| From: | Peter Geoghegan <pg(at)bowt(dot)ie> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: PG 14 release notes, first draft |
| Date: | 2021-05-20 23:19:50 |
| Message-ID: | CAH2-Wz=M59tCVHnuGLx9-O5bNNeB4JwqtRRuH4uv7dEjZsHYyQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, May 20, 2021 at 2:37 PM Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> I went with this text:
>
> Reduce the default value of <varname><xref
> linkend="guc-vacuum-cost-page-miss"></varname> from 10 milliseconds to 2
> (Peter Geoghegan)
>
> I think with numbers, and the fact we are saying "decrease" havint them
> in the from/to order is best. If this was non-numeric, like to scram
> from md5, it would make more sense to use to/from.
The point of this change was to make the cost of dirtying pages much
higher than everything else, since writes are in effect much more
expensive on modern hardware. Don't know if you need to say that.
--
Peter Geoghegan
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