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Re: increased max_parallel_workers_per_gather results in fewerworkers? - Mailing list pgsql-performance

From Justin Pryzby
Subject Re: increased max_parallel_workers_per_gather results in fewerworkers?
Date
Msg-id 20200603211526.GU30144@telsasoft.com
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In response to increased max_parallel_workers_per_gather results in fewer workers?  (Philip Semanchuk <philip@americanefficient.com>)
Responses Re: increased max_parallel_workers_per_gather results in fewerworkers?  (Philip Semanchuk <philip@americanefficient.com>)
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On Wed, Jun 03, 2020 at 04:04:13PM -0400, Philip Semanchuk wrote:
> Can anyone help me understand why this happens, or where I might look for clues? 

What version postgres ?

Can you reproduce if you do:
ALTER SYSTEM SET max_parallel_workers_per_gather=0; SELECT pg_reload_conf();
.. and then within the session do: SET max_parallel_workers_per_gather=12;

I guess you should show an explain analyze, specifically "Workers
Planned/Launched", maybe by linking to explain.depesz.com

-- 
Justin

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