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=9111
  read : io=64KiB, bw=1,638KiB/s, runt=    40msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=   15, max=   15, avg=15.00, stdev=-1.00
  cpu          : usr=10.00%, sys=0.00%, ctx=9
  IO depths    : 1=25.0%, 2=25.0%, 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=8.3%, 32=0.0%, 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=9112
  read : io=1,048KiB, bw=1,690KiB/s, runt=   635msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=    2, max=   62, avg=38.71, stdev=19.04
    bw (KiB/s) : min=   16, max=   16, per=0.89%, avg=16.00, stdev=-1.00
  write: io=61,032KiB, bw=99MiB/s, runt=   615msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=    0, max=   17, avg= 0.61, stdev= 1.75
    bw (KiB/s) : min=    0, max=    0, per=0.00%, avg= 0.00, stdev=-1.00
  cpu          : usr=74.21%, sys=15.09%, ctx=616
  IO depths    : 1=0.7%, 2=93.9%, 4=3.0%, 8=2.4%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=92.9%, 4=0.3%, 8=0.0%, 16=2.4%, 32=0.4%, 64=1.5%, 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=1,112KiB, aggrb=1,793KiB/s, minb=0KiB/s, maxb=1,690KiB/s, mint=23msec, maxt=635msec
  WRITE: io=61,032KiB, aggrb=99MiB/s, minb=0KiB/s, maxb=99MiB/s, mint=23msec, maxt=635msec

Disk stats (read/write):
  sda: ios=22/545, merge=0/14743, ticks=128/219400, in_queue=219528, util=79.45%
0.54user 0.14system 0:02.79elapsed 24%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+2308minor)pagefaults 0swaps