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c# 并行运算

c# 并行运算

1. Parallel.INVOKE() 看实例:

    private static Stopwatch watch = new Stopwatch();        private static void Run1()        {            Thread.Sleep(2000);            Console.WriteLine("Task 1 takes 2 sec");        }        private static void Run2()        {            Thread.Sleep(3000);            Console.WriteLine("Task 2 takes 3 sec");        }        static void Main(string[] args)        {            watch.Start();            Parallel.Invoke(Run1,Run2);            watch.Stop();            Console.WriteLine("Parallel run "+watch.ElapsedMilliseconds +" ms");                   watch.Restart();            Run1();            Run2();            watch.Stop();            Console.WriteLine("Normal run "+watch.ElapsedMilliseconds+" ms");            Console.ReadLine();

看结果:

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 2.Parallel.For

 看实例:

  watch.Start();            for (int i = 0; i < 10000; i++)            {                for (int j = 0; j < 5000; j++)                {                    int sum = 0;                    sum++;                }            }            watch.Stop();            Console.WriteLine("Normal run " + watch.ElapsedMilliseconds + "ms");            watch.Restart();            watch.Start();            Parallel.For(0, 1000, item =>              {                  for (int j = 0; j < 5000; j++)                  {                      int sum = 0;                      sum += item;                  }              });            watch.Stop();            Console.WriteLine("ParalleFor run " + watch.ElapsedMilliseconds + "ms");            Console.ReadLine();

 

看结果:

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是不是Parallel.For在任何时候都比for要快呢?答案当然是“不是”,要不然微软还留着for干嘛?

看实例:

 

c# 并行运算