mirror of
https://github.com/OPM/opm-simulators.git
synced 2024-12-25 16:51:00 -06:00
142 lines
4.4 KiB
C++
142 lines
4.4 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.
|
|
*/
|
|
/*!
|
|
* \file
|
|
* \copydoc Opm::ThreadManager
|
|
*/
|
|
#ifndef EWOMS_THREAD_MANAGER_HH
|
|
#define EWOMS_THREAD_MANAGER_HH
|
|
|
|
#ifdef _OPENMP
|
|
#include <omp.h>
|
|
#endif
|
|
|
|
#include <opm/models/discretization/common/fvbaseparameters.hh>
|
|
#include <opm/models/utils/parametersystem.hh>
|
|
#include <opm/models/utils/propertysystem.hh>
|
|
|
|
#include <dune/common/version.hh>
|
|
|
|
namespace Opm {
|
|
|
|
/*!
|
|
* \brief Simplifies multi-threaded capabilities.
|
|
*/
|
|
template <class TypeTag>
|
|
class ThreadManager
|
|
{
|
|
public:
|
|
enum {
|
|
#if defined(_OPENMP) || DOXYGEN
|
|
//! Specify whether OpenMP is really available or not
|
|
isFake = false
|
|
#else
|
|
isFake = true
|
|
#endif
|
|
};
|
|
|
|
/*!
|
|
* \brief Register all run-time parameters of the thread manager.
|
|
*/
|
|
static void registerParameters()
|
|
{
|
|
Parameters::Register<Parameters::ThreadsPerProcess>
|
|
("The maximum number of threads to be instantiated per process "
|
|
"('-1' means 'automatic')");
|
|
}
|
|
|
|
/*!
|
|
* \brief Initialize number of threads used thread manager.
|
|
*
|
|
* \param queryCommandLineParameter if set to true we will query ThreadsPerProcess
|
|
* and if set (disregard the environment variable OPM_NUM_THREADS).
|
|
* If false we will assume that the number of OpenMP threads is already set
|
|
* outside of this function (e.g. by OPM_NUM_THREADS or in the simulator by
|
|
* the ThreadsPerProcess parameter).
|
|
*/
|
|
static void init(bool queryCommandLineParameter = true)
|
|
{
|
|
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
|
|
}
|
|
|
|
/*!
|
|
* \brief Return the maximum number of threads of the current process.
|
|
*/
|
|
static unsigned maxThreads()
|
|
{ return static_cast<unsigned>(numThreads_); }
|
|
|
|
/*!
|
|
* \brief Return the index of the current OpenMP thread
|
|
*/
|
|
static unsigned threadId()
|
|
{
|
|
#ifdef _OPENMP
|
|
return static_cast<unsigned>(omp_get_thread_num());
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
private:
|
|
static int numThreads_;
|
|
};
|
|
|
|
template <class TypeTag>
|
|
int ThreadManager<TypeTag>::numThreads_ = 1;
|
|
} // namespace Opm
|
|
|
|
#endif
|