On Sep 23, 2009, at 2:27 PM, Matt Gough wrote:
I have an NSEnumerator iterating over an NSMutableArray like so:
NSEnumerator *iter = [myMutableArray objectEnumerator];
while (syncInfo = [iter nextObject]) {
... Do some stuff
}
Upon instrumenting it, I noticed that nextObject was taking over 60%
of the time, and most of that time is futzing around seemingly
calling __CFArrayCopyDescription.
1438 -[MyObj cleanSyncList]
1319 -
[__NSFastEnumerationEnumerator nextObject]
1319
__NSFastEnumerationMutationHandler
1239 CFCopyDescription
You have a bug. Check your console log: it's filling up with warnings
that you mutated the collection during enumeration. That's not allowed
with NSEnumerator.
I presume that if I swapped this for a simple :
for (i = 0; i < [myMutableArray count]; ++i) {
syncInfo =[myMutableArray objectAtIndex:i];
.....etc etc
}
it would speed up enormously.
It might be faster, but it might be just as buggy if you still change
the array during the loop.
--
Greg Parker gpar...@apple.com Runtime Wrangler
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