| From: | Mark Wong <markw(at)osdl(dot)org> |
|---|---|
| To: | Josh Berkus <josh(at)agliodbs(dot)com> |
| Cc: | testperf-general(at)pgfoundry(dot)org, "Matthew T(dot) O'Connor" <matthew(at)zeut(dot)net>, tgl(at)sss(dot)pgh(dot)pa(dot)us, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [Testperf-general] pg_autovacuum w/ dbt2 |
| Date: | 2005-01-07 18:01:18 |
| Message-ID: | 20050107100118.A16495@osdl.org |
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| Lists: | pgsql-hackers pgsql-www |
On Fri, Jan 07, 2005 at 09:58:47AM -0800, Josh Berkus wrote:
> Mark,
>
> > No manual vacuum commands before. The decline in performance has been
> > pretty consistent in all my previous tests and people have told me on
> > many occasions that the decline in performance was probably because I
> > was never using vacuum...
>
> Hmmm ... what autovacuum params are you using? From the look of the graphs,
> VACUUM is running every 6 minutes or so, and having a huge impact on
> performance when it does run. Give me a bit of time to crunch the database
> log, and we'll see which table vacuums were taking the most time.
>
> Can you re-run this test with a fairly generous vacuum_delay setting? Given
> that the performance drops seem to correspond to wait times, I think this
> could mean a big difference.
>
All default parameters. Matthew also recommended using the
vacuum_delay setting so I was about to try that.
Mark
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