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tamaas/src/core/cuda/unified_allocator.hh
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unified_allocator.hh
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/*
* SPDX-License-Indentifier: AGPL-3.0-or-later
*
* Copyright (©) 2016-2022 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
* Copyright (©) 2020-2022 Lucas Frérot
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#ifndef UNIFIED_ALLOCATOR_HH
#define UNIFIED_ALLOCATOR_HH
/* -------------------------------------------------------------------------- */
#include "span.hh"
#include <cuda_runtime_api.h>
#include <memory>
/* -------------------------------------------------------------------------- */
namespace tamaas {
/// Class allocating [unified
/// memory](http://docs.nvidia.com/cuda/cuda-runtime-api/group__CUDART__MEMORY.html#group__CUDART__MEMORY_1gd228014f19cc0975ebe3e0dd2af6dd1b)
template <typename T>
struct UnifiedAllocator {
/// Allocate memory
static span<T> allocate(typename span<T>::size_type n) noexcept {
T* p = nullptr;
cudaMallocManaged(&p, sizeof(T) * n);
return span<T>{p, n};
}
/// Free memory
static void deallocate(span<T> view) noexcept { cudaFree(view.data()); }
};
} // namespace tamaas
#endif // UNIFIED_ALLOCATOR_HH
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