Re: pgbench transaction timestamps

FYI, patch applied by Tatsuo. Thanks.

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Greg Smith wrote:
> This patch changes the way pgbench outputs its latency log files so that
> every transaction gets a timestamp and notes which transaction type was
> executed. It's a one-line change that just dumps some additional
> information that was already sitting in that area of code. I also made a
> couple of documentation corrections and clarifications on some of the more
> confusing features of pgbench.
>
> It's straightforward to parse log files in this format to analyze what
> happened during the test at a higher level than was possible with the
> original format. You can find some rough sample code to convert this
> latency format into CVS files and then into graphs at
> http://www.westnet.com/~gsmith/content/postgresql/pgbench.htm which I'll
> be expanding on once I get all my little patches sent in here.
>
> If you recall the earlier version of this patch I submitted, it added a
> cleanup feature that did a vacuum and checkpoint after the test was
> finished and reported two TPS results. The idea was to quantify how much
> of a hit the eventual table maintenance required to clean up after the
> test would take. While those things do influence results and cause some
> of the run-to-run variation in TPS (checkpoints are particularly visible
> in the graphs), after further testing I concluded running a VACUUM VERBOSE
> and CHECKPOINT in a script afterwards and analyzing the results was more
> useful than integrating something into pgbench itself.
>
> --
> * Greg Smith gsmith(at)gregsmith(dot)com http://www.gregsmith.com Baltimore, MD
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