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aio: Infrastructure for io_method=worker

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This commit contains the basic, system-wide, infrastructure for
io_method=worker. It does not yet actually execute IO, this commit just
provides the infrastructure for running IO workers, kept separate for easier
review.

The number of IO workers can be adjusted with a PGC_SIGHUP GUC. Eventually
we'd like to make the number of workers dynamically scale up/down based on the
current "IO load".

To allow the number of IO workers to be increased without a restart, we need
to reserve PGPROC entries for the workers unconditionally. This has been
judged to be worth the cost. If it turns out to be problematic, we can
introduce a PGC_POSTMASTER GUC to control the maximum number.

As io workers might be needed during shutdown, e.g. for AIO during the
shutdown checkpoint, a new PMState phase is added. IO workers are shut down
after the shutdown checkpoint has been performed and walsender/archiver have
shut down, but before the checkpointer itself shuts down. See also
87a6690cc6.

Updates PGSTAT_FILE_FORMAT_ID due to the addition of a new BackendType.

Reviewed-by: Noah Misch <noah@leadboat.com>
Co-authored-by: Thomas Munro <thomas.munro@gmail.com>
Co-authored-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/uvrtrknj4kdytuboidbhwclo4gxhswwcpgadptsjvjqcluzmah%40brqs62irg4dt
Discussion: https://postgr.es/m/20210223100344.llw5an2aklengrmn@alap3.anarazel.de
Discussion: https://postgr.es/m/stj36ea6yyhoxtqkhpieia2z4krnam7qyetc57rfezgk4zgapf@gcnactj4z56m
This commit is contained in:
Andres Freund
2025-03-18 10:52:33 -04:00
parent 549ea06e42
commit 55b454d0e1
20 changed files with 342 additions and 15 deletions
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10
src/test/regress/expected/stats.out
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@@ -51,6 +51,14 @@ client backend|relation|vacuum
client backend|temp relation|normal
client backend|wal|init
client backend|wal|normal
io worker|relation|bulkread
io worker|relation|bulkwrite
io worker|relation|init
io worker|relation|normal
io worker|relation|vacuum
io worker|temp relation|normal
io worker|wal|init
io worker|wal|normal
slotsync worker|relation|bulkread
slotsync worker|relation|bulkwrite
slotsync worker|relation|init
@@ -87,7 +95,7 @@ walsummarizer|wal|init
walsummarizer|wal|normal
walwriter|wal|init
walwriter|wal|normal
(71 rows)
(79 rows)
\a
-- ensure that both seqscan and indexscan plans are allowed
SET enable_seqscan TO on;