wehub-resource-sync
113 lines
3.5 KiB
C++
113 lines
3.5 KiB
C++
/*
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* SPDX-FileCopyrightText: Copyright (c) 1993-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef STREAM_READER_H
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#define STREAM_READER_H
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#include "NvInferRuntime.h"
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#include "sampleUtils.h"
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#include <fstream>
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namespace samplesCommon
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{
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//! Implements the TensorRT IStreamReaderV2 interface to allow deserializing an engine directly from the plan file.
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//! Supports seeking to a position within the file, and reading directly to device pointers.
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//! This implementation is not optimized, and will not provide performance improvements over the existing reader.
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class AsyncStreamReader final : public nvinfer1::IStreamReaderV2
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{
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public:
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bool open(std::string const& filepath)
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{
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mFile.open(filepath, std::ios::binary);
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return mFile.is_open();
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}
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void close()
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{
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if (mFile.is_open())
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{
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mFile.close();
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}
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}
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~AsyncStreamReader() final
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{
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close();
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}
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bool seek(int64_t offset, nvinfer1::SeekPosition where) noexcept final
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{
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switch (where)
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{
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case (nvinfer1::SeekPosition::kSET): mFile.seekg(offset, std::ios_base::beg); break;
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case (nvinfer1::SeekPosition::kCUR): mFile.seekg(offset, std::ios_base::cur); break;
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case (nvinfer1::SeekPosition::kEND): mFile.seekg(offset, std::ios_base::end); break;
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}
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return mFile.good();
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}
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int64_t read(void* destination, int64_t nbBytes, cudaStream_t stream) noexcept final
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{
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if (!mFile.good())
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{
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return -1;
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}
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cudaPointerAttributes attributes;
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ASSERT(cudaPointerGetAttributes(&attributes, destination) == cudaSuccess);
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// from CUDA 11 onward, host pointers are return cudaMemoryTypeUnregistered
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if (attributes.type == cudaMemoryTypeHost || attributes.type == cudaMemoryTypeUnregistered)
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{
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mFile.read(static_cast<char*>(destination), nbBytes);
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return mFile.gcount();
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}
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else if (attributes.type == cudaMemoryTypeDevice)
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{
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// Set up a temp buffer to read into if reading into device memory.
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std::unique_ptr<char[]> tmpBuf{new char[nbBytes]};
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mFile.read(tmpBuf.get(), nbBytes);
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// cudaMemcpyAsync into device storage.
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ASSERT(cudaMemcpyAsync(destination, tmpBuf.get(), nbBytes, cudaMemcpyHostToDevice, stream) == cudaSuccess);
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// No race between the copying and freeing of tmpBuf, because cudaMemcpyAsync will
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// return once the pageable buffer has been copied to the staging memory for DMA transfer
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// to device memory.
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return mFile.gcount();
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}
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return -1;
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}
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void reset()
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{
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ASSERT(mFile.good());
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mFile.seekg(0);
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}
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bool isOpen() const
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{
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return mFile.is_open();
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}
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private:
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std::ifstream mFile;
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};
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} // namespace samplesCommon
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#endif // STREAM_READER_H
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