OSD_Timer Class Reference

Working on heterogeneous platforms we need to use the system call gettimeofday. This function is portable and it measures ELAPSED time and CPU time in seconds and microseconds. Example: OSD_Timer aTimer; aTimer.Start(); // Start the timers (t1). ..... // Do something. aTimer.Stop(); // Stop the timers (t2). aTimer.Show(); // Give the elapsed time between t1 and t2. // Give also the process CPU time between // t1 and t2. More...

#include <OSD_Timer.hxx>

Inheritance diagram for OSD_Timer:

Public Member Functions
	OSD_Timer (bool theThisThreadOnly=false)
	Builds a Chronometer initialized and stopped.
void	Reset (const double theTimeElapsedSec)
	Stops and reinitializes the timer with specified elapsed time.
void	Reset () override
	Stops and reinitializes the timer with zero elapsed time.
void	Restart () override
	Restarts the Timer.
void	Show () const override
	Shows both the elapsed time and CPU time on the standard output stream <cout>.The chronometer can be running (Lap Time) or stopped.
void	Show (Standard_OStream &os) const override
	Shows both the elapsed time and CPU time on the output stream <OS>.
void	Show (double &theSeconds, int &theMinutes, int &theHours, double &theCPUtime) const
	returns both the elapsed time(seconds,minutes,hours) and CPU time.
void	Stop () override
	Stops the Timer.
void	Start () override
	Starts (after Create or Reset) or restarts (after Stop) the Timer.
double	ElapsedTime () const
	Returns elapsed time in seconds.
Public Member Functions inherited from OSD_Chronometer
	OSD_Chronometer (bool theThisThreadOnly=false)
	Initializes a stopped Chronometer.
virtual	~OSD_Chronometer ()
	Destructor.
bool	IsStarted () const
	Return true if timer has been started.
double	UserTimeCPU () const
	Returns the current CPU user time in seconds. The chronometer can be running (laps Time) or stopped.
double	SystemTimeCPU () const
	Returns the current CPU system time in seconds. The chronometer can be running (laps Time) or stopped.
bool	IsThisThreadOnly () const
	Return TRUE if current thread CPU time should be measured, and FALSE to measure all threads CPU time; FALSE by default,.
void	SetThisThreadOnly (bool theIsThreadOnly)
	Set if current thread (TRUE) or all threads (FALSE) CPU time should be measured. Will raise exception if Timer is in started state.
void	Show (double &theUserSeconds) const
	Returns the current CPU user time in a variable. The chronometer can be running (laps Time) or stopped.
void	Show (double &theUserSec, double &theSystemSec) const
	Returns the current CPU user and system time in variables. The chronometer can be running (laps Time) or stopped.

Static Public Member Functions
static double	GetWallClockTime ()
	Returns current time in seconds with system-defined precision. The could be a system uptime or a time from some date. Returned value is intended for precise elapsed time measurements as a delta between timestamps. On Windows implemented via QueryPerformanceCounter(), on other systems via gettimeofday().
Static Public Member Functions inherited from OSD_Chronometer
static void	GetProcessCPU (double &UserSeconds, double &SystemSeconds)
	Returns CPU time (user and system) consumed by the current process since its start, in seconds. The actual precision of the measurement depends on granularity provided by the system, and is platform-specific.
static void	GetThreadCPU (double &UserSeconds, double &SystemSeconds)
	Returns CPU time (user and system) consumed by the current thread since its start. Note that this measurement is platform-specific, as threads are implemented and managed differently on different platforms and CPUs.

Additional Inherited Members
Protected Attributes inherited from OSD_Chronometer
double	myStartCpuUser
double	myStartCpuSys
double	myCumulCpuUser
double	myCumulCpuSys
bool	myIsStopped
bool	myIsThreadOnly

Detailed Description

Working on heterogeneous platforms we need to use the system call gettimeofday. This function is portable and it measures ELAPSED time and CPU time in seconds and microseconds. Example: OSD_Timer aTimer; aTimer.Start(); // Start the timers (t1). ..... // Do something. aTimer.Stop(); // Stop the timers (t2). aTimer.Show(); // Give the elapsed time between t1 and t2. // Give also the process CPU time between // t1 and t2.

Constructor & Destructor Documentation

OSD_Timer()

OSD_Timer::OSD_Timer

(

bool

theThisThreadOnly = false

)

Builds a Chronometer initialized and stopped.

Parameters

theThisThreadOnly

when TRUE, measured CPU time will account time of the current thread only; otherwise CPU of the process (all threads, and completed children) is measured; this flag does NOT affect ElapsedTime() value, only values returned by OSD_Chronometer

Member Function Documentation

ElapsedTime()

double OSD_Timer::ElapsedTime

(

)

const

Returns elapsed time in seconds.

GetWallClockTime()

static double OSD_Timer::GetWallClockTime ( )

static

Returns current time in seconds with system-defined precision. The could be a system uptime or a time from some date. Returned value is intended for precise elapsed time measurements as a delta between timestamps. On Windows implemented via QueryPerformanceCounter(), on other systems via gettimeofday().

Reset() [1/2]

void OSD_Timer::Reset ( )

overridevirtual

Stops and reinitializes the timer with zero elapsed time.

Reimplemented from OSD_Chronometer.

Reset() [2/2]

void OSD_Timer::Reset

(

const double

theTimeElapsedSec

)

Stops and reinitializes the timer with specified elapsed time.

Restart()

void OSD_Timer::Restart ( )

overridevirtual

Restarts the Timer.

Reimplemented from OSD_Chronometer.

Show() [1/3]

void OSD_Timer::Show ( ) const

overridevirtual

Shows both the elapsed time and CPU time on the standard output stream <cout>.The chronometer can be running (Lap Time) or stopped.

Reimplemented from OSD_Chronometer.

Show() [2/3]

void OSD_Timer::Show	(	double &	theSeconds,
		int &	theMinutes,
		int &	theHours,
		double &	theCPUtime ) const

returns both the elapsed time(seconds,minutes,hours) and CPU time.

Show() [3/3]

void OSD_Timer::Show ( Standard_OStream & os ) const

overridevirtual

Shows both the elapsed time and CPU time on the output stream <OS>.

Reimplemented from OSD_Chronometer.

Start()

void OSD_Timer::Start ( )

overridevirtual

Starts (after Create or Reset) or restarts (after Stop) the Timer.

Reimplemented from OSD_Chronometer.

Stop()

void OSD_Timer::Stop ( )

overridevirtual

Stops the Timer.

Reimplemented from OSD_Chronometer.

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The documentation for this class was generated from the following file:

• OSD_Timer.hxx