Re: [aus-dotnet] TotalMilliseconds

[Alex Hoffman]

David,

I'm no hardware guy, but i'm sure the count per second is processor 
dependent, and much higher than the figure you mention.
For example, on my current machine (P4 1.6Mhz), the resolution using a 
high-resolution performance counter is 3,579,545 counts per second.
You can display your own by making the Frequency property public in the 
Counter class I included before, then display the result e.g. 
Console.WriteLine(Counter.Frequency).
Alternatively save the following code as say "frequency.csx", install 
Alintex Script (http://alintex.com/download.aspx) and then double click 
on the "frequency.csx" file.
///////////////////////////////////////////////////////
// frequency.csx

using System;

#region Script
	Console.WriteLine ("Counts per second = " + Counter.Frequency);
#endregion


public class Counter
{
    [System.Runtime.InteropServices.DllImport("KERNEL32")]
    private static extern bool QueryPerformanceCounter(  ref long 
lpPerformanceCount);
    [System.Runtime.InteropServices.DllImport("KERNEL32")]
    private static extern bool QueryPerformanceFrequency( ref long 
lpFrequency);
    long elapsedCount = 0;
    long startCount = 0;

    public void Start()
    {
        startCount = 0;
        QueryPerformanceCounter(ref startCount);
    }

    public void Stop()
    {
        long stopCount = 0;
        QueryPerformanceCounter(ref stopCount);

        elapsedCount += (stopCount - startCount);
    }

    public void Clear()
    {
        elapsedCount = 0;
    }

    public float Seconds
    {
        get
        {
            long freq = 0;
            QueryPerformanceFrequency(ref freq);
            return((float) elapsedCount / (float) freq);
        }
    }

    public override string ToString()
    {
        return String.Format("{0} seconds", Seconds);
    }

    public static long Frequency
    {
        get
        {
            long freq = 0;
            QueryPerformanceFrequency(ref freq);
            return freq;
        }
    }

    static long Value
    {
        get
        {
            long count = 0;
            QueryPerformanceCounter(ref count);
            return count;
        }
    }
}
///////////////////////////////////////////////////////

Alex Hoffman
http://weblogs.asp.net/ahoffman

David Richards said the following:
> I vaguely recall reading that the clock is updated 18 times a second.  This would make the accuracy 1/18th of a second or about 56ms.  Is this correct?
>
> I'm assuming this is a hardware limitation.  I would be curious to know if this is/was the case.
>
>
>
> Regards
> David Richards 	
> Software Support Technician	 
> Product Development	 
> Australian Arrow P/L	 
> Phone: 03 8770 2255	 
> Fax:	 03 8770 2325	 
> "If we can hit that bullseye, the rest of the dominoes
> will fall like a house of cards... checkmate!"
> 	
> -Zapp Brannigan, Futurama 	
>
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