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=3928
  read : io=76KiB, bw=138KiB/s, runt=   563msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=   14, max=   14, avg=14.00, stdev=-1.00
    bw (KiB/s) : min=  151, max=  151, per=86.78%, avg=151.00, stdev=-1.00
  write: io=58,308KiB, bw=109MiB/s, runt=   535msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=    0, max=    5, avg= 0.53, stdev= 0.79
    bw (KiB/s) : min=    0, max=    0, per=0.00%, avg= 0.00, stdev=-1.00
  cpu          : usr=88.10%, sys=27.71%, ctx=491
  IO depths    : 1=0.3%, 2=95.2%, 4=4.0%, 8=0.5%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=90.2%, 4=5.8%, 8=1.2%, 16=0.2%, 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=3930
  read : io=20KiB, bw=37KiB/s, runt=   540msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=   15, max=   15, avg=15.00, stdev=-1.00
    bw (KiB/s) : min=   39, max=   39, per=22.41%, avg=39.00, stdev=-1.00
  write: io=50,428KiB, bw=97,799KiB/s, runt=   528msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=    0, max=    4, avg= 0.74, stdev= 0.82
    bw (KiB/s) : min=    0, max=    0, per=0.00%, avg= 0.00, stdev=-1.00
  cpu          : usr=91.85%, sys=15.56%, ctx=532
  IO depths    : 1=1.6%, 2=93.8%, 4=4.0%, 8=0.6%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=83.3%, 4=12.3%, 8=0.8%, 16=0.2%, 32=0.0%, 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=96KiB, aggrb=174KiB/s, minb=0KiB/s, maxb=138KiB/s, mint=15msec, maxt=563msec
  WRITE: io=106MiB, aggrb=203MiB/s, minb=0KiB/s, maxb=109MiB/s, mint=15msec, maxt=563msec

Disk stats (read/write):
  sda: ios=4/1337, merge=0/25818, ticks=92/857748, in_queue=858004, util=90.34%
1.05user 0.28system 0:07.31elapsed 18%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+2334minor)pagefaults 0swaps