mirror of
https://github.com/paboyle/Grid.git
synced 2024-09-20 09:15:38 +01:00
85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
#include <Grid.h>
|
|
|
|
using namespace std;
|
|
using namespace Grid;
|
|
using namespace Grid::QCD;
|
|
|
|
int main (int argc, char ** argv)
|
|
{
|
|
Grid_init(&argc,&argv);
|
|
|
|
const int Nvec=4;
|
|
typedef Lattice< iVector< vReal,Nvec> > LatticeVec;
|
|
typedef iVector<vReal,Nvec> Vec;
|
|
|
|
|
|
std::vector<int> simd_layout = GridDefaultSimd(Nd,vReal::Nsimd());
|
|
std::vector<int> mpi_layout = GridDefaultMpi();
|
|
|
|
int threads = GridThread::GetThreads();
|
|
std::cout<<GridLogMessage << "Grid is setup to use "<<threads<<" threads"<<std::endl;
|
|
|
|
std::cout<<GridLogMessage << "===================================================================================================="<<std::endl;
|
|
std::cout<<GridLogMessage << "= Benchmarking READ bandwidth"<<std::endl;
|
|
std::cout<<GridLogMessage << "===================================================================================================="<<std::endl;
|
|
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;
|
|
std::cout<<GridLogMessage << "----------------------------------------------------------"<<std::endl;
|
|
|
|
const int lmax = 16536*16;
|
|
for(int lat=4;lat<=lmax;lat*=2){
|
|
|
|
int Nloop=lmax*128*4/lat;
|
|
|
|
std::vector<int> latt_size ({2*mpi_layout[0],2*mpi_layout[1],4*mpi_layout[2],lat*mpi_layout[3]});
|
|
|
|
GridCartesian Grid(latt_size,simd_layout,mpi_layout);
|
|
|
|
int vol = latt_size[0]*latt_size[1]*latt_size[2]*latt_size[3]*threads;
|
|
|
|
Vec tsum; tsum = zero;
|
|
|
|
GridParallelRNG pRNG(&Grid); pRNG.SeedRandomDevice();
|
|
|
|
std::vector<double> stop(threads);
|
|
Vector<Vec> sum(threads);
|
|
|
|
std::vector<LatticeVec> x(threads,&Grid);
|
|
for(int t=0;t<threads;t++){
|
|
random(pRNG,x[t]);
|
|
}
|
|
|
|
double start=usecond();
|
|
PARALLEL_FOR_LOOP
|
|
for(int t=0;t<threads;t++){
|
|
|
|
sum[t] = x[t]._odata[0];
|
|
for(int i=0;i<Nloop;i++){
|
|
for(auto ss=x[t].begin();ss<x[t].end();ss++){
|
|
sum[t] = sum[t]+x[t]._odata[ss];
|
|
}
|
|
}
|
|
stop[t]=usecond();
|
|
}
|
|
|
|
double max_stop=stop[0];
|
|
double min_stop=stop[0];
|
|
|
|
for(int t=0;t<threads;t++){
|
|
tsum+=sum[t];
|
|
if ( stop[t]<min_stop ) min_stop=stop[t];
|
|
if ( stop[t]>max_stop ) max_stop=stop[t];
|
|
}
|
|
|
|
|
|
|
|
double max_time = (max_stop-start)/Nloop*1000;
|
|
double min_time = (min_stop-start)/Nloop*1000;
|
|
|
|
double bytes=vol*Nvec*sizeof(Real);
|
|
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;
|
|
|
|
}
|
|
|
|
Grid_finalize();
|
|
}
|