Re: pgbench transaction timestamps

> Tatsuo, would you please comment on this patch too?

No problem. I will come up with a comment by the end of this week.
--
Tatsuo Ishii
SRA OSS, Inc. Japan

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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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> Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
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