| From: | Robert Creager <Robert_Creager(at)StorageTek(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Robert Creager <Robert_Creager(at)StorageTek(dot)com>, pgsql-performance(at)postgresql(dot)org, Andy Hewitt III <ralph_hewitt_iii(at)StorageTek(dot)com> |
| Subject: | Re: Huge performance problem between 7.4.1 and 8.0.3 - CS issue? |
| Date: | 2005-07-19 18:09:51 |
| Message-ID: | 20050719120951.00002520@C118181.stortek.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
On Tue, 19 Jul 2005 12:54:22 -0400
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Hmm, I hadn't thought about the possible impact of multiple concurrent
> vacuums. Is the problem caused by that, or has performance already gone
> into the tank by the time the cron-driven vacuums are taking long enough
> to overlap?
Don't know just yet. When I run the vacuums manually on a healthy system on
741, they take less than 30 seconds. I've stopped the cron vacuum and canceled
all the outstanding vacuum processes, but the 803 is still struggling (1/2 hour
later).
I'll re-start the database, vacuum full analyze and restart the runs without the
cron vacuum running.
Cheers,
Rob
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Tom Lane | 2005-07-19 18:09:56 | Re: Impact of checkpoint_segments under continual load conditions |
| Previous Message | John A Meinel | 2005-07-19 17:58:20 | Re: Looking for tips |