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| author | Andres Freund <andres@anarazel.de> | 2025-03-18 10:52:33 -0400 |
|---|---|---|
| committer | Andres Freund <andres@anarazel.de> | 2025-03-18 11:54:01 -0400 |
| commit | 55b454d0e14084c841a034073abbf1a0ea937a45 (patch) | |
| tree | 4bdd85a6acb02123b35bfeb1c33c1c071be30ba1 /src/backend/utils/init/miscinit.c | |
| parent | 549ea06e4217aca10d3a73dc09cf5018c51bc23a (diff) | |
aio: Infrastructure for io_method=worker
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
87a6690cc69.
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
Diffstat (limited to 'src/backend/utils/init/miscinit.c')
| -rw-r--r-- | src/backend/utils/init/miscinit.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/backend/utils/init/miscinit.c b/src/backend/utils/init/miscinit.c index dc3521457c7..43b4dbccc3d 100644 --- a/src/backend/utils/init/miscinit.c +++ b/src/backend/utils/init/miscinit.c @@ -293,6 +293,9 @@ GetBackendTypeDesc(BackendType backendType) case B_CHECKPOINTER: backendDesc = gettext_noop("checkpointer"); break; + case B_IO_WORKER: + backendDesc = gettext_noop("io worker"); + break; case B_LOGGER: backendDesc = gettext_noop("logger"); break; |