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35 /*! \libinternal \file
36 * \brief Implements a GpuEventSynchronizer class.
38 * \author Andrey Alekseenko <al42and@gmail.com>
39 * \author Artem Zhmurov <zhmurov@gmail.com>
40 * \author Aleksei Iupinov <a.yupinov@gmail.com>
43 #ifndef GMX_GPU_UTILS_GPUEVENTSYNCHRONIZER_H
44 #define GMX_GPU_UTILS_GPUEVENTSYNCHRONIZER_H
48 #include "gromacs/utility/classhelpers.h"
49 #include "gromacs/utility/exceptions.h"
50 #include "gromacs/utility/gmxassert.h"
52 #include "device_event.h"
54 /*! \libinternal \brief
55 * A class which allows for CPU thread to mark and wait for certain GPU stream execution point.
56 * The event can be put into the stream with \ref markEvent() and then later waited on with \ref waitForEvent().
57 * This can be repeated as necessary, but the current implementation does not allow waiting on
58 * completed event more than once, expecting only exact pairs of markEvent(stream); waitForEvent().
59 * The class generally attempts to track the correctness of its state transitions, but
60 * please note that calling waitForEvent() right after the construction will fail with OpenCL but succeed with CUDA.
62 class GpuEventSynchronizer
66 GpuEventSynchronizer() = default;
68 ~GpuEventSynchronizer() = default;
69 //! Remove copy assignment, because we can not copy the underlying event object.
70 GpuEventSynchronizer& operator=(const GpuEventSynchronizer&) = delete;
71 //! Remove copy constructor, because we can not copy the underlying event object.
72 GpuEventSynchronizer(const GpuEventSynchronizer&) = delete;
73 //! Remove move assignment, because we don't allow moving the underlying event object.
74 GpuEventSynchronizer& operator=(GpuEventSynchronizer&&) = delete;
75 //! Remove move constructor, because we don't allow moving the underlying event object.
76 GpuEventSynchronizer(GpuEventSynchronizer&&) = delete;
78 /*! \brief Marks the synchronization point in the \p stream.
79 * Should be called first and then followed by \ref waitForEvent().
81 inline void markEvent(const DeviceStream& deviceStream)
83 #if !GMX_GPU_CUDA // For now, we have relaxed conditions for CUDA
84 if (event_.isMarked())
86 GMX_THROW(gmx::InternalError("Trying to mark event before first consuming it"));
89 event_.mark(deviceStream);
91 /*! \brief Synchronizes the host thread on the marked event. */
92 inline void waitForEvent()
94 #if !GMX_GPU_CUDA // For now, we have relaxed conditions for CUDA
95 if (!event_.isMarked())
97 GMX_THROW(gmx::InternalError(
98 "Trying to wait for event before marking it or after fully consuming it"));
104 /*! \brief Checks the completion of the underlying event and resets the object if it was. */
105 inline bool isReady()
107 #if !GMX_GPU_CUDA // For now, we have relaxed conditions for CUDA
108 if (!event_.isMarked())
110 GMX_THROW(gmx::InternalError("Trying to check the status of event before marking it"));
113 bool isReady = event_.isReady();
120 /*! \brief Enqueues a wait for the recorded event in stream \p stream
122 * After enqueue, the associated event is released, so this method should
123 * be only called once per \ref markEvent() call (not enforced in CUDA yet).
125 inline void enqueueWaitEvent(const DeviceStream& deviceStream)
127 #if !GMX_GPU_CUDA // For now, we have relaxed conditions for CUDA
128 if (!event_.isMarked())
131 gmx::InternalError("Trying to enqueue wait for event before marking it or "
132 "after fully consuming it"));
135 event_.enqueueWait(deviceStream);
139 //! Resets the event to unmarked state, releasing the underlying event object if needed.
140 inline void reset() { event_.reset(); }