Re: Counting Elements figured out.

[Robert A Duff <bobduff@shell01.TheWorld.com>]

gisle@apal.ii.uib.no (Gisle Sælensminde) writes:

> The mmap call will allocate in blocks, but it will always allocate at least
> as much as you ask for, so it's no problem to map 100 bytes with mmap.
> It is more likely that the OP did not set the mapped pages to be readable or
> writable, or that the file was actually shorter than the number of bytes 
> asked for. This (and more) will cause mmap to return "successfully", but 
> the process will fail when the memory is accesed. It's far fewer things 
> that can go wrong with malloc. In fact malloc may also have this 
> blockwise allocation property on many systems.

If you don't want to bother with files at all, which is likely,
you can mmap /dev/zero.

- Bob