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The CPerfTimer timer class

, 27 Apr 2000
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This class encapsulates QueryPerformanceCounter for high precision timing
  • Download source files - 3 Kb
  • Updated: the class is now thread safe.

    High resolution timing is supported in Win32 by the QueryPerformanceCounter and QueryPerformanceFrequency API calls. The timer resolution varies with the processor. Today's high speed processors have a timer resolution of less than a microsecond. Of course, this is a much better resolution than the GetTickCount API!

    Using the QueryPerformanceCounter calls directly takes too much typing and the resulting code is usually hard to read. So, I looked all over the net for a timer class but I could not find one that suited me. I wrote a simple and powerful timer class and named it CPerfTimer. I wrote this a long time ago but I still have not had the need to update it. Searching the net I could not find a timer class as simple to use and as useful as CPerfTimer. Several other timer classes are available and they vary as to their simplicity and usefulness. I do not claim that this is the end-all-be-all of timer classes; but, I hope that someone will find it useful enough to refrain from taking the time to write yet another timer class.

    This class is simple to use. Just declare a variable as type CPerfTimer, call Start() to start timing and call Stop() to stop timing. You can pause a timer by calling Stop() and then you can call Start() to resume. Retrieve the elapsed time by calling an Elapsed...() function. Assignment, addition, subtraction and comparison are supported. There are a few information calls available also. All calls except Start and Stop can be performed on a timer without stopping it.

    I have not included separate documentation or example application. The code is fairly well documented and the above paragraph was copied from the CPerfTimer.h file. Methods for adding, subtracting and comparing CPerfTimers and seconds (double) are also included. And, a CPerfTimerT class that should be thread safe (no extensive testing has been done). Please inform me if any bugs are found or you have an idea for an enhancement.


    This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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    About the Author

    Dean Wyant
    Web Developer
    United States United States
    No Biography provided

    Comments and Discussions

    GeneralRe: Laptop Pin
    Dean Wyant at 30-Mar-05 13:21
    memberDean Wyant30-Mar-05 13:21 
    GeneralWindows CE Pin
    Grimoire at 2-Nov-04 13:31
    memberGrimoire2-Nov-04 13:31 
    GeneralExcellent Pin
    thought at 20-Jan-04 2:48
    memberthought20-Jan-04 2:48 
    GeneralNice class. This saved me a lot of time. Pin
    varnk at 19-Sep-03 11:06
    membervarnk19-Sep-03 11:06 
    GeneralRe: Nice class. This saved me a lot of time. Pin
    Dean Wyant at 31-Oct-07 4:13
    memberDean Wyant31-Oct-07 4:13 
    QuestionWhy not use critical sections? Pin
    Brian van der Beek at 24-Jun-03 6:27
    memberBrian van der Beek24-Jun-03 6:27 
    AnswerRe: Why not use critical sections? Pin
    Dean Wyant at 25-Jun-03 18:04
    memberDean Wyant25-Jun-03 18:04 
    QuestionCPerfTimer under VC++? Pin
    DarkGuardian at 5-Jun-03 4:04
    memberDarkGuardian5-Jun-03 4:04 
    AnswerRe: CPerfTimer under VC++? Pin
    Dean Wyant at 5-Jun-03 5:11
    memberDean Wyant5-Jun-03 5:11 
    GeneralRe: CPerfTimer under VC++? Pin
    DarkGuardian at 5-Jun-03 20:24
    memberDarkGuardian5-Jun-03 20:24 
    GeneralRe: CPerfTimer under VC++? Pin
    DarkGuardian at 5-Jun-03 20:37
    memberDarkGuardian5-Jun-03 20:37 
    GeneralRe: CPerfTimer under VC++? Pin
    bitkidoku at 26-Sep-06 16:05
    memberbitkidoku26-Sep-06 16:05 
    Generalmissing stdafx.h Pin
    steven765 at 12-May-03 12:52
    membersteven76512-May-03 12:52 
    GeneralRe: missing stdafx.h Pin
    Dean Wyant at 13-May-03 15:23
    memberDean Wyant13-May-03 15:23 
    Generalmissing stdafx.h Pin
    steven765 at 12-May-03 12:52
    membersteven76512-May-03 12:52 
    GeneralOn multiprocessor machine Pin
    warmcold at 4-May-03 13:33
    memberwarmcold4-May-03 13:33 
    QuestionCPerfTimerT class ? Pin
    Anonymous at 27-Dec-02 2:02
    sussAnonymous27-Dec-02 2:02 
    AnswerRe: CPerfTimerT class ? Pin
    Dean Wyant at 28-Dec-02 3:40
    memberDean Wyant28-Dec-02 3:40 
    QuestionJava timer? Pin
    sharonr1 at 17-Dec-02 4:21
    susssharonr117-Dec-02 4:21 
    QuestionLicense ? Pin
    George at 13-Nov-02 21:30
    memberGeorge13-Nov-02 21:30 
    AnswerRe: License ? Pin
    Dean Wyant at 16-Nov-02 5:48
    memberDean Wyant16-Nov-02 5:48 
    GeneralRe: License ? Pin
    George at 16-Nov-02 6:51
    memberGeorge16-Nov-02 6:51 
    GeneralPerformance Issue Pin
    AllanK at 6-Jan-03 9:19
    memberAllanK6-Jan-03 9:19 
    GeneralRe: Performance Issue Pin
    Dean Wyant at 9-Jan-03 14:50
    memberDean Wyant9-Jan-03 14:50 
    QuestionIs it a Timer or a TimeCounter? Pin
    miliu at 15-Sep-02 18:35
    sussmiliu15-Sep-02 18:35 

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