Re: Direct I/O issues

Greg Smith <gsmith@gregsmith.com> writes:
> The results I get now look fishy.

There are at least two things wrong with this program:

* It does not respect the alignment requirement for O_DIRECT buffers
  (reportedly either 512 or 4096 bytes depending on filesystem).

* It does not check for errors (if it had, you might have realized the
  other problem).

            regards, tom lane