| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | testperf-general(at)pgfoundry(dot)org |
| Cc: | Mark Wong <markw(at)osdl(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 17:58:47 |
| Message-ID: | 200501070958.47834.josh@agliodbs.com |
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| Lists: | pgsql-hackers pgsql-www |
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.
--
Josh Berkus
Aglio Database Solutions
San Francisco
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