src/gromacs/gpu_utils/device_stream.h

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  35 #ifndef GMX_GPU_UTILS_DEVICE_STREAM_H
  36 #define GMX_GPU_UTILS_DEVICE_STREAM_H
  37
  38 /*! \libinternal \file
  39  *
  40  * \brief Declarations for DeviceStream class.
  41  *
  42  * \author Artem Zhmurov <zhmurov@gmail.com>
  43  * \author Mark Abraham <mark.j.abraham@gmail.com>
  44  *
  45  * \ingroup module_gpu_utils
  46  * \inlibraryapi
  47  */
  48
  49 #include "config.h"
  50
  51 #if GMX_GPU_CUDA
  52 #    include <cuda_runtime.h>
  53
  54 #elif GMX_GPU_OPENCL
  55 #    include "gromacs/gpu_utils/gmxopencl.h"
  56 #endif
  57 #include "gromacs/utility/classhelpers.h"
  58
  59 struct DeviceInformation;
  60 class DeviceContext;
  61
  62 //! Enumeration describing the priority with which a stream operates.
  63 enum class DeviceStreamPriority : int
  64 {
  65     //! High-priority stream
  66     High,
  67     //! Normal-priority stream
  68     Normal,
  69     //! Conventional termination of the enumeration
  70     Count
  71 };
  72
  73 /*! \libinternal \brief Declaration of platform-agnostic device stream/queue.
  74  *
  75  * The command stream (or command queue) is a sequence of operations that are executed
  76  * in they order they were issued. Several streams may co-exist to represent concurency.
  77  * This class declares the interfaces, that are exposed to platform-agnostic code and
  78  * it should be implemented for each compute architecture (e.g. CUDA and OpenCL).
  79  *
  80  * Destruction of the \p DeviceStream calls the destructor of the underlying low-level
  81  * stream/queue, hence should only be called when the stream is no longer needed. To
  82  * prevent accidental stream destruction, while copying or moving a \p DeviceStream
  83  * object, copy and move constructors and copy and move assignments are not allowed
  84  * and the \p DeviceStream object should be passed as a pointer or constant reference.
  85  *
  86  */
  87 class DeviceStream
  88 {
  89 public:
  90     /*! \brief Construct and init.
  91      *
  92      * \param[in] deviceContext  Device context (only used in OpenCL).
  93      * \param[in] priority       Stream priority: high or normal (only used in CUDA).
  94      * \param[in] useTiming      If the timing should be enabled (only used in OpenCL).
  95      */
  96     DeviceStream(const DeviceContext& deviceContext, DeviceStreamPriority priority, bool useTiming);
  97
  98     //! Destructor
  99     ~DeviceStream();
 100
 101     /*! \brief Check if the underlying stream is valid.
 102      *
 103      *  \returns Whether the stream is valid (false in CPU-only builds).
 104      */
 105     bool isValid() const;
 106
 107     //! Synchronize the steam
 108     void synchronize() const;
 109
 110 #if GMX_GPU_CUDA
 111
 112     //! Getter
 113     cudaStream_t stream() const;
 114     //! Setter (temporary, will be removed in the follow-up)
 115     void setStream(cudaStream_t stream) { stream_ = stream; }
 116
 117 private:
 118     cudaStream_t stream_ = nullptr;
 119
 120 #elif GMX_GPU_OPENCL || defined DOXYGEN
 121
 122     //! Getter
 123     cl_command_queue stream() const;
 124     //! Setter (temporary, will be removed in the follow-up)
 125     void setStream(cl_command_queue stream) { stream_ = stream; }
 126
 127 private:
 128     cl_command_queue stream_ = nullptr;
 129
 130 #endif
 131
 132     GMX_DISALLOW_COPY_MOVE_AND_ASSIGN(DeviceStream);
 133 };
 134
 135 #endif // GMX_GPU_UTILS_DEVICE_STREAM_H