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doc: Update track_io_timing documentation to mention pg_stat_io. 

The I/O timing information collected when track_io_timing is
enabled is now documented to appear in the pg_stat_io view,
which was previously not mentioned.

This commit also enhances the description of track_io_timing
to clarify that it monitors not only block read and write
but also block extend and fsync operations. Additionally,
the description of track_wal_io_timing has been improved
to mention both WAL write and WAL fsync monitoring.

Backpatch to v16 where pg_stat_io was added.

Author: Hajime Matsunaga
Reviewed-by: Melanie Plageman, Nazir Bilal Yavuz, Fujii Masao
Discussion: https://postgr.es/m/TYWPR01MB10742EE4A6F34C33061429D38A4D52@TYWPR01MB10742.jpnprd01.prod.outlook.com
This commit is contained in:
Fujii Masao 2024-07-10 15:56:07 +09:00
parent 4ac08251eb
commit 0d483ad4cc
2 changed files with 5 additions and 3 deletions
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4
doc/src/sgml/config.sgml
View File

@ -8131,7 +8131,9 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
measure the overhead of timing on your system. measure the overhead of timing on your system.
I/O timing information is I/O timing information is
displayed in <link linkend="monitoring-pg-stat-database-view"> displayed in <link linkend="monitoring-pg-stat-database-view">
<structname>pg_stat_database</structname></link>, in the output of <structname>pg_stat_database</structname></link>,
<link linkend="monitoring-pg-stat-io-view">
<structname>pg_stat_io</structname></link>, in the output of
<xref linkend="sql-explain"/> when the <literal>BUFFERS</literal> option <xref linkend="sql-explain"/> when the <literal>BUFFERS</literal> option
is used, in the output of <xref linkend="sql-vacuum"/> when is used, in the output of <xref linkend="sql-vacuum"/> when
the <literal>VERBOSE</literal> option is used, by autovacuum the <literal>VERBOSE</literal> option is used, by autovacuum

4
doc/src/sgml/monitoring.sgml
View File

@ -180,12 +180,12 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
<para> <para>
The parameter <xref linkend="guc-track-io-timing"/> enables monitoring The parameter <xref linkend="guc-track-io-timing"/> enables monitoring
of block read and write times. of block read, write, extend, and fsync times.
</para> </para>
<para> <para>
The parameter <xref linkend="guc-track-wal-io-timing"/> enables monitoring The parameter <xref linkend="guc-track-wal-io-timing"/> enables monitoring
of WAL write times. of WAL write and fsync times.
</para> </para>
<para> <para>