TickCount has never clicked every millisecond. Depending on the OS, it's been anywhere from 10-40 ms if my memory serves me correct.
Thanks, Shawn Wildermuth [EMAIL PROTECTED] > -----Original Message----- > From: dotnet discussion [mailto:[EMAIL PROTECTED]] > On Behalf Of Richard Kucia > Sent: Monday, April 29, 2002 12:14 PM > To: [EMAIL PROTECTED] > Subject: [DOTNET] Thread.Sleep and DateTime resolution > > > My application needs to time some realtime events down to the > millisecond range. It seems that Thread.Sleep only gives a > 10-millisecond resolution. I also believe that DateTime.Now() > only returns the time to the nearest 10-millisecond boundary > -- despite the documentation that indicates DateTime records > an instant in time down to the Tick level. This does not > appear to be a problem with System.Windows.Forms.Timer, as I > can produce accurate delays with it. > > The following test code snippet demonstrates the Thread.Sleep problem: > > Dim I As Integer, Sample(20) As DateTime > For I = 0 To UBound(Sample) > System.Threading.Thread.Sleep(I * 3) > Sample(I) = DateTime.Now() > Next > For I = 1 To UBound(Sample) > Console.WriteLine("Sample({0}) = {1}, Interval = {2} ms", _ > I, Format(Sample(I), "hh:mm:ss.fffff"), > Sample(I).Subtract(Sample(I - 1)).TotalMilliseconds) Next > > The output is: > > Sample(1) = 11:59:50.34376, Interval = 10.0144 ms > Sample(2) = 11:59:50.35378, Interval = 10.0144 ms > Sample(3) = 11:59:50.36379, Interval = 10.0144 ms > Sample(4) = 11:59:50.38382, Interval = 20.0288 ms > Sample(5) = 11:59:50.40385, Interval = 20.0288 ms > Sample(6) = 11:59:50.42388, Interval = 20.0288 ms > Sample(7) = 11:59:50.45392, Interval = 30.0432 ms > Sample(8) = 11:59:50.48396, Interval = 30.0432 ms > Sample(9) = 11:59:50.51401, Interval = 30.0432 ms > Sample(10) = 11:59:50.54405, Interval = 30.0432 ms > Sample(11) = 11:59:50.58411, Interval = 40.0576 ms > Sample(12) = 11:59:50.62417, Interval = 40.0576 ms > Sample(13) = 11:59:50.66422, Interval = 40.0576 ms > Sample(14) = 11:59:50.71430, Interval = 50.072 ms > Sample(15) = 11:59:50.76437, Interval = 50.072 ms > Sample(16) = 11:59:50.81444, Interval = 50.072 ms > Sample(17) = 11:59:50.87453, Interval = 60.0864 ms > Sample(18) = 11:59:50.93461, Interval = 60.0864 ms > Sample(19) = 11:59:50.99470, Interval = 60.0864 ms > Sample(20) = 11:59:51.05479, Interval = 60.0864 ms > > Can anybody shed some light on this problem? Thanks. > > Richard J. Kucia > Owner, Kucia Associates > > You can read messages from the DOTNET archive, unsubscribe > from DOTNET, or subscribe to other DevelopMentor lists at > http://discuss.develop.com. > You can read messages from the DOTNET archive, unsubscribe from DOTNET, or subscribe to other DevelopMentor lists at http://discuss.develop.com.
