"Pierre C" <lists(at)peufeu(dot)com> writes:
> Does PG issue checkpoint writes in "sorted" order ?
No. IIRC, a patch for that was submitted, and rejected because no
significant performance improvement could be demonstrated. We don't
have enough information about the actual on-disk layout to be very
intelligent about this, so it's better to just issue the writes and
let the OS sort them.
regards, tom lane