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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Diagnostics;
  4. using System.Linq;
  5.  
  6. namespace BenchLinqLoops
  7. {
  8. 	class MainClass
  9. 	{
  10. 		const int COUNT = 1000;
  11. 		const int REPEAT = 10000;
  12.  
  13. 		public static void Main (string[] args)
  14. 		{
  15. 			Console.WriteLine ("Benchmarking Linq Loops");
  16.  
  17. 			var buffer = new List<int> (COUNT);
  18. 			for (int i = 0; i < COUNT; i++) {
  19. 				buffer.Add (i);
  20. 			}
  21. 			IEnumerable<string> result;
  22. 			var sw = new Stopwatch ();
  23.  
  24. 			Console.Write ("LinqAddXToEven3Loops on {0} with {1} repeats ... ", COUNT, REPEAT);
  25. 			sw.Restart ();
  26. 			for (int i = 0; i < REPEAT; i++) {
  27. 				result = LinqAddXToEven3Loops (buffer, i);
  28. 			}
  29. 			sw.Stop ();
  30. 			Console.WriteLine ("{0}", sw.Elapsed);
  31.  
  32. 			Console.Write ("LinqAddXToEven2Loops on {0} with {1} repeats ... ", COUNT, REPEAT);
  33. 			sw.Restart ();
  34. 			for (int i = 0; i < REPEAT; i++) {
  35. 				result = LinqAddXToEven2Loops (buffer, i);
  36. 			}
  37. 			sw.Stop ();
  38. 			Console.WriteLine ("{0}", sw.Elapsed);
  39.  
  40. 			Console.Write ("SQLAddXToEven on {0} with {1} repeats ... ", COUNT, REPEAT);
  41. 			sw.Restart ();
  42. 			for (int i = 0; i < REPEAT; i++) {
  43. 				result = SQLAddXToEven (buffer, i);
  44. 			}
  45. 			sw.Stop ();
  46. 			Console.WriteLine ("{0}", sw.Elapsed);
  47.  
  48. 			Console.Write ("YieldAddXToEven on {0} with {1} repeats ... ", COUNT, REPEAT);
  49. 			sw.Restart ();
  50. 			for (int i = 0; i < REPEAT; i++) {
  51. 				result = YieldAddXToEven (buffer, i);
  52. 			}
  53. 			sw.Stop ();
  54. 			Console.WriteLine ("{0}", sw.Elapsed);
  55. 		}
  56.  
  57. 		static IEnumerable<string> LinqAddXToEven3Loops (IEnumerable<int> buffer, int x)
  58. 		{
  59. 			return buffer.Where (n => (n % 2) == 0).Select (n => n + x).Select (n => string.Format("Hello {0}", n));
  60. 		}
  61.  
  62. 		static IEnumerable<string> LinqAddXToEven2Loops (IEnumerable<int> buffer, int x)
  63. 		{
  64. 			return buffer.Where (n => (n % 2) == 0).Select (n => string.Format("Hello {0}", n + x));
  65. 		}
  66.  
  67. 		static IEnumerable<string> SQLAddXToEven (IEnumerable<int> buffer, int x)
  68. 		{
  69. 			return from n in buffer
  70. 			       where (n % 2) == 0
  71. 			       select string.Format ("Hello {0}", n + x);
  72. 		}
  73.  
  74. 		static IEnumerable<string> YieldAddXToEven (IEnumerable<int> buffer, int x)
  75. 		{
  76. 			foreach (var n in buffer) {
  77. 				if ((n % 2) == 0) {
  78. 					yield return string.Format ("Hello {0}", n + x);
  79. 				}
  80. 			}
  81. 		}
  82. 	}
  83. }
  84.  
Success #stdin #stdout 0.06s 24072KB
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Standard input is empty
stdout
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Benchmarking Linq Loops
LinqAddXToEven3Loops on 1000 with 10000 repeats ... 00:00:00.0184278
LinqAddXToEven2Loops on 1000 with 10000 repeats ... 00:00:00.0023821
SQLAddXToEven on 1000 with 10000 repeats ... 00:00:00.0026071
YieldAddXToEven on 1000 with 10000 repeats ... 00:00:00.0006225
https://ideone.com/SMCNG5
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
public

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