libtrilinos-kokkos-dev 12.12.1-5 / usr / include / trilinos / Kokkos_CudaSpace.hpp

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//                        Kokkos v. 2.0
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#ifndef KOKKOS_CUDASPACE_HPP
#define KOKKOS_CUDASPACE_HPP

#include <Kokkos_Macros.hpp>
#if defined( KOKKOS_ENABLE_CUDA )

#include <Kokkos_Core_fwd.hpp>

#include <iosfwd>
#include <typeinfo>
#include <string>

#include <Kokkos_HostSpace.hpp>

#include <Cuda/Kokkos_Cuda_abort.hpp>

/*--------------------------------------------------------------------------*/

namespace Kokkos {

/** \brief  Cuda on-device memory management */

class CudaSpace {
public:

  //! Tag this class as a kokkos memory space
  typedef CudaSpace             memory_space ;
  typedef Kokkos::Cuda          execution_space ;
  typedef Kokkos::Device<execution_space,memory_space> device_type;

  typedef unsigned int          size_type ;

  /*--------------------------------*/

  CudaSpace();
  CudaSpace( CudaSpace && rhs ) = default ;
  CudaSpace( const CudaSpace & rhs ) = default ;
  CudaSpace & operator = ( CudaSpace && rhs ) = default ;
  CudaSpace & operator = ( const CudaSpace & rhs ) = default ;
  ~CudaSpace() = default ;

  /**\brief  Allocate untracked memory in the cuda space */
  void * allocate( const size_t arg_alloc_size ) const ;

  /**\brief  Deallocate untracked memory in the cuda space */
  void deallocate( void * const arg_alloc_ptr
                 , const size_t arg_alloc_size ) const ;

  /**\brief Return Name of the MemorySpace */
  static constexpr const char* name();

  /*--------------------------------*/
  /** \brief  Error reporting for HostSpace attempt to access CudaSpace */
  static void access_error();
  static void access_error( const void * const );

private:

  int  m_device ; ///< Which Cuda device

  static constexpr const char* m_name = "Cuda";
  friend class Kokkos::Impl::SharedAllocationRecord< Kokkos::CudaSpace , void > ;
};

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_arrays_cuda_space();

/// \brief Retrieve the pointer to the 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 retrieves the lock array pointer.
/// If the array is not yet allocated it will do so.
int* atomic_lock_array_cuda_space_ptr(bool deallocate = false);

/// \brief Retrieve the pointer to the scratch array for team and thread private global memory.
///
/// Team and Thread private scratch allocations in
/// global memory are aquired via locks.
/// This function retrieves the lock array pointer.
/// If the array is not yet allocated it will do so.
int* scratch_lock_array_cuda_space_ptr(bool deallocate = false);

/// \brief Retrieve the pointer to the scratch array for unique identifiers.
///
/// Unique identifiers in the range 0-Cuda::concurrency
/// are provided via locks.
/// This function retrieves the lock array pointer.
/// If the array is not yet allocated it will do so.
int* threadid_lock_array_cuda_space_ptr(bool deallocate = false);
}
} // namespace Kokkos

/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/

namespace Kokkos {

/** \brief  Cuda memory that is accessible to Host execution space
 *          through Cuda's unified virtual memory (UVM) runtime.
 */
class CudaUVMSpace {
public:

  //! Tag this class as a kokkos memory space
  typedef CudaUVMSpace          memory_space ;
  typedef Cuda                  execution_space ;
  typedef Kokkos::Device<execution_space,memory_space> device_type;
  typedef unsigned int          size_type ;

  /** \brief  If UVM capability is available */
  static bool available();


  /*--------------------------------*/
  /** \brief  CudaUVMSpace specific routine */
  static int number_of_allocations();

  /*--------------------------------*/


  /*--------------------------------*/

  CudaUVMSpace();
  CudaUVMSpace( CudaUVMSpace && rhs ) = default ;
  CudaUVMSpace( const CudaUVMSpace & rhs ) = default ;
  CudaUVMSpace & operator = ( CudaUVMSpace && rhs ) = default ;
  CudaUVMSpace & operator = ( const CudaUVMSpace & rhs ) = default ;
  ~CudaUVMSpace() = default ;

