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112 lines
3.8 KiB
C++
112 lines
3.8 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./benchmarks/Benchmark_memory_asynch.cc
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Copyright (C) 2015
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Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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Author: paboyle <paboyle@ph.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 directory
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*************************************************************************************/
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/* END LEGAL */
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#include <Grid/Grid.h>
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using namespace std;
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using namespace Grid;
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using namespace Grid::QCD;
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int main (int argc, char ** argv)
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{
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Grid_init(&argc,&argv);
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const int Nvec=8;
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typedef Lattice< iVector< vReal,Nvec> > LatticeVec;
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typedef iVector<vReal,Nvec> Vec;
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std::vector<int> simd_layout = GridDefaultSimd(Nd,vReal::Nsimd());
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std::vector<int> mpi_layout = GridDefaultMpi();
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int threads = GridThread::GetThreads();
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std::cout<<GridLogMessage << "Grid is setup to use "<<threads<<" threads"<<std::endl;
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std::cout<<GridLogMessage << "===================================================================================================="<<std::endl;
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std::cout<<GridLogMessage << "= Benchmarking READ bandwidth"<<std::endl;
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std::cout<<GridLogMessage << "===================================================================================================="<<std::endl;
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std::cout<<GridLogMessage << " L "<<"\t\t"<<"bytes"<<"\t\t"<<"bytes/thread"<<"\t\t\t"<<"GB/s"<<"\t\t\t"<<"GB/s per thread"<<std::endl;
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std::cout<<GridLogMessage << "----------------------------------------------------------"<<std::endl;
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const int lmax = 16536*16;
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for(int lat=4;lat<=lmax;lat*=2){
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int Nloop=lmax*4/lat;
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std::vector<int> latt_size ({2*mpi_layout[0],2*mpi_layout[1],4*mpi_layout[2],lat*mpi_layout[3]});
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GridCartesian Grid(latt_size,simd_layout,mpi_layout);
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int vol = latt_size[0]*latt_size[1]*latt_size[2]*latt_size[3]*threads;
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Vec tsum; tsum = zero;
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GridParallelRNG pRNG(&Grid); pRNG.SeedRandomDevice();
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std::vector<double> stop(threads);
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Vector<Vec> sum(threads);
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std::vector<LatticeVec> x(threads,&Grid);
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for(int t=0;t<threads;t++){
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// random(pRNG,x[t]);
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}
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double start=usecond();
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parallel_for(int t=0;t<threads;t++){
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sum[t] = x[t]._odata[0];
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for(int i=0;i<Nloop;i++){
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for(auto ss=x[t].begin();ss<x[t].end();ss++){
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sum[t] = sum[t]+x[t]._odata[ss];
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}
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}
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stop[t]=usecond();
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}
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double max_stop=stop[0];
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double min_stop=stop[0];
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for(int t=0;t<threads;t++){
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tsum+=sum[t];
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if ( stop[t]<min_stop ) min_stop=stop[t];
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if ( stop[t]>max_stop ) max_stop=stop[t];
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}
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double max_time = (max_stop-start)/Nloop*1000;
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double min_time = (min_stop-start)/Nloop*1000;
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double bytes=vol*Nvec*sizeof(Real);
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std::cout<<GridLogMessage<<std::setprecision(3) << lat<<"\t\t"<<bytes<<"\t\t"<<bytes/threads<<"\t\t"<<bytes/max_time<<" - "<< bytes/min_time<<"\t\t"<<bytes/min_time/threads <<std::endl;
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}
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Grid_finalize();
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}
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