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pgbench: Elaborate latency reporting.

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Isolate transaction latency (elapsed time between submitting first
command and receiving response to last command) from client-side delays
pertaining to the --rate schedule.  Under --rate, report schedule lag as
defined in the documentation.  Report latency standard deviation
whenever we collect the measurements to do so.  All of these changes
affect --progress messages and the final report.

Fabien COELHO, reviewed by Pavel Stehule.
This commit is contained in:
Noah Misch
2013-10-05 17:33:38 -04:00
parent 8e00a3850d
commit 2d6c0f10ef
2 changed files with 115 additions and 18 deletions
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6
doc/src/sgml/pgbench.sgml
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@ -412,7 +412,11 @@ pgbench <optional> <replaceable>options</> </optional> <replaceable>dbname</>
<term><option>--progress=</option><replaceable>sec</></term>
<listitem>
<para>
Show progress report every <literal>sec</> seconds.
Show progress report every <literal>sec</> seconds. The report
includes the time since the beginning of the run, the tps since the
last report, and the transaction latency average and standard
deviation since the last report. Under throttling (<option>-R</>), it
also includes the average schedule lag time since the last report.
</para>
</listitem>
</varlistentry>