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From: Linus Torvalds <torvalds@linux-foundation.org>
To: "René Scharfe" <rene.scharfe@lsrfire.ath.cx>
Cc: Jakub Narebski <jnareb@gmail.com>,
	Brendan Miller <catphive@catphive.net>,
	git@vger.kernel.org
Subject: Re: obnoxious CLI complaints
Date: Fri, 11 Sep 2009 07:47:01 -0700 (PDT)	[thread overview]
Message-ID: <alpine.LFD.2.01.0909110744030.3654@localhost.localdomain> (raw)
In-Reply-To: <4AA97B61.6030301@lsrfire.ath.cx>



On Fri, 11 Sep 2009, René Scharfe wrote:
> 
> Using zlib directly avoids the overhead of a pipe and of buffering the
> output for blocked writes; surprisingly (to me), it isn't any faster.

In fact, it should be slower.

On SMP, you're quite likely better off using the pipe, and compressing on 
another CPU. Of course, it's usually the case that the compression is _so_ 
much slower than generating the tar-file (especially for the hot-cache 
case) that it doesn't matter or the pipe overhead is even a slowdown.

But especially if generating the tar-file has some delays in it 
(cold-cache object lookup, whatever), the "compress in separate process" 
is likely simply better, because you can compress while the other process 
is looking up data for the tar.

				Linus

  reply	other threads:[~2009-09-11 14:48 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-09-09 21:27 obnoxious CLI complaints Brendan Miller
2009-09-09 21:54 ` Jakub Narebski
2009-09-09 22:06   ` Wincent Colaiuta
2009-09-10 16:50     ` Jakub Narebski
2009-09-10 18:53       ` Junio C Hamano
2009-09-10 22:19         ` René Scharfe
2009-09-11  3:15         ` Björn Steinbrink
2009-09-10 19:46       ` John Tapsell
2009-09-10 20:17         ` Sverre Rabbelier
2009-09-10 20:23         ` Jakub Narebski
2009-09-10 22:04           ` John Tapsell
2009-09-10 22:49             ` Junio C Hamano
2009-09-10 23:19               ` demerphq
2009-09-11  0:37                 ` Junio C Hamano
2009-09-11  0:18               ` John Tapsell
2009-09-11  0:25                 ` Junio C Hamano
2009-09-10  0:09   ` Brendan Miller
2009-09-10  1:25     ` Todd Zullinger
2009-09-10  9:16     ` Jakub Narebski
2009-09-10 18:18       ` Eric Schaefer
2009-09-10 18:52         ` Sverre Rabbelier
2009-09-10 22:19       ` René Scharfe
2009-09-11 14:47         ` Linus Torvalds [this message]
2009-09-11 22:01           ` René Scharfe
2009-09-11 22:16             ` Linus Torvalds
2009-09-12 10:31     ` Dmitry Potapov
2009-09-12 18:32       ` John Tapsell
2009-09-12 21:44         ` Dmitry Potapov
2009-09-12 22:21           ` John Tapsell
2009-09-12 22:35             ` A Large Angry SCM
2009-09-12 22:43             ` Dmitry Potapov
2009-09-12 23:08               ` John Tapsell
2009-09-13  2:47                 ` Junio C Hamano
2009-09-13 17:36                   ` [PATCH 1/2] git-archive: add '-o' as a alias for '--output' Dmitry Potapov
2009-09-13 17:36                     ` [PATCH 2/2] teach git-archive to auto detect the output format Dmitry Potapov
2009-09-13 18:52                       ` Junio C Hamano
2009-09-13 20:17                         ` [PATCH v2 " Dmitry Potapov
2009-09-13 21:27                           ` Junio C Hamano
2009-09-13 18:34                     ` [PATCH 1/2] git-archive: add '-o' as a alias for '--output' Junio C Hamano
2009-09-13 20:13                       ` [PATCH v2 " Dmitry Potapov
2009-09-17  0:48                   ` obnoxious CLI complaints Brendan Miller
2009-09-17  1:27                     ` Junio C Hamano
2009-09-09 21:58 ` Sverre Rabbelier
2009-09-09 22:58 ` Pierre Habouzit
2009-09-10  1:32 ` Björn Steinbrink
2009-09-10 18:54   ` Matthieu Moy

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