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lammps/lib/kokkos/core/src/Kokkos_OpenMP.hpp
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Kokkos_OpenMP.hpp
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/*
//@HEADER
// ************************************************************************
//
// Kokkos v. 2.0
// Copyright (2014) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact H. Carter Edwards (hcedwar@sandia.gov)
//
// ************************************************************************
//@HEADER
*/
#ifndef KOKKOS_OPENMP_HPP
#define KOKKOS_OPENMP_HPP
#include <Kokkos_Macros.hpp>
#if defined( KOKKOS_ENABLE_OPENMP)
#include <Kokkos_Core_fwd.hpp>
#include <cstddef>
#include <iosfwd>
#include <Kokkos_HostSpace.hpp>
#ifdef KOKKOS_ENABLE_HBWSPACE
#include <Kokkos_HBWSpace.hpp>
#endif
#include <Kokkos_ScratchSpace.hpp>
#include <Kokkos_Parallel.hpp>
#include <Kokkos_TaskScheduler.hpp>
#include <Kokkos_Layout.hpp>
#include <impl/Kokkos_Tags.hpp>
#include <vector>
/*--------------------------------------------------------------------------*/
namespace Kokkos {
namespace Impl {
class OpenMPExec;
}
/// \class OpenMP
/// \brief Kokkos device for multicore processors in the host memory space.
class OpenMP {
public:
//! Tag this class as a kokkos execution space
using execution_space = OpenMP;
using memory_space =
#ifdef KOKKOS_ENABLE_HBWSPACE
Experimental::HBWSpace;
#else
HostSpace;
#endif
//! This execution space preferred device_type
using device_type = Kokkos::Device< execution_space, memory_space >;
using array_layout = LayoutRight;
using size_type = memory_space::size_type;
using scratch_memory_space = ScratchMemorySpace< OpenMP >;
/// \brief Get a handle to the default execution space instance
inline
OpenMP() noexcept;
// Using omp_get_max_threads(); is problematic
// On Intel (essentially an initial call to the OpenMP runtime
// without a parallel region before will set a process mask for a single core
// The runtime will than bind threads for a parallel region to other cores on the
// entering the first parallel region and make the process mask the aggregate of
// the thread masks. The intend seems to be to make serial code run fast, if you
// compile with OpenMP enabled but don't actually use parallel regions or so
// static int omp_max_threads = omp_get_max_threads();
static int get_current_max_threads() noexcept;
/// \brief Initialize the default execution space
///
/// if ( thread_count == -1 )
/// then use the number of threads that openmp defaults to
/// if ( thread_count == 0 && Kokkos::hwlow_available() )
/// then use hwloc to choose the number of threads and change
/// the default number of threads
/// if ( thread_count > 0 )
/// then force openmp to use the given number of threads and change
/// the default number of threads
static void initialize( int thread_count = -1 );
/// \brief Free any resources being consumed by the default execution space
static void finalize();
/// \brief is the default execution space initialized for current 'master' thread
static bool is_initialized() noexcept;
/// \brief Print configuration information to the given output stream.
static void print_configuration( std::ostream & , const bool verbose = false );
/// \brief is the instance running a parallel algorithm
inline
static bool in_parallel( OpenMP const& = OpenMP() ) noexcept;
/// \brief Wait until all dispatched functors complete on the given instance
///
/// This is a no-op on OpenMP
inline
static void fence( OpenMP const& = OpenMP() ) noexcept;
/// \brief Does the given instance return immediately after launching
/// a parallel algorithm
///
/// This always returns false on OpenMP
inline
static bool is_asynchronous( OpenMP const& = OpenMP() ) noexcept;
/// \brief Partition the default instance into new instances without creating
/// new masters
///
/// This is a no-op on OpenMP since the default instance cannot be partitioned
/// without promoting other threads to 'master'
static std::vector<OpenMP> partition(...);
/// Non-default instances should be ref-counted so that when the last
/// is destroyed the instance resources are released
///
/// This is a no-op on OpenMP since a non default instance cannot be created
static OpenMP create_instance(...);
/// \brief Partition the default instance and call 'f' on each new 'master' thread
///
/// Func is a functor with the following signiture
/// void( int partition_id, int num_partitions )
template <typename F>
static void partition_master( F const& f
, int requested_num_partitions = 0
, int requested_partition_size = 0
);
inline
static int thread_pool_size() noexcept;
/** \brief The rank of the executing thread in this thread pool */
KOKKOS_INLINE_FUNCTION
static int thread_pool_rank() noexcept;
#if !defined( KOKKOS_DISABLE_DEPRECATED )
/// \brief Initialize the default execution space
static void initialize( int thread_count,
int use_numa_count,
int use_cores_per_numa = 0);
inline
static int thread_pool_size( int depth );
static void sleep() {};
static void wake() {};
// use UniqueToken
static int concurrency();
// use UniqueToken
inline
static int max_hardware_threads() noexcept;
// use UniqueToken
KOKKOS_INLINE_FUNCTION
static int hardware_thread_id() noexcept;
#endif
static constexpr const char* name() noexcept { return "OpenMP"; }
};
} // namespace Kokkos
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
namespace Kokkos {
namespace Impl {
template<>
struct MemorySpaceAccess
< Kokkos::OpenMP::memory_space
, Kokkos::OpenMP::scratch_memory_space
>
{
enum { assignable = false };
enum { accessible = true };
enum { deepcopy = false };
};
template<>
struct VerifyExecutionCanAccessMemorySpace
< Kokkos::OpenMP::memory_space
, Kokkos::OpenMP::scratch_memory_space
>
{
enum { value = true };
inline static void verify( void ) { }
inline static void verify( const void * ) { }
};
} // namespace Impl
} // namespace Kokkos
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
#include <OpenMP/Kokkos_OpenMP_Exec.hpp>
#include <OpenMP/Kokkos_OpenMP_Team.hpp>
#include <OpenMP/Kokkos_OpenMP_Parallel.hpp>
#include <OpenMP/Kokkos_OpenMP_Task.hpp>
#include <KokkosExp_MDRangePolicy.hpp>
/*--------------------------------------------------------------------------*/
#endif /* #if defined( KOKKOS_ENABLE_OPENMP ) && defined( _OPENMP ) */
#endif /* #ifndef KOKKOS_OPENMP_HPP */
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