From: Bruce Momjian <bruce@momjian.us>
To: Peter Geoghegan <pg@bowt.ie>
Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>
Cc: Justin Pryzby <pryzby@telsasoft.com>
Cc: PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Subject: Re: PG 14 release notes, first draft
Date: Thu, 20 May 2021 19:54:37 -0400
Message-ID: <20210520235437.GG8971@momjian.us> (raw)
In-Reply-To: <CAH2-Wz=M59tCVHnuGLx9-O5bNNeB4JwqtRRuH4uv7dEjZsHYyQ@mail.gmail.com>
References: <20210520195902.GE8971@momjian.us>
<20210520203507.GA21233@alvherre.pgsql>
<20210520213752.GF8971@momjian.us>
<CAH2-Wz=M59tCVHnuGLx9-O5bNNeB4JwqtRRuH4uv7dEjZsHYyQ@mail.gmail.com>
On Thu, May 20, 2021 at 04:19:50PM -0700, Peter Geoghegan wrote:
> On Thu, May 20, 2021 at 2:37 PM Bruce Momjian <bruce@momjian.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.
I think our text "This new default better reflects current hardware
capabilities." is detailed enough. People can dig into the item to see
what it does and how it adjusts costs.
--
Bruce Momjian <bruce@momjian.us> https://momjian.us
EDB https://enterprisedb.com
If only the physical world exists, free will is an illusion.
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To: pgsql-hackers@postgresql.org
Cc: bruce@momjian.us, pg@bowt.ie, alvherre@alvh.no-ip.org, pryzby@telsasoft.com
Subject: Re: PG 14 release notes, first draft
In-Reply-To: <20210520235437.GG8971@momjian.us>
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