Program Listing for File CudaMallocManagedAllocator.hpp¶
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//////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2016-20, Lawrence Livermore National Security, LLC and Umpire
// project contributors. See the COPYRIGHT file for details.
//
// SPDX-License-Identifier: (MIT)
//////////////////////////////////////////////////////////////////////////////
#ifndef UMPIRE_CudaMallocManagedAllocator_HPP
#define UMPIRE_CudaMallocManagedAllocator_HPP
#include <cuda_runtime_api.h>
#include "umpire/util/Macros.hpp"
namespace umpire {
namespace alloc {
/*!
* \brief Uses cudaMallocManaged and cudaFree to allocate and deallocate
* unified memory on NVIDIA GPUs.
*/
struct CudaMallocManagedAllocator {
/*!
* \brief Allocate bytes of memory using cudaMallocManaged.
*
* \param bytes Number of bytes to allocate.
*
* \return Pointer to start of the allocation.
*
* \throws umpire::util::Exception if memory cannot be allocated.
*/
void* allocate(std::size_t bytes)
{
void* ptr = nullptr;
cudaError_t error = ::cudaMallocManaged(&ptr, bytes);
UMPIRE_LOG(Debug, "(bytes=" << bytes << ") returning " << ptr);
if (error != cudaSuccess) {
UMPIRE_ERROR("cudaMallocManaged( bytes = " << bytes
<< " ) failed with error: "
<< cudaGetErrorString(error));
} else {
return ptr;
}
}
/*!
* \brief Deallocate memory using cudaFree.
*
* \param ptr Address to deallocate.
*
* \throws umpire::util::Exception if memory be free'd.
*/
void deallocate(void* ptr)
{
UMPIRE_LOG(Debug, "(ptr=" << ptr << ")");
cudaError_t error = ::cudaFree(ptr);
if (error != cudaSuccess) {
UMPIRE_ERROR("cudaFree( ptr = " << ptr << " ) failed with error: "
<< cudaGetErrorString(error));
}
}
};
} // end of namespace alloc
} // end of namespace umpire
#endif // UMPIRE_CudaMallocManagedAllocator_HPP