From: Fyodor Ustinov <ufm@ufm.su>
To: ceph-devel@vger.kernel.org
Subject: read vs write. Some tests.
Date: Wed, 01 Jun 2011 17:58:14 +0300 [thread overview]
Message-ID: <4DE65386.90209@ufm.su> (raw)
ceph - 0.28.2 from repository
client - linux 2.6.39/64
All osd servers have 4G RAM. Journal on 1G tempfs. 2*1G ethernet
(etherchannel)
client server have 2G RAM. 2*1G ethernet (etherchannel)
In tests used "dd if=/dev/zero of=file bs=8M count=3000" for write and
"dd if=file of=/dev/null bs=8M count=3000" for read. For rbd instead
"file" used "/dev/rbd0".
In "ceph fs" additionaly used "iozone -a -y 8M -i 0 -i 1 -i 2 -n25g -g25g"
Tests results:
kernel ceph fs:
dd write: 149.748 s, 168 MB/s
dd read: 451.835 s, 55.7 MB/s
iozone write: 165 MB/s
iozone rewrite: 165 MB/s
iozone randow write: 165 MB/s
iozone read: 53 MB/s
iozone reread: 55 MB/s
iozone random read: 41 MB/s
rbd:
dd wite: 212.583 s, 118 MB/s
dd read: 480.374 s, 52.4 MB/s
Frankly I do not quite understand what was happening.
WBR,
Fyodor.
reply other threads:[~2011-06-01 14:58 UTC|newest]
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