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209 lines
6.8 KiB
C++
209 lines
6.8 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./lib/qcd/action/gauge/WilsonGaugeAction.h
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Copyright (C) 2015
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Author: Guido Cossu <guido,cossu@ed.ac.uk>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution
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directory
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*************************************************************************************/
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/* END LEGAL */
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#ifndef SCALAR_INT_ACTION_H
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#define SCALAR_INT_ACTION_H
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// Note: this action can completely absorb the ScalarAction for real float fields
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// use the scalarObjs to generalise the structure
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namespace Grid
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{
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// FIXME drop the QCD namespace everywhere here
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template <class Impl, int Ndim>
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class ScalarInteractionAction : public QCD::Action<typename Impl::Field>
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{
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public:
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INHERIT_FIELD_TYPES(Impl);
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private:
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RealD mass_square;
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RealD lambda;
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RealD g;
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const unsigned int N = Impl::Group::Dimension;
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typedef typename Field::vector_object vobj;
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typedef CartesianStencil<vobj, vobj> Stencil;
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SimpleCompressor<vobj> compressor;
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int npoint = 2 * Ndim;
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std::vector<int> directions; //
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std::vector<int> displacements; //
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public:
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ScalarInteractionAction(RealD ms, RealD l, RealD gval) : mass_square(ms), lambda(l), g(gval), displacements(2 * Ndim, 0), directions(2 * Ndim, 0)
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{
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for (int mu = 0; mu < Ndim; mu++)
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{
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directions[mu] = mu;
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directions[mu + Ndim] = mu;
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displacements[mu] = 1;
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displacements[mu + Ndim] = -1;
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}
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}
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virtual std::string LogParameters()
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{
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std::stringstream sstream;
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sstream << GridLogMessage << "[ScalarAction] lambda : " << lambda << std::endl;
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sstream << GridLogMessage << "[ScalarAction] mass_square : " << mass_square << std::endl;
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sstream << GridLogMessage << "[ScalarAction] g : " << g << std::endl;
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return sstream.str();
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}
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virtual std::string action_name() { return "ScalarAction"; }
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virtual void refresh(const Field &U, GridParallelRNG &pRNG) {}
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virtual RealD S(const Field &p)
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{
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assert(p._grid->Nd() == Ndim);
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static Stencil phiStencil(p._grid, npoint, 0, directions, displacements);
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phiStencil.HaloExchange(p, compressor);
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Field action(p._grid), pshift(p._grid), phisquared(p._grid);
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phisquared = p * p;
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action = (2.0 * Ndim + mass_square) * phisquared - lambda * phisquared * phisquared;
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for (int mu = 0; mu < Ndim; mu++)
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{
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// pshift = Cshift(p, mu, +1); // not efficient, implement with stencils
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parallel_for(int i = 0; i < p._grid->oSites(); i++)
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{
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int permute_type;
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StencilEntry *SE;
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vobj temp2;
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const vobj *temp, *t_p;
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SE = phiStencil.GetEntry(permute_type, mu, i);
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t_p = &p._odata[i];
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if (SE->_is_local)
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{
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temp = &p._odata[SE->_offset];
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if (SE->_permute)
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{
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permute(temp2, *temp, permute_type);
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action._odata[i] -= temp2 * (*t_p) + (*t_p) * temp2;
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}
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else
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{
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action._odata[i] -= (*temp) * (*t_p) + (*t_p) * (*temp);
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}
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}
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else
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{
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action._odata[i] -= phiStencil.CommBuf()[SE->_offset] * (*t_p) + (*t_p) * phiStencil.CommBuf()[SE->_offset];
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}
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}
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// action -= pshift*p + p*pshift;
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}
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// NB the trace in the algebra is normalised to 1/2
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// minus sign coming from the antihermitian fields
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return -(TensorRemove(sum(trace(action)))).real() * N / g;
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};
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virtual void deriv(const Field &p, Field &force)
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{
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double t0 = usecond();
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assert(p._grid->Nd() == Ndim);
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force = (2. * Ndim + mass_square) * p - 2. * lambda * p * p * p;
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double interm_t = usecond();
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// move this outside
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static Stencil phiStencil(p._grid, npoint, 0, directions, displacements);
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phiStencil.HaloExchange(p, compressor);
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double halo_t = usecond();
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int chunk = 128;
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//for (int mu = 0; mu < QCD::Nd; mu++) force -= Cshift(p, mu, -1) + Cshift(p, mu, 1);
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// inverting the order of the loops slows down the code(! g++ 7)
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// cannot try to reduce the number of force writes by factor npoint...
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// use cache blocking
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for (int point = 0; point < npoint; point++)
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{
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#pragma omp parallel
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{
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int permute_type;
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StencilEntry *SE;
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const vobj *temp;
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#pragma omp for schedule(static, chunk)
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for (int i = 0; i < p._grid->oSites(); i++)
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{
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SE = phiStencil.GetEntry(permute_type, point, i);
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// prefetch next p?
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if (SE->_is_local)
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{
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temp = &p._odata[SE->_offset];
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if (SE->_permute)
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{
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vobj temp2;
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permute(temp2, *temp, permute_type);
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force._odata[i] -= temp2;
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}
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else
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{
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force._odata[i] -= *temp; // slow part. Dominated by this read/write (BW)
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}
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}
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else
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{
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force._odata[i] -= phiStencil.CommBuf()[SE->_offset];
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}
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}
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}
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}
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force *= N / g;
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double t1 = usecond();
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double total_time = (t1 - t0) / 1e6;
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double interm_time = (interm_t - t0) / 1e6;
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double halo_time = (halo_t - interm_t) / 1e6;
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double stencil_time = (t1 - halo_t) / 1e6;
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std::cout << GridLogIntegrator << "Total time for force computation (s) : " << total_time << std::endl;
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std::cout << GridLogIntegrator << "Intermediate time for force computation (s): " << interm_time << std::endl;
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std::cout << GridLogIntegrator << "Halo time in force computation (s) : " << halo_time << std::endl;
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std::cout << GridLogIntegrator << "Stencil time in force computation (s) : " << stencil_time << std::endl;
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double flops = p._grid->gSites() * (14 * N * N * N + 18 * N * N + 2);
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double flops_no_stencil = p._grid->gSites() * (14 * N * N * N + 6 * N * N + 2);
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double Gflops = flops / (total_time * 1e9);
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double Gflops_no_stencil = flops_no_stencil / (interm_time * 1e9);
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std::cout << GridLogIntegrator << "Flops: " << flops << " - Gflop/s : " << Gflops << std::endl;
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std::cout << GridLogIntegrator << "Flops NS: " << flops_no_stencil << " - Gflop/s NS: " << Gflops_no_stencil << std::endl;
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}
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};
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} // namespace Grid
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#endif // SCALAR_INT_ACTION_H
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