Re: NSCalendarDate to be deprecated
Re: NSCalendarDate to be deprecated
- Subject: Re: NSCalendarDate to be deprecated
- From: Tom Bernard <email@hidden>
- Date: Wed, 27 Aug 2008 12:41:17 -0600
- Thread-topic: NSCalendarDate to be deprecated
Please do jump in late, especially with a 20 microsecond suggestion. Full
details are at
http://bersearch.com/PrivateTechSupport/NSCalendarBenchmark/NSCalendarBench
mark1.0.zip
I have filed a bug report titled
Planned NSCalendarDate deprecation yields slower performance
Bug ID# 6179834
Thanks again to you and to Eliza Block for your suggestions.
++ Tom
Tom Bernard
email@hidden
on 8/22/08 12:00 AM, Ryan McGann at email@hidden wrote:
>> As written, 70 microseconds. When I set the calendar's time zone to
>> GMT, the
>> time drops to 43 microseconds. Since my app will only work with
>> dates in
>> GMT, this is a plus. Even so, 40 microseconds is far slower than the
>> 7 - 8
>> microseconds offered by -[NSCalendarDate dayOfYear]. Unless someone
>> has
>> another offering, I plan to file a bug report on this issue. This
>> calculation is part of an animation loop, so the performance hit is
>> important.
> Sorry to jump in late, but I am just now getting around to reading
> about 5 days worth of email. Did you try caching the NSCalendar
> creation call? I believe we had a similar performance issue with
> CFCalendar (which no doubt shares its implementation with NSCalendar),
> and I found out with Shark and fs_usage that each CFCalendarCreate
> call results in many (very large) region data files being read into
> memory. <sarcasm>Turns out reading several megabytes from the
> filesystem is expensive</sarcasm>, so caching the CFCalendarCreate
> resulted in a big performance gain. Not sure if NSCalendar implements
> any caching on its own, but you might give it a shot.
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