Horton

Re: Estimating HugePages Requirements?

Nathan Bossart <bossartn@amazon.com>

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From: "Bossart, Nathan" <bossartn@amazon.com>
To: Michael Paquier <michael@paquier.xyz>
Cc: Kyotaro Horiguchi <horikyota.ntt@gmail.com>, "tgl@sss.pgh.pa.us" <tgl@sss.pgh.pa.us>, "robertmhaas@gmail.com" <robertmhaas@gmail.com>, "masao.fujii@oss.nttdata.com" <masao.fujii@oss.nttdata.com>, "pryzby@telsasoft.com" <pryzby@telsasoft.com>, "andres@anarazel.de" <andres@anarazel.de>, "magnus@hagander.net" <magnus@hagander.net>, "mark.dilger@enterprisedb.com" <mark.dilger@enterprisedb.com>, "don@seiler.us" <don@seiler.us>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2021-09-16T17:06:11Z
Lists: pgsql-hackers

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On 9/15/21, 7:42 PM, "Michael Paquier" <michael@paquier.xyz> wrote:
> Fixed that, and applied.  Could you rebase the last patch with the
> name suggested for the last GUC, including the docs?  It looks like we
> are heading for shared_memory_size_in_huge_pages.

Thanks!  And done.

For the huge pages setup documentation, I considered sending stderr to
/dev/null to eliminate the LOG from the output, but I opted against
that.  That would've looked like this:

        postgres -D $PGDATA -C shared_memory_size_in_huge_pages 2> /dev/null

Otherwise, there aren't any significant changes in this version of the
patch besides the name change.

Nathan

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.