Updating Healpix CUDA primitive #290
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| /** | ||
| * @file cudastreamhandler.hpp | ||
| * @brief Singleton class for managing CUDA streams and events. | ||
| * | ||
| * This header provides a singleton implementation that encapsulates the creation, | ||
| * management, and cleanup of CUDA streams and events. It offers functions to fork | ||
| * streams, add new streams, and synchronize (join) streams with a given dependency. | ||
| * | ||
| * Usage example: | ||
| * @code | ||
| * #include "cudastreamhandler.hpp" | ||
| * | ||
| * int main() { | ||
| * // Create a handler instance | ||
| * CudaStreamHandler handler; | ||
| * | ||
| * // Fork 4 streams dependent on a given stream 'stream_main' | ||
| * handler.Fork(stream_main, 4); | ||
| * | ||
| * // Do work on the forked streams... | ||
| * | ||
| * // Join the streams back to 'stream_main' | ||
| * handler.join(stream_main); | ||
| * | ||
| * return 0; | ||
| * } | ||
| * @endcode | ||
| * | ||
| * Author: Wassim KABALAN | ||
| */ | ||
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| #ifndef CUDASTREAMHANDLER_HPP | ||
| #define CUDASTREAMHANDLER_HPP | ||
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| #include <algorithm> | ||
| #include <atomic> | ||
| #include <cuda_runtime.h> | ||
| #include <stdexcept> | ||
| #include <thread> | ||
| #include <vector> | ||
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| // Singleton class managing CUDA streams and events | ||
| class CudaStreamHandlerImpl { | ||
| public: | ||
| static CudaStreamHandlerImpl &instance() { | ||
| static CudaStreamHandlerImpl instance; | ||
| return instance; | ||
| } | ||
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| void AddStreams(int numStreams) { | ||
| if (numStreams > m_streams.size()) { | ||
| int streamsToAdd = numStreams - m_streams.size(); | ||
| m_streams.resize(numStreams); | ||
| std::generate(m_streams.end() - streamsToAdd, m_streams.end(), []() { | ||
| cudaStream_t stream; | ||
| cudaStreamCreate(&stream); | ||
| return stream; | ||
| }); | ||
| } | ||
| } | ||
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| void join(cudaStream_t finalStream) { | ||
| std::for_each(m_streams.begin(), m_streams.end(), [this, finalStream](cudaStream_t stream) { | ||
| cudaEvent_t event; | ||
| cudaEventCreate(&event); | ||
| cudaEventRecord(event, stream); | ||
| cudaStreamWaitEvent(finalStream, event, 0); | ||
| m_events.push_back(event); | ||
| }); | ||
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| if (!cleanup_thread.joinable()) { | ||
| stop_thread.store(false); | ||
| cleanup_thread = std::thread([this]() { this->AsyncEventCleanup(); }); | ||
| } | ||
| } | ||
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| // Fork function to add streams and set dependency on a given stream | ||
| void Fork(cudaStream_t dependentStream, int N) { | ||
| AddStreams(N); // Add N streams | ||
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| // Set dependency on the provided stream | ||
| std::for_each(m_streams.end() - N, m_streams.end(), [this, dependentStream](cudaStream_t stream) { | ||
| cudaEvent_t event; | ||
| cudaEventCreate(&event); | ||
| cudaEventRecord(event, dependentStream); | ||
| cudaStreamWaitEvent(stream, event, 0); // Set the stream to wait on the event | ||
| m_events.push_back(event); | ||
| }); | ||
| } | ||
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| auto getIterator() { return StreamIterator(m_streams.begin(), m_streams.end()); } | ||
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| ~CudaStreamHandlerImpl() { | ||
| stop_thread.store(true); | ||
| if (cleanup_thread.joinable()) { | ||
| cleanup_thread.join(); | ||
| } | ||
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| std::for_each(m_streams.begin(), m_streams.end(), cudaStreamDestroy); | ||
| std::for_each(m_events.begin(), m_events.end(), cudaEventDestroy); | ||
| } | ||
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| // Custom Iterator class to iterate over streams | ||
| class StreamIterator { | ||
| public: | ||
| StreamIterator(std::vector<cudaStream_t>::iterator begin, std::vector<cudaStream_t>::iterator end) | ||
| : current(begin), end(end) {} | ||
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| cudaStream_t next() { | ||
| if (current == end) { | ||
| throw std::out_of_range("No more streams."); | ||
| } | ||
| return *current++; | ||
| } | ||
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| bool hasNext() const { return current != end; } | ||
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| private: | ||
| std::vector<cudaStream_t>::iterator current; | ||
| std::vector<cudaStream_t>::iterator end; | ||
| }; | ||
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| private: | ||
| CudaStreamHandlerImpl() : stop_thread(false) {} | ||
| CudaStreamHandlerImpl(const CudaStreamHandlerImpl &) = delete; | ||
| CudaStreamHandlerImpl &operator=(const CudaStreamHandlerImpl &) = delete; | ||
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| void AsyncEventCleanup() { | ||
| while (!stop_thread.load()) { | ||
| std::for_each(m_events.begin(), m_events.end(), [this](cudaEvent_t &event) { | ||
| if (cudaEventQuery(event) == cudaSuccess) { | ||
| cudaEventDestroy(event); | ||
| event = nullptr; | ||
| } | ||
| }); | ||
| std::this_thread::sleep_for(std::chrono::milliseconds(10)); | ||
| } | ||
| } | ||
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| std::vector<cudaStream_t> m_streams; | ||
| std::vector<cudaEvent_t> m_events; | ||
| std::thread cleanup_thread; | ||
| std::atomic<bool> stop_thread; | ||
| }; | ||
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| // Public class for encapsulating the singleton operations | ||
| class CudaStreamHandler { | ||
| public: | ||
| CudaStreamHandler() = default; | ||
| ~CudaStreamHandler() = default; | ||
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| void AddStreams(int numStreams) { CudaStreamHandlerImpl::instance().AddStreams(numStreams); } | ||
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| void join(cudaStream_t finalStream) { CudaStreamHandlerImpl::instance().join(finalStream); } | ||
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| void Fork(cudaStream_t cudastream, int N) { CudaStreamHandlerImpl::instance().Fork(cudastream, N); } | ||
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| // Get the custom iterator for CUDA streams | ||
| CudaStreamHandlerImpl::StreamIterator getIterator() { | ||
| return CudaStreamHandlerImpl::instance().getIterator(); | ||
| } | ||
| }; | ||
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| #endif // CUDASTREAMHANDLER_HPP |
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