| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | Joe Conway <mail(at)joeconway(dot)com>, "scott(dot)marlowe" <scott(dot)marlowe(at)ihs(dot)com> |
| Cc: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, lutzeb(at)aeccom(dot)com, pgsql-performance(at)postgresql(dot)org, Neil Conway <neilc(at)samurai(dot)com> |
| Subject: | Re: Wierd context-switching issue on Xeon |
| Date: | 2004-04-19 21:55:04 |
| Message-ID: | 200404191455.04068.josh@agliodbs.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
Joe,
> I've got a quad 2.8Ghz MP Xeon (IBM x445) that I could test on. Does
> anyone have a test set that can reliably reproduce the problem?
Unfortunately we can't seem to come up with one. So far we have 2 machines
that exhibit the issue, and their databases are highly confidential (State of
WA education data).
It does seem to require a database which is in the many GB (> 10GB), and a
situation where a small subset of the data is getting hit repeatedly by
multiple processes. So you could try your own data warehouse, making sure
that you have at least 4 connections hitting one query after another.
--
-Josh Berkus
Aglio Database Solutions
San Francisco
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Tom Lane | 2004-04-19 22:55:34 | Re: Wierd context-switching issue on Xeon |
| Previous Message | Dirk Lutzebaeck | 2004-04-19 21:18:27 | Re: Wierd context-switching issue on Xeon |