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From: Pavel Machek <pavel@suse.cz>
To: Olivier Galibert <galibert@pobox.com>, linux-kernel@vger.kernel.org
Subject: Re: BitBucket: GPL-ed KitBeeper clone
Date: Fri, 7 Mar 2003 13:32:37 +0100	[thread overview]
Message-ID: <20030307123237.GG18420@atrey.karlin.mff.cuni.cz> (raw)
In-Reply-To: <20030307121215.GA68353@dspnet.fr.eu.org>

Hi!

> > Can you elaborate? I thought that this
> > "real DAG" structure is more or less
> > equivalent to each developer having
> > his owm CVS repository...
> 
> Nope.  CVS uses RCS, and RCS only knows about trees, not graphs.
> Specifically, branch merges are not tagged as such, and as a result
> CVS is unable to pick up the best grandparent when doing a merge.
> That's the main reason of why branching under CVS is so painful
> (forgetting about the performance issues).

I see. But I still somehow can not understand how merging is
possible. Merge possibly means work-by-hand, right? So it is not as
simple as noting that 1.8 and 1.7.1.1 were merged into 1.9, no? [And
what if developer did really crap job at merging that, like dropping
all changes from 1.7.1.1?]

> > If I fixed CVS renames, added atomic
> > commits, splits and merges, and gave each
> > developer his own CVS repository,
> > would I be in same league as bk?
> > Ie 10 times slower but equivalent
> > functionality?
> 
> Nope.  You'll find out that this per-developper repository quickly
> needs to become a per-branch repository, and even need you need to
> write somewhere when the merges with other repositories happen, and
> you end up with the DAG again.

Yep, that's what I wanted to know. [I see per-branch repository is
pain, but it helps me to understand that.]

Thanx for your explanations,
							Pavel
-- 
Horseback riding is like software...
...vgf orggre jura vgf serr.

  reply	other threads:[~2003-03-07 12:22 UTC|newest]

