| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Josh berkus <josh(at)agliodbs(dot)com> |
| Cc: | Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Peter Geoghegan <pg(at)heroku(dot)com>, 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 18:29:56 |
| Message-ID: | 22406.1464719396@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Josh berkus <josh(at)agliodbs(dot)com> writes:
> One more consistency question: what's the effect of running out of
> max_parallel_workers?
ITYM max_worker_processes (ie, the cluster-wide pool size)?
> That is, say max_parallel_workers is set to 10, and 8 are already
> allocated. If I ask for max_parallel_X = 4, how many cores to I use?
One of my reasons for liking max_parallel_workers is that you can sensibly
compare it to max_worker_processes to figure out how many workers you're
likely to get. If you think in terms of "degree" it takes some additional
mental arithmetic to understand what will happen.
> Presumably the leader isn't counted towards max_parallel_workers?
Not under what I'm proposing.
regards, tom lane
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