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/*
* Copyright 2018-2020 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*! \file cuda/memory_resource.h
* \brief Memory resources for the CUDA system.
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/mr/memory_resource.h>
#include <thrust/system/cuda/detail/guarded_cuda_runtime_api.h>
#include <thrust/system/cuda/pointer.h>
#include <thrust/system/detail/bad_alloc.h>
#include <thrust/system/cuda/error.h>
#include <thrust/system/cuda/detail/util.h>
#include <thrust/mr/host_memory_resource.h>
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace cuda
{
//! \cond
namespace detail
{
typedef cudaError_t (CUDARTAPI *allocation_fn)(void **, std::size_t);
typedef cudaError_t (CUDARTAPI *deallocation_fn)(void *);
template<allocation_fn Alloc, deallocation_fn Dealloc, typename Pointer>
class cuda_memory_resource final : public mr::memory_resource<Pointer>
{
public:
Pointer do_allocate(std::size_t bytes, std::size_t alignment = THRUST_MR_DEFAULT_ALIGNMENT) override
{
(void)alignment;
void * ret;
cudaError_t status = Alloc(&ret, bytes);
if (status != cudaSuccess)
{
cudaGetLastError(); // Clear the CUDA global error state.
throw thrust::system::detail::bad_alloc(thrust::cuda_category().message(status).c_str());
}
return Pointer(ret);
}
void do_deallocate(Pointer p, std::size_t bytes, std::size_t alignment) override
{
(void)bytes;
(void)alignment;
cudaError_t status = Dealloc(thrust::detail::pointer_traits<Pointer>::get(p));
if (status != cudaSuccess)
{
thrust::cuda_cub::throw_on_error(status, "CUDA free failed");
}
}
};
inline cudaError_t CUDARTAPI cudaMallocManaged(void ** ptr, std::size_t bytes)
{
return ::cudaMallocManaged(ptr, bytes, cudaMemAttachGlobal);
}
typedef detail::cuda_memory_resource<cudaMalloc, cudaFree,
thrust::cuda::pointer<void> >
device_memory_resource;
typedef detail::cuda_memory_resource<detail::cudaMallocManaged, cudaFree,
thrust::cuda::universal_pointer<void> >
managed_memory_resource;
typedef detail::cuda_memory_resource<cudaMallocHost, cudaFreeHost,
thrust::cuda::universal_pointer<void> >
pinned_memory_resource;
} // end detail
//! \endcond
/*! The memory resource for the CUDA system. Uses <tt>cudaMalloc</tt> and wraps
* the result with \p cuda::pointer.
*/
typedef detail::device_memory_resource memory_resource;
/*! The universal memory resource for the CUDA system. Uses
* <tt>cudaMallocManaged</tt> and wraps the result with
* \p cuda::universal_pointer.
*/
typedef detail::managed_memory_resource universal_memory_resource;
/*! The host pinned memory resource for the CUDA system. Uses
* <tt>cudaMallocHost</tt> and wraps the result with \p
* cuda::universal_pointer.
*/
typedef detail::pinned_memory_resource universal_host_pinned_memory_resource;
} // end cuda
} // end system
namespace cuda
{
using thrust::system::cuda::memory_resource;
using thrust::system::cuda::universal_memory_resource;
using thrust::system::cuda::universal_host_pinned_memory_resource;
}
THRUST_NAMESPACE_END
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