Re: CATiledLayer Memory Usage
Re: CATiledLayer Memory Usage
- Subject: Re: CATiledLayer Memory Usage
- From: David Duncan <email@hidden>
- Date: Mon, 24 May 2010 10:05:12 -0700
On May 22, 2010, at 9:44 AM, Milen Dzhumerov wrote:
> I've been writing some code that uses CATiledLayer and noticed that the memory usage increased quite a bit - by a factor of 2, on average. Some numbers that I've collected:
> Normally Sized Window
> - NS: 10mb; CA: 18.5mb
> Maximized Window:
> - NS: 23mb; CA: 45.7mb
>
> I tried playing with the tile size and it looks like it has no effect on the memory usage. If I just used a normal CALayer, the memory consumption was somewhere in-between - an increase of about 1.5 with respect to the NS version. I just wanted to ask whether that's the expected behavior of CATiledLayer and whether I should be following any tips to keep that usage down as much as possible.
CATiledLayer keeps a cache of the tiles that is has requested, and as such will likely use more memory over the short to medium term than a plain CALayer. If memory pressure gets high enough this cache should be flushed however. What problem are you trying to solve and how are you determining memory usage?
--
David Duncan
Apple DTS Animation and Printing
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