NSURLConnection on iPhone
NSURLConnection on iPhone
- Subject: NSURLConnection on iPhone
- From: Matthew Rushton <email@hidden>
- Date: Sat, 27 Dec 2008 20:24:30 -0800 (PST)
A bunch of issues have come up when trying to implement NSURLConnection on the iPhone and they are all performance related. My basic setup is that I'm downloading images via http requests and I need to do it as fast as possible. For each image I'm sending a request via NSURLConnection and using the delegate callbacks, it is single threaded. I had been using a tcp connection and the low level socket api which was working well but had some other unrelated issues (also was single threaded). With NSURLConnection I'm getting about half the throughput. I would expect a slight decrease given the fact that tcp connections may need to be set up on occassion but I think it should be small and I am using keep-alive to mitigate this. There seems to be some latency issues that are causing tcp to misbehave. I'm seeing a good amount of TCP retransmissions. I'm trying to
figure out why exactly this is so much slower than my old method, and what about NSURLConnection would cause the different TCP behavior I am seeing. I do know that the Maps app on the iPhone uses http requests and it is quite fast so I don't think it's because of that. Any insight or thoughts would be welcome! Thanks.
-Matt
--- On Mon, 12/22/08, Matthew Rushton <email@hidden> wrote:
From: Matthew Rushton <email@hidden>
Subject: Re: CFHttpMessage and keep-alive
To: "Jens Alfke" <email@hidden>
Cc: email@hidden
Date: Monday, December 22, 2008, 10:49 AM
Cool, that looks like what I wanted. Thanks!
-Matt
--- On Sun, 12/21/08, Jens Alfke <email@hidden> wrote:
> From: Jens Alfke <email@hidden>
>
Subject: Re: CFHttpMessage and keep-alive
> To: email@hidden
> Cc: email@hidden
> Date: Sunday, December 21, 2008, 1:31 AM
> On Dec 20, 2008, at 8:43 AM, Matthew Rushton wrote:
>
> > I clearly could serialize the requests and open a
> socket much like I am now but what I'm looking for is a
> simpler approach that hid the details in the background. Is
> there anyway doing something more along these lines could
> work with keep-alive
>
> Use NSURLConnection; that's the high-level HTTP API. It
> handles pretty much everything for you, including
> keep-alive, and it's easier to use than CFStream.
>
> —Jens
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