mirror of
https://github.com/OPM/opm-simulators.git
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94 lines
3.0 KiB
C++
94 lines
3.0 KiB
C++
// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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// vi: set et ts=4 sw=4 sts=4:
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/*
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This file is part of the Open Porous Media project (OPM).
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OPM is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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OPM is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OPM. If not, see <http://www.gnu.org/licenses/>.
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Consult the COPYING file in the top-level source directory of this
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module for the precise wording of the license and the list of
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copyright holders.
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*/
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#include <config.h>
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#include <opm/models/parallel/threadmanager.hpp>
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#ifdef _OPENMP
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#include <omp.h>
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#endif
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#include <opm/models/discretization/common/fvbaseparameters.hh>
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#include <opm/models/utils/parametersystem.hpp>
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namespace Opm {
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int ThreadManager::numThreads_ = 1;
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void ThreadManager::registerParameters()
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{
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Parameters::Register<Parameters::ThreadsPerProcess>
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("The maximum number of threads to be instantiated per process "
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"('-1' means 'automatic')");
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}
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void ThreadManager::init(bool queryCommandLineParameter)
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{
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if (queryCommandLineParameter) {
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numThreads_ = Parameters::Get<Parameters::ThreadsPerProcess>();
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// some safety checks. This is pretty ugly macro-magic, but so what?
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#if !defined(_OPENMP)
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if (numThreads_ != 1 && numThreads_ != -1) {
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throw std::invalid_argument("OpenMP is not available. The only valid values for "
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"threads-per-process is 1 and -1 but it is "+std::to_string(numThreads_)+"!");
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}
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numThreads_ = 1;
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#elif !defined NDEBUG && defined DUNE_INTERFACECHECK
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if (numThreads_ != 1) {
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throw std::invalid_argument("You explicitly enabled Barton-Nackman interface checking in Dune. "
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"The Dune implementation of this is currently incompatible with "
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"thread parallelism!");
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}
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numThreads_ = 1;
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#else
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if (numThreads_ == 0) {
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throw std::invalid_argument("Zero threads per process are not possible: It must be at least 1, "
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"(or -1 for 'automatic')!");
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}
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#endif
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#ifdef _OPENMP
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// actually limit the number of threads
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if (numThreads_ > 0) {
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omp_set_num_threads(numThreads_);
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}
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#endif
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}
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#ifdef _OPENMP
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// get the number of threads which are used in the end.
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numThreads_ = omp_get_max_threads();
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#endif
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}
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unsigned ThreadManager::threadId()
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{
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#ifdef _OPENMP
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return static_cast<unsigned>(omp_get_thread_num());
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#else
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return 0;
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#endif
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}
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} // namespace Opm
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