  /**\brief  Allocate untracked memory in the cuda space */
  void * allocate( const size_t arg_alloc_size ) const ;

  /**\brief  Deallocate untracked memory in the cuda space */
  void deallocate( void * const arg_alloc_ptr
                 , const size_t arg_alloc_size ) const ;

  /**\brief Return Name of the MemorySpace */
  static constexpr const char* name();

  /*--------------------------------*/

private:
  int  m_device ; ///< Which Cuda device

  static constexpr const char* m_name = "CudaUVM";

};

} // namespace Kokkos

/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/

namespace Kokkos {

/** \brief  Host memory that is accessible to Cuda execution space
 *          through Cuda's host-pinned memory allocation.
 */
class CudaHostPinnedSpace {
public:

  //! Tag this class as a kokkos memory space
  /** \brief  Memory is in HostSpace so use the HostSpace::execution_space */
  typedef HostSpace::execution_space  execution_space ;
  typedef CudaHostPinnedSpace         memory_space ;
  typedef Kokkos::Device<execution_space,memory_space> device_type;
  typedef unsigned int                size_type ;

  /*--------------------------------*/

  CudaHostPinnedSpace();
  CudaHostPinnedSpace( CudaHostPinnedSpace && rhs ) = default ;
  CudaHostPinnedSpace( const CudaHostPinnedSpace & rhs ) = default ;
  CudaHostPinnedSpace & operator = ( CudaHostPinnedSpace && rhs ) = default ;
  CudaHostPinnedSpace & operator = ( const CudaHostPinnedSpace & rhs ) = default ;
  ~CudaHostPinnedSpace() = default ;

  /**\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 ;

  /**\brief Return Name of the MemorySpace */
  static constexpr const char* name();

private:

  static constexpr const char* m_name = "CudaHostPinned";

  /*--------------------------------*/
};

} // namespace Kokkos

/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/

namespace Kokkos {
namespace Impl {

static_assert( Kokkos::Impl::MemorySpaceAccess< Kokkos::CudaSpace , Kokkos::CudaSpace >::assignable , "" );
static_assert( Kokkos::Impl::MemorySpaceAccess< Kokkos::CudaUVMSpace , Kokkos::CudaUVMSpace >::assignable , "" );
static_assert( Kokkos::Impl::MemorySpaceAccess< Kokkos::CudaHostPinnedSpace , Kokkos::CudaHostPinnedSpace >::assignable , "" );

//----------------------------------------

template<>
struct MemorySpaceAccess< Kokkos::HostSpace , Kokkos::CudaSpace > {
  enum { assignable = false };
  enum { accessible = false };
  enum { deepcopy   = true };
};

template<>
struct MemorySpaceAccess< Kokkos::HostSpace , Kokkos::CudaUVMSpace > {
  // HostSpace::execution_space != CudaUVMSpace::execution_space
  enum { assignable = false };
  enum { accessible = true };
  enum { deepcopy   = true };
};

template<>
struct MemorySpaceAccess< Kokkos::HostSpace , Kokkos::CudaHostPinnedSpace > {
  // HostSpace::execution_space == CudaHostPinnedSpace::execution_space
  enum { assignable = true };
  enum { accessible = true };
  enum { deepcopy   = true };
};

//----------------------------------------

template<>
struct MemorySpaceAccess< Kokkos::CudaSpace , Kokkos::HostSpace > {
  enum { assignable = false };
  enum { accessible = false };
  enum { deepcopy   = true };
};

template<>
struct MemorySpaceAccess< Kokkos::CudaSpace , Kokkos::CudaUVMSpace > {
  // CudaSpace::execution_space == CudaUVMSpace::execution_space
  enum { assignable = true };
  enum { accessible = true };
  enum { deepcopy   = true };
};

template<>
struct MemorySpaceAccess< Kokkos::CudaSpace , Kokkos::CudaHostPinnedSpace > {
  // CudaSpace::execution_space != CudaHostPinnedSpace::execution_space
  enum { assignable = false };
  enum { accessible = true }; // CudaSpace::execution_space
  enum { deepcopy   = true };
};

