Re: speed of alloc/init for NSNumber
Re: speed of alloc/init for NSNumber
- Subject: Re: speed of alloc/init for NSNumber
- From: mmalcolm crawford <email@hidden>
- Date: Sun, 18 Jan 2004 14:39:52 -0800
On Jan 18, 2004, at 1:49 PM, Daryn wrote:
It makes sense that I don't need to worry about speed with only four
hundred rows. It just seems like good practice to avoid or minimize
allocating memory in any loop. I have three or four other dictionary
keys that also require release and alloc/inits messages to be sent.
Also, I have another table that I'm about to start working on that
will have 25 to 40 thousand rows. I'm wondering at what point I need
to worry about the speed of these release and alloc/inits messages.
I personally think everyone should always be concerned by speed. There
is certainly a cost to needless messages, particularly
alloc/init/release. It's taxing to both the cpu and memory allocators,
which is readily apparent on older/slower machines. Optimization
shouldn't be taken to an extreme too early, but avoiding this trio of
messages is almost always a win.
Here, though, there's a trade-off between the frequency of conversion
between number objects and scalars for computation, and between scalars
and number objects for display -- so the question is which trio...
That being said, I have been dismayed by the absence of certain mutable
classes.
Have you filed an enhancement request...? :-)
mmalc
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