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First cut at faster GPU slice sum via atomics

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Peter Boyle
2022-12-22 15:13:45 -05:00
parent 4ca1bf7cca
commit 8b91b61b61
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tests/core/Test_slicesum.cc Normal file
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/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./tests/Test_poisson_fft.cc
Copyright (C) 2015
Author: Azusa Yamaguchi <ayamaguc@staffmail.ed.ac.uk>
Author: Peter Boyle <paboyle@ph.ed.ac.uk>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
See the full license in the file "LICENSE" in the top level distribution directory
*************************************************************************************/
/* END LEGAL */
#include <Grid/Grid.h>
#include <Grid/lattice/Lattice_slice_gpu.h>
using namespace Grid;
int main (int argc, char ** argv)
{
Grid_init(&argc,&argv);
int N=16;
std::vector<int> latt_size ({N,N,N,N});
std::vector<int> simd_layout({vComplexD::Nsimd(),1,1,1});
std::vector<int> mpi_layout ({1,1,1,1});
GridCartesian GRID(latt_size,simd_layout,mpi_layout);
LatticeComplexD rn(&GRID);
GridParallelRNG RNG(&GRID);
RNG.SeedFixedIntegers(std::vector<int>({45,12,81,9}));
gaussian(RNG,rn);
std::vector<TComplex> reduced_ref;
std::vector<TComplex> reduced_gpu;
for(int d=0;d<4;d++){
{
RealD t=-usecond();
sliceSum(rn,reduced_ref,d);
t+=usecond();
std::cout << " sliceSum took "<<t<<" usecs"<<std::endl;
}
{
RealD t=-usecond();
sliceSumGpu(rn,reduced_gpu,d);
t+=usecond();
std::cout << " sliceSumGpu took "<<t<<" usecs"<<std::endl;
}
for(int t=0;t<reduced_ref.size();t++){
std::cout << t<<" ref "<< reduced_ref[t] <<" opt " << reduced_gpu[t] << " diff "<<reduced_ref[t]-reduced_gpu[t]<<std::endl;
TComplex diff = reduced_ref[t]-reduced_gpu[t];
assert(abs(TensorRemove(diff)) < 1e-8 );
}
}
Grid_finalize();
}