[Users] Curious about ploop performance results.

[jjs - mainphrame]

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 at 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 at 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 at vzhost ~]#


PLOOP CT
----------------
root at 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 at 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 at vz101:~#


SIMFS CT
----------------
root at 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 at 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 at vz102:~#

Regards,

J J

​


On Fri, May 2, 2014 at 2:10 PM, jjs - mainphrame <jjs at 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
>
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