<div dir="ltr">Just for kicks, here are the data from the tests. (these were run on a rather modest old machine)<div><br></div><div><img src="cid:ii_huq0ummt0_145bef099d4a4d8b" width="563" height="429.9113530326594"></div>
<div><br></div><div><br></div><div>Here are the raw dbench data:</div><div><br></div><div><br></div><div><div><font face="courier new, monospace">#clients vzhost simfs CT ploop CT</font></div>
<div><font face="courier new, monospace">---------------------------------------------------------------------</font></div><div><font face="courier new, monospace">1 11.1297MB/sec 9.96657MB/sec 19.7214MB/sec</font></div>
<div><font face="courier new, monospace">2 12.2936MB/sec 14.3138MB/sec 23.5628MB/sec</font></div><div><font face="courier new, monospace">4 17.8909MB/sec 16.0859MB/sec 45.1936MB/sec</font></div>
<div><font face="courier new, monospace">8 25.8332MB/sec 22.9195MB/sec 84.2607MB/sec</font></div><div><font face="courier new, monospace">16 32.1436MB/sec 28.921MB/sec 155.207MB/sec</font></div>
<div><font face="courier new, monospace">32 35.5809MB/sec 32.1429MB/sec 206.571MB/sec</font></div><div><font face="courier new, monospace">64 34.3609MB/sec 29.9307MB/sec 221.119MB/sec</font></div>
<div><br></div><div>Here is the script used to invoke dbench:</div><div><br></div><div><div><font face="courier new, monospace">HOST=`uname -n`</font></div><div><font face="courier new, monospace">WD=/tmp</font></div><div>
<font face="courier new, monospace">FILE=/usr/share/dbench/client.txt</font></div><div><font face="courier new, monospace"><br></font></div><div><font face="courier new, monospace">for i in 1 2 4 8 16 32 64</font></div><div>
<font face="courier new, monospace">do</font></div><div><font face="courier new, monospace"> dbench -D $WD -c $FILE $i &>dbench-${HOST}-${i}</font></div><div><font face="courier new, monospace">done</font></div>
</div><div><br></div><div>Here are the dd commands and outputs:</div><div><br></div><div><div><font face="courier new, monospace">OPENVZ HOST</font></div><div><font face="courier new, monospace">----------------</font></div>
<div><font face="courier new, monospace">[root@vzhost ~]# dd bs=1M count=512 if=/dev/zero of=test conv=fdatasync</font></div><div><font face="courier new, monospace">512+0 records in</font></div><div><font face="courier new, monospace">512+0 records out</font></div>
<div><font face="courier new, monospace">536870912 bytes (537 MB) copied, 11.813 s, 45.4 MB/s</font></div><div><font face="courier new, monospace">[root@vzhost ~]# df -T</font></div><div><font face="courier new, monospace">Filesystem Type 1K-blocks Used Available Use% Mounted on</font></div>
<div><font face="courier new, monospace">/dev/sda2 ext4 20642428 2390620 17203232 13% /</font></div><div><font face="courier new, monospace">tmpfs tmpfs 952008 0 952008 0% /dev/shm</font></div>
<div><font face="courier new, monospace">/dev/sda1 ext2 482922 68436 389552 15% /boot</font></div><div><font face="courier new, monospace">/dev/sda4 ext4 51633780 3631524 45379332 8% /local</font></div>
<div><font face="courier new, monospace">[root@vzhost ~]# </font></div><div><font face="courier new, monospace"><br></font></div><div><font face="courier new, monospace"><br></font></div><div><font face="courier new, monospace">PLOOP CT</font></div>
<div><font face="courier new, monospace">----------------</font></div><div><font face="courier new, monospace">root@vz101:~# dd bs=1M count=512 if=/dev/zero of=test conv=fdatasync</font></div><div><font face="courier new, monospace">512+0 records in</font></div>
<div><font face="courier new, monospace">512+0 records out</font></div><div><font face="courier new, monospace">536870912 bytes (537 MB) copied, 2.50071 s, 215 MB/s</font></div><div><font face="courier new, monospace"><br>
</font></div><div><font face="courier new, monospace">root@vz101:~# df -T</font></div><div><font face="courier new, monospace">Filesystem Type 1K-blocks Used Available Use% Mounted on</font></div><div><font face="courier new, monospace">/dev/ploop11054p1 ext4 4539600 1529316 2804928 36% /</font></div>
<div><font face="courier new, monospace">none devtmpfs 262144 4 262140 1% /dev</font></div><div><font face="courier new, monospace">none tmpfs 52432 52 52380 1% /run</font></div>
<div><font face="courier new, monospace">none tmpfs 5120 0 5120 0% /run/lock</font></div><div><font face="courier new, monospace">none tmpfs 262144 0 262144 0% /run/shm</font></div>
<div><font face="courier new, monospace">root@vz101:~#</font></div><div><font face="courier new, monospace"><br></font></div><div><font face="courier new, monospace"><br></font></div><div><font face="courier new, monospace">SIMFS CT</font></div>
<div><font face="courier new, monospace">----------------</font></div><div><font face="courier new, monospace">root@vz102:~# dd bs=1M count=512 if=/dev/zero of=test conv=fdatasync</font></div><div><font face="courier new, monospace">512+0 records in</font></div>
<div><font face="courier new, monospace">512+0 records out</font></div><div><font face="courier new, monospace">536870912 bytes (537 MB) copied, 12.6913 s, 42.3 MB/s</font></div><div><font face="courier new, monospace">root@vz102:~# df -T</font></div>
<div><font face="courier new, monospace">Filesystem Type 1K-blocks Used Available Use% Mounted on</font></div><div><font face="courier new, monospace">/dev/simfs simfs 4194304 1365500 2828804 33% /</font></div>
<div><font face="courier new, monospace">none devtmpfs 262144 4 262140 1% /dev</font></div><div><font face="courier new, monospace">none tmpfs 52432 52 52380 1% /run</font></div>
<div><font face="courier new, monospace">none tmpfs 5120 0 5120 0% /run/lock</font></div><div><font face="courier new, monospace">none tmpfs 262144 0 262144 0% /run/shm</font></div>
<div><font face="courier new, monospace">root@vz102:~# </font></div></div><div><font face="courier new, monospace"><br></font></div><div><font face="arial, helvetica, sans-serif">Regards,</font></div><div><font face="arial, helvetica, sans-serif"><br>
</font></div><div><font face="arial, helvetica, sans-serif">J J</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><font face="arial, helvetica, sans-serif"></font><br></div></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On Fri, May 2, 2014 at 2:10 PM, jjs - mainphrame <span dir="ltr"><<a href="mailto:jjs@mainphrame.com" target="_blank">jjs@mainphrame.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">You know the saying, "when something seems too good to be true"...<div><br></div><div>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.</div>
<div><br></div><div>First I did a quick timed dd run, then I ran dbench with varying numbers of clients.</div><div><br></div><div>The simfs CT showed performance roughly similar to the host, which was not too surprising.</div>
<div>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.</div><div><br></div><div>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.</div>
<div><br></div><div>Regards,</div><div><br></div><div>J J</div></div>
</blockquote></div><br></div>