Re: Time to up bgwriter_lru_maxpages?

From: Jim Nasby <Jim(dot)Nasby(at)BlueTreble(dot)com>
To: Jeff Janes <jeff(dot)janes(at)gmail(dot)com>
Cc: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Time to up bgwriter_lru_maxpages?
Date: 2017-01-31 22:07:12
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On 11/29/16 9:58 AM, Jeff Janes wrote:
> Considering a single SSD can do 70% of that limit, I would say yes.
> Next question becomes... should there even be an upper limit?
> Where the contortions needed to prevent calculation overflow become
> annoying?
> I'm not a big fan of nannyism in general, but the limits on this
> parameter seem particularly pointless. You can't write out more buffers
> than exist in the dirty state, nor more than implied
> by bgwriter_lru_multiplier. So what is really the worse that can happen
> if you make it too high?

Attached is a patch that ups the limit to INT_MAX / 2, which is the same
as shared_buffers.
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble!
855-TREBLE2 (855-873-2532)

Attachment Content-Type Size
lru_maxpages.patch text/plain 1.2 KB

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