| 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 |
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| 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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