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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 ("YieldAddXToEven on {0} with {1} repeats ... ", COUNT, REPEAT);
  25. 			for (int i = 0; i < REPEAT; i++) {
  26. 				result = YieldAddXToEven (buffer, i);
  27. 			}
  28. 			sw.Restart ();
  29. 			for (int i = 0; i < REPEAT; i++) {
  30. 				result = YieldAddXToEven (buffer, i);
  31. 			}
  32. 			sw.Stop ();
  33. 			Console.WriteLine ("{0}", sw.Elapsed);
  34.  
  35. 			Console.Write ("SQLAddXToEven on {0} with {1} repeats ... ", COUNT, REPEAT);
  36. 			for (int i = 0; i < REPEAT; i++) {
  37. 				result = SQLAddXToEven (buffer, i);
  38. 			}
  39. 			sw.Restart ();
  40. 			for (int i = 0; i < REPEAT; i++) {
  41. 				result = SQLAddXToEven (buffer, i);
  42. 			}
  43. 			sw.Stop ();
  44. 			Console.WriteLine ("{0}", sw.Elapsed);
  45.  
  46. 			Console.Write ("LinqAddXToEven2Loops on {0} with {1} repeats ... ", COUNT, REPEAT);
  47. 			for (int i = 0; i < REPEAT; i++) {
  48. 				result = LinqAddXToEven2Loops (buffer, i);
  49. 			}
  50. 			sw.Restart ();
  51. 			for (int i = 0; i < REPEAT; i++) {
  52. 				result = LinqAddXToEven2Loops (buffer, i);
  53. 			}
  54. 			sw.Stop ();
  55. 			Console.WriteLine ("{0}", sw.Elapsed);
  56.  
  57. 			Console.Write ("LinqAddXToEven3Loops on {0} with {1} repeats ... ", COUNT, REPEAT);
  58. 			for (int i = 0; i < REPEAT; i++) {
  59. 				result = LinqAddXToEven3Loops (buffer, i);
  60. 			}
  61. 			sw.Restart ();
  62. 			for (int i = 0; i < REPEAT; i++) {
  63. 				result = LinqAddXToEven3Loops (buffer, i);
  64. 			}
  65. 			sw.Stop ();
  66. 			Console.WriteLine ("{0}", sw.Elapsed);
  67. 		}
  68.  
  69. 		static IEnumerable<string> LinqAddXToEven3Loops (IEnumerable<int> buffer, int x)
  70. 		{
  71. 			return buffer.Where (n => (n % 2) == 0).Select (n => n + x).Select (n => string.Format("Hello {0}", n));
  72. 		}
  73.  
  74. 		static IEnumerable<string> LinqAddXToEven2Loops (IEnumerable<int> buffer, int x)
  75. 		{
  76. 			return buffer.Where (n => (n % 2) == 0).Select (n => string.Format("Hello {0}", n + x));
  77. 		}
  78.  
  79. 		static IEnumerable<string> SQLAddXToEven (IEnumerable<int> buffer, int x)
  80. 		{
  81. 			return from n in buffer
  82. 			       where (n % 2) == 0
  83. 			       select string.Format ("Hello {0}", n + x);
  84. 		}
  85.  
  86. 		static IEnumerable<string> YieldAddXToEven (IEnumerable<int> buffer, int x)
  87. 		{
  88. 			foreach (var n in buffer) {
  89. 				if ((n % 2) == 0) {
  90. 					yield return string.Format ("Hello {0}", n + x);
  91. 				}
  92. 			}
  93. 		}
  94. 	}
  95. }
  96.  
Success #stdin #stdout 0.07s 24024KB
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Benchmarking Linq Loops
YieldAddXToEven on 1000 with 10000 repeats ... 00:00:00.0005988
SQLAddXToEven on 1000 with 10000 repeats ... 00:00:00.0020347
LinqAddXToEven2Loops on 1000 with 10000 repeats ... 00:00:00.0014414
LinqAddXToEven3Loops on 1000 with 10000 repeats ... 00:00:00.0018629
https://ideone.com/mnSxgb
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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