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36 /*! \libinternal \file
37 * \brief Defines the GPU region timer implementation/wrapper classes.
38 * The implementations live in gpuregiontimer.cuh for CUDA and gpuregiontimer_ocl.h for OpenCL.
40 * \author Aleksei Iupinov <a.yupinov@gmail.com>
43 #ifndef GMX_GPU_UTILS_GPUREGIONTIMER_H
44 #define GMX_GPU_UTILS_GPUREGIONTIMER_H
48 #include "gromacs/utility/gmxassert.h"
50 //! Debug GPU timers in debug builds only
52 static const bool c_debugTimerState = false;
54 static const bool c_debugTimerState = true;
57 /*! \libinternal \brief
58 * Enumeration of possible GPU build-paths.
59 * \todo Move somewhere general?
61 enum class GpuFramework
67 /*! \libinternal \brief
68 * GPU build-path traits such as types.
69 * \todo Move somewhere general?
71 template <GpuFramework> struct GpuTraits
73 using CommandStream = void; //!< GPU command stream
74 using CommandEvent = void; //!< Single command call timing event - used in OpenCL
77 /*! \libinternal \brief
78 * This is a GPU region timing implementation interface.
79 * It should provide methods for measuring the last timespan.
81 template <GpuFramework framework> class GpuRegionTimerImpl
84 using CommandStream = typename GpuTraits<framework>::CommandStream;
85 using CommandEvent = typename GpuTraits<framework>::CommandEvent;
88 GpuRegionTimerImpl() = default;
89 ~GpuRegionTimerImpl() = default;
91 /*! \brief Will be called before the region start. */
92 inline void openTimingRegion(CommandStream) = 0;
93 /*! \brief Will be called after the region end. */
94 inline void closeTimingRegion(CommandStream) = 0;
95 /*! \brief Resets any internal state if needed */
96 inline void reset() = 0;
97 /*! \brief Returns the last measured region timespan (in milliseconds) and calls reset() */
98 inline double getLastRangeTime() = 0;
99 /*! \brief Returns a new raw timing event
100 * for passing into individual GPU API calls
101 * within the region if the API requires it (e.g. on OpenCL). */
102 inline CommandEvent *fetchNextEvent() = 0;
105 /*! \libinternal \brief
106 * This is a GPU region timing wrapper class.
107 * It allows for host-side tracking of the execution timespans in GPU code
108 * (measuring kernel or transfers duration).
109 * It also partially tracks the correctness of the timer state transitions,
110 * as far as current implementation allows (see TODO in getLastRangeTime() for a disabled check).
111 * Internally it uses GpuRegionTimerImpl for measuring regions.
113 template <GpuFramework framework> class GpuRegionTimerWrapper
116 using CommandStream = typename GpuTraits<framework>::CommandStream;
117 using CommandEvent = typename GpuTraits<framework>::CommandEvent;
118 //! The timer state used for debug-only assertions
119 enum class TimerState
126 //! The underlying region timer implementation
127 GpuRegionTimerImpl<framework> impl_;
130 GpuRegionTimerWrapper() : impl_()
134 ~GpuRegionTimerWrapper() = default;
136 * To be called before the region start.
138 * \param[in] s The GPU command stream where the event being measured takes place.
140 void openTimingRegion(CommandStream s)
142 if (c_debugTimerState)
144 std::string error = "GPU timer should be idle, but is " + std::string((debugState_ == TimerState::Stopped) ? "stopped" : "recording") + ".";
145 GMX_ASSERT(debugState_ == TimerState::Idle, error.c_str());
146 debugState_ = TimerState::Recording;
148 impl_.openTimingRegion(s);
151 * To be called after the region end.
153 * \param[in] s The GPU command stream where the event being measured takes place.
155 void closeTimingRegion(CommandStream s)
157 if (c_debugTimerState)
159 std::string error = "GPU timer should be recording, but is " + std::string((debugState_ == TimerState::Idle) ? "idle" : "stopped") + ".";
160 GMX_ASSERT(debugState_ == TimerState::Recording, error.c_str());
161 debugState_ = TimerState::Stopped;
163 impl_.closeTimingRegion(s);
166 * Returns the last timespan, and resets the internal timer state.
167 * To be called after closeTimingRegion() and the command stream of the event having been synchronized.
168 * \returns The last timespan (in milliseconds).
170 double getLastRangeTime()
172 if (c_debugTimerState)
174 /* The assertion below is commented because it is currently triggered on a special case:
175 * the early return before the local non-bonded kernel launch if there is nothing to do.
176 * This can be reproduced in OpenCL build by running
177 * mdrun-mpi-test -ntmpi 2 --gtest_filter=*Empty*
178 * Similarly, the GpuRegionTimerImpl suffers from non-nullptr
179 * cl_event conditionals which ideally should only be asserts.
180 * TODO: improve internal task scheduling, re-enable the assert, turn conditionals into asserts
183 std::string error = "GPU timer should be stopped, but is " + std::string((debugState_ == TimerState::Idle) ? "idle" : "recording") + ".";
184 GMX_ASSERT(debugState_ == TimerState::Stopped, error.c_str());
186 debugState_ = TimerState::Idle;
188 double milliseconds = impl_.getLastRangeTime();
191 /*! \brief Resets the implementation and total time/call count to zeroes. */
194 if (c_debugTimerState)
196 debugState_ = TimerState::Idle;
201 * Gets a pointer to a new timing event for passing into individual GPU API calls
202 * within the region if they require it (e.g. on OpenCL).
203 * \returns The pointer to the underlying single command timing event.
205 CommandEvent *fetchNextEvent()
207 if (c_debugTimerState)
209 std::string error = "GPU timer should be recording, but is " + std::string((debugState_ == TimerState::Idle) ? "idle" : "stopped") + ".";
210 GMX_ASSERT(debugState_ == TimerState::Recording, error.c_str());
212 return impl_.fetchNextEvent();