From: Rogier Wolff <R.E.Wolff@BitWizard.nl>
To: Jeff Layton <jlayton@redhat.com>
Cc: 焦晓冬 <milestonejxd@gmail.com>,
bfields@fieldses.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: POSIX violation by writeback error
Date: Wed, 5 Sep 2018 14:07:46 +0200 [thread overview]
Message-ID: <20180905120745.GP17123@BitWizard.nl> (raw)
In-Reply-To: <09ba078797a1327713e5c2d3111641246451c06e.camel@redhat.com>
On Wed, Sep 05, 2018 at 06:55:15AM -0400, Jeff Layton wrote:
> There is no requirement for a filesystem to flush data on close().
And you can't start doing things like that. In some weird cases, you
might have an application open-write-close files at a much higher rate
than what a harddisk can handle. And this has worked for years because
the kernel caches stuff from inodes and data-blocks. If you suddenly
write stuff to harddisk at 10ms for each seek between inode area and
data-area... You end up limited to about 50 of these open-write-close
cycles per second.
My home system is now able make/write/close about 100000 files per
second.
assurancetourix:~/testfiles> time ../a.out 100000 000
0.103u 0.999s 0:01.10 99.0% 0+0k 0+800000io 0pf+0w
(The test program was accessing arguments beyond the end-of-arguments,
An extra argument for this one time program was easier than
open/fix/recompile).
Roger.
--
** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2600998 **
** Delftechpark 26 2628 XH Delft, The Netherlands. KVK: 27239233 **
*-- BitWizard writes Linux device drivers for any device you may have! --*
The plan was simple, like my brother-in-law Phil. But unlike
Phil, this plan just might work.
next prev parent reply other threads:[~2018-09-05 16:37 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-04 6:32 POSIX violation by writeback error 焦晓冬
2018-09-04 7:53 ` Rogier Wolff
2018-09-04 8:58 ` 焦晓冬
2018-09-04 9:29 ` Rogier Wolff
2018-09-04 10:45 ` 焦晓冬
2018-09-04 11:09 ` Jeff Layton
2018-09-04 14:56 ` 焦晓冬
2018-09-04 15:44 ` Jeff Layton
2018-09-04 16:12 ` J. Bruce Fields
2018-09-04 16:23 ` Rogier Wolff
2018-09-04 18:54 ` J. Bruce Fields
2018-09-04 20:18 ` Jeff Layton
2018-09-04 20:35 ` Vito Caputo
2018-09-04 21:02 ` Matthew Wilcox
2018-09-05 0:51 ` Dave Chinner
2018-09-05 8:24 ` 焦晓冬
2018-09-05 10:55 ` Jeff Layton
2018-09-05 12:07 ` Rogier Wolff [this message]
2018-09-06 2:57 ` Dave Chinner
2018-09-06 9:17 ` Rogier Wolff
2018-09-24 23:09 ` Alan Cox
2018-09-05 13:53 ` J. Bruce Fields
2018-09-05 7:08 ` Rogier Wolff
2018-09-05 7:39 ` Martin Steigerwald
2018-09-05 8:04 ` Rogier Wolff
2018-09-05 8:37 ` 焦晓冬
2018-09-05 12:07 ` Austin S. Hemmelgarn
2018-09-05 12:46 ` Rogier Wolff
2018-09-05 9:32 ` Martin Steigerwald
2018-09-05 7:37 ` Martin Steigerwald
2018-09-05 11:42 ` Jeff Layton
2018-09-05 8:09 ` 焦晓冬
2018-09-05 13:08 ` Theodore Y. Ts'o
2018-09-24 23:21 ` Alan Cox
2018-09-06 7:28 ` 焦晓冬
[not found] <CAJDTihx2yaR-_-9Ks1PoFcrKNZgUOoLdN-wRTTMV76Jg_dCLrw@mail.gmail.com>
2018-09-04 10:56 ` Jeff Layton
2018-09-24 23:30 ` Alan Cox
2018-09-25 11:15 ` Jeff Layton
2018-09-25 15:46 ` Theodore Y. Ts'o
2018-09-25 16:17 ` Rogier Wolff
2018-09-25 16:39 ` Alan Cox
2018-09-25 16:41 ` Jeff Layton
2018-09-25 22:30 ` Theodore Y. Ts'o
2018-09-26 18:10 ` Alan Cox
2018-09-26 21:49 ` Theodore Y. Ts'o
2018-09-27 22:48 ` Alan Cox
2018-09-27 7:18 ` Rogier Wolff
2018-09-27 12:43 ` Jeff Layton
2018-09-27 14:27 ` Theodore Y. Ts'o
2018-09-25 17:35 ` Adam Borowski
2018-09-25 22:46 ` Theodore Y. Ts'o
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