From: Marco Costalba <mcostalba@gmail.com>
Date: Sat, 21 Apr 2007 17:06:52 GMT
Subject: Re: Why SHA are 40 bytes? (aka looking for flames)
Message-ID: <e5bfff550704211006t59cb49h179685d694a1d75a@mail.gmail.com>
In-Reply-To: <9e4733910704210837y3ac3654ekb60654ef6fc397fc@mail.gmail.com>

On 4/21/07, Jon Smirl <jonsmirl@gmail.com> wrote:
> On 4/21/07, Marco Costalba <mcostalba@gmail.com> wrote:
> > Well, why to store always the full length SHA?
>
> When Shawn gets done with full compression the SHAs would get stored
> in the packfile once  and then be replaced with a token generated from
> the compression algorithm. Compression tokens are designed to use the
> minimal number of bits depending on frequency of occurrence.
>

Currently in Lunux tree there are about 445.424 objects (git
count-objects -v), if each object has his 40 bytes name it is about
20MB to store sha *once*, probably with no real disambiguate need to
be that much.

Marco