Re: NSKeyedArchiver finishEncoding takes forever
Re: NSKeyedArchiver finishEncoding takes forever
- Subject: Re: NSKeyedArchiver finishEncoding takes forever
- From: "Michael Ash" <email@hidden>
- Date: Wed, 18 Jun 2008 17:41:04 -0400
On Wed, Jun 18, 2008 at 5:17 PM, Markus Spoettl
<email@hidden> wrote:
> On Jun 18, 2008, at 1:59 PM, Quincey Morris wrote:
>>
>> Yes, but look at where the time is *really* being spent. At a guess,
>> finishEncoding is comparing every number object against every other number
>> object to see if it can archive just one object of each distinct numeric
>> value. With the number of objects you said you're using, this O(n**2)
>> optimization -- if that's what it's doing -- is hideously expensive.
>
>
> Exactly and the test data isn't particularly big. Any ideas how to tell the
> archiver not to do this with my doubles (that doesn't involve conversion to
> strings and back)?
Although it partially defeats the purpose of using NSCoder, you'll
avoid this whole path if you stuff all four doubles into a single
NSData. Don't forget to use the byte-swapping functions to ensure that
they all have a consistent representation across architectures.
Mike
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