From: Fyodor Ustinov <ufm@ufm.su>
To: ceph-devel@vger.kernel.org
Subject: Re: read and write speed.
Date: Tue, 31 May 2011 13:01:26 +0300 [thread overview]
Message-ID: <4DE4BC76.1080906@ufm.su> (raw)
In-Reply-To: <4DE41F34.8020504@ufm.su>
On 05/31/2011 01:50 AM, Fyodor Ustinov wrote:
> Hi!
>
> Fresh 0.28.2 cluster.
>
> Why reading two times slower than the writing by dd, but rados show
> different.
> (Second question - why rados bench crash on read test?)
>
>
> root@gate0:/mnt# dd if=/dev/zero of=aaa bs=1024000 count=10000
> 10000+0 records in
> 10000+0 records out
> 10240000000 bytes (10 GB) copied, 64.5598 s, 159 MB/s
>
> root@gate0:/mnt# dd if=aaa of=/dev/null bs=1024000
> 10000+0 records in
> 10000+0 records out
> 10240000000 bytes (10 GB) copied, 122.513 s, 83.6 MB/s
> root@gate0:/mnt#
Additional. fuse vs kernel mount
fuse:
root@gate0:/mnt# dd if=/dev/zero of=bbb bs=1024000 count=10000
conv=fdatasync
10000+0 records in
10000+0 records out
10240000000 bytes (10 GB) copied, 75.7654 s, 135 MB/s
root@gate0:/mnt# dd if=bbb of=/dev/null bs=1024000
10000+0 records in
10000+0 records out
10240000000 bytes (10 GB) copied, 101.613 s, 101 MB/s
kernel:
root@gate0:/mnt# rm bbb
root@gate0:/mnt# dd if=/dev/zero of=bbb bs=1024000 count=10000
conv=fdatasync
10000+0 records in
10000+0 records out
10240000000 bytes (10 GB) copied, 73.143 s, 140 MB/s
root@gate0:/mnt# dd if=bbb of=/dev/null bs=1024000
10000+0 records in
10000+0 records out
10240000000 bytes (10 GB) copied, 150.84 s, 67.9 MB/s
root@gate0:/mnt#
What? Ok. reboot. After reboot:
root@gate0:/mnt# rm bbb
root@gate0:/mnt# dd if=/dev/zero of=bbb bs=1024000 count=10000
conv=fdatasync
10000+0 records in
10000+0 records out
10240000000 bytes (10 GB) copied, 68.9618 s, 148 MB/s
root@gate0:/mnt# dd if=bbb of=/dev/null bs=1024000
10000+0 records in
10000+0 records out
10240000000 bytes (10 GB) copied, 165.564 s, 61.8 MB/s
root@gate0:/mnt#
Hmm... unmount kernel and mount fuse...
root@gate0:/mnt# cd
root@gate0:~# umount /mnt
root@gate0:~# cfuse -m 10.5.51.230:/ /mnt
** WARNING: Ceph is still under development. Any feedback can be
directed **
** at ceph-devel@vger.kernel.org or
http://ceph.newdream.net/. **
cfuse[1102]: starting ceph client
cfuse[1102]: starting fuse
root@gate0:~# cd /mnt/
root@gate0:/mnt# dd if=bbb of=/dev/null bs=1024000
10000+0 records in
10000+0 records out
10240000000 bytes (10 GB) copied, 93.076 s, 110 MB/s
root@gate0:/mnt#
What the hell?
WBR,
Fyodor.
next prev parent reply other threads:[~2011-05-31 10:01 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-30 22:50 read and write speed Fyodor Ustinov
2011-05-31 2:26 ` djlee064
2011-05-31 2:48 ` Henry C Chang
2011-05-31 3:20 ` djlee064
2011-05-31 7:06 ` Henry C Chang
2011-05-31 7:29 ` djlee064
2011-05-31 10:01 ` Fyodor Ustinov [this message]
2011-05-31 14:51 ` Gregory Farnum
2011-05-31 15:05 ` Fyodor Ustinov
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