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/*
Copyright 2025 SINTEF Digital
This file is part of the Open Porous Media project (OPM).
OPM 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 3 of the License, or
(at your option) any later version.
OPM 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 OPM. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <opm/grid/utility/createThreadIterators.hpp>
#include <opm/grid/utility/ElementChunks.hpp>
#include <opm/grid/utility/StopWatch.hpp>
#include <opm/grid/CpGrid.hpp>
#ifdef _OPENMP
#include <omp.h>
#endif
#include <iostream>
#include <vector>
int main(int argc, char** argv)
{
Dune::MPIHelper::instance(argc, argv);
std::array<int, 3> dims = { 200, 200, 100 };
std::cout << "Creating grid with " << dims[0]*dims[1]*dims[2]/double(1000000) << "M cells." << std::endl;
std::array<double, 3> cellsz = { 1.0, 1.0, 1.0 };
Dune::CpGrid grid;
grid.createCartesian(dims, cellsz);
const auto& gv = grid.leafGridView();
// Plain iteration
{
std::cout << "Running plain loop test." << std::endl;
std::vector<double> vols(grid.size(0));
Opm::time::StopWatch clock;
clock.start();
for (const auto& elem : elements(gv)) {
vols[elem.index()] = elem.geometry().volume();
}
clock.stop();
std::cout << "Time: " << clock.secsSinceLast() << std::endl;
}
#ifdef _OPENMP
// Iteration with chunks
{
const int num_threads = 5;
std::cout << "Running chunked loop test with " << num_threads << " threads." << std::endl;
std::vector<double> vols(grid.size(0));
omp_set_num_threads(num_threads);
Opm::time::StopWatch clock;
clock.start();
[[maybe_unused]] int chunk_size = -1;
const auto grid_chunk_iterators = Opm::createThreadIterators(gv, num_threads, 1000, chunk_size);
const std::size_t num_chunks = grid_chunk_iterators.size() - 1;
#pragma omp parallel for
for (std::size_t chunk = 0; chunk < num_chunks; ++chunk) {
for (auto it = grid_chunk_iterators[chunk]; it != grid_chunk_iterators[chunk+1]; ++it) {
const auto& elem = *it;
vols[elem.index()] = elem.geometry().volume();
}
}
clock.stop();
std::cout << "Time: " << clock.secsSinceLast() << std::endl;
}
// Iteration with chunks using helper class
{
const int num_threads = 5;
std::cout << "Running chunked loop test with " << num_threads << " threads and helper class." << std::endl;
std::vector<double> vols(grid.size(0));
omp_set_num_threads(num_threads);
Opm::time::StopWatch clock;
clock.start();
Opm::ElementChunks chunks(gv, Dune::Partitions::all, num_threads);
#pragma omp parallel for
for (const auto& chunk : chunks) {
for (const auto& elem : chunk) {
vols[elem.index()] = elem.geometry().volume();
}
}
clock.stop();
std::cout << "Time: " << clock.secsSinceLast() << std::endl;
}
#endif // _OPENMP
}
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