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From: "Martin Langhoff" <martin.langhoff@gmail.com>
To: "Jon Smirl" <jonsmirl@gmail.com>
Cc: "Julian Phillips" <julian@quantumfyre.co.uk>,
	"Andreas Ericsson" <ae@op5.se>, "Theodore Tso" <tytso@mit.edu>,
	"Junio C Hamano" <gitster@pobox.com>,
	"Git Mailing List" <git@vger.kernel.org>
Subject: Re: Git's database structure
Date: Fri, 7 Sep 2007 12:33:57 +1200	[thread overview]
Message-ID: <46a038f90709061733s3b8f15b7se3e4002c1f69a04d@mail.gmail.com> (raw)
In-Reply-To: <9e4733910709050912i57ed7137o6abb02ee741d394b@mail.gmail.com>

On 9/6/07, Jon Smirl <jonsmirl@gmail.com> wrote:
> Use blame for an example. Blame has to crawl every commit to see if it

Sure. Build a quick dedicated index for that and measure

 - cost (size and commit/fetch costs)
 - benefit
 - frequency of usage

git is a special-purpouse DB that does great for certain access
patterns. Have a look at monotone for a design that looks a lot like
git but is backed by a general purpouse DB and does equally poorly for
all access patterns ;-)

> It keeps doing this until it figures out the last
> author for every line in the file. Worse case blame has to crawl every
> commit in the data store.

Yep. Can we get a minimal-cost index with just enough hints that can
speed up blame, and perhaps git log with/very/deep/path? Probably!

That's worth pursuing sure.


martin

  parent reply	other threads:[~2007-09-07  0:34 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-09-04 15:23 Git's database structure Jon Smirl
2007-09-04 15:55 ` Andreas Ericsson
2007-09-04 16:07   ` Mike Hommey
2007-09-04 16:10     ` Andreas Ericsson
2007-09-04 16:19   ` Jon Smirl
2007-09-04 16:29     ` Andreas Ericsson
2007-09-04 17:09     ` Jeff King
2007-09-04 20:17     ` David Tweed
2007-09-04 17:21   ` Junio C Hamano
2007-09-04 16:28 ` Jon Smirl
2007-09-04 16:31   ` Andreas Ericsson
2007-09-04 16:47     ` Jon Smirl
2007-09-04 16:51       ` Andreas Ericsson
2007-09-04 17:25   ` Junio C Hamano
2007-09-04 17:44     ` Jon Smirl
2007-09-04 18:04       ` Mike Hommey
2007-09-04 19:44         ` Reece Dunn
2007-09-04 18:06       ` Junio C Hamano
2007-09-04 21:25       ` Theodore Tso
2007-09-04 21:54         ` Jon Smirl
2007-09-05  7:18           ` Andreas Ericsson
2007-09-05 13:41             ` Jon Smirl
2007-09-05 14:51               ` Andreas Ericsson
2007-09-05 15:37                 ` Jon Smirl
2007-09-05 15:54                   ` Julian Phillips
2007-09-05 16:12                     ` Jon Smirl
2007-09-05 17:31                       ` Julian Phillips
2007-09-06  1:27                         ` Kyle Moffett
2007-09-05 17:39                       ` Mike Hommey
2007-09-06  8:49                       ` Andreas Ericsson
2007-09-06  9:09                         ` Junio C Hamano
2007-09-06 11:03                           ` Wincent Colaiuta
2007-09-06 12:56                       ` Johannes Schindelin
2007-09-06 18:14                         ` Steven Grimm
2007-09-07  0:33                       ` Martin Langhoff [this message]
2007-09-05 19:52               ` Andy Parkins
2007-09-04 17:19 ` Julian Phillips
2007-09-04 17:30   ` Jon Smirl
2007-09-04 18:51     ` Andreas Ericsson

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