Date: Fri, 13 Aug 2010 10:52:35 +0200 From: Roman Divacky <rdivacky@FreeBSD.org> To: Doug Barton <dougb@FreeBSD.org> Cc: delphij@FreeBSD.org, core@FreeBSD.org, Gabor Kovesdan <gabor@FreeBSD.org>, current@FreeBSD.org Subject: Re: Official request: Please make GNU grep the default Message-ID: <20100813085235.GA16268@freebsd.org> In-Reply-To: <4C6505A4.9060203@FreeBSD.org> References: <4C6505A4.9060203@FreeBSD.org>
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On Fri, Aug 13, 2010 at 01:43:16AM -0700, Doug Barton wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > Gabor, > > I hope at this point it goes without saying that I have a lot of respect > for the work you've done on BSD grep, and I've already told you that I > think you're very courageous for taking the project on. I've been > testing and evaluating it for some time now, and I think I've given it a > fair trial. You've done a fairly good job of responding to bug reports, > and I understand that the exposure BSD grep has received as the default > in HEAD has been very valuable in exposing additional areas that need > work. However, with all that in mind I am officially asking you to > please change the default in HEAD to GNU grep. (Note, I am _not_ asking > you to remove BSD grep from the tree, just to change the default.) > > 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 what about optimizing BSD grep instead?
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