pg.ddx.io  pgsql-hackers@postgresql.org mailing list archive  

help / color / mirror / Atom feed
From: Joshua D. Drake <jd@commandprompt.com>
To: Josh berkus <josh@agliodbs.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Noah Misch <noah@leadboat.com>
Cc: David Rowley <david.rowley@2ndquadrant.com>
Cc: Amit Kapila <amit.kapila16@gmail.com>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Magnus Hagander <magnus@hagander.net>
Cc: Bruce Momjian <bruce@momjian.us>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: Rename max_parallel_degree?
Date: Tue, 31 May 2016 10:14:17 -0700
Message-ID: <574DC669.703@commandprompt.com> (raw)
In-Reply-To: <574DC585.7010507@agliodbs.com>
References: <20160426152217.GA548975@alvherre.pgsql>
	<CA+Tgmoa7uxyQ=gCgTUpzhc5V+biZspi9Cot8v0S96LiATgnoYQ@mail.gmail.com>
	<8684.1461685466@sss.pgh.pa.us>
	<CA+TgmoYKkQigU+LeqVREnUvvd5eDx0ju8-i_QexbX_+BV0p0Fw@mail.gmail.com>
	<CA+TgmobRmK649eDYvF6dgnQJNJVJvZffDz674wD+GWqCcb=YjQ@mail.gmail.com>
	<CAA4eK1K9jEnnEs_xxR0b5MH_8RTybe22DfkufL=ksX2o-ZqCMw@mail.gmail.com>
	<CAKJS1f_kijB4EPpUrML2q=pourNnQB+WOdBuCCBSDc27BK_gvw@mail.gmail.com>
	<CA+TgmoYjMmSx93onaoOSrWcsNHmD2GOegfyrKoJs=1tbhUMHeg@mail.gmail.com>
	<20160529053300.GD496776@tornado.leadboat.com>
	<CA+TgmoYqLP6dPpcLvWU-ToJFNn4Dp3NE2qAmgXprKN3S6wTSFw@mail.gmail.com>
	<WM!782dde02eb02f131fac86b9aa0affdd2fa2450ae598af9554b103693ecd60442e44967d03f38f3b7cda9ff5b35da9166!@mailstronghold-2.zmailcloud.com>
	<574DBEA4.9000205@agliodbs.com>
	<8716.1464714201@sss.pgh.pa.us>
	<WM!fa29cdfaada6f23ea036083b3b09c992113c0dd0d39c12a9cb6f842c5da62c7ec3f6f29cf1a792b4d2a344288b7c1492!@mailstronghold-2.zmailcloud.com>
	<574DC585.7010507@agliodbs.com>
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-hackers>

On 05/31/2016 10:10 AM, Josh berkus wrote:

> Compare this:
>
> "max_parallel is the maximum number of parallel workers which will work
> on each stage of the query which is parallizable.  If you set it to 4,
> you get up to 4 workers."
>
> with this:
>
> "max_parallel_degree is the amount of parallelism in the query, with the
> understanding that the original parent process counts as 1, which means
> that if you set it to 1 you get no parallelism, and if you want 4
> parallel workers you need to set it to 5."
>
> Which one of those is going to require more explanations on -general and
> -novice?  Bets?
>
> Let's not be complicated for the sake of being complicated.
>

+1

-- 
Command Prompt, Inc.                  http://the.postgres.company/
                         +1-503-667-4564
PostgreSQL Centered full stack support, consulting and development.
Everyone appreciates your honesty, until you are honest with them.


-- 
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers



view thread (185+ messages)  latest in thread

Message-ID: <574DC669.703@commandprompt.com>
Permalink:  ../574DC669.703@commandprompt.com/
Also on:    postgresql.org/message-id/574DC669.703@commandprompt.com

 · 

reply
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: jd@commandprompt.com, josh@agliodbs.com, tgl@sss.pgh.pa.us, robertmhaas@gmail.com, noah@leadboat.com, david.rowley@2ndquadrant.com, amit.kapila16@gmail.com, alvherre@2ndquadrant.com, magnus@hagander.net, bruce@momjian.us
  Subject: Re: Rename max_parallel_degree?
  In-Reply-To: <574DC669.703@commandprompt.com>

* 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