In-loop releasing of objects does not free memory?

FROM : Arthur C.
DATE : Tue Feb 12 23:10:16 2008

I am writing a Cocoa-program to reduce a large amount of measurement data.
This involves reading in large files, like 6 MB each, in a loop over about 60 of them.
I try to release as many temporary objects as possible whenever I'm finished with them. However, the memory is not freed, as can be seen using Activity monitor, and by a dramatic slowdown due to memory overflow.

So the question is, how can I get the memory back? I need it for the next file(s)...

Code looks like this:

NSArray * files; // contains a list of filenames
for(i=0;i<[files count]; i++)
{
  NSString * dataFromFile = [[NSString alloc] initWithContentsOfFile: [files objectAtIndex: i]];
  < some processing >
  [dataFromFile release];
}

Autoreleased instances behave the same, i.e. no memory gets really freed.


Thanks for your time,

Arthur C.
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