From: Masahiko Sawada <msawada@postgresql.org>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: Fix parallel vacuum buffer usage reporting.
Date: Wed, 01 May 2024 03:35:00 +0000
Message-ID: <E1s20kF-000tSF-11@gemulon.postgresql.org> (raw)
Fix parallel vacuum buffer usage reporting.
A parallel worker's buffer usage is accumulated to its pgBufferUsage
and then is accumulated into the leader's one at the end of the
parallel vacuum. However, since the leader process used to use
dedicated VacuumPage{Hit, Miss, Dirty} globals for the buffer usage
reporting, the worker's buffer usage was not included, leading to an
incorrect buffer usage report.
To fix the problem, this commit makes vacuum use pgBufferUsage
instruments for buffer usage reporting instead of VacuumPage{Hit,
Miss, Dirty} globals. These global variables are still used by ANALYZE
command and autoanalyze.
This also fixes the buffer usage report of vacuuming on temporary
tables, since the buffers dirtied by MarkLocalBufferDirty() were not
tracked by the VacuumPageDirty variable.
Parallel vacuum was introduced in 13, but the buffer usage reporting
for VACUUM command with the VERBOSE option was implemented in
15. So backpatch to 15.
Reported-by: Anthonin Bonnefoy
Author: Anthonin Bonnefoy
Reviewed-by: Alena Rybakina, Masahiko Sawada
Discussion: https://postgr.es/m/CAO6_XqrQk+QZQcYs_C6nk0cMfHuUWk85vT9CrcA1NffFbAVE2A@mail.gmail.com
Backpatch-through: 15
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/5cd72cc0c5017a9d4de8b5d465a75946da5abd1d
Modified Files
--------------
src/backend/access/heap/vacuumlazy.c | 24 +++++++++++-------------
1 file changed, 11 insertions(+), 13 deletions(-)
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-committers@postgresql.org
Cc: msawada@postgresql.org, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: Fix parallel vacuum buffer usage reporting.
In-Reply-To: <E1s20kF-000tSF-11@gemulon.postgresql.org>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox