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Date: Fri, 13 Aug 2010 11:08:05 +0200
From: Gabor Kovesdan <gabor@FreeBSD.org>
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To: Doug Barton <dougb@FreeBSD.org>
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Cc: core@FreeBSD.org, delphij@FreeBSD.org, current@FreeBSD.org
Subject: Re: Official request: Please make GNU grep the default
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Em 2010.08.13. 10:43, Doug Barton escreveu:
> My reason is simple, performance. While doing some portmaster work
> recently I was regression testing some changes I made to the --index*
> options and noticed that things were dramatically slower than the last
> time I tested those features. Thinking that I had made a programming
> mistake I dug into my code, and while the regexps that I was using could
> be tuned for slightly better performance the problem was not in my code.
> I then installed textproc/gnugrep to compare, and the differences were
> very dramatic using a highly pessimized test case (finding a match on
> the last line of INDEX). The script I used to test is at
> http://people.freebsd.org/~dougb/grep-time-trial.sh.txt and a typical
> result was:
>
> GNU grep
> Elapsed time: 2 seconds
>
> BSD grep
> Elapsed time: 47 seconds
>    
Ok, I'll take care of this soon, and make GNU grep default, again with a 
knob to build BSD grep. I agree with you that we cannot allow such a big 
performance drawback but I my measures only showed significant 
differences for very big searches and I didn't imagine that it could add 
up to such a big diference. I'm sorry for the bad decision I took making 
it default.

Gabor