diff options
| author | Andres Freund | 2023-02-09 04:53:42 +0000 |
|---|---|---|
| committer | Andres Freund | 2023-02-09 04:53:42 +0000 |
| commit | 28e626bde00efe8051fbd677227c97b1aa3c6a1a (patch) | |
| tree | 4f54973fcd7b65d71d5003f2385aafbda771c27b /src/tools | |
| parent | 49c2c5fcb1e1e4311f08687f78dd9121330ae637 (diff) | |
pgstat: Infrastructure for more detailed IO statistics
This commit adds the infrastructure for more detailed IO statistics. The calls
to actually count IOs, a system view to access the new statistics,
documentation and tests will be added in subsequent commits, to make review
easier.
While we already had some IO statistics, e.g. in pg_stat_bgwriter and
pg_stat_database, they did not provide sufficient detail to understand what
the main sources of IO are, or whether configuration changes could avoid
IO. E.g., pg_stat_bgwriter.buffers_backend does contain the number of buffers
written out by a backend, but as that includes extending relations (always
done by backends) and writes triggered by the use of buffer access strategies,
it cannot easily be used to tune background writer or checkpointer. Similarly,
pg_stat_database.blks_read cannot easily be used to tune shared_buffers /
compute a cache hit ratio, as the use of buffer access strategies will often
prevent a large fraction of the read blocks to end up in shared_buffers.
The new IO statistics count IO operations (evict, extend, fsync, read, reuse,
and write), and are aggregated for each combination of backend type (backend,
autovacuum worker, bgwriter, etc), target object of the IO (relations, temp
relations) and context of the IO (normal, vacuum, bulkread, bulkwrite).
What is tracked in this series of patches, is sufficient to perform the
aforementioned analyses. Further details, e.g. tracking the number of buffer
hits, would make that even easier, but was left out for now, to keep the scope
of the already large patchset manageable.
Bumps PGSTAT_FILE_FORMAT_ID.
Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Reviewed-by: Justin Pryzby <pryzby@telsasoft.com>
Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Discussion: https://postgr.es/m/20200124195226.lth52iydq2n2uilq@alap3.anarazel.de
Diffstat (limited to 'src/tools')
| -rw-r--r-- | src/tools/pgindent/typedefs.list | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list index d3224dfc36..36d1dc0117 100644 --- a/src/tools/pgindent/typedefs.list +++ b/src/tools/pgindent/typedefs.list @@ -1108,7 +1108,10 @@ ID INFIX INT128 INTERFACE_INFO +IOContext IOFuncSelector +IOObject +IOOp IPCompareMethod ITEM IV @@ -2017,6 +2020,7 @@ PgStatShared_Common PgStatShared_Database PgStatShared_Function PgStatShared_HashEntry +PgStatShared_IO PgStatShared_Relation PgStatShared_ReplSlot PgStatShared_SLRU @@ -2026,6 +2030,7 @@ PgStat_ArchiverStats PgStat_BackendFunctionEntry PgStat_BackendSubEntry PgStat_BgWriterStats +PgStat_BktypeIO PgStat_CheckpointerStats PgStat_Counter PgStat_EntryRef @@ -2034,6 +2039,7 @@ PgStat_FetchConsistency PgStat_FunctionCallUsage PgStat_FunctionCounts PgStat_HashKey +PgStat_IO PgStat_Kind PgStat_KindInfo PgStat_LocalState |