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From: Chris Mason <mason@suse.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Jeff Garzik <jgarzik@pobox.com>,
	"David S. Miller" <davem@davemloft.net>,
	Git Mailing List <git@vger.kernel.org>,
	Nicolas Pitre <nico@cam.org>
Subject: Re: kernel.org and GIT tree rebuilding
Date: Sun, 26 Jun 2005 16:52:57 -0400	[thread overview]
Message-ID: <200506261652.59373.mason@suse.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0506260905200.19755@ppc970.osdl.org>

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

  parent reply	other threads:[~2005-06-26 20:46 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-06-25  4:20 kernel.org and GIT tree rebuilding David S. Miller
2005-06-25  4:40 ` Jeff Garzik
2005-06-25  5:23   ` Linus Torvalds
2005-06-25  5:48     ` Jeff Garzik
2005-06-25  6:16       ` Linus Torvalds
2005-06-26 16:41         ` Linus Torvalds
2005-06-26 18:39           ` Junio C Hamano
2005-06-26 19:19             ` Linus Torvalds
2005-06-26 19:45               ` Junio C Hamano
     [not found]                 ` <7v1x6om6o5.fsf@assigned-by-dhcp.cox.net>
     [not found]                   ` <Pine.LNX.4.58.0506271227160.19755@ppc970.osdl.org>
     [not found]                     ` <7v64vzyqyw.fsf_-_@assigned-by-dhcp.cox.net>
2005-06-28  6:56                       ` [PATCH] Obtain sha1_file_info() for deltified pack entry properly Junio C Hamano
2005-06-28  6:58                         ` Junio C Hamano
2005-06-28  6:58                         ` [PATCH 2/3] git-cat-file: use sha1_object_info() on '-t' Junio C Hamano
2005-06-28  6:59                         ` [PATCH 3/3] git-cat-file: '-s' to find out object size Junio C Hamano
2005-06-26 20:52           ` Chris Mason [this message]
2005-06-26 21:03             ` kernel.org and GIT tree rebuilding Chris Mason
2005-06-26 21:40             ` Linus Torvalds
2005-06-26 22:34               ` Linus Torvalds
2005-06-28 18:06           ` Nicolas Pitre
2005-06-28 19:28             ` Linus Torvalds
2005-06-28 21:08               ` Nicolas Pitre
2005-06-28 21:27                 ` Linus Torvalds
2005-06-28 21:55                   ` [PATCH] Bugfix: initialize pack_base to NULL Junio C Hamano
2005-06-29  3:55                   ` kernel.org and GIT tree rebuilding Nicolas Pitre
2005-06-29  5:16                     ` Nicolas Pitre
2005-06-29  5:43                       ` Linus Torvalds
2005-06-29  5:54                         ` Linus Torvalds
2005-06-29  7:16                           ` Last mile for 1.0 again Junio C Hamano
2005-06-29  9:51                             ` [PATCH] Add git-verify-pack command Junio C Hamano
2005-06-29 16:15                               ` Linus Torvalds
2005-07-04 21:40                             ` Last mile for 1.0 again Daniel Barkalow
2005-07-04 21:45                               ` Junio C Hamano
2005-07-04 21:59                               ` Linus Torvalds
2005-07-04 22:41                                 ` Daniel Barkalow
2005-07-04 23:06                                   ` Junio C Hamano
2005-07-05  1:54                                     ` Daniel Barkalow
2005-07-05  6:24                                       ` Junio C Hamano
2005-07-05 13:34                                         ` Marco Costalba
2005-06-25  5:04 ` kernel.org and GIT tree rebuilding Junio C Hamano
  -- strict thread matches above, loose matches on Subject: below --
2005-07-03  2:51 linux

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