On 11 Mar '08, at 10:18 AM, Jean-Daniel Dupas wrote:
The first advice I can give you is "do not load the whole file into memory".
Absolutely.
Use read stream to read chunk of data and process them. (see NSInputStream or NSFileHandle).
Or if the file is simple ascii text with newlines, you can use basic C stdio calls (fopen, fgets, fclose) to read a line at a time. You can either convert the line into an NSString, or just use something like sscanf to parse it.
In rare situations where you absolutely do have to load a huge file into memory, i.e. for an algorithm that requires random access, your best bet is to memory-map it. -[NSData dataWithContentsOfFile:options:] has an option flag to map the file. This will avoid a lot of copying, but it's still subject to the same address-space limit if your process is 32-bit, so don't expect to be able to load anything much over a gigabyte.
—Jens
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