Re: NSUserDefaults allocation size and CALayer memory usage
Re: NSUserDefaults allocation size and CALayer memory usage
- Subject: Re: NSUserDefaults allocation size and CALayer memory usage
- From: David Duncan <email@hidden>
- Date: Mon, 29 Jun 2015 09:57:00 -0700
> On Jun 28, 2015, at 11:35 PM, Henrik Granaas-Helmers <email@hidden> wrote:
>
> Hi there,
>
> I am new to Apple development, and new to this list. I have two questions about memory on OS X.
>
> 1. NSUserDefaults seems to allocate 16 MB memory at load. I can't see myself using a megabyte—let alone 16 of those. It would be very interesting to know why it allocates so much, and if there is a way to encourage NSUserDefaults to grab less.
>
> 2. I create a couple of CoreAnimation layers that I think are large (5120x2880 px). I would expect that to occupy 450 MB (5120*2880*32/1024/1024) of memory. But instead it only takes up one fourth of that. What is this sorcery?
You forgot to divide by 8 (you’re counting mega-bits, not mega-bytes).
>
>
> --
> Henrik Granaas-Helmers
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David Duncan
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