8天玩转并行开发——第八天 用VS性能向导解剖你的程序

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Diagnostics;
 6 
 7 namespace Test
 8 {
 9     class Program
10     {
11         static object obj = new object();
12 
13         static void Main(string[] args)
14         {
15             var watch = Stopwatch.StartNew();
16 
17             var range = ParallelEnumerable.Range(1, 100000000);
18 
19             var query = (from n in range.AsParallel()
20                          where n % 5 == 0
21                          select Calculate(n)).Average();
22 
23             watch.Stop();
24 
25             Debug.WriteLine("耗费时间:{0}", watch.Elapsed);
26             Console.WriteLine("耗费时间:{0}", watch.Elapsed);
27         }
28 
29         /// <summary>
30         /// 模拟复杂的数学计算
31         /// </summary>
32         /// <param name="num"></param>
33         /// <returns></returns>
34         static double Calculate(int num)
35         {
36             lock (obj)
37             {
38                 var sqrt = Math.Sqrt(num);
39 
40                 var pow = Math.Pow(sqrt, 5);
41 
42                 var log10 = Math.Log10(pow);
43 
44                 var floor = Math.Floor(log10);
45 
46                 return floor;
47             }
48         }
49     }
50 }

 1         static double Calculate(int num)
 2         {
 3                 var sqrt = Math.Sqrt(num);
 4 
 5                 var pow = Math.Pow(sqrt, 5);
 6 
 7                 var log10 = Math.Log10(pow);
 8 
 9                 var floor = Math.Floor(log10);
10 
11                 return floor;
12         }