From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Jan Wieck <JanWieck(at)Yahoo(dot)com>, PostgreSQL Development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: usleep feature for pgbench |
Date: | 2007-07-05 21:49:39 |
Message-ID: | 20070705214939.GE21455@alvh.no-ip.org |
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Lists: | pgsql-hackers |
Tom Lane wrote:
> Jan Wieck <JanWieck(at)Yahoo(dot)com> writes:
> > I think I've coded it in a way that if one doesn't use the \usleep
> > command at all, it will never even call gettimeofday() and use a NULL
> > timeout in select() as it used to.
>
> Did you check that the observed performance for non-usleep-using scripts
> didn't change? If this extra overhead causes a reduction in reported
> TPS rates it would make it hard to compare older and newer tests.
I keep wondering, why is that important? If you want to compare results
of different PG versions, surely you can run the tests with the newest
version of pgbench?
--
Alvaro Herrera http://www.flickr.com/photos/alvherre/
"Those who use electric razors are infidels destined to burn in hell while
we drink from rivers of beer, download free vids and mingle with naked
well shaved babes." (http://slashdot.org/comments.pl?sid=44793&cid=4647152)
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