Horton

Re: Estimating HugePages Requirements?

Nathan Bossart <nathandbossart@gmail.com>

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From: Nathan Bossart <nathandbossart@gmail.com>
To: Magnus Hagander <magnus@hagander.net>
Cc: Michael Paquier <michael@paquier.xyz>, "Bossart, Nathan" <bossartn@amazon.com>, Fujii Masao <masao.fujii@oss.nttdata.com>, Justin Pryzby <pryzby@telsasoft.com>, Andres Freund <andres@anarazel.de>, Mark Dilger <mark.dilger@enterprisedb.com>, Don Seiler <don@seiler.us>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2022-03-28T17:35:03Z
Lists: pgsql-hackers

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On Thu, Mar 24, 2022 at 01:31:08PM -0700, Nathan Bossart wrote:
> A couple of other options to consider:
> 
> 1) Always set log_min_messages to WARNING/ERROR/FATAL for 'postgres -C'.
> We might need some special logic for handling the case where the user is
> inspecting the log_min_messages parameter.  With this approach, you'd
> probably never get extra output unless something was wrong (e.g., database
> already running when inspecting a runtime-computed GUC).  Also, this would
> silence any extra output that you might see today with non-runtime-computed
> GUCs.
> 
> 2) Add some way to skip just the shutdown message (e.g., a variable set
> when output_config_variable is true).  With this approach, you wouldn't get
> extra output by default, but you still might if log_min_messages is set to
> something like DEBUG3.  This wouldn't impact any extra output that you see
> today with non-runtime-computed GUCs.

I've attached a first attempt at option 1.

-- 
Nathan Bossart
Amazon Web Services: https://aws.amazon.com

Commits

  1. Silence extra logging when using "postgres -C" on runtime-computed GUCs

  2. doc: Improve postgres command for shared_memory_size_in_huge_pages

  3. Introduce GUC shared_memory_size_in_huge_pages

  4. Support "postgres -C" with runtime-computed GUCs

  5. Make shared_memory_size a preset option

  6. Introduce GUC shared_memory_size

  7. Move the shared memory size calculation to its own function

  8. Add new GUC, max_worker_processes, limiting number of bgworkers.