Thread overview: 199+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-03-02  0:11 BitBucket: GPL-ed KitBeeper clone Adam J. Richter
2003-03-02  0:20 ` Larry McVoy
2003-03-02  0:20 ` David Lang
2003-03-02  0:49 ` Arador
2003-03-02  1:03   ` Jeff Garzik
2003-03-02  2:15   ` Alan Cox
2003-03-02  1:19     ` Jeff Garzik
2003-03-02  1:40       ` BitBucket: GPL-ed *notrademarkhere* clone Andrea Arcangeli
2003-03-02  1:45         ` Jeff Garzik
2003-03-02  2:09           ` Andrea Arcangeli
2003-03-02 17:28             ` Jeff Garzik
2003-03-02 18:16               ` Andrea Arcangeli
2003-03-02 20:12                 ` Jeff Garzik
2003-03-02 21:49                   ` Geert Uytterhoeven
2003-03-03 18:37                 ` Larry McVoy
2003-03-03 18:46                   ` Larry McVoy
2003-03-03 22:57                   ` Andrea Arcangeli
2003-03-03 23:14                     ` Pavel Machek
2003-03-03 23:56                     ` David Lang
2003-03-04  0:02                       ` Jeff Garzik
2003-03-04  0:05                         ` Larry McVoy
2003-03-04  0:15                         ` Andrea Arcangeli
2003-03-04  0:30                           ` Jeff Garzik
2003-03-04  2:20                       ` Martin J. Bligh
2003-03-04  5:29                         ` Linus Torvalds
2003-03-04  5:56                           ` Dimitrie O. Paun
2003-03-04 14:51                             ` Jeff Garzik
2003-03-02  3:29           ` H. Peter Anvin
2003-03-02 17:12             ` Jeff Garzik
2003-03-02 18:39               ` H. Peter Anvin
2003-03-02 20:01                 ` Jeff Garzik
2003-03-03  0:47               ` nickn
2003-03-03  0:55                 ` David Lang
2003-03-03  2:31                   ` Jeff Garzik
2003-03-03  2:32                 ` Jeff Garzik
2003-03-04  1:07                   ` Horst von Brand
2003-03-04  1:10                     ` H. Peter Anvin
2003-03-03 21:53               ` Joel Becker
2003-03-04 23:37                 ` Olaf Hering
2003-03-06 16:47                 ` Pavel Machek
2003-03-06 16:41               ` Pavel Machek
2003-03-07 11:24                 ` Tupshin Harper
2003-03-07 11:28                   ` Pavel Machek
2003-03-07 21:53                 ` H. Peter Anvin
2003-03-08 23:18                   ` Daniel Phillips
2003-03-03  0:13           ` Pavel Machek
2003-03-03  0:10       ` BitBucket: GPL-ed KitBeeper clone Pavel Machek
2003-03-04 16:16         ` David Woodhouse
2003-03-04 16:27           ` Pavel Machek
2003-03-02  1:26 ` Olivier Galibert
2003-03-06 16:18   ` Pavel Machek
2003-03-07 12:12     ` Olivier Galibert
2003-03-07 12:32       ` Pavel Machek [this message]
2003-03-07 16:54         ` Olivier Galibert
2003-03-07 17:14           ` Geert Uytterhoeven
2003-03-07 19:08           ` Pavel Machek
2003-03-07 19:25             ` Eli Carter
2003-03-07 20:29               ` Pavel Machek
2003-03-07 23:16             ` Linus Torvalds
2003-03-08 22:52               ` Zack Brown
2003-03-09  0:05                 ` Larry McVoy
2003-03-09  1:21                   ` Davide Libenzi
2003-03-09  2:45                   ` Zack Brown
2003-03-09  3:19                     ` Roman Zippel
2003-03-09  3:42                       ` Linus Torvalds
2003-03-09  4:32                         ` Roman Zippel
2003-03-09 13:34                           ` Eric W. Biederman
2003-03-09 15:35                             ` Roman Zippel
2003-03-09 16:55                               ` Martin J. Bligh
2003-03-09 17:20                                 ` Zack Brown
2003-03-09 17:48                                   ` Martin J. Bligh
2003-03-09 19:58                                   ` Larry McVoy
2003-03-09 21:32                                     ` Zack Brown
2003-03-09 21:54                                       ` Valdis.Kletnieks
2003-03-09 23:28                                         ` Larry McVoy
2003-03-13 20:00                                     ` Pavel Machek
2003-03-09 17:39                                 ` Linus Torvalds
2003-03-09 17:58                                   ` Martin J. Bligh
2003-03-09 18:20                                   ` Larry McVoy
2003-03-09 23:19                                     ` fs
2003-03-13  0:41                                     ` Pavel Machek
2003-03-13 21:21                                       ` Horst von Brand
2003-03-09 20:01                                   ` Roman Zippel
2003-03-13  0:13                             ` Pavel Machek
2003-03-09 14:49                         ` Olivier Galibert
2003-03-13  0:05                         ` Pavel Machek
2003-03-10  0:02                     ` Thoughts about ideal kernel SCM Petr Baudis
2003-03-10  0:32                       ` Larry McVoy
2003-03-12 19:29                         ` Petr Baudis
2003-03-13 10:36                       ` Pavel Machek
2003-03-14 22:56                         ` Petr Baudis
2003-03-17 20:59                       ` Petr Baudis
2003-03-10  3:41                     ` BitBucket: GPL-ed KitBeeper clone Horst von Brand
2003-03-10 13:52                       ` Jamie Lokier
2003-03-10 23:03                     ` Daniel Phillips
2003-03-11 18:40                       ` Zack Brown
2003-03-11 18:46                         ` Martin J. Bligh
2003-03-11 19:30                           ` Daniel Phillips
2003-03-11 19:33                             ` Martin J. Bligh
2003-03-11 20:08                               ` Andrew Morton
2003-03-11 20:29                                 ` Martin J. Bligh
2003-03-12  6:14                             ` Werner Almesberger
2003-03-13  2:48                               ` Daniel Phillips
2003-03-13  3:11                                 ` Werner Almesberger
2003-03-14 12:29                             ` Pavel Machek
