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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/misc/guc_tables.c | |
| parent | 549ea06e4217aca10d3a73dc09cf5018c51bc23a (diff) | |
| download | postgresql-55b454d0e14084c841a034073abbf1a0ea937a45.tar.gz postgresql-55b454d0e14084c841a034073abbf1a0ea937a45.zip | |
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/misc/guc_tables.c')
| -rw-r--r-- | src/backend/utils/misc/guc_tables.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/backend/utils/misc/guc_tables.c b/src/backend/utils/misc/guc_tables.c index 4984d12606c..c89316ce294 100644 --- a/src/backend/utils/misc/guc_tables.c +++ b/src/backend/utils/misc/guc_tables.c @@ -75,6 +75,7 @@ #include "storage/aio.h" #include "storage/bufmgr.h" #include "storage/bufpage.h" +#include "storage/io_worker.h" #include "storage/large_object.h" #include "storage/pg_shmem.h" #include "storage/predicate.h" @@ -3268,6 +3269,18 @@ struct config_int ConfigureNamesInt[] = }, { + {"io_workers", + PGC_SIGHUP, + RESOURCES_IO, + gettext_noop("Number of IO worker processes, for io_method=worker."), + NULL, + }, + &io_workers, + 3, 1, MAX_IO_WORKERS, + NULL, NULL, NULL + }, + + { {"backend_flush_after", PGC_USERSET, RESOURCES_IO, gettext_noop("Number of pages after which previously performed writes are flushed to disk."), gettext_noop("0 disables forced writeback."), |