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Point-to-Point latency #7

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portelli merged 10 commits from simon.buerger/lattice-benchmarks:latency_benchmark into main 2024-11-19 10:37:27 +00:00
Conversation 4 Commits 10 Files Changed 1 +4 -8
1 changed files with 4 additions and 8 deletions
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12
Grid/Benchmark_Grid.cpp
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@ -266,8 +266,8 @@ class Benchmark
static void Latency(void)
{
int Nwarmup = 100;
int Nloop = 1000;
int Nwarmup = 1000;
int Nloop = 10000;
Coordinate simd_layout = GridDefaultSimd(Nd, vComplexD::Nsimd());
Coordinate mpi_layout = GridDefaultMpi();
@ -310,26 +310,22 @@ class Benchmark
{
auto err = MPI_Send(buf_from, bytes, MPI_CHAR, to, 0, Grid.communicator);
assert(err == MPI_SUCCESS);
err = MPI_Recv(buf_to, bytes, MPI_CHAR, to, 0, Grid.communicator, &status);
assert(err == MPI_SUCCESS);
}
if (to == me)
{
auto err =
MPI_Recv(buf_to, bytes, MPI_CHAR, from, 0, Grid.communicator, &status);
assert(err == MPI_SUCCESS);
err = MPI_Send(buf_from, bytes, MPI_CHAR, from, 0, Grid.communicator);
assert(err == MPI_SUCCESS);
}
double stop = usecond();
if (i >= 0)
t_time[i] = stop - start;
}
// important: only the 'from' rank has a trustworthy time
// important: only 'from' and 'to' have meaningful timings. we use 'from's.
MPI_Bcast(t_time.data(), Nloop, MPI_DOUBLE, from, Grid.communicator);
timestat.statistics(t_time);
grid_printf("%2d %2d %15.2f %15.1f %15.2f\n", from, to, timestat.mean,
grid_printf("%2d %2d %15.4f %15.3f %15.4f\n", from, to, timestat.mean,
timestat.err, timestat.min);
nlohmann::json tmp;
tmp["from"] = from;