| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Stephen Frost <sfrost(at)snowman(dot)net>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Turning off HOT/Cleanup sometimes |
| Date: | 2014-01-09 21:34:55 |
| Message-ID: | 20140109213455.GD19084@awork2.anarazel.de |
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| Lists: | pgsql-hackers |
On 2014-01-09 16:27:23 -0500, Robert Haas wrote:
> People *think* they don't like that, because that's the way it works
> right now. If it worked some other way, there's a good chance people
> would be complaining about that behavior, too.
I think on of the primary reason why it's causing huge slowdowns is that
the ring buffer of scan strategies causes dirty buffer writes pretty
much immediately, when a buffer is reused.
Not that delaying the writeout would work all that effectively right
now, with the current bgwriter...
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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