src/gromacs/gpu_utils/gpuregiontimer_ocl.h

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  35
  36 /*! \libinternal \file
  37  *  \brief Implements the GPU region timer for OpenCL.
  38  *
  39  *  \author Aleksei Iupinov <a.yupinov@gmail.com>
  40  *
  41  *  \inlibraryapi
  42  */
  43
  44 #ifndef GMX_GPU_UTILS_GPUREGIONTIMER_OCL_H
  45 #define GMX_GPU_UTILS_GPUREGIONTIMER_OCL_H
  46
  47 #include <array>
  48
  49 #include "gromacs/gpu_utils/oclutils.h"
  50
  51 #include "gpuregiontimer.h"
  52
  53 template <> struct GpuTraits<GpuFramework::OpenCL>
  54 {
  55     using CommandStream = cl_command_queue;
  56     using CommandEvent  = cl_event;
  57 };
  58
  59 //! Short-hand for external use
  60 using GpuRegionTimer = GpuRegionTimerWrapper<GpuFramework::OpenCL>;
  61
  62 // cppcheck-suppress noConstructor
  63 template <> class GpuRegionTimerImpl<GpuFramework::OpenCL>
  64 {
  65     //! Short-hands
  66     using CommandStream = typename GpuTraits<GpuFramework::OpenCL>::CommandStream;
  67     using CommandEvent  = typename GpuTraits<GpuFramework::OpenCL>::CommandEvent;
  68
  69     /*! \brief The underlying individual timing events array.
  70      * The maximum size is chosen arbitrarily to work with current code, and can be changed.
  71      * There is simply no need for run-time resizing, and it's unlikely we'll ever need more than 10.
  72      */
  73     std::array<cl_event, 10> events_ = {{nullptr}};
  74     //! Index of the active event
  75     size_t                   currentEvent_ = 0;
  76
  77     public:
  78
  79         inline void openTimingRegion(CommandStream){}
  80         inline void closeTimingRegion(CommandStream){}
  81
  82         inline double getLastRangeTime()
  83         {
  84             double milliseconds = 0.0;
  85             for (size_t i = 0; i < currentEvent_; i++)
  86             {
  87                 if (events_[i]) // This conditional is ugly, but is required to make some tests (e.g. empty domain) pass
  88                 {
  89                     cl_ulong          start_ns, end_ns;
  90                     cl_int gmx_unused cl_error;
  91
  92                     cl_error = clGetEventProfilingInfo(events_[i], CL_PROFILING_COMMAND_START,
  93                                                        sizeof(cl_ulong), &start_ns, nullptr);
  94                     GMX_ASSERT(CL_SUCCESS == cl_error, "GPU timing update failure");
  95                     cl_error = clGetEventProfilingInfo(events_[i], CL_PROFILING_COMMAND_END,
  96                                                        sizeof(cl_ulong), &end_ns, nullptr);
  97                     GMX_ASSERT(CL_SUCCESS == cl_error, "GPU timing update failure");
  98                     milliseconds += (end_ns - start_ns) / 1000000.0;
  99                 }
 100             }
 101             reset();
 102             return milliseconds;
 103         }
 104
 105         inline void reset()
 106         {
 107             for (size_t i = 0; i < currentEvent_; i++)
 108             {
 109                 if (events_[i]) // This conditional is ugly, but is required to make some tests (e.g. empty domain) pass
 110                 {
 111                     GMX_ASSERT(CL_SUCCESS == clReleaseEvent(events_[i]), "OpenCL event release failure");
 112                 }
 113             }
 114             currentEvent_ = 0;
 115             // As long as we're doing nullptr checks, we might want to be extra cautious.
 116             events_.fill(nullptr);
 117         }
 118
 119         inline CommandEvent *fetchNextEvent()
 120         {
 121             GMX_ASSERT(currentEvent_ < events_.size(), "Increase c_maxEventNumber_ if needed");
 122             cl_event *result = &events_[currentEvent_];
 123             currentEvent_++;
 124             return result;
 125         }
 126 };
 127
 128 #endif