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tamaas.cpp
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Sat, Nov 9, 20:54

tamaas.cpp
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/*
* SPDX-License-Indentifier: AGPL-3.0-or-later
*
* Copyright (©) 2016-2023 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
* Copyright (©) 2020-2023 Lucas Frérot
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "tamaas.hh"
#include "errors.hh"
#include "fftw/interface.hh"
#include "logger.hh"
#include "mpi_interface.hh"
#if TAMAAS_LOOP_BACKEND == TAMAAS_LOOP_BACKEND_OMP
#include <omp.h>
#endif
/* -------------------------------------------------------------------------- */
namespace tamaas {
void initialize(UInt num_threads) {
static bool has_warned = false;
mpi::thread provided = mpi::thread::single;
if (not mpi::initialized()) {
mpi::init_thread(nullptr, nullptr, mpi::thread::multiple, &provided);
}
bool should_init_threads = (provided > mpi::thread::single);
#if TAMAAS_LOOP_BACKEND == TAMAAS_LOOP_BACKEND_OMP
if (num_threads)
omp_set_num_threads(num_threads); // set user-defined number of threads
else
num_threads = omp_get_max_threads();
#else
if (num_threads != 0)
num_threads = 1;
#endif
Logger().get(LogLevel::debug) << "requested " << num_threads << " threads\n";
#if TAMAAS_FFTW_BACKEND != TAMAAS_FFTW_BACKEND_NONE
if (should_init_threads and (not fftw::init_threads())) {
throw std::runtime_error(TAMAAS_MSG("FFTW could not initialize threads!"));
} else if (not should_init_threads)
Logger().get(LogLevel::debug) << "not initializing FFTW threads\n";
#endif
if (mpi::initialized()) {
if (not has_warned) {
Logger().get(LogLevel::warning) << "experimental MPI support\n";
has_warned = true;
}
fftw::mpi::init();
}
if (should_init_threads) {
#if TAMAAS_FFTW_BACKEND != TAMAAS_FFTW_BACKEND_NONE
Logger().get(LogLevel::debug)
<< "initializing FFTW with " << num_threads << " threads\n";
fftw::plan_with_nthreads(num_threads);
#endif
}
#ifdef TAMAAS_USE_CUDA
Logger().get(LogLevel::warning) << "experimental Cuda support\n";
#endif
}
/* -------------------------------------------------------------------------- */
void finalize() {
if (not mpi::finalized()) {
#if TAMAAS_BACKEND != TAMAAS_BACKEND_CPP
fftw::cleanup_threads();
#endif
fftw::mpi::cleanup();
mpi::finalize();
}
}
namespace {
/// Manager for initialize + finalize
struct entry_exit_points {
entry_exit_points() { initialize(); }
~entry_exit_points() { finalize(); }
static const entry_exit_points singleton;
};
const entry_exit_points entry_exit_points::singleton;
} // namespace
} // namespace tamaas

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