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lammps/lib/gpu/geryon/nvd_timer.h
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nvd_timer.h
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/***************************************************************************
nvd_timer.h
-------------------
W. Michael Brown
Class for timing CUDA Driver routines
__________________________________________________________________________
This file is part of the Geryon Unified Coprocessor Library (UCL)
__________________________________________________________________________
begin : Fri Jan 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 NVD_TIMER_H
#define NVD_TIMER_H
#include "nvd_macros.h"
#include "nvd_device.h"
namespace ucl_cudadr {
/// Class for timing CUDA Driver 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) {
CU_DESTRUCT_CALL(cuEventDestroy(start_event));
CU_DESTRUCT_CALL(cuEventDestroy(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();
_cq=cq;
_initialized=true;
CU_SAFE_CALL( cuEventCreate(&start_event,0) );
CU_SAFE_CALL( cuEventCreate(&stop_event,0) );
}
/// Start timing on command queue
inline void start() { CU_SAFE_CALL(cuEventRecord(start_event,_cq)); }
/// Stop timing on command queue
inline void stop() { CU_SAFE_CALL(cuEventRecord(stop_event,_cq)); }
/// Block until the start event has been reached on device
inline void sync_start()
{ CU_SAFE_CALL(cuEventSynchronize(start_event)); }
/// Block until the stop event has been reached on device
inline void sync_stop()
{ CU_SAFE_CALL(cuEventSynchronize(stop_event)); }
/// Set the time elapsed to zero (not the total_time)
inline void zero() {
CU_SAFE_CALL(cuEventRecord(start_event,_cq));
CU_SAFE_CALL(cuEventRecord(stop_event,_cq));
}
/// 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() {
float timer;
CU_SAFE_CALL(cuEventSynchronize(stop_event));
CU_SAFE_CALL( cuEventElapsedTime(&timer,start_event,stop_event) );
return timer;
}
/// 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:
CUevent start_event, stop_event;
CUstream _cq;
double _total_time;
bool _initialized;
};
} // namespace
#endif
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