| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Claudio Freire <klaussfreire(at)gmail(dot)com> |
| Cc: | Tatsuo Ishii <ishii(at)postgresql(dot)org>, KONDO Mitsumasa <kondo(dot)mitsumasa(at)lab(dot)ntt(dot)co(dot)jp>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Magnus Hagander <magnus(at)hagander(dot)net>, Josh Berkus <josh(at)agliodbs(dot)com>, Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>, "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, PostgreSQL-Dev <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Why we are going to have to go DirectIO |
| Date: | 2013-12-11 00:34:44 |
| Message-ID: | 20131211003444.GA2935@awork2.anarazel.de |
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| Lists: | pgsql-hackers |
On 2013-12-04 05:39:23 -0200, Claudio Freire wrote:
> Problem is, Postgres relies on a working kernel cache for checkpoints.
> Checkpoint logic would have to be heavily reworked to account for an
> impaired kernel cache.
I don't think checkpoints are the critical problem with that, they are
nicely in the background and we could easily add sorting.
Rather I think it would be the writeout of a dirty victim buffer when
acquiring a new buffer.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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