Re: NSURLConnection: "Greedy Memory Eater" and Error 303
Re: NSURLConnection: "Greedy Memory Eater" and Error 303
- Subject: Re: NSURLConnection: "Greedy Memory Eater" and Error 303
- From: glenn andreas <email@hidden>
- Date: Fri, 09 Sep 2011 09:15:39 -0500
On Sep 9, 2011, at 6:06 AM, Andreas Grosam wrote:
> Dir Members,
>
> I'm trying to use a NSURLConnection to download a large data file (>10 MB) from a web service to the iPhone. Currently, testing on iOS 4.2.1, on a device. The connection is established over WIFI.
>
> The problem I get with NSURLConnection is, that it internally uses a lot (really a lot) memory for its data buffers. It seems, the connection reads as much data as it can from the network and a tries to safe it in internal buffers, no matter what, apparently until the system cannot provide more memory.
>
> In a simple test app, NSURLConnections quite quickly consumes up to 10Mbyte for a number of its buffers - on the iPhone!, which is probably the maximum before the app will be killed. With Instruments, it can be viewed quite easily.
For another datapoint, I've got an app that can (optionally) download a 12.9MB data file which uses NSURLConnection, and it works fine - no threading, just the standard asynch delegate callbacks. I need to make sure that I'm accumulating the data in a file instead of in memory (in connection:didReceiveData:), but there's no problem with crashing or other weird errors.
Glenn Andreas email@hidden
The most merciful thing in the world ... is the inability of the human mind to correlate all its contents - HPL
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