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=3943
  read : io=88KiB, bw=2,095KiB/s, runt=    43msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=   19, max=   19, avg=19.00, stdev=-1.00
  cpu          : usr=18.18%, sys=0.00%, ctx=8
  IO depths    : 1=27.3%, 2=18.2%, 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%

Run status group 0 (all jobs):
   READ: io=88KiB, aggrb=2,095KiB/s, minb=0KiB/s, maxb=2,095KiB/s, mint=27msec, maxt=43msec

Disk stats (read/write):
  sda: ios=4/3, merge=0/17, ticks=72/0, in_queue=72, util=12.08%
0.08user 0.09system 0:00.49elapsed 37%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+2286minor)pagefaults 0swaps