = 0.;
for(int i=0;i<param.Nloop;i++) {
double start=usecond();
for(int ss=0;ss<U_v.size();ss++)
for(int mu=0;mu<Nd;mu++) {
auto U2 = U1;
for(int j=1;j<nmat;j++) {
U2 *= U1;
}
}
double stop=usecond();
multTime += stop-start;
}
Grid_log("Time to multiply ",nmat," matrices: ",multTime," [ms]");
}
}
Grid_finalize();
}