Attachment 190848 Details for Bug 354238

performance test case

switch.cs (text/x-csharp), 2.57 KB, created by Juraj Skripsky on 2008-01-17 14:14:50 UTC

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Creator: Juraj Skripsky

Created: 2008-01-17 14:14:50 UTC

Size: 2.57 KB

patch

obsolete

>using System;
>using System.Collections.Generic;
>
>class Test {
>	static void Main(string[] args) {
>		string s = args[0];
>
>		int runs = 100000;
>		long start;
>
>		for(int i = 0; i < runs; i++) {
>			DoSwitch(s);
>			DoDictSwitch(s);
>			String.IsInterned(s);
>		}
>
>		start = DateTime.Now.Ticks;
>		for(int i = 0; i < runs; i++)
>			DoSwitch(s);
>		Console.WriteLine("Switch:     {0}", DateTime.Now.Ticks - start);
>
>		start = DateTime.Now.Ticks;
>		for(int i = 0; i < runs; i++)
>			String.IsInterned(s);
>		Console.WriteLine("IsInterned: {0}", DateTime.Now.Ticks - start);
>		
>
>		s = String.Intern(s);
>		Console.WriteLine();
>		Console.WriteLine(" -- string is interned from now on --");
>		Console.WriteLine();
>
>		start = DateTime.Now.Ticks;
>		for(int i = 0; i < runs; i++)
>			String.IsInterned(s);
>		Console.WriteLine("IsInterned: {0}", DateTime.Now.Ticks - start);
>
>		start = DateTime.Now.Ticks;
>		for(int i = 0; i < runs; i++)
>			DoSwitch(s);
>		Console.WriteLine("Switch:     {0}", DateTime.Now.Ticks - start);
>		
>		start = DateTime.Now.Ticks;
>		for(int i = 0; i < runs; i++)
>			DoDictSwitch(s);
>		Console.WriteLine("DictSwitch: {0}", DateTime.Now.Ticks - start);
>	}
>		
>	static int DoSwitch(string s) {
>		switch(s) {
>			case "Hello":
>				return 0;
>			case "Hello World":
>				return 1;
>			case "I'm a switch":
>				return 2;
>			case "Test":
>				return 3;
>			case "optimize this":
>				return 4;
>			case "blah":
>				return 5;
>			case "abc":
>				return 6;
>			case "defghi":
>				return 7;
>			case "JKLMNOP":
>				return 8;
>			case "SomeTest":
>				return 9;
>			case "1234567890":
>				return 10;
>			case "Some really long long long string.":
>				return 11;
>			default:
>				return 12;
>		}
>	}
>	
>	static Dictionary<string, int> switchDict;
>	
>	static int DoDictSwitch(string s) {
>		if(switchDict == null) {
>			switchDict = new Dictionary<string, int>(12);
>			switchDict.Add("Hello", 0);
>			switchDict.Add("Hello World", 1);
>			switchDict.Add("I'm a switch", 2);
>			switchDict.Add("Test", 3);
>			switchDict.Add("optimize this", 4);
>			switchDict.Add("blah", 5);
>			switchDict.Add("abc", 6);
>			switchDict.Add("defghi", 7);
>			switchDict.Add("JKLMNOP", 8);
>			switchDict.Add("SomeTest", 9);
>			switchDict.Add("1234567890", 10);
>			switchDict.Add("Some really long long long string.", 11);
>		}
>		int i;
>		if(!switchDict.TryGetValue(s, out i))
>			return 12;
>		
>		switch(i) {
>			case 0: return 0;
>			case 1: return 1;
>			case 2: return 2;
>			case 3: return 3;
>			case 4: return 4;
>			case 5: return 5;
>			case 6: return 6;
>			case 7: return 7;
>			case 8: return 8;
>			case 9: return 9;
>			case 10: return 10;
>			case 11: return 11;
>			default: return 12;
>		}
>	}
>}

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Attachments on bug 354238: 190742 | 190743 | 190744 | 190848