Re: High CPU Load

On 9/14/06, Jérôme BENOIS <benois(at)argia-engineering(dot)fr> wrote:
> Yes i have a lot of users ;-)

So your work_mem is probably far too high (that's what I told you in
my first message) and you probably swap when you have too many users.
Remember that work_mem can be used several times per query (and it's
especially the case when you have a lot of sorts).
When your load is high, check your swap activity and your io/wait. top
gives you these information. If you swap, lower your work_mem to 32 MB
for example then see if it's enough for your queries to run fast (you
can check if there are files created in the $PGDATA/base/<your
database oid>/pg_tmp) and if it doesn't swap. Retry with a
lower/higher value to find the one that fits best to your queries and
load.

> I agree but by moment DB Server is so slow.

Yep, that's the information that was missing :).

> what's means "HT" please ?

Hyper threading. It's usually not recommended to enable it on
PostgreSQL servers. On most servers, you can disable it directly in
the BIOS.

--
Guillaume