Re: Rename max_parallel_degree?

From: Petr Jelinek <petr(at)2ndquadrant(dot)com>
To: "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>
Cc: Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Josh berkus <josh(at)agliodbs(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Peter Geoghegan <pg(at)heroku(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, Bruce Momjian <bruce(at)momjian(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Rename max_parallel_degree?
Date: 2016-06-03 04:21:08
Message-ID: 575105B4.60506@2ndquadrant.com
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On 01/06/16 17:55, David G. Johnston wrote:
> On Wed, Jun 1, 2016 at 11:45 AM, Petr Jelinek <petr(at)2ndquadrant(dot)com
> <mailto:petr(at)2ndquadrant(dot)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.

--
Petr Jelinek http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services

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