From: "C. Scott Ananian" <cscott@cscott.net>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Alon Ziv <alonz@nolaviz.org>, git@vger.kernel.org
Subject: Re: RFC: adding xdelta compression to git
Date: Tue, 3 May 2005 11:50:59 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.61.0505031146130.32767@cag.csail.mit.edu> (raw)
In-Reply-To: <Pine.LNX.4.58.0505022131380.3594@ppc970.osdl.org>
On Mon, 2 May 2005, Linus Torvalds wrote:
>> * Changes the repository format.
>
> It wouldn't necessarily. You should be able to do this with _zero_ changes
> to existing objects what-so-ever.
Yes. The 'chunking' code I posted earlier does this, etc. It's kinda odd
computing a SHA-1 including the 'blob <size>\0' header, even when your
representation doesn't use this type exactly, but it's no big deal. I'm
still tinkering with this, btw; I can get modest improvements in 'real' disk
space used, but nothing earth-shattering (yet). I'll post the list of
things I tried and how well they worked at some point, just to save people
the effort of retrying things.
I've been working from the 'no knowledge of commit structure needed'
perspective; I think Chris Mason has been using the structure of the
commit object to guide delta-fication and showing more impressive
space savings.
--scott
HTAUTOMAT Legion of Doom payment PBPRIME insurgent shortwave AVBUSY
Nader PBCABOOSE overthrow explosion Ortega STANDEL ECJOB Sigint FBI
( http://cscott.net/ )
prev parent reply other threads:[~2005-05-03 15:45 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-03 3:57 RFC: adding xdelta compression to git Alon Ziv
2005-05-03 4:12 ` Nicolas Pitre
2005-05-03 4:52 ` Linus Torvalds
2005-05-03 5:30 ` Davide Libenzi
2005-05-03 15:52 ` C. Scott Ananian
2005-05-03 17:35 ` Linus Torvalds
2005-05-03 18:10 ` Davide Libenzi
2005-05-03 8:06 ` [PATCH] add the ability to create and retrieve delta objects Nicolas Pitre
2005-05-03 11:24 ` Chris Mason
2005-05-03 12:51 ` Nicolas Pitre
2005-05-03 15:07 ` Linus Torvalds
2005-05-03 16:09 ` Chris Mason
2005-05-03 15:57 ` C. Scott Ananian
2005-05-03 16:35 ` Chris Mason
2005-05-03 14:13 ` Chris Mason
2005-05-03 14:24 ` Nicolas Pitre
2005-05-03 14:37 ` Chris Mason
2005-05-03 15:04 ` Nicolas Pitre
2005-05-03 16:54 ` Chris Mason
2005-05-03 14:48 ` Linus Torvalds
2005-05-03 15:52 ` Nicolas Pitre
2005-05-04 15:56 ` Chris Mason
2005-05-04 16:12 ` C. Scott Ananian
2005-05-04 17:44 ` Chris Mason
2005-05-04 22:03 ` Linus Torvalds
2005-05-04 22:43 ` Chris Mason
2005-05-05 3:25 ` Nicolas Pitre
2005-05-04 21:47 ` Geert Bosch
2005-05-04 22:34 ` Chris Mason
2005-05-05 3:10 ` Nicolas Pitre
2005-05-03 12:48 ` RFC: adding xdelta compression to git Dan Holmsand
2005-05-03 15:50 ` C. Scott Ananian [this message]
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