opm-simulators/opm/models/parallel/threadmanager.cpp
2024-09-05 10:07:40 +02:00

94 lines
3.0 KiB
C++

// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
// vi: set et ts=4 sw=4 sts=4:
/*
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 2 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/>.
Consult the COPYING file in the top-level source directory of this
module for the precise wording of the license and the list of
copyright holders.
*/
#include <config.h>
#include <opm/models/parallel/threadmanager.hpp>
#ifdef _OPENMP
#include <omp.h>
#endif
#include <opm/models/discretization/common/fvbaseparameters.hh>
#include <opm/models/utils/parametersystem.hpp>
namespace Opm {
int ThreadManager::numThreads_ = 1;
void ThreadManager::registerParameters()
{
Parameters::Register<Parameters::ThreadsPerProcess>
("The maximum number of threads to be instantiated per process "
"('-1' means 'automatic')");
}
void ThreadManager::init(bool queryCommandLineParameter)
{
if (queryCommandLineParameter) {
numThreads_ = Parameters::Get<Parameters::ThreadsPerProcess>();
// some safety checks. This is pretty ugly macro-magic, but so what?
#if !defined(_OPENMP)
if (numThreads_ != 1 && numThreads_ != -1) {
throw std::invalid_argument("OpenMP is not available. The only valid values for "
"threads-per-process is 1 and -1 but it is "+std::to_string(numThreads_)+"!");
}
numThreads_ = 1;
#elif !defined NDEBUG && defined DUNE_INTERFACECHECK
if (numThreads_ != 1) {
throw std::invalid_argument("You explicitly enabled Barton-Nackman interface checking in Dune. "
"The Dune implementation of this is currently incompatible with "
"thread parallelism!");
}
numThreads_ = 1;
#else
if (numThreads_ == 0) {
throw std::invalid_argument("Zero threads per process are not possible: It must be at least 1, "
"(or -1 for 'automatic')!");
}
#endif
#ifdef _OPENMP
// actually limit the number of threads
if (numThreads_ > 0) {
omp_set_num_threads(numThreads_);
}
#endif
}
#ifdef _OPENMP
// get the number of threads which are used in the end.
numThreads_ = omp_get_max_threads();
#endif
}
unsigned ThreadManager::threadId()
{
#ifdef _OPENMP
return static_cast<unsigned>(omp_get_thread_num());
#else
return 0;
#endif
}
} // namespace Opm