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POWhy is minimum Threading.Timer interval 15ms despite timeBeginPeriod(1)
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16160179
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16170872
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CreationDate
2013-04-23T03:01:44.330
FavoriteCount
1
LastActivityDate
2013-06-03T01:38:57.817
LastEditDate
2017-05-23T12:07:40.867
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OwnerUserId
709537
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Score
3
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Body
The following snippet <pre><code> [DllImport("winmm.dll", EntryPoint = "timeBeginPeriod")] public static extern uint TimeBeginPeriod(uint uMilliseconds); static void Main(string[] args) { if (TimeBeginPeriod(1) != 0) Console.WriteLine("TimeBeginPeriod failed!"); Console.WriteLine("Sleep"); Stopwatch sw = Stopwatch.StartNew(); for (int i = 0; i < 10; i++) { Thread.Sleep(1); Console.WriteLine(sw.ElapsedTicks * 1000d / Stopwatch.Frequency); sw.Restart(); } Console.WriteLine("Threading.Timer"); sw = null; System.Threading.Timer t = null; int n = 0; t = new Timer(state => { if (sw == null) sw = Stopwatch.StartNew(); else { Console.WriteLine(sw.ElapsedTicks * 1000d / Stopwatch.Frequency); n++; sw.Restart(); } if (n == 10) t.Change(Timeout.Infinite, Timeout.Infinite); }, null, TimeSpan.FromMilliseconds(1), TimeSpan.FromMilliseconds(1)); Console.ReadKey(); } </code></pre> will produce e.g. this output: <pre><code>Sleep 0.151834939915548 0.757358826331279 0.786901687225611 0.712520725399457 0.715593741662697 0.798704863327602 0.5724889615859 0.648825479215934 0.436927039609783 0.517873081634677 Threading.Timer 15.5841035662354 14.8620145856526 15.1098812837944 14.4202684978119 15.3883384620112 14.7210748852159 15.307462261265 15.7125416777831 14.5991320125882 15.6035194417168 </code></pre> According to the net, e.g. a <a href="https://stackoverflow.com/a/13521642/709537">comment by Hans Passant</a>, <code>timeBeginPeriod</code> affects the regular (.net) timers. So why does my timer still have this coarse granularity? <code>Thread.Sleep</code> seems to do just fine. Maybe relevant: This runs on Windows 7, 64bit, .net 4, inside VMWare.
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<.net><timer><sleep>
Title
Why is minimum Threading.Timer interval 15ms despite timeBeginPeriod(1)
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1. PO
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1. USCommunity
UserOwnerUserId
1. USEugene Beresovsky
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