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From: Nguyen Thai Ngoc Duy <pclouds@gmail.com>
To: Bo Chen <chen@chenirvine.org>
Cc: Neal Kreitzinger <nkreitzinger@gmail.com>,
	Jeff King <peff@peff.net>, Sergio <sergio.callegari@gmail.com>,
	git@vger.kernel.org
Subject: Re: GSoC - Some questions on the idea of
Date: Mon, 2 Apr 2012 08:00:22 +0700	[thread overview]
Message-ID: <CACsJy8CJK4gZwnrqkhq2DUqErS94X=99kvB9z=x9TefG=MrE4A@mail.gmail.com> (raw)
In-Reply-To: <CA+M5ThTnd+TST6WsAn-Jd=Gb=1EWaJ+QbLMxXgtAVFNVqnRcMw@mail.gmail.com>

On Mon, Apr 2, 2012 at 6:30 AM, Bo Chen <chen@chenirvine.org> wrote:
> One question,  can anyone help me clear?
>
> My .git/objects has 3 blobs, a, b, and c. a is a unique file, b and c
> two sequential versions of the same file. When I run "git gc", what
> exactly happens here, e.g., how exactly git (in the latest version)
> delta compresses-the blobs here?

See Documentation/technical/pack-heuristics.txt for how pack-objects
(called by"git gc") decides to delta either b or c based on the other
one. Once it chooses, say, b to be delta against c, it generates delta
using diff-delta.c, then store the delta in either ref-delta or
ofs-delta format. The former stores sha-1 of c, the latter the offset
of c in the pack.
-- 
Duy

  reply	other threads:[~2012-04-02  1:01 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-03-28  4:38 GSoC - Some questions on the idea of "Better big-file support" Bo Chen
2012-03-28  6:19 ` Nguyen Thai Ngoc Duy
2012-03-28 11:33   ` GSoC - Some questions on the idea of Sergio
2012-03-30 19:44     ` Bo Chen
2012-03-30 19:51     ` Bo Chen
2012-03-30 20:34       ` Jeff King
2012-03-30 23:08         ` Bo Chen
2012-03-31 11:02           ` Sergio Callegari
2012-03-31 16:18             ` Neal Kreitzinger
2012-04-02 21:07               ` Jeff King
2012-04-03  9:58                 ` Sergio Callegari
2012-04-11  1:24                 ` Neal Kreitzinger
2012-04-11  6:04                   ` Jonathan Nieder
2012-04-11 16:29                     ` Neal Kreitzinger
2012-04-11 22:09                       ` Jeff King
2012-04-11 16:35                     ` Neal Kreitzinger
2012-04-11 16:44                     ` Neal Kreitzinger
2012-04-11 17:20                       ` Jonathan Nieder
2012-04-11 18:51                         ` Junio C Hamano
2012-04-11 19:03                           ` Jonathan Nieder
2012-04-11 18:23                     ` Neal Kreitzinger
2012-04-11 21:35                   ` Jeff King
2012-04-12 19:29                     ` Neal Kreitzinger
2012-04-12 21:03                       ` Jeff King
     [not found]                         ` <4F8A2EBD.1070407@gmail.com>
2012-04-15  2:15                           ` Jeff King
2012-04-15  2:33                             ` Neal Kreitzinger
2012-04-16 14:54                               ` Jeff King
2012-05-10 21:43                             ` Neal Kreitzinger
2012-05-10 22:39                               ` Jeff King
2012-04-12 21:08                       ` Neal Kreitzinger
2012-04-13 21:36                       ` Bo Chen
2012-03-31 15:19         ` Neal Kreitzinger
2012-04-02 21:40           ` Jeff King
2012-04-02 22:19             ` Junio C Hamano
2012-04-03 10:07               ` Jeff King
2012-03-31 16:49         ` Neal Kreitzinger
2012-03-31 20:28         ` Neal Kreitzinger
2012-03-31 21:27           ` Bo Chen
2012-04-01  4:22             ` Nguyen Thai Ngoc Duy
2012-04-01 23:30               ` Bo Chen
2012-04-02  1:00                 ` Nguyen Thai Ngoc Duy [this message]
2012-03-30 19:11   ` GSoC - Some questions on the idea of "Better big-file support" Bo Chen
2012-03-30 19:54     ` Jeff King

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