From: Christoph Hellwig <hch@infradead.org>
To: Zheng Da <zhengda1936@gmail.com>
Cc: xfs@oss.sgi.com
Subject: Re: concurrent direct IO write in xfs
Date: Mon, 16 Jan 2012 12:48:19 -0500 [thread overview]
Message-ID: <20120116174819.GA19417@infradead.org> (raw)
In-Reply-To: <CAFLer83FBZG9ZCrT2jUZBcTC2a2tx_CDmykyPF4cTP0dbHGw7Q@mail.gmail.com>
On Sun, Jan 15, 2012 at 07:01:42PM -0500, Zheng Da wrote:
> Hello,
>
> I surprisedly found that writing data to a file (no appending) with direct
> IO and with multiple threads has the same performance as a single thread.
> Actually, it seems there is only one core is working at a time. In my case,
> each time I write a page to a file and the offset is always aligned to the
> page size, so there is no overlapping between writes.
What kernel version are you using? Also, what is the exact I/O
pattern?
_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs
next prev parent reply other threads:[~2012-01-16 17:48 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-16 0:01 concurrent direct IO write in xfs Zheng Da
2012-01-16 17:48 ` Christoph Hellwig [this message]
2012-01-16 19:44 ` Zheng Da
2012-01-16 23:25 ` Dave Chinner
2012-01-17 19:19 ` Zheng Da
2012-01-20 8:53 ` Linda Walsh
2012-01-20 15:07 ` Zheng Da
2012-01-23 5:11 ` Dave Chinner
2012-01-23 19:34 ` Zheng Da
2012-01-23 20:51 ` Zheng Da
2012-01-24 0:34 ` Stan Hoeppner
2012-01-24 1:40 ` Zheng Da
2012-01-24 3:54 ` Dave Chinner
2012-01-25 21:20 ` Zheng Da
2012-01-25 22:25 ` Dave Chinner
2012-02-09 6:09 ` Dave Chinner
2012-02-09 6:44 ` Zheng Da
2012-02-13 17:48 ` Christoph Hellwig
2012-02-13 23:07 ` Dave Chinner
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=20120116174819.GA19417@infradead.org \
--to=hch@infradead.org \
--cc=xfs@oss.sgi.com \
--cc=zhengda1936@gmail.com \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.