From: Linus Torvalds <torvalds@linux-foundation.org>
To: Jeff King <peff@peff.net>
Cc: Luke Lu <git@vicaya.com>,
Christer Weinigel <christer@weinigel.se>,
Tom Tobin <korpios@korpios.com>,
git@vger.kernel.org
Subject: Re: On Tabs and Spaces
Date: Wed, 17 Oct 2007 17:59:27 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.0.999.0710171753020.26902@woody.linux-foundation.org> (raw)
In-Reply-To: <20071018003256.GA5062@coredump.intra.peff.net>
On Wed, 17 Oct 2007, Jeff King wrote:
>
> In what way does an all-space model cause people to accidentally add
> tabs, but an all-tab model does not cause people to accidentally add
> spaces?
It happens. We do de-spacification in the kernel occasionally when it is
an annoyance. Usually it shows up in patches, though - exactly because
code which adds spaces instead of tabs won't line up correctly in the
diff.
So it doesn't matter *which* one you use (all spaces or all tabs) in that
sense. But clearly tabs are *way* more common at least in any UNIX
project, and tabs really do have the advantage of being smaller.
And smaller *is* faster. Do something like this on the kernel:
GIT_PAGER= time git grep sched_fair
and then do the same thing with the kernel sources blown up by 20% by
de-tabification. Guess which one is 20% slower?
And whoever said that disk space doesn't matter doesn't know what he is
talking about. Disk space most *definitely* matters. Do the above test
with a cold-cache case, and think what 20% more IO does to you (or 20%
less disk cache).
But no, the size issues are secondary, I'm not claiming anything else.
Although I do suspect that historically, they have been primary, and have
been the thing that has resulted in the fact that tabs are so commonly
used.
Linus
next prev parent reply other threads:[~2007-10-18 1:00 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-16 6:45 On Tabs and Spaces Michael Witten
2007-10-16 7:04 ` Shawn O. Pearce
2007-10-16 7:27 ` Michael Witten
2007-10-16 17:20 ` Andreas Ericsson
2007-10-16 17:40 ` Sam Ravnborg
2007-10-16 23:09 ` Petr Baudis
2007-10-17 3:41 ` David
2007-10-17 11:32 ` Andy Parkins
2007-10-16 8:30 ` Adam Piatyszek
2007-10-16 9:04 ` Lars Hjemli
2007-10-16 10:16 ` Adam Piatyszek
2007-10-16 15:26 ` Jeffrey C. Ollie
2007-10-16 15:51 ` Michael Witten
2007-10-16 17:06 ` Jari Aalto
2007-10-16 19:20 ` Linus Torvalds
2007-10-16 19:36 ` Mike Hommey
2007-10-16 19:47 ` Linus Torvalds
2007-10-16 19:51 ` Linus Torvalds
2007-10-16 20:32 ` Matthieu Moy
2007-10-16 20:18 ` Tom Tobin
2007-10-16 23:05 ` Linus Torvalds
2007-10-16 23:51 ` Christer Weinigel
2007-10-17 0:45 ` Linus Torvalds
2007-10-17 3:08 ` Michael Witten
2007-10-17 3:29 ` Linus Torvalds
2007-10-17 7:17 ` Luke Lu
2007-10-17 9:09 ` Michael Witten
2007-10-17 10:03 ` Luke Lu
2007-10-17 10:21 ` Nikolai Weibull
2007-10-17 11:23 ` Michael Witten
2007-10-17 22:02 ` Jari Aalto
2007-10-17 22:36 ` Andreas Ericsson
2007-10-17 23:38 ` Jari Aalto
2007-10-18 4:31 ` Dmitry Torokhov
2007-10-18 8:19 ` Jari Aalto
2007-10-18 11:34 ` Petr Baudis
2007-10-18 11:39 ` Nikolai Weibull
2007-10-22 3:39 ` Miles Bader
2007-10-18 7:15 ` David Kågedal
2007-10-18 5:42 ` Mike Hommey
2007-10-18 10:36 ` Jari Aalto
2007-10-17 15:53 ` Linus Torvalds
2007-10-17 18:05 ` Johannes Schindelin
2007-10-17 18:25 ` Tom Tobin
2007-10-17 18:54 ` Linus Torvalds
2007-10-17 19:33 ` Tom Tobin
2007-10-17 19:44 ` Linus Torvalds
2007-10-17 19:48 ` Nicolas Pitre
2007-10-17 19:52 ` Josh England
2007-10-17 19:53 ` Linus Torvalds
2007-10-17 21:21 ` Christer Weinigel
2007-10-17 22:03 ` Linus Torvalds
2007-10-18 6:25 ` David Kastrup
2007-10-17 22:11 ` Johannes Schindelin
2007-10-17 23:17 ` Christer Weinigel
2007-10-17 23:44 ` Johannes Schindelin
2007-10-18 0:31 ` Christer Weinigel
2007-10-18 6:02 ` Andreas Ericsson
2007-10-18 7:12 ` David Kågedal
2007-10-17 23:53 ` Linus Torvalds
2007-10-17 20:31 ` David Kastrup
2007-10-17 21:08 ` Johannes Schindelin
2007-10-17 19:47 ` Jan Wielemaker
2007-10-18 0:32 ` Jeff King
2007-10-18 0:59 ` Linus Torvalds [this message]
2007-10-18 2:45 ` Jeff King
2007-10-18 3:03 ` david
2007-10-18 3:00 ` Jeff King
2007-10-18 3:32 ` Linus Torvalds
2007-10-18 4:17 ` Linus Torvalds
2007-10-18 3:13 ` Linus Torvalds
2007-10-18 3:23 ` Jeff King
2007-10-18 4:41 ` [PATCH] Add a message explaining that automatic GC is about to start koreth
2007-10-18 4:44 ` Steven Grimm
2007-10-18 5:01 ` Jeff King
2007-10-18 5:11 ` Shawn O. Pearce
2007-10-18 13:52 ` Brian Gernhardt
2007-10-18 14:16 ` Steven Grimm
2007-10-18 18:08 ` Jeff King
2007-10-19 0:16 ` Shawn O. Pearce
2007-10-19 1:12 ` [PATCH] git-gc: improve wording of --auto notification Jeff King
2007-10-19 1:24 ` Shawn O. Pearce
2007-10-19 1:26 ` Jeff King
2007-10-18 14:21 ` [PATCH] Add a message explaining that automatic GC is about to start Nicolas Pitre
2007-10-18 4:52 ` On Tabs and Spaces Nicolas Pitre
2007-10-18 4:54 ` Jeff King
2007-10-18 4:55 ` Jeff King
2007-10-17 16:08 ` David Kastrup
2007-10-17 17:44 ` Nicolas Pitre
2007-10-17 19:52 ` David Kastrup
2007-10-17 17:51 ` Sean
2007-10-17 5:56 ` David Kastrup
2007-10-16 20:56 ` Sam Ravnborg
2007-10-18 3:31 ` Paul Wankadia
2007-10-18 4:22 ` Linus Torvalds
2007-10-18 4:36 ` Dmitry Potapov
2007-10-16 17:23 ` Andreas Ericsson
2007-10-16 18:34 ` Jan-Benedict Glaw
2007-10-16 18:51 ` Andreas Ericsson
2007-10-20 13:54 ` Robin Rosenberg
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