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126 lines
4.1 KiB
C++
126 lines
4.1 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./benchmarks/Benchmark_su3mult_vs_lookup.cc
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Copyright (C) 2023
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Author: D. A. Clarke <clarke.davida@gmail.com>
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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 directory
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*************************************************************************************/
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/*
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@file Benchmark_su3mult_vs_lookup.cc
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@brief check to see whether su3 multiplication or lookup tables is faster
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*/
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#include <Grid/Grid.h>
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using namespace Grid;
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/*! @brief make the logger work like python print */
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template<typename... Args>
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inline std::string sjoin(Args&&... args) noexcept {
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std::ostringstream msg;
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(msg << ... << args);
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return msg.str();
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}
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template <typename... Args>
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inline void Grid_log(Args&&... args) {
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std::string msg = sjoin(std::forward<Args>(args)...);
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std::cout << GridLogMessage << msg << std::endl;
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}
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/*! @brief parameter file to easily adjust Nloop */
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struct ConfParameters: Serializable {
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GRID_SERIALIZABLE_CLASS_MEMBERS(
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ConfParameters,
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int, Nloop);
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template <class ReaderClass>
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ConfParameters(Reader<ReaderClass>& Reader){
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read(Reader, "parameters", *this);
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}
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};
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int main (int argc, char** argv) {
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// Params for the test.
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int Ns = 8;
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int Nt = 4;
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int threads = GridThread::GetThreads();
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std::string conf_in = "nersc.l8t4b3360";
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Coordinate latt_size(Nd,0); latt_size[0]=Ns; latt_size[1]=Ns; latt_size[2]=Ns; latt_size[3]=Nt;
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Grid_init(&argc,&argv);
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Coordinate simd_layout = GridDefaultSimd(Nd,vComplexD::Nsimd());
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Coordinate mpi_layout = GridDefaultMpi();
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GridCartesian GRID(latt_size,simd_layout,mpi_layout);
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Grid_log(" mpi = ",mpi_layout);
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Grid_log(" simd = ",simd_layout);
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Grid_log(" latt = ",latt_size);
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Grid_log("threads = ",threads);
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XmlReader Reader("mult_vs_lookup.xml",false, "grid");
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ConfParameters param(Reader);
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Grid_log(" Nloop = ",param.Nloop);
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// Gauge field and accessor
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LatticeGaugeField Umu(&GRID);
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autoView(U_v, Umu, CpuRead);
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// Read the configuration into Umu
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FieldMetaData header;
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NerscIO::readConfiguration(Umu, header, conf_in);
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// Read in lattice sequentially, Nloop times
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double lookupTime = 0.;
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for(int i=0;i<param.Nloop;i++) {
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double start = usecond();
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for(int ss=0;ss<U_v.size();ss++)
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for(int mu=0;mu<Nd;mu++) {
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auto U1 = U_v[ss](mu);
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}
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double stop = usecond();
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lookupTime += stop-start; // microseconds
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}
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Grid_log("Time to lookup: ",lookupTime,"[ms]");
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// Raise a matrix to the power nmat, for each link.
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auto U1 = U_v[0](0);
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for(int nmat=1;nmat<8;nmat++) {
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double multTime = 0.;
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for(int i=0;i<param.Nloop;i++) {
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double start=usecond();
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for(int ss=0;ss<U_v.size();ss++)
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for(int mu=0;mu<Nd;mu++) {
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auto U2 = U1;
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for(int j=1;j<nmat;j++) {
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U2 *= U1;
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}
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}
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double stop=usecond();
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multTime += stop-start;
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}
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Grid_log("Time to multiply ",nmat," matrices: ",lookupTime," [ms]");
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}
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Grid_finalize();
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}
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