Grid/tests/core/Test_sliceSum.cc

#include <Grid/Grid.h>


int main (int argc, char ** argv) {
    
    using namespace Grid;

    Grid_init(&argc,&argv);


    Coordinate latt_size({64,64,64,16});
    auto simd_layout = GridDefaultSimd(Nd, vComplexD::Nsimd());
    auto mpi_layout = GridDefaultMpi();
    GridCartesian Grid(latt_size, simd_layout, mpi_layout);

    std::vector<int> seeds({1, 2, 3, 4});

    GridParallelRNG pRNG(&Grid);
    pRNG.SeedFixedIntegers(seeds);

    LatticeComplexD test_data(&Grid);
    gaussian(pRNG,test_data);

    std::vector<TComplexD> reduction_reference;
    std::vector<TComplexD> reduction_result;

    //warmup
    for (int sweeps = 0; sweeps < 5; sweeps++) {
      reduction_result = sliceSumGpu(test_data,0);
    }

    int trace_id = traceStart("sliceSum benchmark");
    for (int i = 0; i < Nd; i++) {

      RealD t=-usecond();

      tracePush("sliceSum");
      sliceSum(test_data,reduction_reference,i);
      tracePop("sliceSum");

      t+=usecond();

      std::cout << GridLogMessage << " sliceSum took "<<t<<" usecs"<<std::endl;
      
      
      RealD tgpu=-usecond();

      tracePush("sliceSumGpu");
      reduction_result = sliceSumGpu(test_data,i);
      tracePop("sliceSumGpu");

      tgpu+=usecond();

      std::cout << GridLogMessage <<" sliceSumGpu took "<<tgpu<<" usecs"<<std::endl;


      for(int t=0;t<reduction_reference.size();t++) {

        auto diff = reduction_reference[t]-reduction_result[t];
        assert(abs(TensorRemove(diff)) < 1e-8 );

      }

    
    }
    traceStop(trace_id);
    
    Grid_finalize();
    return 0;
}