On 2011-04-11 22:39, James Cloos wrote:
"GA" == Glyn Astill<glynast...@yahoo.co.uk> writes:
GA> I was hoping someone had seen this sort of behaviour before,
GA> and could offer some sort of explanation or advice.
Jesper's reply is probably most on point as to the reason.
I know that recent Opterons use some of their cache to better manage
cache-coherency. I presum recent Xeons do so, too, but perhaps yours
are not recent enough for that?
Better cache-coherence also benefits, but it does nothing to
the fact that remote DRAM fetches is way more expensive
than local ones. (Hard numbers to get excact nowadays).
--
Jesper
--
Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance
