Comments on: Flash/as3 custom namespaces and performance: the name qualifier is slow http://blog.controul.com/2009/03/the-name-qualifier-is-slow/ Elaborations on flash. Fri, 23 Sep 2011 08:04:26 -0700 hourly 1 http://wordpress.org/?v=3.1.3 By: hristo http://blog.controul.com/2009/03/the-name-qualifier-is-slow/comment-page-1/#comment-111 hristo Wed, 11 Nov 2009 21:36:32 +0000 http://blog.controul.com/?p=52#comment-111 @Nicolas, I'm overwhelmed with stuff right now, so can't really make it. But you go for it, include any content you want in the wiki. I'll give it an eyeball one of those days, promised. @Mims H. Wright, the "uri" variation would be an interesting thing to check - I bet its just as quick as use namespace namespaceReference, as in as3 two namespace objects with the same url equate ... curious though. I'm not sure I can make the check anytime soon though, so if you could pull the sources and run the check for us, and then even post back - well, that would be nice. @Nicolas, I’m overwhelmed with stuff right now, so can’t really make it. But you go for it, include any content you want in the wiki. I’ll give it an eyeball one of those days, promised.
@Mims H. Wright, the “uri” variation would be an interesting thing to check – I bet its just as quick as use namespace namespaceReference, as in as3 two namespace objects with the same url equate … curious though. I’m not sure I can make the check anytime soon though, so if you could pull the sources and run the check for us, and then even post back – well, that would be nice.

]]> By: Nicolas http://blog.controul.com/2009/03/the-name-qualifier-is-slow/comment-page-1/#comment-110 Nicolas Thu, 05 Nov 2009 22:57:08 +0000 http://blog.controul.com/?p=52#comment-110 Hi Hristo, I just started adding AS performance tests into a wiki about 3 days ago, would be cool to add this one in as well. http://nicolasschudel.name/actionscript-performance-wiki/Main_Page Hi Hristo, I just started adding AS performance tests into a wiki about 3 days ago, would be cool to add this one in as well.

http://nicolasschudel.name/actionscript-performance-wiki/Main_Page

]]> By: Mims H. Wright http://blog.controul.com/2009/03/the-name-qualifier-is-slow/comment-page-1/#comment-109 Mims H. Wright Thu, 05 Nov 2009 21:16:14 +0000 http://blog.controul.com/?p=52#comment-109 What are the results when you implicitly use a namespace by importing it or if you do 'use namespace "uri";'? What are the results when you implicitly use a namespace by importing it or if you do ‘use namespace “uri”;’?

]]> By: hristo http://blog.controul.com/2009/03/the-name-qualifier-is-slow/comment-page-1/#comment-9 hristo Tue, 07 Apr 2009 06:41:54 +0000 http://blog.controul.com/?p=52#comment-9 I don't think the jit does any lazy execution optimizations; I will look into that again. EDIT: I reran the test with <code> use namespace testns; value = value + 1; //and testns::value = testns::value + 1; </code> Now it gets and sets the variable: hence no way for the loop to be jitted-out (even if the avm2 jit WERE doing such heavy optimisation, I have little doubt that it doesn't.) So results, in release fp10 and on the same machine, are as follows: Accessing a property in a custom namespace. > Running test @ 1000000 iterations ... Execution took 0.004 seconds. Accessing a property in a custom namespace with the :: name qualifier. > Running test @ 1000000 iterations ... Execution took 0.501 seconds. Again, you see that the time it takes for the name qualifier to do its job twice is double. It's true that the other stuff is just suspiciously quick; but hey, that's very good. Why don't you play around with the test and see what happens? Share back. I don’t think the jit does any lazy execution optimizations; I will look into that again.

EDIT:
I reran the test with

use namespace testns;
value = value + 1;
//and
testns::value = testns::value + 1;

Now it gets and sets the variable: hence no way for the loop to be jitted-out (even if the avm2 jit WERE doing such heavy optimisation, I have little doubt that it doesn’t.)
So results, in release fp10 and on the same machine, are as follows:

Accessing a property in a custom namespace.
> Running test @ 1000000 iterations …
Execution took 0.004 seconds.
Accessing a property in a custom namespace with the :: name qualifier.
> Running test @ 1000000 iterations …
Execution took 0.501 seconds.

Again, you see that the time it takes for the name qualifier to do its job twice is double. It’s true that the other stuff is just suspiciously quick; but hey, that’s very good. Why don’t you play around with the test and see what happens? Share back.

]]> By: Ralph http://blog.controul.com/2009/03/the-name-qualifier-is-slow/comment-page-1/#comment-8 Ralph Tue, 07 Apr 2009 04:13:40 +0000 http://blog.controul.com/?p=52#comment-8 For the fast case, about 3ns per iteration, is the jit really giving you that or has it managed to optimise away the loop entirely? For the fast case, about 3ns per iteration, is the jit really giving you that or has it managed to optimise away the loop entirely?

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