测试系统时间精度

Program.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace TimePeriod
{
    class Program
    {
        [DllImport("winmm.dll")]
        internal static extern uint timeBeginPeriod(uint period);

        [DllImport("winmm.dll")]
        internal static extern uint timeEndPeriod(uint period);

        const int sleeptime = 5;
        static void Main(string[] args)
        {
            Stopwatch stopwatch = new Stopwatch();
            stopwatch.Restart();
            Thread.Sleep(sleeptime);
            stopwatch.Stop();
            Console.WriteLine($"Thread.Sleep({sleeptime}) Normal--{stopwatch.ElapsedMilliseconds}ms--{stopwatch.ElapsedTicks}Ticks");

            timeBeginPeriod(1);
            stopwatch.Restart();
            Thread.Sleep(sleeptime);
            stopwatch.Stop();
            Console.WriteLine($"Thread.Sleep({sleeptime}) timeBeginPeriod(1)--{stopwatch.ElapsedMilliseconds}ms--{stopwatch.ElapsedTicks}Ticks");
            timeEndPeriod(1);

            Task.Run(() => 
            {
                int count = 50;
                while (count > 0)
                {
                    count--;
                    stopwatch.Restart();
                    Thread.Sleep(sleeptime);
                    Console.WriteLine($"Thread.Sleep({sleeptime}) Normal--{stopwatch.ElapsedMilliseconds}ms--{stopwatch.ElapsedTicks}Ticks");
                    stopwatch.Stop();
                }
            });

            Console.ReadLine();

        }

        
    }
}