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lammps/lib/kokkos/core/src/Kokkos_HBWSpace.hpp
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Kokkos_HBWSpace.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_HBWSPACE_HPP
#define KOKKOS_HBWSPACE_HPP
#include <Kokkos_HostSpace.hpp>
#include <impl/Kokkos_HBWAllocators.hpp>
/*--------------------------------------------------------------------------*/
#ifdef KOKKOS_HAVE_HBWSPACE
namespace Kokkos {
namespace Experimental {
namespace Impl {
/// \brief Initialize lock array for arbitrary size atomics.
///
/// Arbitrary atomics are implemented using a hash table of locks
/// where the hash value is derived from the address of the
/// object for which an atomic operation is performed.
/// This function initializes the locks to zero (unset).
void init_lock_array_hbw_space();
/// \brief Aquire a lock for the address
///
/// This function tries to aquire the lock for the hash value derived
/// from the provided ptr. If the lock is successfully aquired the
/// function returns true. Otherwise it returns false.
bool lock_address_hbw_space(void* ptr);
/// \brief Release lock for the address
///
/// This function releases the lock for the hash value derived
/// from the provided ptr. This function should only be called
/// after previously successfully aquiring a lock with
/// lock_address.
void unlock_address_hbw_space(void* ptr);
} // namespace Impl
} // neamspace Experimental
} // namespace Kokkos
namespace Kokkos {
namespace Experimental {
/// \class HBWSpace
/// \brief Memory management for host memory.
///
/// HBWSpace is a memory space that governs host memory. "Host"
/// memory means the usual CPU-accessible memory.
class HBWSpace {
public:
//! Tag this class as a kokkos memory space
typedef HBWSpace memory_space ;
typedef size_t size_type ;
/// \typedef execution_space
/// \brief Default execution space for this memory space.
///
/// Every memory space has a default execution space. This is
/// useful for things like initializing a View (which happens in
/// parallel using the View's default execution space).
#if defined( KOKKOS_HAVE_DEFAULT_DEVICE_TYPE_OPENMP )
typedef Kokkos::OpenMP execution_space ;
#elif defined( KOKKOS_HAVE_DEFAULT_DEVICE_TYPE_THREADS )
typedef Kokkos::Threads execution_space ;
#elif defined( KOKKOS_HAVE_OPENMP )
typedef Kokkos::OpenMP execution_space ;
#elif defined( KOKKOS_HAVE_PTHREAD )
typedef Kokkos::Threads execution_space ;
#elif defined( KOKKOS_HAVE_SERIAL )
typedef Kokkos::Serial execution_space ;
#else
# error "At least one of the following host execution spaces must be defined: Kokkos::OpenMP, Kokkos::Serial, or Kokkos::Threads. You might be seeing this message if you disabled the Kokkos::Serial device explicitly using the Kokkos_ENABLE_Serial:BOOL=OFF CMake option, but did not enable any of the other host execution space devices."
