Why doesn't Python's mmap work with large files?

Question

[Edit: This problem applies only to 32-bit systems. If your computer, your OS and your python implementation are 64-bit, then mmap-ing huge files works reliably and

Answer 1

You're setting the length parameter to zero, which means map in the entire file. On a 32 bit build, this won't be possible if the file length is more than 2GB (possibly 4GB).