diff options
| author | Michael Paquier | 2025-02-26 00:49:59 +0000 |
|---|---|---|
| committer | Michael Paquier | 2025-02-26 00:49:59 +0000 |
| commit | 6c349d83b607cfe20a685a5f66a4fa0e24dbe458 (patch) | |
| tree | f40e52d4a8571f996976ffe0876b989921e9a998 /src/include/pgstat.h | |
| parent | a5cbdeb98af9a8d4f683fbffa69cd74be1f4a084 (diff) | |
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/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 fc651d03cf9..e64c527265b 100644 --- a/src/include/pgstat.h +++ b/src/include/pgstat.h @@ -564,7 +564,7 @@ extern bool pgstat_bktype_io_stats_valid(PgStat_BktypeIO *backend_io, BackendType bktype); extern void pgstat_count_io_op(IOObject io_object, IOContext io_context, IOOp io_op, uint32 cnt, uint64 bytes); -extern instr_time pgstat_prepare_io_time(void); +extern instr_time pgstat_prepare_io_time(bool track_io_guc); extern void pgstat_count_io_op_time(IOObject io_object, IOContext io_context, IOOp io_op, instr_time start_time, uint32 cnt, uint64 bytes); |