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Added a comms benchmark

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This commit is contained in:
Peter Boyle 2015-05-02 23:51:43 +01:00
parent f663be2a6c
commit 99a1ff423d
1 changed files with 85 additions and 2 deletions
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87
benchmarks/Grid_comms.cc
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@ -12,8 +12,16 @@ int main (int argc, char ** argv)
std::vector<int> mpi_layout ({1,2,2,1});
std::cout << " L "<<"\t\t"<<" Ls "<<"\t\t"<<"bytes"<<"\t\t"<<"MB/s uni"<<"\t\t"<<"MB/s bidi"<<std::endl;
int Nloop=10;
int nmu=0;
for(int mu=0;mu<4;mu++) if (mpi_layout[mu]>1) nmu++;
std::cout << "===================================================================================================="<<std::endl;
std::cout << "= Benchmarking concurrent halo exchange in "<<nmu<<" dimensions"<<std::endl;
std::cout << "===================================================================================================="<<std::endl;
std::cout << " L "<<"\t\t"<<" Ls "<<"\t\t"<<"bytes"<<"\t\t"<<"MB/s uni"<<"\t\t"<<"MB/s bidi"<<std::endl;
for(int lat=4;lat<=16;lat+=4){
for(int Ls=1;Ls<=16;Ls*=2){
@ -75,8 +83,83 @@ int main (int argc, char ** argv)
std::cout << lat<<"\t\t"<<Ls<<"\t\t"<<bytes<<"\t\t"<<xbytes/time<<"\t\t"<<bidibytes/time<<std::endl;
}
}
std::cout << "===================================================================================================="<<std::endl;
std::cout << "= Benchmarking sequential halo exchange in "<<nmu<<" dimensions"<<std::endl;
std::cout << "===================================================================================================="<<std::endl;
std::cout << " L "<<"\t\t"<<" Ls "<<"\t\t"<<"bytes"<<"\t\t"<<"MB/s uni"<<"\t\t"<<"MB/s bidi"<<std::endl;
for(int lat=4;lat<=16;lat+=4){
for(int Ls=1;Ls<=16;Ls*=2){
int bytes=lat*lat*lat*Ls*sizeof(HalfSpinColourVectorD);
double start=usecond();
int ncomm=0;
for(int i=0;i<Nloop;i++){
std::vector<int> latt_size ({lat,lat,lat,lat});
}
GridCartesian Grid(latt_size,simd_layout,mpi_layout);
std::vector<std::vector<HalfSpinColourVectorD> > xbuf(8,std::vector<HalfSpinColourVectorD>(lat*lat*lat*Ls));
std::vector<std::vector<HalfSpinColourVectorD> > rbuf(8,std::vector<HalfSpinColourVectorD>(lat*lat*lat*Ls));
ncomm=0;
for(int mu=0;mu<4;mu++){
if (mpi_layout[mu]>1 ) {
ncomm++;
int comm_proc=1;
int xmit_to_rank;
int recv_from_rank;
{
std::vector<CartesianCommunicator::CommsRequest_t> requests;
Grid.ShiftedRanks(mu,comm_proc,xmit_to_rank,recv_from_rank);
Grid.SendToRecvFromBegin(requests,
(void *)&xbuf[mu][0],
xmit_to_rank,
(void *)&rbuf[mu][0],
recv_from_rank,
bytes);
Grid.SendToRecvFromComplete(requests);
}
comm_proc = mpi_layout[mu]-1;
{
std::vector<CartesianCommunicator::CommsRequest_t> requests;
Grid.ShiftedRanks(mu,comm_proc,xmit_to_rank,recv_from_rank);
Grid.SendToRecvFromBegin(requests,
(void *)&xbuf[mu+4][0],
xmit_to_rank,
(void *)&rbuf[mu+4][0],
recv_from_rank,
bytes);
Grid.SendToRecvFromComplete(requests);
}
}
}
Grid.Barrier();
}
double stop=usecond();
double xbytes = Nloop*bytes*2*ncomm;
double rbytes = xbytes;
double bidibytes = xbytes+rbytes;
double time = stop-start;
std::cout << lat<<"\t\t"<<Ls<<"\t\t"<<bytes<<"\t\t"<<xbytes/time<<"\t\t"<<bidibytes/time<<std::endl;
}
}
Grid_finalize();