fio: (g=0): rw=randrw, bs=4K-256K/4K-256K, ioengine=posixaio, iodepth=8
...
fio: (g=0): rw=randrw, bs=4K-256K/4K-256K, ioengine=posixaio, iodepth=8
Starting 3 threads

fio: (groupid=0): err= 0: pid=9123
  read : io=0KiB, bw=0KiB/s, runt=    39msec
  write: io=200KiB, bw=6,606KiB/s, runt=    31msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=   20, max=   20, avg=20.00, stdev=-1.00
    bw (KiB/s) : min=    0, max=    0, per=0.00%, avg= 0.00, stdev=-1.00
  cpu          : usr=41.03%, sys=0.00%, ctx=5
  IO depths    : 1=16.7%, 2=33.3%, 4=33.3%, 8=16.7%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=8.3%, 64=0.0%, 128=0.0%
     lat (msec): 256=0.0%, 512=0.0%, 1024=0.0%, >=2048=0.0%
fio: (groupid=0): err= 0: pid=9124
  read : io=152KiB, bw=3,990KiB/s, runt=    39msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=   22, max=   22, avg=22.00, stdev=-1.00
  cpu          : usr=41.03%, sys=0.00%, ctx=5
  IO depths    : 1=18.2%, 2=27.3%, 4=36.4%, 8=18.2%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=9.1%, 64=0.0%, 128=0.0%
     lat (msec): 256=0.0%, 512=0.0%, 1024=0.0%, >=2048=0.0%
fio: (groupid=0): err= 0: pid=9125
  read : io=0KiB, bw=0KiB/s, runt=    51msec
  write: io=380KiB, bw=9,049KiB/s, runt=    43msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=   26, max=   33, avg=29.50, stdev= 4.95
    bw (KiB/s) : min=    0, max=    0, per=0.00%, avg= 0.00, stdev=-1.00
  cpu          : usr=15.38%, sys=0.00%, ctx=10
  IO depths    : 1=21.4%, 2=28.6%, 4=28.6%, 8=21.4%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=7.1%, 64=7.1%, 128=0.0%
     lat (msec): 256=0.0%, 512=0.0%, 1024=0.0%, >=2048=0.0%

Run status group 0 (all jobs):
   READ: io=152KiB, aggrb=3,051KiB/s, minb=0KiB/s, maxb=3,990KiB/s, mint=39msec, maxt=51msec
  WRITE: io=580KiB, aggrb=13,812KiB/s, minb=0KiB/s, maxb=9,049KiB/s, mint=39msec, maxt=51msec

Disk stats (read/write):
  sda: ios=2/8, merge=0/18, ticks=40/76, in_queue=116, util=14.62%
0.08user 0.02system 0:00.45elapsed 22%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+2288minor)pagefaults 0swaps