prefetch.hpp

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/*
 * Copyright (c) 2024-2025, 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.
 */
 
#pragma once
 
#include <rmm/cuda_device.hpp>
#include <rmm/cuda_stream_view.hpp>
#include <rmm/detail/error.hpp>
#include <rmm/detail/export.hpp>
#include <rmm/error.hpp>
 
#include <cuda/std/span>
 
namespace RMM_NAMESPACE {
 
void prefetch(void const* ptr,
              std::size_t size,
              rmm::cuda_device_id device,
              rmm::cuda_stream_view stream)
{
  auto result = cudaMemPrefetchAsync(ptr, size, device.value(), stream.value());
  // InvalidValue error is raised when non-managed memory is passed to cudaMemPrefetchAsync
  // We should treat this as a no-op
  if (result != cudaErrorInvalidValue && result != cudaSuccess) { RMM_CUDA_TRY(result); }
}
 
template <typename T>
void prefetch(cuda::std::span<T const> data,
              rmm::cuda_device_id device,
              rmm::cuda_stream_view stream)
{
  prefetch(data.data(), data.size_bytes(), device, stream);
}
  // end of group
 
}  // namespace RMM_NAMESPACE