diff options
| author | Andres Freund | 2025-03-18 14:52:33 +0000 |
|---|---|---|
| committer | Andres Freund | 2025-03-18 15:54:01 +0000 |
| commit | 55b454d0e14084c841a034073abbf1a0ea937a45 (patch) | |
| tree | 4bdd85a6acb02123b35bfeb1c33c1c071be30ba1 /src/include/pgstat.h | |
| 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/include/pgstat.h')
| -rw-r--r-- | src/include/pgstat.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/include/pgstat.h b/src/include/pgstat.h index b01875d5b16..5bfe19e66be 100644 --- a/src/include/pgstat.h +++ b/src/include/pgstat.h @@ -211,7 +211,7 @@ typedef struct PgStat_TableXactStatus * ------------------------------------------------------------ */ -#define PGSTAT_FILE_FORMAT_ID 0x01A5BCB6 +#define PGSTAT_FILE_FORMAT_ID 0x01A5BCB7 typedef struct PgStat_ArchiverStats { |