Re: Rename max_parallel_degree?

Julien Rouhaud <julien.rouhaud@dalibo.com>

From: Julien Rouhaud <julien.rouhaud@dalibo.com>

To: Robert Haas <robertmhaas@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>

Cc: Josh Berkus <josh@agliodbs.com>, "David G. Johnston" <david.g.johnston@gmail.com>, Amit Kapila <amit.kapila16@gmail.com>, Peter Geoghegan <pg@heroku.com>, Noah Misch <noah@leadboat.com>, David Rowley <david.rowley@2ndquadrant.com>, Alvaro Herrera <alvherre@2ndquadrant.com>, Magnus Hagander <magnus@hagander.net>, Bruce Momjian <bruce@momjian.us>, PostgreSQL-development <pgsql-hackers@postgresql.org>

Date: 2016-06-11T21:37:46Z

Lists: pgsql-hackers

Attachments

global_max_parallel_workers.diff (text/plain) patch

On 09/06/2016 16:04, Robert Haas wrote:
> 
> OK, I pushed this after re-reviewing it and fixing a number of
> oversights.  There remains only the task of adding max_parallel_degree
> as a system-wide limit (as opposed to max_parallel_degree now
> max_parallel_workers_per_gather which is a per-Gather limit), which
> I'm going to argue should be a new open item and not necessarily one
> that I have to own myself.  I would like to take care of it, but I
> will not put it ahead of fixing actual defects and I will not promise
> to have it done in time for 9.6.
> 

PFA a patch to fix this open item.  I used the GUC name provided in the
9.6 open item page (max_parallel_workers), with a default value of 4.
Value 0 is another way to disable parallel query.

-- 
Julien Rouhaud
http://dalibo.com - http://dalibo.org