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lammps/lib/kokkos/core/src/Kokkos_ScratchSpace.hpp
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Kokkos_ScratchSpace.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_SCRATCHSPACE_HPP
#define KOKKOS_SCRATCHSPACE_HPP
#include <stdio.h>
#include <Kokkos_Core_fwd.hpp>
#include <impl/Kokkos_Tags.hpp>
/*--------------------------------------------------------------------------*/
namespace Kokkos {
/** \brief Scratch memory space associated with an execution space.
*
*/
template< class ExecSpace >
class ScratchMemorySpace {
public:
// Alignment of memory chunks returned by 'get'
// must be a power of two
enum { ALIGN = 8 };
private:
mutable char * m_iter ;
char * m_end ;
ScratchMemorySpace();
ScratchMemorySpace & operator = ( const ScratchMemorySpace & );
enum { MASK = ALIGN - 1 }; // Alignment used by View::shmem_size
public:
//! Tag this class as a memory space
typedef ScratchMemorySpace memory_space ;
typedef ExecSpace execution_space ;
//! This execution space preferred device_type
typedef Kokkos::Device<execution_space,memory_space> device_type;
typedef typename ExecSpace::array_layout array_layout ;
typedef typename ExecSpace::size_type size_type ;
template< typename IntType >
KOKKOS_INLINE_FUNCTION static
IntType align( const IntType & size )
{ return ( size + MASK ) & ~MASK ; }
template< typename IntType >
KOKKOS_INLINE_FUNCTION
void* get_shmem (const IntType& size) const {
void* tmp = m_iter ;
if (m_end < (m_iter += align (size))) {
m_iter -= align (size); // put it back like it was
#ifdef KOKKOS_HAVE_DEBUG
// mfh 23 Jun 2015: printf call consumes 25 registers
// in a CUDA build, so only print in debug mode. The
// function still returns NULL if not enough memory.
printf ("ScratchMemorySpace<...>::get_shmem: Failed to allocate "
"%ld byte(s); remaining capacity is %ld byte(s)\n", long(size),
long(m_end-m_iter));
#endif // KOKKOS_HAVE_DEBUG
tmp = 0;
}
return tmp;
}
template< typename IntType >
KOKKOS_INLINE_FUNCTION
ScratchMemorySpace( void * ptr , const IntType & size )
: m_iter( (char *) ptr )
, m_end( m_iter + size )
{}
};
} // namespace Kokkos
#endif /* #ifndef KOKKOS_SCRATCHSPACE_HPP */
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
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