MOTOBIT.COM - ASP upload, IIS utility Multi Dictionary, Scripting Dictionary and ASP application Dictionary - Performance comparison Article

Description of the test

TestRndAdd - Add the number of random keys to the dictionary

  For I = 1 To Cycles
    D(key) = I
  Next

TestRndRead - Read the number of items of random keys from the dictionary

  For I = 1 To Cycles
    X = D(key)  
  Next

TestRndLock - Safe counter over several threads. Change dictionary value with locking. (Has no meaning for Scripting.Dictionary, which is single threaded)

  For I = 1 To Cycles
    D.Lock 
    D(Key) = D(Key) + 1
    D.Unlock
  Next

TestRndRemove - Remove all items from the dictionary with random keys

  For Each i In D 
    D.Remove I
  Next

TestRndExists - Exists of the key in dictionary (ASP application object does not have Exists method)

  For I = 1 To Cycles
    X = D.Exists(key)
  Next

Tested objects

Scripting.Dictionary - the default dictionary object created by MS for VBScript/JScript work. Single threaded dictionary.

  Set D = CreateObject("Scripting.Dictionary")

ASP application Dictionary - ASP object designed to share variables among all requests of a given ASP application. Free threaded object.

  Set D = Application.Contents

Multi Dictionary - Dictionary object with extended functionality designed to share variables among all threads of one process, between processes or computers. Free threaded object.

  Set D = CreateObject("Multi.Dictionary")

Results

For small number of keys and items Multi.Dictionary has the same performace as Application dictionary from ASP and Scripting Dictionary

For large number of keys, the performance of Multi.Dictionary has many times better than ASP Application object and better than Scripting.Dictionary.

Dictionary tests - 100000 keys

Operation	Scripting Dictionary	ASP Application Dictionary	Multi Dictionary	Multi - Better than Scripting	Multi - Better than ASP app
TestRndAdd	2 564,31ms	141 514,61ms	836,39ms	3,07x	169,20x
TestRndRead	8 838,35ms	166 922,63ms	799,67ms	11,05x	208,74x
TestRndLock	-	207 049,42ms	2 042,11ms	-	101,39x
TestRndRemove	2 798,35ms	63 733,91ms	1 126,47ms	2,48x	56,58x
TestRndExists	5 806,87ms	-	963,69ms	6,03x	-

Dictionary tests - 10000 keys

Operation	Scripting Dictionary	ASP Application Dictionary	Multi Dictionary	Multi - Better than Scripting	Multi - Better than ASP app
TestRndAdd	75,09ms	561,01ms	92,18ms	0,81x	6,09x
TestRndRead	97,06ms	1 136,60ms	68,47ms	1,42x	16,60x
TestRndLock	-	934,13ms	164,90ms	-	5,66x
TestRndRemove	66,50ms	547,91ms	102,90ms	0,65x	5,32x
TestRndExists	85,54ms	-	83,12ms	1,03x	-

Dictionary tests - 1000 keys

Operation	Scripting Dictionary	ASP Application Dictionary	Multi Dictionary	Multi - Better than Scripting	Multi - Better than ASP app
TestRndAdd	41,30ms	42,18ms	39,13ms	1,06x	1,08x
TestRndRead	40,88ms	42,06ms	39,65ms	1,03x	1,06x
TestRndLock	-	47,08ms	46,87ms	-	1,00x
TestRndRemove	37,42ms	41,65ms	40,71ms	0,92x	1,02x
TestRndExists	38,62ms	-	39,17ms	0,99x	-

Multi

Free-threaded (multithreaded) dictionary object. Lets you work with unique/non-unique keys in VBScript and JScript envinronment (share application/session variables in ASP) or any other programming language. You can share dictionary variables between processes or computers, you can save or restore dictionary variables to a disk, work with keys using regular expression and more.