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lammps/lib/gpu/geryon/ocl_timer.h
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ocl_timer.h
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/***************************************************************************
ocl_timer.h
-------------------
W. Michael Brown
Class for timing OpenCL routines
__________________________________________________________________________
This file is part of the Geryon Unified Coprocessor Library (UCL)
__________________________________________________________________________
begin : Jan Fri 22 2010
copyright : (C) 2010 by W. Michael Brown
email : brownw@ornl.gov
***************************************************************************/
/* -----------------------------------------------------------------------
Copyright (2010) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This software is distributed under
the Simplified BSD License.
----------------------------------------------------------------------- */
#ifndef OCL_TIMER_H
#define OCL_TIMER_H
#include "ocl_macros.h"
#include "ocl_device.h"
#ifdef CL_VERSION_1_2
#define UCL_OCL_MARKER(cq,event) clEnqueueMarkerWithWaitList(cq,0,NULL,event)
#else
#define UCL_OCL_MARKER clEnqueueMarker
#endif
namespace ucl_opencl {
/// Class for timing OpenCL events
class UCL_Timer {
public:
inline UCL_Timer() : _total_time(0.0f), _initialized(false) { }
inline UCL_Timer(UCL_Device &dev) : _total_time(0.0f), _initialized(false)
{ init(dev); }
inline ~UCL_Timer() { clear(); }
/// Clear any data associated with timer
/** \note init() must be called to reuse timer after a clear() **/
inline void clear() {
if (_initialized) {
CL_DESTRUCT_CALL(clReleaseCommandQueue(_cq));
clReleaseEvent(start_event);
clReleaseEvent(stop_event);
_initialized=false;
_total_time=0.0;
}
}
/// Initialize default command queue for timing
inline void init(UCL_Device &dev) { init(dev,dev.cq()); }
/// Initialize command queue for timing
inline void init(UCL_Device &dev, command_queue &cq) {
clear();
t_factor=dev.timer_resolution()/1000000000.0;
_cq=cq;
clRetainCommandQueue(_cq);
_initialized=true;
}
/// Start timing on default command queue
inline void start() { UCL_OCL_MARKER(_cq,&start_event); }
/// Stop timing on default command queue
inline void stop() { UCL_OCL_MARKER(_cq,&stop_event); }
/// Block until the start event has been reached on device
inline void sync_start()
{ CL_SAFE_CALL(clWaitForEvents(1,&start_event)); }
/// Block until the stop event has been reached on device
inline void sync_stop()
{ CL_SAFE_CALL(clWaitForEvents(1,&stop_event)); }
/// Set the time elapsed to zero (not the total_time)
inline void zero()
{ UCL_OCL_MARKER(_cq,&start_event); UCL_OCL_MARKER(_cq,&stop_event); }
/// Set the total time to zero
inline void zero_total() { _total_time=0.0; }
/// Add time from previous start and stop to total
/** Forces synchronization **/
inline double add_to_total()
{ double t=time(); _total_time+=t; return t/1000.0; }
/// Add a user specified time to the total (ms)
inline void add_time_to_total(const double t) { _total_time+=t; }
/// Return the time (ms) of last start to stop - Forces synchronization
inline double time() {
cl_ulong tstart,tend;
CL_SAFE_CALL(clWaitForEvents(1,&stop_event));
CL_SAFE_CALL(clGetEventProfilingInfo(stop_event,
CL_PROFILING_COMMAND_START,
sizeof(cl_ulong), &tend, NULL));
CL_SAFE_CALL(clGetEventProfilingInfo(start_event,
CL_PROFILING_COMMAND_END,
sizeof(cl_ulong), &tstart, NULL));
return (tend-tstart)*t_factor;
}
/// Return the time (s) of last start to stop - Forces synchronization
inline double seconds() { return time()/1000.0; }
/// Return the total time in ms
inline double total_time() { return _total_time; }
/// Return the total time in seconds
inline double total_seconds() { return _total_time/1000.0; }
private:
cl_event start_event, stop_event;
cl_command_queue _cq;
double _total_time;
bool _initialized;
double t_factor;
};
} // namespace
#endif
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