On Feb 5, 2009, at 5:39 PM, harry greenmonster wrote:
while([inputString isMatchedByRegex:regexString]){
range = [inputString rangeOfRegex:regexString];
inputString = [inputString stringByReplacingCharactersInRange:range
withString:@""];
}
'inputString' is a 5mb text file, Activity Monitor shows that memory
increases by about 9mb per iteration. Which quickly becomes a
serious problem.
I'm a little confused as to why I have a problem. My understanding
is that 'inputString' (on the third line) is replaced by the
modified version of itself. I was expecting the memory footprint for
the app to reduce in size (if anything). Obviously I have the
concept fundamentally wrong in my head.
a pointer address when replaced by another address free's up the old
memory location it once pointed to, no?
No. The pointer merely stops pointing to what it used to.
If you are using garbage collection, then assigning the pointer _may_
make the object available for collection. I say "may" because the
existence of another pointer pointing to the same object may keep the
object around.
The thing is, the collector doesn't immediately collect everything
which is collectable. You can give it hints that it should collect at
certain points in your program.
If you're not using garbage collection, then the objects being created
in your loop are likely to be accumulating in the autorelease pool.
You should create a local autorelease pool within your loop, draining
it at the end of each iteration.
Regards,
Ken
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