Scott Hanselman's Computer Zen - Hanselminutes on Channel 9 - Video #2

Scott Hanselman's Computer Zen - Hanselminutes on Channel 9 - Video #2 — Wed, 04 Apr 2007 00:42:17 GMT

PingBack from http://www.hanselman.com/blog/HanselminutesOnChannel9Video2.aspx

re: Drilling into .NET Runtime microbenchmarks: 'typeof' optimizations.

metafedora — Mon, 05 Feb 2007 21:22:30 GMT

After reading your post, I started wondering about the use of GetType in the implementation of our solution, in which we cache object references in a HashTable using the Name of the Type as a Key. I need some more time to examine your TypePerfMeasurement example, but in the meantime I wrote some code to check the performance of a few methods. I found that TypeHandle property was actually much slower than using the GetType() method, or the GetTypeHandle method -- here is sample output (using Debug build, Release was similar but slightly faster overall):

Using Type.GetTypeHandle

Time elapsed: 1187.5ms

Using typeof().TypeHandle

Time elapsed: 5296.875ms

Using typeof().GetType()

Time elapsed: 1171.875ms

Here is the code I used to generate these results:

using System;

namespace test_typehandle

{

internal class BaseClass{}

internal class SubClass : BaseClass{}

class Program

{

static void Main(string[] args)

{

int begin = 0;

int end = 10000000;

int counter = begin;

DateTime start = DateTime.Now;

string key = string.Empty;

BaseClass baseClass = new BaseClass();

SubClass subClass = new SubClass();

for (counter = begin; counter < end; counter++)

{

key = GetKeyByTypeDotGetTypeHandle(baseClass);

key = GetKeyByTypeDotGetTypeHandle(subClass);

}

OutputResults("Using Type.GetTypeHandle", start);

start = DateTime.Now;

for (counter = begin; counter < end; counter++)

{

key = GetKeyByTypeHandle<BaseClass>();

key = GetKeyByTypeHandle<SubClass>();

}

OutputResults("Using typeof().TypeHandle", start);

start = DateTime.Now;

for (counter = begin; counter < end; counter++)

{

GetKeyByType<BaseClass>();

GetKeyByType<SubClass>();

}

OutputResults("Using typeof().GetType()", start);

}

static void OutputResults(string method, DateTime start)

{

TimeSpan elapsed = DateTime.Now.Subtract(start);

Console.WriteLine(method);

Console.WriteLine(string.Format("Time elapsed: {0}ms", elapsed.TotalMilliseconds));

}

static string GetKeyByTypeDotGetTypeHandle(object obj)

{

return Type.GetTypeHandle(obj).ToString();

}

static string GetKeyByTypeHandle<T>()

{

return typeof(T).TypeHandle.Value.ToString();

}

static string GetKeyByType<T>()

{

return typeof(T).GetType().ToString();

}

RuntimeTypeHandle « Daily Curmudgeonry

RuntimeTypeHandle « Daily Curmudgeonry — Tue, 21 Nov 2006 00:48:21 GMT

PingBack from http://projectshave.wordpress.com/2006/11/20/runtimetypehandle/