From: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
To: Petr Jelinek <petr@2ndquadrant.com>
To: David G. Johnston <david.g.johnston@gmail.com>
Cc: Jim Nasby <Jim.Nasby@bluetreble.com>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Josh berkus <josh@agliodbs.com>
Cc: Peter Geoghegan <pg@heroku.com>
Cc: Noah Misch <noah@leadboat.com>
Cc: David Rowley <david.rowley@2ndquadrant.com>
Cc: Amit Kapila <amit.kapila16@gmail.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: Fri, 3 Jun 2016 00:33:02 -0400
Message-ID: <a2fffd92-6e59-a4eb-dd85-c5865ebca1a0@2ndquadrant.com> (raw)
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On 6/3/16 12:21 AM, Petr Jelinek wrote:
> On 01/06/16 17:55, David G. Johnston wrote:
>> On Wed, Jun 1, 2016 at 11:45 AM, Petr Jelinek <petr@2ndquadrant.com
>> <mailto:petr@2ndquadrant.com>>wrote:
>>
>> That GUC also controls worker processes that are started by
>> extensions, not just ones that parallel query starts. This is btw
>> one thing I don't like at all about how the current limits work, the
>> parallel query will fight for workers with extensions because they
>> share the same limit.
>>
>>
>> ​Given that this models reality the GUC is doing its job. Now, maybe we
>> need additional knobs to give the end-user the ability to influence how
>> those fights will turn out.
>
> Agreed, my point is that I think we do need additional knob.
We need one knob to control how many process slots to create at server
start, and then a bunch of sliders to control how to allocate those
between regular connections, superuser connections, replication,
autovacuum, parallel workers, background workers (by tag/label/group),
and so on.
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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Cc: peter.eisentraut@2ndquadrant.com, petr@2ndquadrant.com, david.g.johnston@gmail.com, Jim.Nasby@bluetreble.com, robertmhaas@gmail.com, tgl@sss.pgh.pa.us, alvherre@2ndquadrant.com, josh@agliodbs.com, pg@heroku.com, noah@leadboat.com, david.rowley@2ndquadrant.com, amit.kapila16@gmail.com, magnus@hagander.net, bruce@momjian.us
Subject: Re: Rename max_parallel_degree?
In-Reply-To: <a2fffd92-6e59-a4eb-dd85-c5865ebca1a0@2ndquadrant.com>
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