Hi there.
I increased the wal_buffers and no change made.
I'm beggining to think that my problem is not related to "checkpoint & cia" as I said early.
I have decreased the checkpoint_timeout to 3 min and the slow down continuin' ocorring after each 5 min.
In this "slowdown" the postgres does nothing, it's simply stop doing the operations. The softwares still waiting for the response.
This is a dedicated server, the only program another postgres that runs is Slony-I
2008/10/8 Scott Marlowe
<scott.marlowe@gmail.com>On Wed, Oct 8, 2008 at 12:08 PM, Kevin Grittner
<
Kevin.Grittner@wicourts.gov> wrote:
>
> If the problem is checkpoints (which seems likely but far from a sure
> thing based on the information provided), aggressive background writer
> setting might be your best bet under 8.2.X. To solve similar problems
> we had to go to the following, although many on these lists feel that
> settings this aggressive are rarely needed, so use at your own risk.
>
> #bgwriter_delay = 200ms
> bgwriter_lru_percent = 20.0
> bgwriter_lru_maxpages = 200
> bgwriter_all_percent = 10.0
> bgwriter_all_maxpages = 600
world of difference on smoothing out performance. Note that bgwriter
tends to use cpu and memory bandwidth up, so avoid going crazy on it.
> Even better would be to go to the latest revision of the 8.3 release,
> which at this writing is
8.3.4. In that release PostgreSQL spreads
> out the work of a checkpoint to minimize this problem.
easier to adjust, and much less likely to even need adjusting in 8.3.