From: Linus Torvalds <torvalds@linux-foundation.org>
To: Jakub Narebski <jnareb@gmail.com>
Cc: "Carlos R. Mafra" <crmafra2@gmail.com>, git@vger.kernel.org
Subject: Re: Performance issue of 'git branch'
Date: Thu, 23 Jul 2009 09:25:06 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.2.01.0907230922530.21520@localhost.localdomain> (raw)
In-Reply-To: <m3prbr371l.fsf@localhost.localdomain>
On Thu, 23 Jul 2009, Jakub Narebski wrote:
>
> BTW. Would SystemTap help there? Among contributed scripts there is
> iotimes, so perhaps it would be possible to have iotrace...
The problem I've had with all iotracers is that it's easy enough to get an
IO trace, but it's basically almost impossible to integrate it with what
actually _caused_ the IO.
Using 'strace -T' shows very clearly what operations are taking a long
time. It's very useful for seeing what you should not do for good
performance - including IO - and where it comes from. It's just that page
faults are invisible to it.
Linus
next prev parent reply other threads:[~2009-07-23 16:25 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-22 23:59 Performance issue of 'git branch' Carlos R. Mafra
2009-07-23 0:21 ` Linus Torvalds
2009-07-23 0:51 ` Linus Torvalds
2009-07-23 0:55 ` Linus Torvalds
2009-07-23 2:02 ` Carlos R. Mafra
2009-07-23 2:28 ` Linus Torvalds
2009-07-23 12:42 ` Jakub Narebski
2009-07-23 14:45 ` Carlos R. Mafra
2009-07-23 16:25 ` Linus Torvalds [this message]
2009-07-23 1:22 ` Carlos R. Mafra
2009-07-23 2:20 ` Linus Torvalds
2009-07-23 2:23 ` Linus Torvalds
2009-07-23 3:08 ` Linus Torvalds
2009-07-23 3:21 ` Linus Torvalds
2009-07-23 17:47 ` Tony Finch
2009-07-23 18:57 ` Linus Torvalds
2009-07-23 22:48 ` Newton-Raphson, was " Tony Finch
2009-07-23 23:24 ` Johannes Schindelin
2009-07-23 23:50 ` Tony Finch
2009-07-24 0:43 ` Johannes Schindelin
2009-07-23 3:18 ` Carlos R. Mafra
2009-07-23 3:27 ` Carlos R. Mafra
2009-07-23 3:40 ` Carlos R. Mafra
2009-07-23 3:47 ` Linus Torvalds
2009-07-23 4:10 ` Linus Torvalds
2009-07-23 5:13 ` Junio C Hamano
2009-07-23 5:17 ` Carlos R. Mafra
2009-07-23 4:40 ` Junio C Hamano
2009-07-23 5:36 ` Linus Torvalds
2009-07-23 5:52 ` Junio C Hamano
2009-07-23 6:04 ` Junio C Hamano
2009-07-23 17:19 ` Linus Torvalds
2009-07-23 16:07 ` Carlos R. Mafra
2009-07-23 16:19 ` Linus Torvalds
2009-07-23 16:53 ` Carlos R. Mafra
2009-07-23 19:05 ` Linus Torvalds
2009-07-23 19:13 ` Linus Torvalds
2009-07-23 19:55 ` Carlos R. Mafra
2009-07-24 20:36 ` Linus Torvalds
2009-07-24 20:47 ` Linus Torvalds
2009-07-24 21:21 ` Linus Torvalds
2009-07-24 22:13 ` Linus Torvalds
2009-07-24 22:18 ` david
2009-07-24 22:42 ` Linus Torvalds
2009-07-24 22:46 ` david
2009-07-25 2:39 ` Linus Torvalds
2009-07-25 2:53 ` Daniel Barkalow
2009-08-07 4:21 ` Jeff King
2009-07-24 22:54 ` Theodore Tso
2009-07-24 22:59 ` Shawn O. Pearce
2009-07-24 23:28 ` Junio C Hamano
2009-07-26 17:07 ` Avi Kivity
2009-07-26 17:16 ` Johannes Schindelin
2009-07-24 23:46 ` Carlos R. Mafra
2009-07-25 0:41 ` Carlos R. Mafra
2009-07-25 18:04 ` Linus Torvalds
2009-07-25 18:57 ` Timo Hirvonen
2009-07-25 19:06 ` Reece Dunn
2009-07-25 20:31 ` Mike Hommey
2009-07-25 21:02 ` Linus Torvalds
2009-07-25 21:13 ` Linus Torvalds
2009-07-25 23:23 ` Johannes Schindelin
2009-07-26 4:49 ` Linus Torvalds
2009-07-26 16:29 ` Theodore Tso
2009-07-26 7:54 ` Mike Hommey
2009-07-26 10:16 ` Johannes Schindelin
2009-07-26 10:23 ` demerphq
2009-07-26 10:27 ` demerphq
2009-07-25 21:04 ` Carlos R. Mafra
2009-07-23 16:48 ` Anders Kaseorg
2009-07-23 19:03 ` Carlos R. Mafra
2009-07-23 0:23 ` SZEDER Gábor
2009-07-23 2:25 ` Carlos R. Mafra
-- strict thread matches above, loose matches on Subject: below --
2009-07-26 23:21 George Spelvin
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