How can I tell how computationally expensive a class or method is?
I've never been this far from the metal. Is there a corpus
somewhere listing this, or do programmers just know these things
from their experience?
Hi Kevin,
I recommend running Shark for tasks really want to inspect. It i
From: Chris Williams
> In 25 years in the computer business, I've seen precisely one
example of
> someone successfully re-coding around performance issues with the
language
> or library. And that was only because they coded a tiny snippet of
> assembler that managed to fit into the pre-fe
Ben Trumbull,
Thank you for sharing your experiences on the subject in extent!
Regards,
Justin
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On Jan 18, 2009, at 8:23 PM, Bill Bumgarner wrote:
On Jan 18, 2009, at 6:05 PM, Justin Carlson wrote:
I have also seen (unspecified) system libraries worsen considerably
over time - 'faster over the course of OS releases' is not as sunny
as I once believed. Believing system libr
On Jan 18, 2009, at 7:36 PM, Greg Titus wrote:
On Jan 18, 2009, at 5:13 PM, Justin Carlson wrote:
Jean-Daniel Dupas wrote:
>
> Each time you use KVC/KVO.
Hi Jean-Daniel,
Sorry if I misreading this, your response was short - it could mean
a few things. I am inclined to think yo
On Jan 18, 2009, at 7:20 PM, mmalc Crawford wrote:
On Jan 18, 2009, at 5:13 PM, Justin Carlson wrote:
I would generally write:
- (void)setMovie:(MyMovie *)newMovie {
// make sure it is ok here
In general your accessors should not perform validation; instead you
should implement the
>I've been watching this discussion w/great interest. Thanks.
>
> A lot of the discussion seems to be focused on micro-optimizations
and little focused on systemic optimizations.
>
> One point that I have yet to see mentioned is the overall
performance enhancements to be had by focusi
Jean-Daniel Dupas wrote:
> > An additional problem is that it does not scale well. Programs
mature,
> > objects are used beyond their initial intent, programmers come
and go
> > and that source becomes a nightmare to maintain. Getting back to
good
> > OO style, why take the messaging overh
Quincey Morris wrote:
> TBH (and more to the point) I strongly suspect it's true of
everyone who's
> expressed an opinion in this thread that it's not so much about the
> suitability of the language to optimizations, but more about the
skill
> set of the individual with regard to the langu
John Engelhart wrote:
> On Sat, Jan 17, 2009 at 7:44 PM, Scott Ribe wrote:
> >> TBH (and more to the point) I strongly suspect it's true of
everyone
> >> who's expressed an opinion in this thread that it's not so much
about
> >> the suitability of the language to optimizations, but more abou
Michael Ash wrote:
> > I would (personally) rather avoid caching selectors and debugging/
maintaining a
> > program that used that behaviour when a well tested alternatives
are built
> > into another language's model.
>
> I agree that it's ugly, but it's good to have the option.
Agreed.
> M
Michael Ash wrote:
Note that dispatch is not mandatory in ObjC either. It is possible
(you get little help from the compiler, but it's not hard) to use
either a vtable approach or a straight function call for method
invocation, as long as you don't mind the loss in functionality that
this implie
Note no one that responded to Jens is stating that the Objective-C way
of doing message dispatching cannot cause performance critical
pathways to be "hotter" then desired compared to direct function
calls, C++ vtable dispatching, etc. The point has been that just don't
assume that is the source of
Sorry if I come across as the devil's advocate on this one - I think
there should be another voice stating that objc use can slow a program.
Compared to C or C++, Objective C is a poor choice for performance
critical code. Within performance critical zones, I will only use objc
objects fo
Hello all,
I'm having a devil of a time trying to figure out what seems to be a
pretty basic scenario: declaring a multidimensional array in the
interface section of a class when the array dimensions are unknown
until runtime. Can anyone point me in the right direction with this
one?
Hi Don,
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