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  1. using System;
  2. using System.Diagnostics;
  3. using System.Text;
  4. //using System.Runtime.CompilerServices;
  5. namespace ConsoleApp
  6. {
  7.  
  8.     public class Program
  9.     {
  10.         const int iterations = 1000 * 1000 * 1;
  11.  
  12.         static void Main()
  13.         {
  14.             // JIT precompile
  15.             int x = 0;
  16.             //Unsafe(&x, 1);
  17.             Safe(new int[1], 1);
  18.             SafeJI(new int[1], 1);
  19.  
  20.             int size = 1024;
  21.             int[] array = new int[size];
  22.  
  23.             var sw = new Stopwatch();
  24.  
  25.             //sw.Restart();
  26.             //fixed (int* ptr = array)
  27.             //{
  28.             //    Unsafe(ptr, array.Length);
  29.             //}
  30.             //sw.Stop();
  31.             //Console.WriteLine("Unsafe:\t{0}", sw.Elapsed);
  32.  
  33.             sw = Stopwatch.StartNew();
  34.             SafeJI(array, array.Length);
  35.             sw.Stop();
  36.             Console.WriteLine("SafeJI:\t{0}", sw.Elapsed);
  37.  
  38.             sw = Stopwatch.StartNew();
  39.             Safe(array, array.Length);
  40.             sw.Stop();
  41.             Console.WriteLine("Safe  :\t{0}", sw.Elapsed);
  42.  
  43.  
  44.             //Console.ReadLine();
  45.         }
  46.  
  47.         //static unsafe void Unsafe(int* array, int n)
  48.         //{
  49.         //    for (int i = 0; i < n; i++)
  50.         //        for (int j = 0; j < iterations; j++)
  51.         //            array[i] = i;
  52.         //}
  53.  
  54.         static void Safe(int[] array, int n)
  55.         {
  56.             for (int i = 0; i < n; i++)
  57.                 for (int j = 0; j < iterations; j++)
  58.                     array[i] = i;
  59.         }
  60.         static void SafeJI(int[] array, int n)
  61.         {
  62.             for (int j = 0; j < iterations; j++)
  63.                 for (int i = 0; i < n; i++)
  64.                     array[i] = i;
  65.         }
  66.     }
  67. }
Success #stdin #stdout 2.73s 33896KB
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stdin
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Standard input is empty
stdout
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SafeJI:	00:00:01.4092746
Safe  :	00:00:01.2842751
https://ideone.com/EGnHrA
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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