//----------------------------------------
// CudaUVMSpace::execution_space == Cuda
// CudaUVMSpace accessible to both Cuda and Host

template<>
struct MemorySpaceAccess< Kokkos::CudaUVMSpace , Kokkos::HostSpace > {
  enum { assignable = false };
  enum { accessible = false }; // Cuda cannot access HostSpace
  enum { deepcopy   = true };
};

template<>
struct MemorySpaceAccess< Kokkos::CudaUVMSpace , Kokkos::CudaSpace > {
  // CudaUVMSpace::execution_space == CudaSpace::execution_space
  // Can access CudaUVMSpace from Host but cannot access CudaSpace from Host
  enum { assignable = false };

  // CudaUVMSpace::execution_space can access CudaSpace
  enum { accessible = true };
  enum { deepcopy   = true };
};

template<>
struct MemorySpaceAccess< Kokkos::CudaUVMSpace , Kokkos::CudaHostPinnedSpace > {
  // CudaUVMSpace::execution_space != CudaHostPinnedSpace::execution_space
  enum { assignable = false };
  enum { accessible = true }; // CudaUVMSpace::execution_space
  enum { deepcopy   = true };
};


//----------------------------------------
// CudaHostPinnedSpace::execution_space == HostSpace::execution_space
// CudaHostPinnedSpace accessible to both Cuda and Host

template<>
struct MemorySpaceAccess< Kokkos::CudaHostPinnedSpace , Kokkos::HostSpace > {
  enum { assignable = false }; // Cannot access from Cuda
  enum { accessible = true };  // CudaHostPinnedSpace::execution_space
  enum { deepcopy   = true };
};

template<>
struct MemorySpaceAccess< Kokkos::CudaHostPinnedSpace , Kokkos::CudaSpace > {
  enum { assignable = false }; // Cannot access from Host
  enum { accessible = false };
  enum { deepcopy   = true };
};

template<>
struct MemorySpaceAccess< Kokkos::CudaHostPinnedSpace , Kokkos::CudaUVMSpace > {
  enum { assignable = false }; // different execution_space
  enum { accessible = true };  // same accessibility
  enum { deepcopy   = true };
};

//----------------------------------------

}} // namespace Kokkos::Impl

/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/

namespace Kokkos {
namespace Impl {

void DeepCopyAsyncCuda( void * dst , const void * src , size_t n);

template<> struct DeepCopy< CudaSpace , CudaSpace , Cuda>
{
  DeepCopy( void * dst , const void * src , size_t );
  DeepCopy( const Cuda & , void * dst , const void * src , size_t );
};

template<> struct DeepCopy< CudaSpace , HostSpace , Cuda >
{
  DeepCopy( void * dst , const void * src , size_t );
  DeepCopy( const Cuda & , void * dst , const void * src , size_t );
};

template<> struct DeepCopy< HostSpace , CudaSpace , Cuda >
{
  DeepCopy( void * dst , const void * src , size_t );
  DeepCopy( const Cuda & , void * dst , const void * src , size_t );
};

template<class ExecutionSpace> struct DeepCopy< CudaSpace , CudaSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< CudaSpace , CudaSpace , Cuda >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopyAsyncCuda (dst,src,n);
  }
};

template<class ExecutionSpace> struct DeepCopy< CudaSpace , HostSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< CudaSpace , HostSpace , Cuda>( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopyAsyncCuda (dst,src,n);
  }
};

template<class ExecutionSpace>
struct DeepCopy< HostSpace , CudaSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< HostSpace , CudaSpace , Cuda >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopyAsyncCuda (dst,src,n);
  }
};

template<class ExecutionSpace>
struct DeepCopy< CudaSpace , CudaUVMSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< CudaSpace , CudaSpace , Cuda >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopyAsyncCuda (dst,src,n);
  }
};

template<class ExecutionSpace>
struct DeepCopy< CudaSpace , CudaHostPinnedSpace , ExecutionSpace>
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< CudaSpace , HostSpace , Cuda >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopyAsyncCuda (dst,src,n);
  }
};


