From: Davide Libenzi <davidel@xmailserver.org>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Jim Meyering <jim@meyering.net>, Git Mailing List <git@vger.kernel.org>
Subject: Re: git-diff-tree inordinately (O(M*N)) slow on files with many changes
Date: Mon, 16 Oct 2006 09:24:58 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0610160920250.7697@alien.or.mcafeemobile.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0610160838200.3962@g5.osdl.org>
On Mon, 16 Oct 2006, Linus Torvalds wrote:
>
> Davide? I'm quoting the whole report, because I suspect you don't follow
> the git lists, and this is all original libxdiff code.
>
> Jim: the annotation failure _may_ just be due to a "valid" diff change
> (there is not always a unique correct answer for a diff, and so two
> different diff algorithms can validly give two different answers, which
> will also mean that git-annotate/blame would give different explanations).
>
> But it could certainly also be that you just broke the diffs entirely, so
> I would like to wait for Davide to comment on your diff before Junio
> should apply it.
>
> Others may be intimately familiar with the diff algorithms too, of course.
> It just scares me personally ;)
The test is fine as is. Only really bad hash collisions can show O(M*N).
Can I have the two sample files to test?
- Davide
next prev parent reply other threads:[~2006-10-16 16:25 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-16 14:12 git-diff-tree inordinately (O(M*N)) slow on files with many changes Jim Meyering
2006-10-16 15:47 ` Linus Torvalds
2006-10-16 16:12 ` Linus Torvalds
2006-10-16 16:33 ` Jim Meyering
2006-10-16 16:42 ` Davide Libenzi
2006-10-16 16:50 ` Jim Meyering
2006-10-16 16:54 ` Davide Libenzi
2006-10-16 16:57 ` Jim Meyering
2006-10-16 17:02 ` Davide Libenzi
2006-10-16 17:56 ` Linus Torvalds
2006-10-16 18:03 ` Linus Torvalds
2006-10-16 18:41 ` Davide Libenzi
2006-10-16 18:18 ` Davide Libenzi
2006-10-16 18:51 ` Linus Torvalds
2006-10-16 19:44 ` Davide Libenzi
2006-10-16 20:29 ` Jakub Narebski
2006-10-16 22:53 ` Junio C Hamano
2006-10-16 23:24 ` Linus Torvalds
2006-10-16 23:52 ` Davide Libenzi
2006-10-16 18:24 ` Jim Meyering
2006-10-16 18:30 ` Davide Libenzi
2006-10-16 18:43 ` Jim Meyering
2006-10-16 16:54 ` Linus Torvalds
2006-10-16 16:36 ` Davide Libenzi
2006-10-16 16:57 ` Linus Torvalds
2006-10-16 16:24 ` Davide Libenzi [this message]
2006-10-16 16:54 ` Jakub Narebski
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