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From: Joshua D. Drake <jd@commandprompt.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
To: Josh berkus <josh@agliodbs.com>
Cc: Peter Geoghegan <pg@heroku.com>
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 10:41:08 -0700
Message-ID: <574DCCB4.8060907@commandprompt.com> (raw)
In-Reply-To: <9816.1464715836@sss.pgh.pa.us>
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On 05/31/2016 10:30 AM, Tom Lane wrote:
> Josh berkus <josh@agliodbs.com> writes:
>> On 05/31/2016 10:16 AM, Peter Geoghegan wrote:
>>> But the distinction between parallel workers and backends that can
>>> participate in parallel query does need to be user-visible. Worker
>>> processes are a commodity (i.e. the user must consider
>>> max_worker_processes).
>
>> It's still WAY simpler to understand "max_parallel is the number of
>> parallel workers I requested".
>
>> Any system where you set it to 2 and get only 1 worker on an idle system
>> is going to cause endless queries on the mailing lists.
>
> I really think that a GUC named "max_parallel_workers", which in fact
> limits the number of workers and not something else, is the way to go.
>

I agree with Tom here. If we are being pedantic for the sake of being 
pedantic we are just causing frustration. The term max_parallel_workers 
is simple, easy to understand and accurate enough.

Sincerely,

JD


-- 
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