Comments on: Heap Feng Shui in JavaScript and HeapLib

By: rektide

rektide — Tue, 29 May 2007 21:58:04 +0000

array.join is and has always been the only reason my code runs at speed. thank you jeebus!

By: Abba Bryant

Abba Bryant — Mon, 07 May 2007 01:40:08 +0000

Interesting..
AVG blocks access to the main article on determina.com with the message indicating the page has a trojab horse by the name of “JS:DAO-Exploit [Trj]“.

By: DPP

DPP — Sat, 05 May 2007 11:03:22 +0000

@Jordan
I think there is memory leak in IE.
On 6000+ strings with overall length of 360Kb array.join version runs 20 times faster (18sec against 1sec) and use about 20Mb less memory on IE. ((timed using Date().getTime() on IE6sp2))
All other browsers don’t show any speed increase, and are 10 times faster then IE on array.join version. So, string concatenation in any browser is 200 times faster than in IE.

Anyway, inserting these 6000+ elements into DOM takes more time in any browser (and can’t be accurately timed).

By: Scott Schiller

Scott Schiller — Wed, 02 May 2007 22:16:13 +0000

Eric Lippert discusses garbage collection here.
http://blogs.msdn.com/ericlippert/archive/2003/09/17/53038.aspx
Some great comments here re: memory leaks, “what if”, the 95% case and dismissal of concerns (keep in mind this was 2003.) Heh.
CollectGarbage() is one of those fun MSDN undocumented methods.

By: Steve Kollars

Steve Kollars — Wed, 02 May 2007 18:03:03 +0000

My mind has just exploded!

And why have I never heard of CollectGarbage() before?

By: Dean Edwards

Dean Edwards — Wed, 02 May 2007 02:55:41 +0000

To free one of the strings we’ve allocated, we need to delete all references to it and run the garbage collector. Fortunately, we don’t have to wait for one of the heuristics to trigger it, because the JavaScript implementation in Internet Explorer provides a CollectGarbage() function which forces the garbage collector to run immediately.

CollectGarbage() !!!

By: Jordan

Jordan — Wed, 02 May 2007 01:42:21 +0000

Please excuse my lack of intelligence but after reading the description and the link supplied by Mr. Strangfeld, I still don’t understand why Array.join is better than string concatenation. Could some kind folk give me a quick explanation, please?

By: cloudno9

cloudno9 — Tue, 01 May 2007 23:12:07 +0000

Interesting article

By: Rich Strangfeld

Rich Strangfeld — Tue, 01 May 2007 15:17:39 +0000

Looks like it’s http://www.determina.com/security.research/presentations/bh-eu07/bh-eu07-sotirov-paper.html

By: elalecs

elalecs — Tue, 01 May 2007 15:13:04 +0000

And the link???

By: Dean Edwards

Dean Edwards — Tue, 01 May 2007 15:10:26 +0000

Can you provide a link to the original article please?