From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
---|---|
To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
Cc: | Tomas Vondra <tv(at)fuzzy(dot)cz>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: autovacuum stress-testing our system |
Date: | 2012-09-27 14:57:24 |
Message-ID: | 1348757745-sup-1839@alvh.no-ip.org |
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Lists: | pgsql-hackers |
Excerpts from Simon Riggs's message of jue sep 27 06:51:28 -0300 2012:
> On 26 September 2012 15:47, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> wrote:
> >
> > Really, as far as autovacuum is concerned, it would be much more useful
> > to be able to reliably detect that a table has been recently vacuumed,
> > without having to request a 10ms-recent pgstat snapshot. That would
> > greatly reduce the amount of time autovac spends on pgstat requests.
>
> VACUUMing generates a relcache invalidation. Can we arrange for those
> invalidations to be received by autovac launcher, so it gets immediate
> feedback of recent activity without polling?
Hmm, this is an interesting idea worth exploring, I think. Maybe we
should sort tables in the autovac worker to-do list by age of last
invalidation messages received, or something like that. Totally unclear
on the details, but as I said, worth exploring.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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