svn commit: r187132 - head/usr.bin/make
David O'Brien
obrien at FreeBSD.org
Tue Feb 3 07:40:24 PST 2009
On Tue, Feb 03, 2009 at 07:40:10AM +0000, Poul-Henning Kamp wrote:
> In message <20090202220628.GA76833 at dragon.NUXI.org>, "David O'Brien" writes:
> I am disappointed.
> You of all people here should know better than making such a mess
> out of benchmarks.
Poul-Henning,
I fully know these results are not stringent.
Warner made a baseless 10% performance claim and used it as the
bases for a commit.
It took rounds of emails to get any detail from him, none of which
were the actual times, standard deviation, etc... The only purpose
of my measurements were to see if I could reproduce anything close
to the claimed 10%.
> Second you totally bungle your data collection, by not eliminating
> cache-effects.
I would have accepted Warner's 10% if I had gotten that just once,
regardless if it was due to cache efforts or not. It would have
backed up that, without totally cooking the runs, you could see a
10% time difference.
-- David
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