| From: | Peter Geoghegan <pg(at)heroku(dot)com> |
|---|---|
| To: | Josh berkus <josh(at)agliodbs(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Robert Haas <robertmhaas(at)gmail(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>, Alvaro Herrera <alvherre(at)2ndquadrant(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: | 2016-05-31 17:16:56 |
| Message-ID: | CAM3SWZR6cd4v-LMmu9hoMR0pRVH9hKPSchEyH=v6BOo7OdhY5Q@mail.gmail.com |
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On Tue, May 31, 2016 at 10:10 AM, Josh berkus <josh(at)agliodbs(dot)com> wrote:
> "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.
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).
--
Peter Geoghegan
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