#endif
//! This memory space preferred device_type
typedef Kokkos::Device<execution_space,memory_space> device_type;
/*--------------------------------*/
/* Functions unique to the HBWSpace */
static int in_parallel();
static void register_in_parallel( int (*)() );
/*--------------------------------*/
/**\brief Default memory space instance */
HBWSpace();
HBWSpace( const HBWSpace & rhs ) = default ;
HBWSpace & operator = ( const HBWSpace & ) = default ;
~HBWSpace() = default ;
/**\brief Non-default memory space instance to choose allocation mechansim, if available */
enum AllocationMechanism { STD_MALLOC , POSIX_MEMALIGN , POSIX_MMAP , INTEL_MM_ALLOC };
explicit
HBWSpace( const AllocationMechanism & );
/**\brief Allocate untracked memory in the space */
void * allocate( const size_t arg_alloc_size ) const ;
/**\brief Deallocate untracked memory in the space */
void deallocate( void * const arg_alloc_ptr
, const size_t arg_alloc_size ) const ;
private:
AllocationMechanism m_alloc_mech ;
friend class Kokkos::Experimental::Impl::SharedAllocationRecord< Kokkos::Experimental::HBWSpace , void > ;
};
} // namespace Experimental
} // namespace Kokkos
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
namespace Kokkos {
namespace Experimental {
namespace Impl {
template<>
class SharedAllocationRecord< Kokkos::Experimental::HBWSpace , void >
: public SharedAllocationRecord< void , void >
{
private:
friend Kokkos::Experimental::HBWSpace ;
typedef SharedAllocationRecord< void , void > RecordBase ;
SharedAllocationRecord( const SharedAllocationRecord & ) = delete ;
SharedAllocationRecord & operator = ( const SharedAllocationRecord & ) = delete ;
static void deallocate( RecordBase * );
/**\brief Root record for tracked allocations from this HBWSpace instance */
static RecordBase s_root_record ;
const Kokkos::Experimental::HBWSpace m_space ;
protected:
~SharedAllocationRecord();
SharedAllocationRecord() = default ;
SharedAllocationRecord( const Kokkos::Experimental::HBWSpace & arg_space
, const std::string & arg_label
, const size_t arg_alloc_size
, const RecordBase::function_type arg_dealloc = & deallocate
);
public:
inline
std::string get_label() const
{
return std::string( RecordBase::head()->m_label );
}
KOKKOS_INLINE_FUNCTION static
SharedAllocationRecord * allocate( const Kokkos::Experimental::HBWSpace & arg_space
, const std::string & arg_label
, const size_t arg_alloc_size
)
{
#if defined( KOKKOS_ACTIVE_EXECUTION_MEMORY_SPACE_HOST )
return new SharedAllocationRecord( arg_space , arg_label , arg_alloc_size );
#else
return (SharedAllocationRecord *) 0 ;
#endif
}
/**\brief Allocate tracked memory in the space */
static
void * allocate_tracked( const Kokkos::Experimental::HBWSpace & arg_space
, const std::string & arg_label
, const size_t arg_alloc_size );
/**\brief Reallocate tracked memory in the space */
static
void * reallocate_tracked( void * const arg_alloc_ptr
, const size_t arg_alloc_size );
/**\brief Deallocate tracked memory in the space */
static
void deallocate_tracked( void * const arg_alloc_ptr );
static SharedAllocationRecord * get_record( void * arg_alloc_ptr );
static void print_records( std::ostream & , const Kokkos::Experimental::HBWSpace & , bool detail = false );
};
} // namespace Impl
} // namespace Experimental
} // namespace Kokkos
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
namespace Kokkos {
namespace Impl {
template<class ExecutionSpace>
struct DeepCopy<Experimental::HBWSpace,Experimental::HBWSpace,ExecutionSpace> {
DeepCopy( void * dst , const void * src , size_t n ) {
memcpy( dst , src , n );
}
DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n ) {
exec.fence();
memcpy( dst , src , n );
}
};
template<class ExecutionSpace>
struct DeepCopy<HostSpace,Experimental::HBWSpace,ExecutionSpace> {
DeepCopy( void * dst , const void * src , size_t n ) {
memcpy( dst , src , n );
}
DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n ) {
exec.fence();
memcpy( dst , src , n );
}
};
template<class ExecutionSpace>
struct DeepCopy<Experimental::HBWSpace,HostSpace,ExecutionSpace> {
DeepCopy( void * dst , const void * src , size_t n ) {
memcpy( dst , src , n );
}
DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n ) {
exec.fence();
memcpy( dst , src , n );
}
};
} // namespace Impl
} // namespace Kokkos
namespace Kokkos {
namespace Impl {
template<>
struct VerifyExecutionCanAccessMemorySpace< Kokkos::HostSpace , Kokkos::Experimental::HBWSpace >
{
enum { value = true };
inline static void verify( void ) { }
inline static void verify( const void * ) { }
};
template<>
struct VerifyExecutionCanAccessMemorySpace< Kokkos::Experimental::HBWSpace , Kokkos::HostSpace >
{
enum { value = true };
inline static void verify( void ) { }
inline static void verify( const void * ) { }
};
} // namespace Impl
} // namespace Kokkos
#endif
#endif /* #define KOKKOS_HBWSPACE_HPP */
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