初次接触并行运算

初次接触并行运算，感觉太强大了。

从最开始的Parallel.Invoke到现在的Parallel.For以及Parallel.Foreach，一步一步都看到了希望。。。

源码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Diagnostics;
using System.Security.Cryptography;
using System.Collections.Concurrent;

namespace ConsoleApplication1
{
    class Program
    {
        private const int NUM_AES_KEYS = 800000;
        static void Main(string[] args)
        {
            GenerateAESKeys();
            GenerateAESKeys1();
            ParallelPartitionGenerateAESKeys();
            Console.ReadLine();
        }
        private static void GenerateAESKeys()
        {
            Stopwatch sw = Stopwatch.StartNew();
            var aesM = new AesManaged();
            for (int i = 1; i <= NUM_AES_KEYS; i++)
            {
                aesM.GenerateKey();
                byte[] result = aesM.Key;
                string hexString = Convert.ToString(result);
            }
            Console.WriteLine("串行用时：" + Convert.ToInt64(sw.Elapsed.TotalMilliseconds));
        }
        private static void GenerateAESKeys1()
        {
            Stopwatch sw = Stopwatch.StartNew();
            Parallel.For(1, NUM_AES_KEYS + 1, (int i) =>
                {
                    var aesM = new AesManaged();
                    byte[] result = aesM.Key;
                    string hexString = Convert.ToString(result);
                });
            Console.WriteLine("Parallel.For并行用时：" + Convert.ToInt64(sw.Elapsed.TotalMilliseconds));
        }
        private static void ParallelPartitionGenerateAESKeys()
        {
            Stopwatch sw = Stopwatch.StartNew();
            Parallel.ForEach(Partitioner.Create(1, NUM_AES_KEYS + 1), range =>
                {
                    var aesM = new AesManaged();
                    for (int i = range.Item1; i < range.Item2; i++)
                    {
                        aesM.GenerateKey();
                        byte[] result = aesM.Key;
                        string hexString = Convert.ToString(result);
                    }
                });
            Console.WriteLine("Parallel.ForEach并行用时：" + Convert.ToInt64(sw.Elapsed.TotalMilliseconds));
        }
    }
}

 

 

运行结果：

串行用时：1982
Parallel.For并行用时：509
Parallel.ForEach并行用时：458