> Consider either a box with many different postgresql instances, or one
> that run both postgresql and other software. Issuing sync() in that
> sitaution will cause sync of a lot of data that probably doesn't need
> syncing.
> But it'd probably be a very good thing on a dedicated server, giving the
> kernel the chance to optimise.
It is not like the sync is done every few seconds ! It is currently done
every 5 minutes (I actually think this is too frequent now that we have
bgwriter, 10 - 20 min would be sufficient). So imho even on a heavily
otherwise used system the sync will be better.
Andreas