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Commitb27f863

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docs: Reframe track_io_timing related docs as wait time
With AIO it does not make sense anymore to track the time for each individualIO, as multiple IOs can be in-flight at the same time. Instead we now trackthe time spent *waiting* for IOs.This should be reflected in the docs. While, so far, we only do a subset ofreads, and no other operations, via AIO, describing the GUC and view columnsas measuring IO waits is accurate for synchronous and asynchronous IO.Reviewed-by: Noah Misch <noah@leadboat.com>Discussion:https://postgr.es/m/5dzyoduxlvfg55oqtjyjehez5uoq6hnwgzor4kkybkfdgkj7ag@rbi4gsmzaczk
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‎doc/src/sgml/config.sgml

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@@ -8568,7 +8568,7 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
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</term>
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<listitem>
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<para>
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Enables timing of database I/Ocalls. This parameter is off by
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Enables timing of database I/Owaits. This parameter is off by
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default, as it will repeatedly query the operating system for
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the current time, which may cause significant overhead on some
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platforms. You can use the <xref linkend="pgtesttiming"/> tool to
@@ -8602,7 +8602,7 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
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</term>
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<listitem>
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<para>
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Enables timing of WAL I/Ocalls. This parameter is off by default,
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Enables timing of WAL I/Owaits. This parameter is off by default,
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as it will repeatedly query the operating system for the current time,
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which may cause significant overhead on some platforms.
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You can use the <application>pg_test_timing</application> tool to

‎doc/src/sgml/monitoring.sgml

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@@ -2747,7 +2747,7 @@ description | Waiting for a newly initialized WAL file to reach durable storage
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<structfield>read_time</structfield> <type>double precision</type>
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</para>
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<para>
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Time spentin read operations in milliseconds (if
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Time spentwaiting for read operations in milliseconds (if
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<xref linkend="guc-track-io-timing"/> is enabled and
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<varname>object</varname> is not <literal>wal</literal>,
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or if <xref linkend="guc-track-wal-io-timing"/> is enabled
@@ -2785,7 +2785,7 @@ description | Waiting for a newly initialized WAL file to reach durable storage
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<structfield>write_time</structfield> <type>double precision</type>
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</para>
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<para>
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Time spentin write operations in milliseconds (if
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Time spentwaiting for write operations in milliseconds (if
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<xref linkend="guc-track-io-timing"/> is enabled and
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<varname>object</varname> is not <literal>wal</literal>,
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or if <xref linkend="guc-track-wal-io-timing"/> is enabled
@@ -2813,7 +2813,7 @@ description | Waiting for a newly initialized WAL file to reach durable storage
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<structfield>writeback_time</structfield> <type>double precision</type>
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</para>
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<para>
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Time spentin writeback operations in milliseconds (if
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Time spentwaiting for writeback operations in milliseconds (if
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<xref linkend="guc-track-io-timing"/> is enabled, otherwise zero). This
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includes the time spent queueing write-out requests and, potentially,
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the time spent to write out the dirty data.
@@ -2849,7 +2849,7 @@ description | Waiting for a newly initialized WAL file to reach durable storage
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<structfield>extend_time</structfield> <type>double precision</type>
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</para>
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<para>
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Time spentin extend operations in milliseconds. (if
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Time spentwaiting for extend operations in milliseconds. (if
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<xref linkend="guc-track-io-timing"/> is enabled and
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<varname>object</varname> is not <literal>wal</literal>,
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or if <xref linkend="guc-track-wal-io-timing"/> is enabled
@@ -2923,7 +2923,7 @@ description | Waiting for a newly initialized WAL file to reach durable storage
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<structfield>fsync_time</structfield> <type>double precision</type>
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</para>
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<para>
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Time spentin fsync operations in milliseconds (if
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Time spentwaiting for fsync operations in milliseconds (if
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<xref linkend="guc-track-io-timing"/> is enabled and
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<varname>object</varname> is not <literal>wal</literal>,
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or if <xref linkend="guc-track-wal-io-timing"/> is enabled
@@ -3010,7 +3010,7 @@ description | Waiting for a newly initialized WAL file to reach durable storage
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<note>
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<para>
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Columns tracking I/O time will only be non-zero when
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Columns tracking I/Owaittime will only be non-zero when
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<xref linkend="guc-track-io-timing"/> is enabled. The user should be
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careful when referencing these columns in combination with their
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corresponding I/O operations in case <varname>track_io_timing</varname>

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