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GPU tweaks for benchmarking; really necessary?

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paboyle
2018-06-13 20:26:07 +01:00
parent 94d1ae4c82
commit 25becc9324
3 changed files with 23 additions and 31 deletions
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21
benchmarks/Benchmark_memory_bandwidth.cc
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@ -30,7 +30,6 @@ Author: paboyle <paboyle@ph.ed.ac.uk>
using namespace std;
using namespace Grid;
;
int main (int argc, char ** argv)
{
@ -55,8 +54,8 @@ int main (int argc, char ** argv)
std::cout<<GridLogMessage << "===================================================================================================="<<std::endl;
std::cout<<GridLogMessage << " L "<<"\t\t"<<"bytes"<<"\t\t\t"<<"GB/s"<<"\t\t"<<"Gflop/s"<<"\t\t seconds"<<std::endl;
std::cout<<GridLogMessage << "----------------------------------------------------------"<<std::endl;
uint64_t lmax=96;
#define NLOOP (10*lmax*lmax*lmax*lmax/vol)
uint64_t lmax=48;
#define NLOOP (100*lmax*lmax*lmax*lmax/vol)
for(int lat=8;lat<=lmax;lat+=8){
Coordinate latt_size ({lat*mpi_layout[0],lat*mpi_layout[1],lat*mpi_layout[2],lat*mpi_layout[3]});
@ -73,14 +72,10 @@ int main (int argc, char ** argv)
double a=2.0;
axpy(z,a,x,y);
double start=usecond();
for(int i=0;i<Nloop;i++){
auto x_v = x.View();
auto y_v = y.View();
auto z_v = z.View();
axpy(z,a,x,y);
x_v[0]=z_v[0]; // serial loop dependence to prevent optimise
y_v[4]=z_v[4];
}
double stop=usecond();
double time = (stop-start)/Nloop*1000;
@ -112,14 +107,10 @@ int main (int argc, char ** argv)
uint64_t Nloop=NLOOP;
z=a*x-y;
double start=usecond();
for(int i=0;i<Nloop;i++){
auto x_v = x.View();
auto y_v = y.View();
auto z_v = z.View();
z=a*x-y;
x_v[0]=z_v[0]; // force serial dependency to prevent optimise away
y_v[4]=z_v[4];
}
double stop=usecond();
double time = (stop-start)/Nloop*1000;
@ -151,12 +142,10 @@ int main (int argc, char ** argv)
LatticeVec y(&Grid);// random(pRNG,y);
RealD a=2.0;
z=a*x;
double start=usecond();
for(int i=0;i<Nloop;i++){
auto x_v = x.View();
auto z_v = z.View();
z=a*x;
x_v[0]=z_v[0]*2.0;
}
double stop=usecond();
double time = (stop-start)/Nloop*1000;