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| author | Michael Paquier <michael@paquier.xyz> | 2025-02-26 09:49:59 +0900 |
|---|---|---|
| committer | Michael Paquier <michael@paquier.xyz> | 2025-02-26 09:49:59 +0900 |
| commit | 6c349d83b607cfe20a685a5f66a4fa0e24dbe458 (patch) | |
| tree | f40e52d4a8571f996976ffe0876b989921e9a998 /src/backend/utils/misc/guc_tables.c | |
| parent | a5cbdeb98af9a8d4f683fbffa69cd74be1f4a084 (diff) | |
| download | postgresql-6c349d83b607cfe20a685a5f66a4fa0e24dbe458.tar.gz postgresql-6c349d83b607cfe20a685a5f66a4fa0e24dbe458.zip | |
Re-add GUC track_wal_io_timing
This commit is a rework of 2421e9a51d20, about which Andres Freund has
raised some concerns as it is valuable to have both track_io_timing and
track_wal_io_timing in some cases, as the WAL write and fsync paths can
be a major bottleneck for some workloads. Hence, it can be relevant to
not calculate the WAL timings in environments where pg_test_timing
performs poorly while capturing some IO data under track_io_timing for
the non-WAL IO paths. The opposite can be also true: it should be
possible to disable the non-WAL timings and enable the WAL timings (the
previous GUC setups allowed this possibility).
track_wal_io_timing is added back in this commit, controlling if WAL
timings should be calculated in pg_stat_io for the read, fsync and write
paths, as done previously with pg_stat_wal. pg_stat_wal previously
tracked only the sync and write parts (now removed), read stats is new
data tracked in pg_stat_io, all three are aggregated if
track_wal_io_timing is enabled. The read part matters during recovery
or if a XLogReader is used.
Extra note: more control over if the types of timings calculated in
pg_stat_io could be done with a GUC that lists pairs of (IOObject,IOOp).
Reported-by: Andres Freund <andres@anarazel.de>
Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Co-authored-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/3opf2wh2oljco6ldyqf7ukabw3jijnnhno6fjb4mlu6civ5h24@fcwmhsgmlmzu
Diffstat (limited to 'src/backend/utils/misc/guc_tables.c')
| -rw-r--r-- | src/backend/utils/misc/guc_tables.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/backend/utils/misc/guc_tables.c b/src/backend/utils/misc/guc_tables.c index 690bf96ef03..ad25cbb39c5 100644 --- a/src/backend/utils/misc/guc_tables.c +++ b/src/backend/utils/misc/guc_tables.c @@ -1501,6 +1501,15 @@ struct config_bool ConfigureNamesBool[] = false, NULL, NULL, NULL }, + { + {"track_wal_io_timing", PGC_SUSET, STATS_CUMULATIVE, + gettext_noop("Collects timing statistics for WAL I/O activity."), + NULL + }, + &track_wal_io_timing, + false, + NULL, NULL, NULL + }, { {"update_process_title", PGC_SUSET, PROCESS_TITLE, |