Quote:Original post by Washu
Sleep has never been, and never was designed to be, an accurate method of pausing a thread or process. You have told the system that you wish to nap for AT LEAST n milliseconds. If you need accurate timing then use an accurate timing method (such as thread timers) and not a documented innacurate method.

0.001	1.008	1.0072.022	1.0143.036	1.0144.050	1.0145.064	1.0146.078	1.0147.092	1.0148.106	1.0149.120	1.01410.134	1.014

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Runtime.InteropServices;namespace TestTimers{   class Program   {      [DllImport("winmm.dll", EntryPoint = "timeBeginPeriod", SetLastError = true)]      private static extern uint TimeBeginPeriod(uint uMilliseconds);      [DllImport("winmm.dll", EntryPoint = "timeEndPeriod", SetLastError = true)]      private static extern uint TimeEndPeriod(uint uMilliseconds);      static System.Diagnostics.Stopwatch stopWatch = new System.Diagnostics.Stopwatch();      static System.Threading.AutoResetEvent signal = new System.Threading.AutoResetEvent(false);      static void Main(string[] args)      {         TimeBeginPeriod(1);         try         {            stopWatch.Start();            using (System.Threading.Timer timer = new System.Threading.Timer(Program.TimerCheck, null, 0, 1000))            {               System.Threading.Thread.Sleep(10200);            }         }         finally         {            TimeEndPeriod(1);         }      }      static void TimerCheck(object state)      {         decimal time_sec = (decimal)stopWatch.ElapsedTicks / (decimal)System.Diagnostics.Stopwatch.Frequency;         Console.WriteLine(time_sec.ToString());      }   }}

Quote:Original post by Shannon Barber
[...]A ten year old Pentium II running Windows 2000 hits the times better than a i5 running Windows 7.

Quote:Original post by Extrarius

Quote:Original post by Shannon Barber
[...]A ten year old Pentium II running Windows 2000 hits the times better than a i5 running Windows 7.

No, it doesn't. If, when given a delay of "at least 1ms", you delay 1ms or more, you're hitting the delay perfectly. Thus, if a pentium 2 delays 1.0001ms when given "at least 1ms" and a modern core i7 delays 37 minutes when given "at least 1ms", both machine are functioning perfectly to the specification.

If you want to specify a delay of something other than "at least X", you'll have to use a different mechanism that works how you desire. The most accurate such mechanism would be a real-time OS on purpose-designed hardware, but you can do much better on an average PC running windows. Jan Wassenburg has written several articles on the topic of timing that can be found here on gamedev and elsewhere.

Quote:Jan Wassenberg
I've previously written an article about timing, but unfortunately the situation has gotten even worse since then. RDTSC is more broken than before and QPC now uses it instead of only marginally broken alternatives, so that leaves WinXP users on dual-core systems with a total lack of a decent timer.

Quote:
If you called Sleep(10) in your app and it slept for two minutes every time no one would accept that "it works to spec".

Quote:
I have a computer that is 40x more powerful yet is 90% less precise.

Quote:
I have a similar problem: I want to have a timer that sleeps for one second, and until that, the program sleeps (So the CPU won't burn on 100%). But I want to do it precisely: it's a time display in a minesweeper game,

Quote:
14ms

Quote:A second is a long time. You can use QPC to get a better guess at the time spent between your 1second event timers, but a person is going to have a hard time noticing a 15-30ms delay in a 1sec timer when they are focusing on clicking on mines.

Quote:Original post by szecs

Quote:A second is a long time. You can use QPC to get a better guess at the time spent between your 1second event timers, but a person is going to have a hard time noticing a 15-30ms delay in a 1sec timer when they are focusing on clicking on mines.

I want to add best times listing feature

Quote:so precision is essential :P