Re: [PATCH] backend: compare word-at-a-time in bcTruelen
От
Robert Haas
Тема
Re: [PATCH] backend: compare word-at-a-time in bcTruelen
Дата
Msg-id
603c8f070906160503n42df8bafo26317e93ee5b5751@mail.gmail.com
Ответ на
Re: [PATCH] backend: compare word-at-a-time in bcTruelen (Stephen Frost)
Список
Дерево обсуждения
char() overhead on read-only workloads not so insignifcant as the
docs claim it is... Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>
Re: char() overhead on read-only workloads not so
insignifcant as the docs claim it is... Gurjeet Singh <singh.gurjeet@gmail.com>
Re: char() overhead on read-only workloads not so
insignifcant as the docs claim it is... Alvaro Herrera <alvherre@commandprompt.com>
[PATCH] backend: compare word-at-a-time in bcTruelen Jeremy Kerr <jk@ozlabs.org>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Stephen Frost <sfrost@snowman.net>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Robert Haas <robertmhaas@gmail.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Jeremy Kerr <jk@ozlabs.org>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Robert Haas <robertmhaas@gmail.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Simon Riggs <simon@2ndQuadrant.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Tom Lane <tgl@sss.pgh.pa.us>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Simon Riggs <simon@2ndQuadrant.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Alvaro Herrera <alvherre@commandprompt.com>
Re: [PATCH] backend: compare word-at-a-time in
bcTruelen "Kevin Grittner" <Kevin.Grittner@wicourts.gov>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Tom Lane <tgl@sss.pgh.pa.us>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Simon Riggs <simon@2ndQuadrant.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Greg Stark <gsstark@mit.edu>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Tom Lane <tgl@sss.pgh.pa.us>
Re: [PATCH] backend: compare word-at-a-time in
bcTruelen "Kevin Grittner" <Kevin.Grittner@wicourts.gov>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Stephen Frost <sfrost@snowman.net>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Robert Haas <robertmhaas@gmail.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Stephen Frost <sfrost@snowman.net>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Greg Stark <gsstark@mit.edu>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Tom Lane <tgl@sss.pgh.pa.us>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Simon Riggs <simon@2ndQuadrant.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Marko Kreen <markokr@gmail.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Simon Riggs <simon@2ndQuadrant.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Simon Riggs <simon@2ndQuadrant.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Florian Weimer <fweimer@bfk.de>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Jeremy Kerr <jk@ozlabs.org>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Jeremy Kerr <jk@ozlabs.org>
[PATCH] backend: compare word-at-a-time in bcTruelen Jeremy Kerr <jk@ozlabs.org>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Robert Haas <robertmhaas@gmail.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Jeremy Kerr <jk@ozlabs.org>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Robert Haas <robertmhaas@gmail.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Stephen Frost <sfrost@snowman.net>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Jeremy Kerr <jk@ozlabs.org>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Tom Lane <tgl@sss.pgh.pa.us>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Jeremy Kerr <jk@ozlabs.org>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Dimitri Fontaine <dfontaine@hi-media.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Stephen Frost <sfrost@snowman.net>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Jeremy Kerr <jk@ozlabs.org>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Stephen Frost <sfrost@snowman.net>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Jeremy Kerr <jk@ozlabs.org>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Tom Lane <tgl@sss.pgh.pa.us>
Re: [PATCH] backend: compare word-at-a-time in
bcTruelen Bruce Momjian <bruce@momjian.us>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Robert Haas <robertmhaas@gmail.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Alvaro Herrera <alvherre@commandprompt.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Tom Lane <tgl@sss.pgh.pa.us>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Tom Lane <tgl@sss.pgh.pa.us>
Re: [PATCH] backend: compare word-at-a-time in
bcTruelen Bruce Momjian <bruce@momjian.us>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Dimitri Fontaine <dfontaine@hi-media.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen tomas@tuxteam.de
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Tom Lane <tgl@sss.pgh.pa.us>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen "Andrew Dunstan" <andrew@dunslane.net>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Stephen Frost <sfrost@snowman.net>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Gurjeet Singh <singh.gurjeet@gmail.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Greg Stark <gsstark@mit.edu>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Jeremy Kerr <jk@ozlabs.org>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Robert Haas <robertmhaas@gmail.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Andrew Dunstan <andrew@dunslane.net>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Greg Stark <gsstark@mit.edu>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Stephen Frost <sfrost@snowman.net>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Chuck McDevitt <cmcdevitt@greenplum.com>
Re: [PATCH] backend: compare word-at-a-time in bcTruelen Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
Uninstallation error <genie.japo@gmail.com>
Re: Uninstallation error Peter Eisentraut <peter_e@gmx.net>
Re: Uninstallation error Alvaro Herrera <alvherre@commandprompt.com>
Re: Uninstallation error <genie.japo@gmail.com>
Re: char() overhead on read-only workloads not so insignifcant as the docs claim it is... Jeremy Kerr <jk@ozlabs.org>
On Tue, Jun 16, 2009 at 6:30 AM, Stephen Frost wrote: > * Robert Haas (robertmhaas@gmail.com) wrote: >> As I look at this, another problem is that it seems to me that you're >> assuming that VARDATA_ANY() will return an aligned pointer, which >> isn't necessarily the case (see src/include/postgres.h). > > I believe you need to look at it more carefully. I don't think it's > making any such assumption. Specifically, it has three loops; an "until > we're aligned" loop, then a "while we're aligned", and a "when we've > done all the aligned we could do". I see that... but I don't think the test in the first loop is correct.It's based on the value of i % 4, but I'm not convinced that you know anything about the alignment at the point where i == 0. I might be all wet here, I haven't looked at this area of the code in detail. > On the flip side, I am curious as to if the arguments to a stored > procedure are always aligned or not. Never had a case to care before, > but if palloc() is always going to return an aligned chunk of memory > (per MemSetAligned in c.h) it makes me wonder. Well, if it's char(n) for n <~ 126, it's going to have a 1-byte varlena header... ...Robert
В списке pgsql-hackers по дате отправления