template<class ExecutionSpace>
struct DeepCopy< CudaUVMSpace , CudaSpace , ExecutionSpace>
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< CudaSpace , CudaSpace , Cuda >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopyAsyncCuda (dst,src,n);
  }
};

template<class ExecutionSpace>
struct DeepCopy< CudaUVMSpace , CudaUVMSpace , ExecutionSpace>
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< CudaSpace , CudaSpace , Cuda >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopyAsyncCuda (dst,src,n);
  }
};

template<class ExecutionSpace>
struct DeepCopy< CudaUVMSpace , CudaHostPinnedSpace , ExecutionSpace>
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< CudaSpace , HostSpace , Cuda >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopyAsyncCuda (dst,src,n);
  }
};

template<class ExecutionSpace> struct DeepCopy< CudaUVMSpace , HostSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< CudaSpace , HostSpace , Cuda >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopyAsyncCuda (dst,src,n);
  }
};


template<class ExecutionSpace> struct DeepCopy< CudaHostPinnedSpace , CudaSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< HostSpace , CudaSpace , Cuda >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopyAsyncCuda (dst,src,n);
  }
};

template<class ExecutionSpace> struct DeepCopy< CudaHostPinnedSpace , CudaUVMSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< HostSpace , CudaSpace , Cuda >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopyAsyncCuda (dst,src,n);
  }
};

template<class ExecutionSpace> struct DeepCopy< CudaHostPinnedSpace , CudaHostPinnedSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< HostSpace , HostSpace , Cuda >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopyAsyncCuda (dst,src,n);
  }
};

template<class ExecutionSpace> struct DeepCopy< CudaHostPinnedSpace , HostSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< HostSpace , HostSpace , Cuda >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopyAsyncCuda (dst,src,n);
  }
};


template<class ExecutionSpace> struct DeepCopy< HostSpace , CudaUVMSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< HostSpace , CudaSpace , Cuda >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopyAsyncCuda (dst,src,n);
  }
};

template<class ExecutionSpace> struct DeepCopy< HostSpace , CudaHostPinnedSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< HostSpace , HostSpace , Cuda >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopyAsyncCuda (dst,src,n);
  }
};

} // namespace Impl
} // namespace Kokkos

//----------------------------------------------------------------------------
//----------------------------------------------------------------------------

namespace Kokkos {
namespace Impl {

/** Running in CudaSpace attempting to access HostSpace: error */
template<>
struct VerifyExecutionCanAccessMemorySpace< Kokkos::CudaSpace , Kokkos::HostSpace >
{
  enum { value = false };
  KOKKOS_INLINE_FUNCTION static void verify( void )
    { Kokkos::abort("Cuda code attempted to access HostSpace memory"); }

  KOKKOS_INLINE_FUNCTION static void verify( const void * )
    { Kokkos::abort("Cuda code attempted to access HostSpace memory"); }
};

/** Running in CudaSpace accessing CudaUVMSpace: ok */
template<>
struct VerifyExecutionCanAccessMemorySpace< Kokkos::CudaSpace , Kokkos::CudaUVMSpace >
{
  enum { value = true };
  KOKKOS_INLINE_FUNCTION static void verify( void ) { }
  KOKKOS_INLINE_FUNCTION static void verify( const void * ) { }
};

/** Running in CudaSpace accessing CudaHostPinnedSpace: ok */
template<>
struct VerifyExecutionCanAccessMemorySpace< Kokkos::CudaSpace , Kokkos::CudaHostPinnedSpace >
{
  enum { value = true };
  KOKKOS_INLINE_FUNCTION static void verify( void ) { }
  KOKKOS_INLINE_FUNCTION static void verify( const void * ) { }
};

/** Running in CudaSpace attempting to access an unknown space: error */
template< class OtherSpace >
struct VerifyExecutionCanAccessMemorySpace<
  typename enable_if< ! is_same<Kokkos::CudaSpace,OtherSpace>::value , Kokkos::CudaSpace >::type ,
  OtherSpace >
{
  enum { value = false };
  KOKKOS_INLINE_FUNCTION static void verify( void )
    { Kokkos::abort("Cuda code attempted to access unknown Space memory"); }

  KOKKOS_INLINE_FUNCTION static void verify( const void * )
    { Kokkos::abort("Cuda code attempted to access unknown Space memory"); }
};

//----------------------------------------------------------------------------
/** Running in HostSpace attempting to access CudaSpace */
template<>
struct VerifyExecutionCanAccessMemorySpace< Kokkos::HostSpace , Kokkos::CudaSpace >
{
  enum { value = false };
  inline static void verify( void ) { CudaSpace::access_error(); }
  inline static void verify( const void * p ) { CudaSpace::access_error(p); }
};

/** Running in HostSpace accessing CudaUVMSpace is OK */
template<>
struct VerifyExecutionCanAccessMemorySpace< Kokkos::HostSpace , Kokkos::CudaUVMSpace >
{
  enum { value = true };
  inline static void verify( void ) { }
  inline static void verify( const void * ) { }
};

/** Running in HostSpace accessing CudaHostPinnedSpace is OK */
template<>
struct VerifyExecutionCanAccessMemorySpace< Kokkos::HostSpace , Kokkos::CudaHostPinnedSpace >
{
  enum { value = true };
  KOKKOS_INLINE_FUNCTION static void verify( void ) {}
  KOKKOS_INLINE_FUNCTION static void verify( const void * ) {}
};

} // namespace Impl
} // namespace Kokkos

//----------------------------------------------------------------------------
//----------------------------------------------------------------------------

namespace Kokkos {
namespace Impl {

template<>
class SharedAllocationRecord< Kokkos::CudaSpace , void >
  : public SharedAllocationRecord< void , void >
{
private:

  friend class SharedAllocationRecord< Kokkos::CudaUVMSpace , void > ;

  typedef SharedAllocationRecord< void , void >  RecordBase ;

  SharedAllocationRecord( const SharedAllocationRecord & ) = delete ;
  SharedAllocationRecord & operator = ( const SharedAllocationRecord & ) = delete ;

  static void deallocate( RecordBase * );

  static ::cudaTextureObject_t
  attach_texture_object( const unsigned sizeof_alias
                       , void * const   alloc_ptr
                       , const size_t   alloc_size );

  static RecordBase s_root_record ;

  ::cudaTextureObject_t   m_tex_obj ;
  const Kokkos::CudaSpace m_space ;

protected:

  ~SharedAllocationRecord();
  SharedAllocationRecord() : RecordBase(), m_tex_obj(0), m_space() {}

  SharedAllocationRecord( const Kokkos::CudaSpace        & arg_space
                        , const std::string              & arg_label
                        , const size_t                     arg_alloc_size
                        , const RecordBase::function_type  arg_dealloc = & deallocate
                        );

public:

  std::string get_label() const ;

  static SharedAllocationRecord * allocate( const Kokkos::CudaSpace &  arg_space
                                          , const std::string       &  arg_label
                                          , const size_t               arg_alloc_size );

  /**\brief  Allocate tracked memory in the space */
  static
  void * allocate_tracked( const Kokkos::CudaSpace & 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 );

  template< typename AliasType >
  inline
  ::cudaTextureObject_t attach_texture_object()
    {
      static_assert( ( std::is_same< AliasType , int >::value ||
                       std::is_same< AliasType , ::int2 >::value ||
                       std::is_same< AliasType , ::int4 >::value )
                   , "Cuda texture fetch only supported for alias types of int, ::int2, or ::int4" );

      if ( m_tex_obj == 0 ) {
        m_tex_obj = attach_texture_object( sizeof(AliasType)
                                         , (void*) RecordBase::m_alloc_ptr
                                         , RecordBase::m_alloc_size );
      }

      return m_tex_obj ;
    }

  template< typename AliasType >
  inline
  int attach_texture_object_offset( const AliasType * const ptr )
    {
      // Texture object is attached to the entire allocation range
      return ptr - reinterpret_cast<AliasType*>( RecordBase::m_alloc_ptr );
    }

  static void print_records( std::ostream & , const Kokkos::CudaSpace & , bool detail = false );
};


template<>
class SharedAllocationRecord< Kokkos::CudaUVMSpace , void >
  : public SharedAllocationRecord< void , void >
{
private:

  typedef SharedAllocationRecord< void , void >  RecordBase ;

