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New GUC, track_iotiming, to track I/O timings.

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Currently, the only way to see the numbers this gathers is via
EXPLAIN (ANALYZE, BUFFERS), but the plan is to add visibility through
the stats collector and pg_stat_statements in subsequent patches.

Ants Aasma, reviewed by Greg Smith, with some further changes by me.
This commit is contained in:
Robert Haas
2012-03-27 14:52:37 -04:00
parent 98316e211b
commit 40b9b95769
8 changed files with 72 additions and 0 deletions
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15
doc/src/sgml/config.sgml
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@ -4284,6 +4284,21 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
</listitem>
</varlistentry>
<varlistentry id="guc-track-iotiming" xreflabel="track_iotiming">
<term><varname>track_iotiming</varname> (<type>boolean</type>)</term>
<indexterm>
<primary><varname>track_iotiming</> configuration parameter</primary>
</indexterm>
<listitem>
<para>
Enables timing of database I/O calls. This parameter is off by
default, because it will repeatedly query the operating system for
the current time, which may cause significant overhead on some
platforms. Only superusers can change this setting.
</para>
</listitem>
</varlistentry>
<varlistentry id="guc-track-functions" xreflabel="track_functions">
<term><varname>track_functions</varname> (<type>enum</type>)</term>
<indexterm>