.NET并行方法

 

using System;
using System.Diagnostics;
using System.Threading.Tasks;
using System.Threading;

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            /*当计算开销大于切换开销时*/
            Stopwatch sw = Stopwatch.StartNew();
            int n=10000;
            Parallel.For(0, n, i =>
            {
                Thread.Sleep(1);
            });
            sw.Stop();
            /*当计算开销大于切换开销时*/
            Stopwatch sw1 = Stopwatch.StartNew();
            for (int j = 0; j < n; j++)
            {
                Thread.Sleep(1);
            }
            sw1.Stop();
            /*当计算开销小于切换开销时*/
            Stopwatch sw2 = Stopwatch.StartNew();
            int Index = 0;
            Parallel.For(0, n, i =>
            {
                Index++;
            });
            sw2.Stop();
            /*当计算开销小于切换开销时*/
            Stopwatch sw3 = Stopwatch.StartNew();
            for (int j = 0; j < n; j++)
            {
                Index++;
            }
            sw3.Stop();

            Stopwatch sw4 = Stopwatch.StartNew();
            Parallel.For(0, n, i =>
            {
            });
            sw4.Stop();

            Console.WriteLine(" 计算开销大于切换开销时总并行时间:"+sw.Elapsed);
            Console.WriteLine(" 计算开销大于切换开销时非并行时间:" + sw1.Elapsed);
            Console.WriteLine(" 计算开销小于切换开销时总并行时间:" + sw2.Elapsed);
            Console.WriteLine(" 计算开销小于切换开销时非并行时间:" + sw3.Elapsed);
            Console.WriteLine("                 估算纯切换时间:" + sw4.Elapsed);

        }
    }
}