2003-03-15 20:53                               ` Martin J. Bligh
2003-03-15 21:26                               ` Daniel Phillips
2003-03-15 21:32                               ` Petr Baudis
2003-03-15 23:39                                 ` Petr Baudis
2003-03-16  0:39                               ` Horst von Brand
2003-04-07 21:22                               ` Petr Baudis
2003-03-12  3:47                         ` Horst von Brand
2003-03-12  4:03                           ` Larry McVoy
2003-03-12  4:49                             ` [PATCH] ~/kernel/sys.c (2.5.64) (trivial) Jay Patrick Howard
2003-03-12  5:22                           ` BitBucket: GPL-ed KitBeeper clone Zack Brown
2003-03-12  5:44                             ` Horst von Brand
2003-03-12 13:48                               ` Daniel Phillips
2003-03-13  1:03                                 ` Horst von Brand
2003-03-13 16:53                                   ` Daniel Phillips
2003-03-15 15:02                                     ` Horst von Brand
2003-03-15 21:25                                       ` Daniel Phillips
2003-03-12  6:19                             ` Werner Almesberger
2003-03-13  1:31                               ` Horst von Brand
2003-03-12 15:32                             ` Horst von Brand
2003-03-12 16:13                               ` Daniel Phillips
2003-03-12 20:37                                 ` Horst von Brand
2003-03-12 20:54                                   ` H. Peter Anvin
2003-03-13  2:00                                   ` Daniel Phillips
2003-03-15  1:03                                     ` Horst von Brand
2003-03-12 13:22                           ` Daniel Phillips
2003-03-13  0:52                             ` Horst von Brand
2003-03-13 17:00                               ` Daniel Phillips
2003-03-13 21:48                                 ` Zack Brown
2003-03-13 22:04                                   ` Daniel Phillips
2003-03-15 16:21                                 ` Horst von Brand
2003-03-15 21:25                                   ` Daniel Phillips
2003-03-15 21:53                                     ` Robert Anderson
2003-03-15 21:50                                       ` Randy.Dunlap
2003-03-15 22:16                                         ` Robert Anderson
2003-03-15 22:18                                         ` Robert Anderson
2003-03-16  0:18                                       ` Petr Baudis
2003-03-16  0:53                                         ` Davide Libenzi
2003-03-16  0:55                                         ` [arch-users] " Stig Brautaset
2003-03-16  1:44                                         ` Tom Lord
2003-03-16  2:06                                           ` Adam Spiers
2003-03-16  3:28                                             ` David Lang
2003-03-16  5:43                                         ` Robert Anderson
2003-03-16 11:57                                         ` (Re: BitBucket: GPL-ed KitBeeper clone) Moving to arch-users Petr Baudis
2003-03-14 11:34                         ` BitBucket: GPL-ed KitBeeper clone Pavel Machek
2003-03-12 23:38                     ` Pavel Machek
2003-03-09  2:06             ` Horst von Brand
     [not found]             ` <b4b98v_14m_1@penguin.transmeta.com>
2003-03-12 23:23               ` Pavel Machek
2003-03-13 21:15                 ` Horst von Brand
2003-03-08  0:18       ` Olaf Dietsche
2003-03-02  1:37 ` Filip Van Raemdonck
  -- strict thread matches above, loose matches on Subject: below --
2003-04-08 17:52 Chuck Ebbert
2003-04-08 18:02 ` Larry McVoy
2003-04-08 23:19   ` Jamie Lokier
2003-04-09  0:47     ` Larry McVoy
2003-04-09  1:34       ` Jamie Lokier
2003-04-09  1:43       ` Robert White
2003-04-09  2:09     ` Mark Mielke
2003-04-09 13:14       ` Mr. James W. Laferriere
2003-04-09 13:35         ` Matti Aarnio
2003-04-08 13:06 Chuck Ebbert
2003-04-07 23:57 Chuck Ebbert
2003-04-08  0:30 ` Larry McVoy
     [not found] <1047571030.5373.161.camel@passion.cambridge.redhat.com>
2003-03-15 14:17 ` Horst von Brand
2003-03-15 18:48   ` Larry McVoy
2003-03-15 18:51   ` David Woodhouse
     [not found] <20030309001008$2ed5@gated-at.bofh.it>
     [not found] ` <20030309001008$4e61@gated-at.bofh.it>
     [not found]   ` <20030309001008$0732@gated-at.bofh.it>
     [not found]     ` <20030309001008$747c@gated-at.bofh.it>
     [not found]       ` <20030309001008$6342@gated-at.bofh.it>
2003-03-15 10:47         ` Kai Henningsen
2003-03-13 16:21 Ed Vance
2003-03-15 14:31 ` Horst von Brand
2003-03-12 19:00 Kaz Kylheku
2003-03-03 17:02 Adam J. Richter
2003-03-02  2:23 Adam J. Richter
2003-03-03 15:26 ` Edward S. Marshall
2003-03-03 23:06   ` Daniel Phillips
2003-02-26 20:02 BitBucket: GPL-ed BitKeeper clone Pavel Machek
2003-03-01 18:05 ` BitBucket: GPL-ed KitBeeper clone Pavel Janík
2003-03-01 18:39   ` Christoph Hellwig
2003-03-01 22:43     ` Pavel Janík
2003-03-02  9:11       ` Christoph Hellwig
2003-03-02  9:30         ` John Bradford
2003-03-02  9:32           ` Christoph Hellwig
2003-03-03 12:39           ` Pavel Machek
2003-03-03 14:12           ` Alan Cox
2003-03-03 13:57             ` John Bradford
2003-03-03 14:22               ` Richard B. Johnson
2003-03-03 15:08                 ` John Bradford
2003-03-03 17:50                   ` David Lang
2003-03-03 19:37                   ` Pavel Machek
2003-03-03 19:49                     ` John Bradford
2003-03-03 14:22               ` Charles Cazabon
2003-03-02  9:57         ` Pavel Janík
2003-03-03  8:05       ` Helge Hafting
2003-03-03  8:28         ` Bernd Eckenfels
2003-03-01 20:58   ` Paul Fulghum
2003-03-02  4:52     ` Mike Galbraith
2003-03-03  0:02   ` Pavel Machek

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