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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.

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    About the Author

    Dean Wyant
    Web Developer
    United States United States
    No Biography provided

    Comments and Discussions

     
    GeneralQueryPerformanceCounter fails sometimes, when structmember alignment is set to 1 byte Pinmemberhund1200020-Nov-08 4:42 
    GeneralRe: QueryPerformanceCounter fails sometimes, when structmember alignment is set to 1 byte PinmemberDean Wyant20-Nov-08 5:39 
    QuestionApplication Error When Calling Start(TRUE) Pinmembershizulooi30-Oct-07 23:08 
    AnswerRe: Application Error When Calling Start(TRUE) PinmemberDean Wyant31-Oct-07 3:04 
    Questionproblem compiling CPerfTimer on VC++ Express Pinmemberabarund27-Aug-06 13:08 
    AnswerRe: problem compiling CPerfTimer on VC++ Express PinmemberDean Wyant28-Aug-06 4:30 
    AnswerRe: problem compiling CPerfTimer on VC++ Express PinmemberCoderBruce15-Jul-10 8:01 
    GeneralPossible bug Pinmembermetimmee7-May-06 12:39 
    GeneralRe: Possible bug PinmemberDean Wyant12-May-06 5:08 
    GeneralLaptop Pinmemberzvivered30-Mar-05 7:11 
    GeneralRe: Laptop PinmemberDean Wyant30-Mar-05 12:21 
    GeneralWindows CE PinmemberGrimoire2-Nov-04 12:31 
    GeneralExcellent Pinmemberthought20-Jan-04 1:48 
    GeneralNice class. This saved me a lot of time. Pinmembervarnk19-Sep-03 10:06 
    Thanks for this class. I had some problems with the granularity of standard system timers and this
    worked out quite nicely. This saved me a lotof time in making something similar myself.
     
    A couple of questions though.
     
    What is the necessity of the m_Adjust member? It never seems to get set to anything other than 0.
     
    Also, I am using seperate instances of CPerfTimer in different threads. I am assuming that I do not
    need to use the CPerfTimerT since I am not using the same instance of the object in each thread.
    Is my assumption correct?
    GeneralRe: Nice class. This saved me a lot of time. PinmemberDean Wyant31-Oct-07 3:13 
    QuestionWhy not use critical sections? PinmemberBrian van der Beek24-Jun-03 5:27 
    AnswerRe: Why not use critical sections? PinmemberDean Wyant25-Jun-03 17:04 
    QuestionCPerfTimer under VC++? PinmemberDarkGuardian5-Jun-03 3:04 
    AnswerRe: CPerfTimer under VC++? PinmemberDean Wyant5-Jun-03 4:11 
    GeneralRe: CPerfTimer under VC++? PinmemberDarkGuardian5-Jun-03 19:24 
    GeneralRe: CPerfTimer under VC++? PinmemberDarkGuardian5-Jun-03 19:37 
    GeneralRe: CPerfTimer under VC++? Pinmemberbitkidoku26-Sep-06 15:05 
    Generalmissing stdafx.h Pinmembersteven76512-May-03 11:52 
    GeneralRe: missing stdafx.h PinmemberDean Wyant13-May-03 14:23 
    Generalmissing stdafx.h Pinmembersteven76512-May-03 11:52 

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