Re: kernel.org and GIT tree rebuilding

From: Chris Mason <mason@suse.com>
Date: Jun 26, 2005, 20:52 UTC
Message-ID: <200506261652.59373.mason@suse.com>
In-Reply-To: <Pine.LNX.4.58.0506260905200.19755@ppc970.osdl.org>

On Sunday 26 June 2005 12:41, Linus Torvalds wrote:

Show 17 quoted lines

> On Fri, 24 Jun 2005, Linus Torvalds wrote:
> > yeah, it clearly needs some refining to be useful, but I think you can
> > kind of see how it would work.
>
> Ok, here's how it works.
>
>  - Pick a starting commit (or a hundred)
>
>  - Pick an ending commit (or a hundred)
>
>  - generate the list of objects in between them
>
> 	git-rev-list --object end ^start > object-list
>
>  - Pack that list of objects into an "object pack":
>
> 	git-pack-objects out < object-list

Without having read the code, the big thing that hurt performance in my early packed file work was compressing the whole packed file instead of individual sub-objects. It takes more room to compress each object, but when I compressed the whole thing read performance was quite bad.

-chris