mirror of
https://github.com/paboyle/Grid.git
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198 lines
8.3 KiB
C++
198 lines
8.3 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./benchmarks/Benchmark_memory_bandwidth.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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Vec rn = zero;
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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 fused AXPY bandwidth ; sizeof(Real) "<<sizeof(Real)<<std::endl;
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std::cout<<GridLogMessage << "===================================================================================================="<<std::endl;
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std::cout<<GridLogMessage << " L "<<"\t\t"<<"bytes"<<"\t\t\t"<<"GB/s"<<"\t\t"<<"Gflop/s"<<"\t\t seconds"<<std::endl;
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std::cout<<GridLogMessage << "----------------------------------------------------------"<<std::endl;
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uint64_t lmax=64;
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#define NLOOP (10*lmax*lmax*lmax*lmax/vol)
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for(int lat=8;lat<=lmax;lat+=8){
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std::vector<int> latt_size ({lat*mpi_layout[0],lat*mpi_layout[1],lat*mpi_layout[2],lat*mpi_layout[3]});
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int64_t vol= latt_size[0]*latt_size[1]*latt_size[2]*latt_size[3];
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GridCartesian Grid(latt_size,simd_layout,mpi_layout);
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uint64_t Nloop=NLOOP;
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// GridParallelRNG pRNG(&Grid); pRNG.SeedFixedIntegers(std::vector<int>({45,12,81,9}));
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LatticeVec z(&Grid);// random(pRNG,z);
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LatticeVec x(&Grid);// random(pRNG,x);
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LatticeVec y(&Grid);// random(pRNG,y);
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double a=2.0;
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double start=usecond();
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for(int i=0;i<Nloop;i++){
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axpy(z,a,x,y);
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x._odata[0]=z._odata[0]; // serial loop dependence to prevent optimise
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y._odata[4]=z._odata[4];
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}
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double stop=usecond();
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double time = (stop-start)/Nloop*1000;
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double flops=vol*Nvec*2;// mul,add
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double bytes=3.0*vol*Nvec*sizeof(Real);
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std::cout<<GridLogMessage<<std::setprecision(3) << lat<<"\t\t"<<bytes<<" \t\t"<<bytes/time<<"\t\t"<<flops/time<<"\t\t"<<(stop-start)/1000./1000.<<std::endl;
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}
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std::cout<<GridLogMessage << "===================================================================================================="<<std::endl;
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std::cout<<GridLogMessage << "= Benchmarking a*x + y 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\t"<<"GB/s"<<"\t\t"<<"Gflop/s"<<"\t\t seconds"<<std::endl;
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std::cout<<GridLogMessage << "----------------------------------------------------------"<<std::endl;
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for(int lat=8;lat<=lmax;lat+=8){
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std::vector<int> latt_size ({lat*mpi_layout[0],lat*mpi_layout[1],lat*mpi_layout[2],lat*mpi_layout[3]});
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int64_t vol= latt_size[0]*latt_size[1]*latt_size[2]*latt_size[3];
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GridCartesian Grid(latt_size,simd_layout,mpi_layout);
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// GridParallelRNG pRNG(&Grid); pRNG.SeedFixedIntegers(std::vector<int>({45,12,81,9}));
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LatticeVec z(&Grid);// random(pRNG,z);
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LatticeVec x(&Grid);// random(pRNG,x);
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LatticeVec y(&Grid);// random(pRNG,y);
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double a=2.0;
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uint64_t Nloop=NLOOP;
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double start=usecond();
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for(int i=0;i<Nloop;i++){
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z=a*x-y;
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x._odata[0]=z._odata[0]; // force serial dependency to prevent optimise away
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y._odata[4]=z._odata[4];
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}
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double stop=usecond();
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double time = (stop-start)/Nloop*1000;
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double flops=vol*Nvec*2;// mul,add
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double bytes=3.0*vol*Nvec*sizeof(Real);
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std::cout<<GridLogMessage<<std::setprecision(3) << lat<<"\t\t"<<bytes<<" \t\t"<<bytes/time<<"\t\t"<<flops/time<<"\t\t"<<(stop-start)/1000./1000.<<std::endl;
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}
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std::cout<<GridLogMessage << "===================================================================================================="<<std::endl;
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std::cout<<GridLogMessage << "= Benchmarking SCALE 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\t"<<"GB/s"<<"\t\t"<<"Gflop/s"<<"\t\t seconds"<<std::endl;
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for(int lat=8;lat<=lmax;lat+=8){
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std::vector<int> latt_size ({lat*mpi_layout[0],lat*mpi_layout[1],lat*mpi_layout[2],lat*mpi_layout[3]});
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int64_t vol= latt_size[0]*latt_size[1]*latt_size[2]*latt_size[3];
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uint64_t Nloop=NLOOP;
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GridCartesian Grid(latt_size,simd_layout,mpi_layout);
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// GridParallelRNG pRNG(&Grid); pRNG.SeedFixedIntegers(std::vector<int>({45,12,81,9}));
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LatticeVec z(&Grid);// random(pRNG,z);
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LatticeVec x(&Grid);// random(pRNG,x);
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LatticeVec y(&Grid);// random(pRNG,y);
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RealD a=2.0;
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double start=usecond();
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for(int i=0;i<Nloop;i++){
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z=a*x;
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x._odata[0]=z._odata[0]*2.0;
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}
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double stop=usecond();
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double time = (stop-start)/Nloop*1000;
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double bytes=2.0*vol*Nvec*sizeof(Real);
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double flops=vol*Nvec*1;// mul
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std::cout<<GridLogMessage <<std::setprecision(3) << lat<<"\t\t"<<bytes<<" \t\t"<<bytes/time<<"\t\t"<<flops/time<<"\t\t"<<(stop-start)/1000./1000.<<std::endl;
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}
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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\t"<<"GB/s"<<"\t\t"<<"Gflop/s"<<"\t\t seconds"<<std::endl;
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std::cout<<GridLogMessage << "----------------------------------------------------------"<<std::endl;
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for(int lat=8;lat<=lmax;lat+=8){
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std::vector<int> latt_size ({lat*mpi_layout[0],lat*mpi_layout[1],lat*mpi_layout[2],lat*mpi_layout[3]});
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int64_t vol= latt_size[0]*latt_size[1]*latt_size[2]*latt_size[3];
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uint64_t Nloop=NLOOP;
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GridCartesian Grid(latt_size,simd_layout,mpi_layout);
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// GridParallelRNG pRNG(&Grid); pRNG.SeedFixedIntegers(std::vector<int>({45,12,81,9}));
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LatticeVec z(&Grid);// random(pRNG,z);
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LatticeVec x(&Grid);// random(pRNG,x);
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LatticeVec y(&Grid);// random(pRNG,y);
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RealD a=2.0;
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Real nn;
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double start=usecond();
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for(int i=0;i<Nloop;i++){
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nn=norm2(x);
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vsplat(x._odata[0]._internal[0],nn);
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}
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double stop=usecond();
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double time = (stop-start)/Nloop*1000;
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double bytes=1.0*vol*Nvec*sizeof(Real);
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double flops=vol*Nvec*2;// mul,add
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std::cout<<GridLogMessage<<std::setprecision(3) << lat<<"\t\t"<<bytes<<" \t\t"<<bytes/time<<"\t\t"<<flops/time<< "\t\t"<<(stop-start)/1000./1000.<< "\t\t " <<std::endl;
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}
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Grid_finalize();
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}
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