From: Michael Meskes <meskes@postgresql.org>
To: Boszormenyi Zoltan <zb@cybertec.at>
Cc: Noah Misch <noah@leadboat.com>
Cc: Michael Meskes <meskes@postgresql.org>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: PG Hackers <pgsql-hackers@postgresql.org>
Cc: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
Cc: Bruce Momjian <bruce@momjian.us>
Subject: Re: ECPG FETCH readahead
Date: Tue, 17 Apr 2012 06:48:19 +0200
Message-ID: <20120417044819.GA9043@feivel.credativ.lan> (raw)
In-Reply-To: <4F8CEB5A.100@cybertec.at>
References: <4F83E2B9.3030302@cybertec.at>
<20120410143722.GC6129@tornado.leadboat.com>
<20120410145501.GA11554@feivel.credativ.lan>
<4F847453.9060200@cybertec.at>
<20120416024636.GA4536@feivel.credativ.lan>
<4F8B9F19.3040403@cybertec.at>
<20120416160448.GA9968@feivel.credativ.lan>
<4F8C544F.4080708@cybertec.at>
<20120417035208.GA5465@feivel.credativ.lan>
<4F8CEB5A.100@cybertec.at>
On Tue, Apr 17, 2012 at 06:02:34AM +0200, Boszormenyi Zoltan wrote:
> I listed two scenarios.
> 1. occasional bump of the readahead window for large requests,
> for smaller requests it uses the originally set size
> 2. permanent bump of the readahead window for large requests
> (larger than previously seen), all subsequent requests use
> the new size
>
> Both can be implemented easily, which one do you prefer?
> If you always use very large requests, 1) behaves like 2)
I'd say let's go for #2. #1 is probably more efficient but not what the
programmer asked us to do. After all it's easy to increase the window size
accordingly if you want so as a programmer.
Michael
--
Michael Meskes
Michael at Fam-Meskes dot De, Michael at Meskes dot (De|Com|Net|Org)
Michael at BorussiaFan dot De, Meskes at (Debian|Postgresql) dot Org
Jabber: michael.meskes at googlemail dot com
VfL Borussia! Força Barça! Go SF 49ers! Use Debian GNU/Linux, PostgreSQL
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-hackers@postgresql.org
Cc: meskes@postgresql.org, zb@cybertec.at, noah@leadboat.com, robertmhaas@gmail.com, heikki.linnakangas@enterprisedb.com, bruce@momjian.us
Subject: Re: ECPG FETCH readahead
In-Reply-To: <20120417044819.GA9043@feivel.credativ.lan>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox