EpikTimer is a programmer's stopwatch that is capable of measuring very short events with traceably high precision over long periods of time. It's simple to use, consumes virtually no CPU and requires only 25 bytes of ram to implement a timer instance. The component provides a single internal timer... but unlimited numbers can be declared externally and linked to a single EpikTimer component on the form.
The download contains the component, an installation package and a demo application (screenshot) that illustrates the features of the component along with some instrumentation for evaluating the clock sources on a given system.
This component was designed for cross-platform applications and was written specifically for the Lazarus IDE and Free Pascal Compiler. It includes a demo application.
Tom Lisjac VlxAdmin
LGPL (please contact the author if the LGPL doesn't work with your project licensing)
The latest stable release can be found on the Lazarus CCR Files page.
Initially written on 24-06-2003 TL
Pre-release 30-06-2003 TL - Needs testing on the BSD's and Win32
Version 0.1 1-7-2003 TL
Version 0.2 3-7-2003 TL
- initial beta release
- Revised logic around hardware detection to prevent executing extended instructions if the HasCapabilityData call returns false.
- Removed exposed low level diagnositic functions from unit interface.
- Revised demo.
cvs -d:pserver:email@example.com:/cvsroot/lazarus login
cvs -z3 -d:pserver:firstname.lastname@example.org:/cvsroot/lazarus co epiktimer
Nanosecond resolution is supported on Intel Pentium versions with a Timestamp Counter.
Microsecond system clock is the default timebase.
Issues: Needs testing... especially on Win32, FreeBSD and older machines that lack TSC hardware.
Drop the component on a form. The component contains a single timer instance and parameterless calls to start, stop, elapsed and clear will implicitly reference it.
If the timer is named ET:
Procedure InstrumentedCall; Begin ET.Clear; // optional... timer is cleared at creation ET.Start; ExecuteFirstTimedSection; ET.Stop; // the timer is actually paused and can be restarted later TimedSection1:=ET.Elapsed; // store the elapsed in a global MakeAnUntimedOverheadCall; // not counted in the timer ET.Start; //resume the timer... continue accumulating ticks CallTimedSection2; TimedSection2:=ET.Elapsed; //timer keeps running... we've just sample it. CallTimedSection3; CallSomethingElse; TimedSection3:=ET.Elapsed; //keep counting... tap the elapsed CallTimedSection4; TimedSection4:=ET.Elapsed; //keep counting... tap the elapsed ET.clear // done... timer is stopped and zeroed end;
You can also create any number of timers from a single component on the form by declaring a TimerData record and passing it as a parameter to start, stop, elapsed and clear using the overloaded methods in the component. An example would be:
Function TimedExecution:Extended; Var DiskAccessTime:TimerData; Begin ET.Clear(DiskAccessTimer); // Declared timers *must* be cleared before use. ET.Start(DiskAccessTimer); ExecuteTheTimedSection; Result:=ET.Elapsed(DiskAccessTimer); // the timer keeps running... etc...
See etdemo.pas for additional examples of component usage
The ETDemo application does not require EpikTimer to be installed in order
to compile and operate. I never liked having to install a palette full of
components only to find out that I didn't like any of them! :)
Here's a screenshot of the demo.
- Open etdemo.lpi
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