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From: Linus Torvalds <torvalds@osdl.org>
To: Matt Mackall <mpm@selenic.com>
Cc: Sean <seanlkml@sympatico.ca>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	git@vger.kernel.org
Subject: Re: Mercurial 0.4b vs git patchbomb benchmark
Date: Fri, 29 Apr 2005 07:34:15 -0700 (PDT)
Message-ID: <Pine.LNX.4.58.0504290728090.18901@ppc970.osdl.org> (raw)
In-Reply-To: <20050429074043.GT21897@waste.org>



On Fri, 29 Apr 2005, Matt Mackall wrote:
> 
> Mercurial is even younger (Linus had a few days' head start, not to
> mention a bunch of help), and it is already as fast as git, relatively
> easy to use, much simpler, and much more space and bandwidth
> efficient.

You've not mentioned two out of my three design goals:
 - distribution
 - reliability/trustability

ie does mercurial do distributed merges, which git was designed for, and 
does mercurial notice single-bit errors in a reasonably secure manner, or 
can people just mess with history willy-nilly?

For the latter, the cryptographic nature of sha1 is an added bonus - the
_big_ issue is that it is a good hash, and an _exteremely_ effective CRC
of the data. You can't mess up an archive and lie about it later. And if
you have random memory or filesystem corruption, it's not a "shit happens"  
kind of situation - it's a "uhhoh, we can catch it (and hopefully even fix
it, thanks to distribution)" thing.

I had three design goals. "disk space" wasn't one of them, so you've
concentrated on only one so far in your arguments.

