From: William Josephson <jkw@eecs.harvard.edu>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] 8 cores
Date: Thu, 17 Jul 2008 08:56:53 -0400 [thread overview]
Message-ID: <20080717125653.GA13591@mero.morphisms.net> (raw)
In-Reply-To: <fcdbb29608c689b6f83ca3a2b5539692@quanstro.net>
On Thu, Jul 17, 2008 at 08:41:21AM -0400, erik quanstrom wrote:
> as you've pointed out, performance-wise it's not copying vs. nothing
> it's copying vs page faults and trips through the vm code.
> i would think playing vm games (as linus likes to say) would make
> scheduling on mp harder
Munmap is what is really expensive. The aio stuff exists
under Unix for Oracle and DB2, which is why it only works
for ordinary files in direct I/O mode under Linux.
-WJ
next prev parent reply other threads:[~2008-07-17 12:56 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-17 12:41 erik quanstrom
2008-07-17 12:56 ` William Josephson [this message]
2008-07-17 12:58 ` ron minnich
2008-07-17 13:46 ` erik quanstrom
2008-07-17 14:06 ` ron minnich
-- strict thread matches above, loose matches on Subject: below --
2008-07-15 22:28 erik quanstrom
2008-07-15 22:27 ` Benjamin Huntsman
2008-07-15 22:35 ` Williams, Mitch
2008-07-16 1:39 ` erik quanstrom
2008-07-16 5:12 ` Benjamin Huntsman
2008-07-16 7:00 ` sqweek
2008-07-16 12:54 ` Russ Cox
2008-07-16 11:37 ` C H Forsyth
2008-07-16 12:13 ` John Waters
2008-07-16 13:03 ` a
2008-07-16 13:44 ` Uriel
2008-07-16 13:55 ` John Waters
2008-07-16 14:16 ` Robert William Fuller
2008-07-16 13:07 ` erik quanstrom
2008-07-16 13:42 ` Uriel
2008-07-16 15:02 ` Benjamin Huntsman
2008-07-16 18:56 ` Uriel
2008-07-17 7:59 ` Kernel Panic
2008-07-17 9:07 ` Charles Forsyth
2008-07-17 10:04 ` Kernel Panic
2008-07-17 10:14 ` Roman V. Shaposhnik
2008-07-17 12:55 ` ron minnich
2008-07-17 12:58 ` William Josephson
2008-07-17 13:45 ` erik quanstrom
2008-07-17 14:11 ` ron minnich
2008-07-17 14:32 ` Roman V. Shaposhnik
2008-07-17 13:32 ` Paweł Lasek
2008-07-17 14:07 ` Kernel Panic
2008-07-16 22:44 ` Iruata Souza
2008-07-17 8:38 ` Kernel Panic
2008-07-17 18:14 ` Iruata Souza
2008-07-23 11:42 ` matt
2008-07-23 18:32 ` Iruata Souza
2008-07-16 1:41 ` andrey mirtchovski
2008-07-16 20:38 ` Roman V. Shaposhnik
2008-07-17 2:09 ` erik quanstrom
2008-07-17 10:18 ` Roman V. Shaposhnik
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20080717125653.GA13591@mero.morphisms.net \
--to=jkw@eecs.harvard.edu \
--cc=9fans@9fans.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).