From: A Large Angry SCM <gitzilla@gmail.com>
To: Jon Smirl <jonsmirl@gmail.com>
Cc: "linux@horizon.com" <linux@horizon.com>, git@vger.kernel.org
Subject: Re: A look at some alternative PACK file encodings
Date: Thu, 07 Sep 2006 10:22:54 -0700 [thread overview]
Message-ID: <4500556E.7070803@gmail.com> (raw)
In-Reply-To: <9e4733910609070557jd8cfc57nd4f7a8973b69f6ed@mail.gmail.com>
Jon Smirl wrote:
> On 7 Sep 2006 05:07:56 -0400, linux@horizon.com <linux@horizon.com> wrote:
>> > Support for 'thin' packs would pretty much require mixing IDs and
>> > (relative) offsets in the same pack file.
>>
>> An alternative would be to create a small "placeholder" object that
>> just gives an ID, then refer to it by offset.
>>
>> That would avoid the need for an id/offset bit with every offset,
>> and possibly save more space if the same object was referenced
>> multiple times.
>>
>> And it just seems simpler.
>
> There are 2 million objects in the Mozilla pack. This table would take:
> 2M * (20b (sha) + 10b(object index/overhead) = 60MB
> This 60MB is pretty much incompressible and increases download time.
>
> Much better if storage of the sha1s can be totally eliminated and
> replaced by something smaller. Alternatively this map could be
> stripped for transmission and rebuilt locally.
>
You've lost me. What are you attempting to do again?
next prev parent reply other threads:[~2006-09-07 17:23 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-07 9:07 A look at some alternative PACK file encodings linux
2006-09-07 12:57 ` Jon Smirl
2006-09-07 13:34 ` linux
2006-09-07 14:19 ` Jon Smirl
2006-09-07 15:01 ` linux
2006-09-07 14:39 ` Richard Curnow
2006-09-07 17:40 ` Junio C Hamano
2006-09-07 17:22 ` A Large Angry SCM [this message]
2006-09-07 17:32 ` Nicolas Pitre
2006-09-07 19:22 ` linux
-- strict thread matches above, loose matches on Subject: below --
2006-09-07 8:41 linux
2006-09-07 17:20 ` Nicolas Pitre
2006-09-07 19:16 ` linux
2006-09-06 21:47 A Large Angry SCM
2006-09-06 23:23 ` Jon Smirl
2006-09-06 23:39 ` A Large Angry SCM
2006-09-06 23:56 ` Linus Torvalds
2006-09-07 0:10 ` Jon Smirl
2006-09-07 0:06 ` David Lang
2006-09-07 0:19 ` A Large Angry SCM
2006-09-07 0:45 ` Linus Torvalds
2006-09-07 0:37 ` Nicolas Pitre
2006-09-07 0:04 ` Jon Smirl
2006-09-07 5:41 ` Shawn Pearce
2006-09-07 5:34 ` Shawn Pearce
2006-09-07 0:40 ` Nicolas Pitre
2006-09-07 0:59 ` Jon Smirl
2006-09-07 2:30 ` Nicolas Pitre
2006-09-07 2:33 ` A Large Angry SCM
2006-09-07 1:11 ` Junio C Hamano
2006-09-07 2:47 ` Nicolas Pitre
2006-09-07 4:33 ` Shawn Pearce
2006-09-07 5:27 ` Junio C Hamano
2006-09-07 5:46 ` Shawn Pearce
2006-09-07 18:50 ` Junio C Hamano
2006-09-07 5:21 ` Shawn Pearce
[not found] ` <9e4733910609061617m6783d6c4xaca2f9575e12d455@mail.gmail.com>
2006-09-07 5:39 ` A Large Angry SCM
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