Re: (Dis)Proving that 303s have a performance impact.

hi,

if as "ferrari" constantly drives at 50mph and an old eastern german
"trabant" [1] constantly drives at 50mph it can be concluded that
ferraris and trabants are the same in performance.

q.e.d.

:-D 

wkr j

[1] http://en.wikipedia.org/wiki/Trabant


On Sat, 2013-02-16 at 19:48 +0100, Henry Story wrote:
> On 16 Feb 2013, at 19:26, Kingsley Idehen <kidehen@openlinksw.com> wrote:
> > On 2/16/13 1:11 PM, Henry Story wrote:
> >> On 16 Feb 2013, at 18:37, Kingsley Idehen <kidehen@openlinksw.com> wrote:
> >>> Yes, its got to be so simple that it won't take you time to make the entire experiment, and then present a set of conclusions drawn from your observations etc..
> >> What is the experminent we need to do? Can you describe it?
> > 
> > I don't have time for games. You outlined a set of claims upon which you've arrived at disputed conclusions. Thus, you already know the description of your experiment since you are the very same person that's provided its hypothesis.
> 
> Ok, so we need to compare like with like, in order to be able to have an expermiment.
> So we put ourselves in a user's shoes. He has to choose between either hash WebID, 
> or a 303 WebID . He has the same information to publish in both cases 
> 
> Hash:          http://joe.example/hash/joe#me
> Non Hash:      http://joe.example/resource/joe
> 
> So we have the WebID and we need to get the WebID Profile document [1].
> Let us say the Profile document is of size S . 
> 
> A. Hash URL
> -----------
> 
> A.1 Client does an HTTP GET on 
>    http://joe.example/hash/joe
>  
> A.2 Client receives document of size S
> 
> 
> B. Non Hash URL
> ---------------
> 
> B.1 Client does an HTTP GET on 
>    http://joe.example/resource/joe
> 
> B.2 Client received a 303 redirect to 
>    http://joe.example/document/joe
> 
> B.3 Client does an HTTP GET on  
>     http://joe.example/document/joe
> 
> B.4 Client received content of size S
> 
> 
> Conclusion
> -----------
> 
> Given that the size of the documents are the same in both cases, and that we
> work with the same network speeds in order to remove accidental varations of speed,
> We see that B requires 1 more HTTP request to the server that A does.
> 
> Therefore the difference in speed between A and B is exactly the difference of 
> a message exchange. This difference will always exist no matter what the network
> setup.
> 
> The noticeability of this will vary depending on the distance of the client to the
> server, and the size of the document. But it will always exist. There is therfore
> an efficiency gain to be had by choosing the hash url for free.
> 
> Q.E.D.
> 
> Henry
> 
> [1] https://dvcs.w3.org/hg/WebID/raw-file/tip/spec/identity-respec.html
> [2] ISSUE-74
> 
> Social Web Architect
> http://bblfish.net/
> 

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Received on Saturday, 16 February 2013 19:30:05 UTC