From: Al Boldi <a1426z@gawab.com>
To: Justin Piszcz <jpiszcz@lucidpixels.com>
Cc: xfs@oss.sgi.com, linux-raid@vger.kernel.org,
Alan Piszcz <ap@solarrain.com>
Subject: Re: Linux Software RAID 5 + XFS Multi-Benchmarks / 10 Raptors Again
Date: Thu, 17 Jan 2008 00:19:04 +0300 [thread overview]
Message-ID: <200801170019.04836.a1426z@gawab.com> (raw)
In-Reply-To: <alpine.DEB.0.999999.0801161243380.1151@p34.internal.lan>
Justin Piszcz wrote:
> On Wed, 16 Jan 2008, Al Boldi wrote:
> > > Also, can you retest using dd with different block-sizes?
>
> I can do this, moment..
>
>
> I know about oflag=direct but I choose to use dd with sync and measure the
> total time it takes.
> /usr/bin/time -f %E -o ~/$i=chunk.txt bash -c 'dd if=/dev/zero
> of=/r1/bigfile bs=1M count=10240; sync'
>
> So I was asked on the mailing list to test dd with various chunk sizes,
> here is the length of time it took
> to write 10 GiB and sync per each chunk size:
>
> 4=chunk.txt:0:25.46
> 8=chunk.txt:0:25.63
> 16=chunk.txt:0:25.26
> 32=chunk.txt:0:25.08
> 64=chunk.txt:0:25.55
> 128=chunk.txt:0:25.26
> 256=chunk.txt:0:24.72
> 512=chunk.txt:0:24.71
> 1024=chunk.txt:0:25.40
> 2048=chunk.txt:0:25.71
> 4096=chunk.txt:0:27.18
> 8192=chunk.txt:0:29.00
> 16384=chunk.txt:0:31.43
> 32768=chunk.txt:0:50.11
> 65536=chunk.txt:2:20.80
What do you get with bs=512,1k,2k,4k,8k,16k...
Thanks!
--
Al
next prev parent reply other threads:[~2008-01-16 21:19 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-16 16:13 Linux Software RAID 5 + XFS Multi-Benchmarks / 10 Raptors Again Justin Piszcz
2008-01-16 16:55 ` Justin Piszcz
2008-01-16 17:27 ` Al Boldi
2008-01-16 18:02 ` Justin Piszcz
2008-01-16 21:19 ` Al Boldi [this message]
2008-01-16 22:53 ` Justin Piszcz
2008-01-16 22:55 ` Justin Piszcz
2008-01-18 15:24 ` Bill Davidsen
2008-01-18 15:28 ` Justin Piszcz
2008-01-16 18:09 ` Greg Cormier
2008-01-16 18:19 ` Justin Piszcz
2008-02-19 21:48 ` Peter Grandi
2008-01-18 15:35 ` Greg Cormier
2008-01-18 15:39 ` Justin Piszcz
2008-01-18 15:43 ` Greg Cormier
2008-01-18 15:58 ` Justin Piszcz
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=200801170019.04836.a1426z@gawab.com \
--to=a1426z@gawab.com \
--cc=ap@solarrain.com \
--cc=jpiszcz@lucidpixels.com \
--cc=linux-raid@vger.kernel.org \
--cc=xfs@oss.sgi.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.