Just for kicks, here are the data from the tests. (these were run on a
rather modest old machine)
Here are the raw dbench data:
#clients vzhost simfs CT ploop CT
---------------------------------------------------------------------
1 11.1297MB/sec 9.96657MB/sec 19.7214MB/sec
2 12.2936MB/sec 14.3138MB/sec 23.5628MB/sec
4 17.8909MB/sec 16.0859MB/sec 45.1936MB/sec
8 25.8332MB/sec 22.9195MB/sec 84.2607MB/sec
16 32.1436MB/sec 28.921MB/sec 155.207MB/sec
32 35.5809MB/sec 32.1429MB/sec 206.571MB/sec
64 34.3609MB/sec 29.9307MB/sec 221.119MB/sec
Here is the script used to invoke dbench:
HOST=`uname -n`
WD=/tmp
FILE=/usr/share/dbench/client.txt
for i in 1 2 4 8 16 32 64
do
dbench -D $WD -c $FILE $i &>dbench-${HOST}-${i}
done
Here are the dd commands and outputs:
OPENVZ HOST
----------------
[root@vzhost ~]# dd bs=1M count=512 if=/dev/zero of=test conv=fdatasync
512+0 records in
512+0 records out
536870912 bytes (537 MB) copied, 11.813 s, 45.4 MB/s
[root@vzhost ~]# df -T
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sda2 ext4 20642428 2390620 17203232 13% /
tmpfs tmpfs 952008 0 952008 0% /dev/shm
/dev/sda1 ext2 482922 68436 389552 15% /boot
/dev/sda4 ext4 51633780 3631524 45379332 8% /local
[root@vzhost ~]#
PLOOP CT
----------------
root@vz101:~# dd bs=1M count=512 if=/dev/zero of=test conv=fdatasync
512+0 records in
512+0 records out
536870912 bytes (537 MB) copied, 2.50071 s, 215 MB/s
root@vz101:~# df -T
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/ploop11054p1 ext4 4539600 1529316 2804928 36% /
none devtmpfs 262144 4 262140 1% /dev
none tmpfs 52432 52 52380 1% /run
none tmpfs 5120 0 5120 0% /run/lock
none tmpfs 262144 0 262144 0% /run/shm
root@vz101:~#
SIMFS CT
----------------
root@vz102:~# dd bs=1M count=512 if=/dev/zero of=test conv=fdatasync
512+0 records in
512+0 records out
536870912 bytes (537 MB) copied, 12.6913 s, 42.3 MB/s
root@vz102:~# df -T
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/simfs simfs 4194304 1365500 2828804 33% /
none devtmpfs 262144 4 262140 1% /dev
none tmpfs 52432 52 52380 1% /run
none tmpfs 5120 0 5120 0% /run/lock
none tmpfs 262144 0 262144 0% /run/shm
root@vz102:~#
Regards,
J J
On Fri, May 2, 2014 at 2:10 PM, jjs - mainphrame <j...@mainphrame.com> wrote:
> You know the saying, "when something seems too good to be true"...
>
> I just installed centos 6.5 and openvz on an older machine, and when I
> built an ubuntu 12.04 CT I noticed that ploop is now the default layout.
> Cool. So I built another ubuntu12.04 CT, identical in every way except that
> I specified smifs, so I could do a quick performance comparison.
>
> First I did a quick timed dd run, then I ran dbench with varying numbers
> of clients.
>
> The simfs CT showed performance roughly similar to the host, which was not
> too surprising.
> What did surprise me was that the ploop CT showed performance which was
> significantly better than the host, in both the dd test and the dbench
> tests.
>
> I know someone will tell me "dbench is a terrible benchmark" but it's also
> a standard. Of course, if anyone knows a "better" benchmark, I'd love to
> try it.
>
> Regards,
>
> J J
>
_______________________________________________
Users mailing list
Users@openvz.org
https://lists.openvz.org/mailman/listinfo/users
