bonnie++ before

root@vps166893:~# bonnie++ -u postgres -d /tmp/ -s 4096M -r 1096
Using uid:106, gid:114.
Writing a byte at a time...done
Writing intelligently...done
Rewriting...done
Reading a byte at a time...done
Reading intelligently...done
start 'em...done...done...done...done...done...
Create files in sequential order...done.
Stat files in sequential order...done.
Delete files in sequential order...done.
Create files in random order...done.
Stat files in random order...done.
Delete files in random order...done.
Version  1.97       ------Sequential Output------ --Sequential Input- --Random-
Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
vps166893.ovh.ne 4G   411  97 87991  16 93065  17  1927  98 2112320 100  3455  83
Latency             91675us     895ms     940ms    5558us    2673us    4249us
Version  1.97       ------Sequential Create------ --------Random Create--------
vps166893.ovh.net   -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                 16 22549  45 +++++ +++ +++++ +++ 18555  37 +++++ +++ 21344  35
Latency             15948us     450us     617us    2748us     329us     844us
1.97,1.97,vps166893.ovh.net,1,1478187037,4G,,411,97,87991,16,93065,17,1927,98,2112320,100,3455,83,16,,,,,22549,45,+++++,+++,+++++,+++,18555,37,+++++,+++,21344,35,91675us,895ms,940ms,5558us,2673us,4249us,15948us,450us,617us,2748us,329us,844us