		Linus

  parent reply index

Thread overview: 106+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-04-26  0:41 Mercurial 0.3 vs git benchmarks Matt Mackall
2005-04-26  1:49 ` Daniel Phillips
2005-04-26  2:08 ` Linus Torvalds
2005-04-26  2:30   ` Mike Taht
2005-04-26  3:04     ` Linus Torvalds
2005-04-26  4:00       ` Linus Torvalds
2005-04-26 11:13         ` Chris Mason
2005-04-26 15:09           ` Magnus Damm
2005-04-26 15:38             ` Chris Mason
2005-04-26 16:23               ` Magnus Damm
2005-04-26 18:18                 ` Chris Mason
2005-04-26 20:56                 ` Andrew Morton
2005-04-26 21:07                   ` Linus Torvalds
2005-04-26 22:50                     ` H. Peter Anvin
2005-04-26 22:56                     ` Andrew Morton
2005-04-26 23:43                       ` H. Peter Anvin
2005-04-27 15:01                         ` Florian Weimer
2005-04-27 15:13                           ` Thomas Glanzmann
2005-04-27 18:54                             ` H. Peter Anvin
2005-04-27 19:01                               ` Thomas Glanzmann
2005-04-27 19:57                                 ` Theodore Ts'o
2005-04-27 20:06                                   ` Thomas Glanzmann
2005-04-27 20:35                                 ` H. Peter Anvin
2005-04-27 20:39                                   ` Thomas Glanzmann
2005-04-27 20:47                                   ` Florian Weimer
2005-04-27 20:55                                 ` Florian Weimer
2005-04-27 21:04                                   ` H. Peter Anvin
2005-04-27 21:06                                     ` Florian Weimer
2005-04-27 21:32                                       ` Theodore Ts'o
2005-04-27 19:55                       ` Theodore Ts'o
2005-04-27  6:34                   ` Ingo Molnar
2005-04-27 21:10                     ` Bill Davidsen
2005-04-27 21:39                       ` Linus Torvalds
2005-04-26 16:42           ` Linus Torvalds
2005-04-26 17:39             ` Chris Mason
2005-04-26 19:52               ` Chris Mason
2005-04-26 18:15         ` H. Peter Anvin
2005-04-26 20:30           ` Bill Davidsen
2005-04-26 16:11       ` Bill Davidsen
2005-04-26  4:01   ` Matt Mackall
2005-04-26  4:20     ` Linus Torvalds
2005-04-26  4:09   ` Chris Wedgwood
2005-04-26  4:22     ` Andreas Gal
2005-04-26  4:22     ` Linus Torvalds
2005-04-29  6:01   ` Mercurial 0.4b vs git patchbomb benchmark Matt Mackall
2005-04-29  6:40     ` Sean
2005-04-29  7:40       ` Matt Mackall
2005-04-29  8:40         ` Sean
2005-04-29 14:34         ` Linus Torvalds [this message]
2005-04-29 15:18           ` Morten Welinder
2005-04-29 16:52             ` Matt Mackall
2005-05-02 16:10               ` Bill Davidsen
2005-05-02 19:02                 ` Sean
2005-05-02 22:02                 ` Linus Torvalds
2005-05-02 22:30                   ` Matt Mackall
2005-05-02 22:49                     ` Linus Torvalds
2005-05-03  0:00                       ` Matt Mackall
2005-05-03  2:48                         ` Linus Torvalds
2005-05-03  3:29                           ` Matt Mackall
2005-05-03  4:18                             ` Linus Torvalds
2005-05-03  4:24                         ` Linus Torvalds
2005-05-03  4:27                           ` Matt Mackall
2005-05-03  8:45                           ` Chris Wedgwood
2005-04-29 15:44           ` Tom Lord
2005-04-29 15:58             ` Linus Torvalds
2005-04-29 17:34               ` Tom Lord
2005-04-29 17:56                 ` Linus Torvalds
2005-04-29 18:08                   ` Tom Lord
2005-04-29 18:33                     ` Sean
2005-04-29 18:54                       ` Tom Lord
2005-04-29 19:13                         ` Sean
2005-05-02 16:15                           ` Bill Davidsen
2005-04-29 16:37           ` Matt Mackall
2005-04-29 17:09             ` Linus Torvalds
2005-04-29 19:12               ` Matt Mackall
2005-04-29 19:50                 ` Linus Torvalds
2005-04-29 20:23                   ` Matt Mackall
2005-04-29 20:49                     ` Linus Torvalds
2005-04-29 21:20                       ` Matt Mackall
2005-04-29 16:46           ` Bill Davidsen
2005-04-29 20:19       ` Andrea Arcangeli
2005-04-29 22:30         ` Olivier Galibert
2005-04-29 22:47           ` Andrea Arcangeli
2005-04-29 20:30     ` Andrea Arcangeli
2005-04-29 20:39       ` Matt Mackall
2005-04-30  2:52         ` Andrea Arcangeli
2005-04-30 15:20           ` Matt Mackall
2005-04-30 16:37             ` Andrea Arcangeli
2005-05-02 15:49           ` Bill Davidsen
2005-05-02 16:14             ` Valdis.Kletnieks
2005-05-03 17:40               ` Bill Davidsen
2005-05-04  2:10                 ` Mercurial 0.4b vs git patchbomb benchmark (/usr/bin/env again) David A. Wheeler
2005-05-02 16:17             ` Mercurial 0.4b vs git patchbomb benchmark Andrea Arcangeli
2005-05-02 16:31             ` Linus Torvalds
2005-05-02 17:18               ` Daniel Jacobowitz
2005-05-02 17:32                 ` Linus Torvalds
2005-05-02 20:54                 ` Sam Ravnborg
2005-05-02 17:20               ` Ryan Anderson
2005-05-02 17:31                 ` Linus Torvalds
2005-05-02 21:17               ` Kyle Moffett
2005-05-03 17:43               ` Bill Davidsen
     [not found] <3YQn9-8qX-5@gated-at.bofh.it>
     [not found] ` <3ZLEF-56n-1@gated-at.bofh.it>
     [not found]   ` <3ZM7L-5ot-13@gated-at.bofh.it>
     [not found]     ` <3ZN3P-69A-9@gated-at.bofh.it>
     [not found]       ` <3ZNdz-6gK-9@gated-at.bofh.it>
2005-05-03  1:16         ` Bodo Eggert <harvested.in.lkml
2005-05-03  1:29           ` Matt Mackall
2005-05-03 16:22             ` Bill Davidsen
2005-05-03 17:14               ` Rene Scharfe
2005-05-04 17:51                 ` Bill Davidsen

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