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Re: Initial 9.2 pgbench write results

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Simon Riggs <simon(at)2ndquadrant(dot)com>
Cc: Greg Smith <greg(at)2ndquadrant(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Initial 9.2 pgbench write results
Date: 2012-02-27 13:08:04
Message-ID: CA+Tgmob=SmL3Np7BqHUwHrkgtk-Sj6+RHRfek7LTrVcKU0bYrw@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Mon, Feb 27, 2012 at 3:50 AM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
> That isn't the case. We have evidence that the current knobs are
> hugely ineffective in some cases.
>
> Turning the bgwriter off is hardly "adjusting a setting", its
> admitting that there is no useful setting.
>
> I've suggested changes that aren't possible by tuning the current knobs.

OK, fair point.  But I don't think any of us - Greg included - have an
enormously clear idea why turning the background writer off is
improving performance in some cases.  I think we need to understand
that better before we start changing things.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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