  SharedAllocationRecord( const SharedAllocationRecord & ) = delete ;
  SharedAllocationRecord & operator = ( const SharedAllocationRecord & ) = delete ;

  static void deallocate( RecordBase * );

  static RecordBase s_root_record ;

  ::cudaTextureObject_t      m_tex_obj ;
  const Kokkos::CudaUVMSpace m_space ;

protected:

  ~SharedAllocationRecord();
  SharedAllocationRecord() : RecordBase(), m_tex_obj(0), m_space() {}

  SharedAllocationRecord( const Kokkos::CudaUVMSpace     & arg_space
                        , const std::string              & arg_label
                        , const size_t                     arg_alloc_size
                        , const RecordBase::function_type  arg_dealloc = & deallocate
                        );

public:

  std::string get_label() const ;

  static SharedAllocationRecord * allocate( const Kokkos::CudaUVMSpace &  arg_space
                                          , const std::string          &  arg_label
                                          , const size_t                  arg_alloc_size
                                          );

  /**\brief  Allocate tracked memory in the space */
  static
  void * allocate_tracked( const Kokkos::CudaUVMSpace & 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 );


  template< typename AliasType >
  inline
  ::cudaTextureObject_t attach_texture_object()
    {
      static_assert( ( std::is_same< AliasType , int >::value ||
                       std::is_same< AliasType , ::int2 >::value ||
                       std::is_same< AliasType , ::int4 >::value )
                   , "Cuda texture fetch only supported for alias types of int, ::int2, or ::int4" );

      if ( m_tex_obj == 0 ) {
        m_tex_obj = SharedAllocationRecord< Kokkos::CudaSpace , void >::
          attach_texture_object( sizeof(AliasType)
                               , (void*) RecordBase::m_alloc_ptr
                               , RecordBase::m_alloc_size );
      }

      return m_tex_obj ;
    }

  template< typename AliasType >
  inline
  int attach_texture_object_offset( const AliasType * const ptr )
    {
      // Texture object is attached to the entire allocation range
      return ptr - reinterpret_cast<AliasType*>( RecordBase::m_alloc_ptr );
    }

  static void print_records( std::ostream & , const Kokkos::CudaUVMSpace & , bool detail = false );
};

template<>
class SharedAllocationRecord< Kokkos::CudaHostPinnedSpace , void >
  : public SharedAllocationRecord< void , void >
{
private:

  typedef SharedAllocationRecord< void , void >  RecordBase ;

  SharedAllocationRecord( const SharedAllocationRecord & ) = delete ;
  SharedAllocationRecord & operator = ( const SharedAllocationRecord & ) = delete ;

  static void deallocate( RecordBase * );

  static RecordBase s_root_record ;

  const Kokkos::CudaHostPinnedSpace m_space ;

protected:

  ~SharedAllocationRecord();
  SharedAllocationRecord() : RecordBase(), m_space() {}

  SharedAllocationRecord( const Kokkos::CudaHostPinnedSpace     & arg_space
                        , const std::string              & arg_label
                        , const size_t                     arg_alloc_size
                        , const RecordBase::function_type  arg_dealloc = & deallocate
                        );

public:

  std::string get_label() const ;

  static SharedAllocationRecord * allocate( const Kokkos::CudaHostPinnedSpace &  arg_space
                                          , const std::string          &  arg_label
                                          , const size_t                  arg_alloc_size
                                          );
  /**\brief  Allocate tracked memory in the space */
  static
  void * allocate_tracked( const Kokkos::CudaHostPinnedSpace & 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::CudaHostPinnedSpace & , bool detail = false );
};

} // namespace Impl
} // namespace Kokkos

//----------------------------------------------------------------------------
//----------------------------------------------------------------------------

#endif /* #if defined( KOKKOS_ENABLE_CUDA ) */
#endif /* #define KOKKOS_CUDASPACE_HPP */