This page has been translated using an automatic translation service and the translation may not be very accurate.

Comparazione of the performance in I use of stringhe (English)

If you use this code and feel it is a useful tool, consider making a donation (through PayPal) to help support the project. You can donate as little or as much as you wish, any amount is greatly appreciated!

For the original Italian page, please click on the link: http://www.guru4.net/articoli/string-performance/default.aspx

They will come considered 7 various relative implementazioni to the cyclical concatenation of stringhe, verifying for every case the times of elaboration demands and increasing the number for concatenations from 200 until 100.000; in every cycle it will have to be put in line tightens it "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".

To - pure concatenation of stringhe in JScript

Implemented like of continuation:


		<%@Language="JScript"%>

		<html>

		<body>

		<%

		var loops = 200;

		var txt = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 ";

		var t = new Date().getTime();

		

		var s = "";

		for(var i = 1; i < loops; i  )

		    s  = txt;

		Response.Write(s);

		

		Response.Write("<hr>Tempo esecuzione "   loops   " cicli: "   ((new Date().getTime()) - t)   " ms");

		%>

		</body>

		</html>

B - I use repeated of Response.Write in JScript

Implemented like of continuation:


		<%@Language="JScript"%>

		<html>

		<body>

		<%

		var loops = 200;

		var txt = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 ";

		var t = new Date().getTime();

		

		for(var i = 1; i < loops; i  )

		    Response.Write(txt);

		

		Response.Write("<hr>Tempo esecuzione "   loops   " cicli: "   ((new Date().getTime()) - t)   " ms");

		%>

		</body>

		</html>

C - I use of Array in JScript

Implemented like of continuation:


		<%@Language="JScript"%>

		<html>

		<body>

		<%

		var loops = 200;

		var txt = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 ";

		var t = new Date().getTime();

		

		var a = new Array();

		for(var i = 1; i < loops; i  )

		    a[a.length] = txt;

		Response.Write(a.join(""));

		

		Response.Write("<hr>Tempo esecuzione "   loops   " cicli: "   ((new Date().getTime()) - t)   " ms");

		%>

		</body>

		</html>

D - pure concatenation of stringhe in VBScript

Implemented like of continuation:


		<%@Language="VBScript"%>

		<%

		Option Explicit

		%>

		<html>

		<body>

		<%

		Dim loops

		Dim txt

		Dim t

		Dim i

		

		loops = 200

		txt = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 "

		t = Timer()

		

		Dim s

		s = ""

		For  i = 1 To loops

		    s = s & txt

		Next

		Response.Write(s)

		

		Response.Write("<hr>Tempo esecuzione " & loops & " cicli: " & Round((Timer() - t)*1000, 0) & " ms")

		%>

		</body>

		</html>

And - I use repeated of Response.Write in VBScript

Implemented like of continuation:


		<%@Language="VBScript"%>

		<%

		Option Explicit

		%>

		<html>

		<body>

		<%

		Dim loops

		Dim txt

		Dim t

		Dim i

		

		loops = 200

		txt = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 "

		t = Timer()

		

		For i = 1 To loops

		    Response.Write(txt)

		Next

		

		Response.Write("<hr>Tempo esecuzione " & loops & " cicli: " & Round((Timer() - t)*1000, 0) & " ms")

		%>

		</body>

		</html>

F - I use of Array in VBScript

Implemented like of continuation:


		<%@Language="VBScript"%>

		<%

		Option Explicit

		%>

		<html>

		<body>

		<%

		Dim loops

		Dim txt

		Dim t

		Dim i

		

		loops = 200

		txt = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 "

		t = Timer()

		

		Dim a

		a = Array()

		For i = 1 To loops

		    ReDim Preserve a(Ubound(a)   1)

		    a(UBound(a)) = txt

		Next

		Response.Write(Join(a, ""))

		

		Response.Write("<hr>Tempo esecuzione " & loops & " cicli: " & Round((Timer() - t)*1000, 0) & " ms")

		%>

		</body>

		</html>

G - I use of Array (previously determine the proportions) in VBScript

Implemented like of continuation:


		<%@Language="VBScript"%>

		<%

		Option Explicit

		%>

		<html>

		<body>

		<%

		Dim loops

		Dim txt

		Dim t

		Dim i

		

		loops = 200

		txt = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 "

		t = Timer()

		

		Dim a

		a = Array(loops)

		ReDim a(loops)

		For i = 0 To loops

		    a(i) = txt

		Next

		Response.Write(Join(a, ""))

		

		Response.Write("<hr>Tempo esecuzione " & loops & " cicli: " & Round((Timer() - t)*1000, 0) & " ms")

		%>

		</body>

		</html>

It turns out to you

The following table extension the detail of the times of execution (expressed in milliseconds) finds to you:

loop	To	B	C	D	And	F	G
200 *	10	0	0	0	0	0	0
500	30	10	0	31	0	0	0
1000	100	10	0	78	0	8	0
1500	271	20	10	200	0	20	12
2000	701	20	20	629	8	23	12
2500	1332	30	20	1145	8	39	12
3000	2083	40	30	1961	8	50	19
3500	3204	40	40	3145	12	50	19
4000	4716	40	40	4855	12	78	19
4500	6309	50	60	6398	12	98	31
5000	8633	50	60	8785	20	109	31
5500	10666	60	70	11145	20	121	39
6000	13039	70	80	13680	20	128	42
6500	16073	70	80	17043	20	148	43
7000	18958	80	90	20086	20	152	43
7500	22502	80	90	23605	20	160	43
8000	26228	90	100	27551	20	238	46
8500	29993	100	110	31996	27	242	50
9000	33809	100	120	36102	31	257	58
9500	38155	100	120	40551	31	280	62
10000	43292	110	130	46746	31	280	62
50000 *	> 90000	470	651	> 90000	160	3074	351
100000 *	> 90000	951	1412	> 90000	250	5257	703

The following figure introduces the values of the table in graphical format.
FAMOUS: the lines marked with * will not come considered in the graphical rappresentazione

Graphical visualization of the recorded
performances

The next figure extension the same diagram but with the axis of the times (y) in logaritmica scale:

Graphical visualization of the performances recorded
with the times in logaritmica scale

Conclusions

The solution 1 (normal concatenation of stringhe) turns out to be onerosa, with a esponenziale increase of the times of execution to increasing of the dimension of tightens manipulated.
The solution 2 (Response.Write) does not turn out always possible as an example (in case the scope of the concatenation is not to send of the result to the client), seppur offers elevated performances.
Solution 3 (I use of Array) allows the same potentialities of the normal concatenation of stringhe but it turns out very more efficient, allowing optimal and constant performances also to increasing of the dimensions of tighten dealt.

It turns out to you are independent from the language (VBScript or JScript) used