http://snippets.dzone.com/posts Fri, 25 Jul 2008 12:18:29 GMT DZone Snippets: precision timer code http://snippets.dzone.com/posts/show/3920 Usage: <br /><code> <br /> NormalTimer timer1 = new NormalTimer(); <br /> timer1.Start(); <br /> for (int i = 0; i < 1000 * 1000 * 1000; i++) ; <br /> timer1.Stop(); <br /> Console.WriteLine("Duration: {0} seconds", timer1.durationS); <br /> <br /> <br /> PrecisionTimer timer2 = new PrecisionTimer(); <br /> timer2.Start(); <br /> for (int i = 0; i < 1000 * 1000 * 1000; i++) ; <br /> timer2.Stop(); <br /> Console.WriteLine("Duration: {0} seconds", timer2.durationS); <br /></code> <br /> <br /> <br /><code> <br /> internal class UnmanagedApi <br /> { <br /> [DllImport("Kernel32.dll")] <br /> internal static extern bool QueryPerformanceCounter( <br /> out long lpPerformanceCount); <br /> <br /> [DllImport("Kernel32.dll")] <br /> internal static extern bool QueryPerformanceFrequency( <br /> out long lpFrequency); <br /> } <br /> public class PrecisionTimer <br /> { <br /> private long startTick; <br /> private long stopTick; <br /> private long tickFrequency; <br /> public PrecisionTimer() <br /> { <br /> UnmanagedApi.QueryPerformanceFrequency(out tickFrequency); <br /> } <br /> internal class UnmanagedApi <br /> { <br /> [DllImport("Kernel32.dll")] <br /> internal static extern bool QueryPerformanceCounter( <br /> out long lpPerformanceCount); <br /> [DllImport("Kernel32.dll")] <br /> internal static extern bool QueryPerformanceFrequency( <br /> out long lpFrequency); <br /> } <br /> <br /> public void Start() <br /> { <br /> Thread.Sleep(0); //execute waiting threads first, then continue <br /> GC.Collect(); <br /> GC.WaitForPendingFinalizers(); <br /> GC.Collect(); <br /> UnmanagedApi.QueryPerformanceCounter(out startTick); <br /> } <br /> <br /> public void Stop() <br /> { <br /> UnmanagedApi.QueryPerformanceCounter(out stopTick); <br /> } <br /> <br /> public static long Tick() <br /> { <br /> long retVal; <br /> UnmanagedApi.QueryPerformanceCounter(out retVal); <br /> return retVal; <br /> } <br /> <br /> private long ticks <br /> { <br /> get <br /> { <br /> if (startTick > stopTick) <br /> { <br /> startTick = stopTick = 0; <br /> return 0; <br /> } <br /> else <br /> { <br /> return (stopTick - startTick); <br /> } <br /> } <br /> } <br /> public void WriteLine() <br /> { <br /> Console.WriteLine("{0} ms", durationMs); <br /> } <br /> public double durationS <br /> { <br /> get { return (double) ticks/tickFrequency; } <br /> } <br /> public double durationMs <br /> { <br /> get { return durationS*1000; } <br /> } <br /> } <br /> public class NormalTimer <br /> { <br /> private long startTick; <br /> private long stopTick; <br /> public void Start() <br /> { <br /> Thread.Sleep(0); //execute waiting threads first, then continue <br /> startTick = Environment.TickCount; <br /> } <br /> public void Stop() <br /> { <br /> stopTick = Environment.TickCount; <br /> } <br /> private long ticks <br /> { <br /> get <br /> { <br /> if (startTick > stopTick) <br /> { <br /> startTick = stopTick = 0; <br /> return 0; <br /> } <br /> else <br /> { <br /> return (stopTick - startTick); <br /> } <br /> } <br /> } <br /> <br /> public long durationMs <br /> { <br /> get { return ticks; } <br /> } <br /> public double durationS <br /> { <br /> get { return (double) ticks/1000; } <br /> } <br /> } <br /></code> Fri, 27 Apr 2007 07:26:39 GMT http://snippets.dzone.com/posts/show/3920 mstampar (Miroslav Stampar)