pause in microsecund
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From: alfa on 26 Jan 2010 16:48 I have set pause to microsecund. I have Microsoft Development Environment 2002 (ver.7.0.9466) and .NET Framework 1.0 (ver 1.0.3705) and Stopwatch stopWatch = new Stopwatch(); don't work How can I do it.
From: PvdG42 on 26 Jan 2010 16:59 "alfa" <alfa(a)alfa.hr> wrote in message news:hjnnuq$ppt$1(a)localhost.localdomain... > I have set pause to microsecund. I have Microsoft Development Environment > 2002 (ver.7.0.9466) and .NET Framework 1.0 (ver 1.0.3705) and > Stopwatch stopWatch = new Stopwatch(); don't work > > How can I do it. > What does "don't work" mean? Post the exact error message you got and describe when the error occurred (compile time? run time?) A quick look in MSDN: http://msdn.microsoft.com/en-us/library/system.diagnostics.stopwatch.aspx indicates the class originated in .NET v2.0, indicating your version did not include the class.
From: Peter Duniho on 26 Jan 2010 17:40 alfa wrote: > I have set pause to microsecund. I have Microsoft Development Environment > 2002 (ver.7.0.9466) and .NET Framework 1.0 (ver 1.0.3705) and > Stopwatch stopWatch = new Stopwatch(); don't work > > How can I do it. You can't. Windows is not a real-time operating system, and there is no effectively way to guarantee exactly a microsecond delay. And please don't cross-post so broadly. There's no reason to include non-English-language newsgroups if you're posting your question in English. Pete
From: Armin Zingler on 26 Jan 2010 17:22 alfa schrieb: > I have set pause to microsecund. How did you set the pause? There is no guarantee that you can make a pause of exactly a ceratin period of time because, in a multitasking environment, as an application programmer, your job can be interrupted by other threads running in the system. > I have Microsoft Development Environment > 2002 (ver.7.0.9466) and .NET Framework 1.0 (ver 1.0.3705) and > Stopwatch stopWatch = new Stopwatch(); don't work > > How can I do it. The StopWatch class is new in Framework 2.0. You need Visual Studio 2005 or newer to use Framework 2.0. In Visual Studio 2002, you can call API functions to measure the time like the StopWatch class does. You can look for QueryPerformanceCounter and QueryPerformanceFrequency at http://pinvoke.net If a lower resolution is acceptable, you can use Environment.TickCount http://msdn.microsoft.com/en-us/library/system.environment.tickcount.aspx -- Armin
From: Arne Vajhøj on 30 Jan 2010 12:17
On 26-01-2010 16:48, alfa wrote: > I have set pause to microsecund. I have Microsoft Development Environment > 2002 (ver.7.0.9466) and .NET Framework 1.0 (ver 1.0.3705) and > Stopwatch stopWatch = new Stopwatch(); don't work Your question is not very clear. But I will assume that you want to pause for a number of microseconds. The standard Thread.Sleep only takes milliseconds not microseconds. But Socket.Select takes microseconds. You should note that both have a semantic as "sleep minimum X" not "sleep X". When you go to sleep then other processes/threads start running. And they may continue for a while after the sleeping period has expired. The more busy the system is the longer the actual sleeping period will be. Furthermore there are some overhead and for very small sleep times the overhead becomes significant. The specifics will depend a lot on the computer you are using. Here are some results from a randomly picked computer (mine !): USleep 10 microseconds, overhead factor=97,703125 USleep 50 microseconds, overhead factor=19,53125 USleep 100 microseconds, overhead factor=9,765625 USleep 500 microseconds, overhead factor=1,953125 USleep 1000 microseconds, overhead factor=1,953125 Sleep 1 milliseconds, overhead factor=1,953125 Sleep 5 milliseconds, overhead factor=1,171875 Sleep 10 milliseconds, overhead factor=1,0625 Sleep 50 milliseconds, overhead factor=1,015625 Sleep 100 milliseconds, overhead factor=1,015625 Sleep 500 milliseconds, overhead factor=1 Sleep 1000 milliseconds, overhead factor=1 (program attached below) The short version is that Sleep(1 millisecond) actually takes 2 milliseconds at average, but that USleep(10 microseconds) actually takes 1000 microseconds at average. You will have to evaluate what is useful for you. Arne PS: VS 2002 / .NET 1.0 is extremely old - upgrade is overdue ! ==================================== using System; using System.Collections; using System.Net; using System.Net.Sockets; using System.Threading; namespace E { public static class Util { private static Socket s; static Util() { s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); s.Bind(new IPEndPoint(IPAddress.Any, 12345)); } public static void USleep(int us) { IList sl = new ArrayList(); sl.Add(s); Socket.Select(sl, null, null, us); } } public class Program { public static void TestUSleep(int us) { DateTime t1 = DateTime.Now; for(int i = 0; i < 1000000/us; i++) { Util.USleep(us); } DateTime t2 = DateTime.Now; Console.WriteLine("USleep " + us + " microseconds, overhead factor=" + (t2 - t1).TotalSeconds); } public static void TestSleep(int ms) { DateTime t1 = DateTime.Now; for(int i = 0; i < 1000/ms; i++) { Thread.Sleep(ms); } DateTime t2 = DateTime.Now; Console.WriteLine("Sleep " + ms + " milliseconds, overhead factor=" + (t2 - t1).TotalSeconds); } public static void Main(string[] args) { TestUSleep(10); TestUSleep(50); TestUSleep(100); TestUSleep(500); TestUSleep(1000); TestSleep(1); TestSleep(5); TestSleep(10); TestSleep(50); TestSleep(100); TestSleep(500); TestSleep(1000); Console.ReadKey(); } } } |