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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Diagnostics;
  4. using System.Linq;
  5.  
  6. namespace ConsoleApplication58
  7. {
  8.     internal class Program
  9.     {
  10.         private class A
  11.         {
  12.  
  13.         }
  14.  
  15.         private static bool F<T>(T a, T b) where T : class
  16.         {
  17.             return a == b;
  18.         }
  19.  
  20.         private static bool F2(A a, A b)
  21.         {
  22.             return a == b;
  23.         }
  24.  
  25.         private static void Main()
  26.         {
  27.             const int rounds = 100, n = 10000000;
  28.             var a = new A();
  29.             var fList = new List<TimeSpan>();
  30.             var f2List = new List<TimeSpan>();
  31.             for (int i = 0; i < rounds; i++)
  32.             {
  33.                 //test generic
  34.                 GCClear();
  35.                 bool res;
  36.                 var sw = new Stopwatch();
  37.                 sw.Start();
  38.                 for (int j = 0; j < n; j++)
  39.                 {
  40.                     res = F(a, a);
  41.                 }
  42.                 sw.Stop();
  43.                 fList.Add(sw.Elapsed);
  44.  
  45.                 //test not-generic
  46.                 GCClear();
  47.                 bool res2;
  48.                 var sw2 = new Stopwatch();
  49.                 sw2.Start();
  50.                 for (int j = 0; j < n; j++)
  51.                 {
  52.                     res = F2(a, a);
  53.                 }
  54.                 sw2.Stop();
  55.                 f2List.Add(sw2.Elapsed);
  56.             }
  57.             double f1AverageTicks = fList.Average(ts => ts.Ticks);
  58.             Console.WriteLine("Elapsed for F = {0} \t ticks = {1}", fList.Average(ts => ts.TotalMilliseconds),
  59.                               f1AverageTicks);
  60.             double f2AverageTicks = f2List.Average(ts => ts.Ticks);
  61.             Console.WriteLine("Elapsed for F2 = {0} \t ticks = {1}", f2List.Average(ts => ts.TotalMilliseconds),
  62.                   f2AverageTicks);
  63.             Console.WriteLine("Not-generic method is {0} times faster, or on {1}%", f1AverageTicks/f2AverageTicks,
  64.                               (f1AverageTicks/f2AverageTicks - 1)*100);
  65.             Console.ReadKey();
  66.         }
  67.  
  68.         private static void GCClear()
  69.         {
  70.             GC.Collect();
  71.             GC.WaitForPendingFinalizers();
  72.             GC.Collect();
  73.         }
  74.     }
  75. }
  76.  
Success #stdin #stdout 1.83s 34016KB
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stdout
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Elapsed for F = 8.771168 	 ticks = 87711.68
Elapsed for F2 = 8.781697 	 ticks = 87816.97
Not-generic method is 0.998801029003847 times faster, or on -0.119897099615263%
https://ideone.com/Y1GIJK
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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