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: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=23051, got signal=6
Threads: 2
Threads: 2
Threads: 2: [_mF] [37.5% done] [  1472/     0 kb/s] [eta 00m:05s]
Threads: 2: [_mF] [40.0% done] [  1276/   656 kb/s] [eta 00m:06s]
Threads: 2: [_mF] [41.7% done] [  1732/     0 kb/s] [eta 00m:07s]
Threads: 2: [_mF] [42.9% done] [   880/     0 kb/s] [eta 00m:08s]
Threads: 2: [_mF] [53.8% done] [   440/ 16028 kb/s] [eta 00m:06s]
Threads: 2: [_FF] [100.0% done] [     0/ 23831 kb/s] [eta 00m:00s]
Threads: 2: [_FF] [100.0% done] [     0/     0 kb/s] [eta 00m:00s]
Threads: 2: [_FF] [100.0% done] [     0/     0 kb/s] [eta 00m:00s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=23053, got signal=6
Threads: 1: [_F_] [100.0% done] [     0/     0 kb/s] [eta 00m:00s]
Threads: 1: [_F_] [100.0% done] [     0/     0 kb/s] [eta 00m:00s]
Threads: 1: [_F_] [100.0% done] [     0/     0 kb/s] [eta 00m:00s]
Threads: 1: [_F_] [100.0% done] [     0/     0 kb/s] [eta 00m:00s]
Threads: 1: [_V_] [83.3% done] [ 24568/     0 kb/s] [eta 00m:03s]
Threads: 1: [_V_] [100.0% done] [ 31512/     0 kb/s] [eta 00m:00s]
fio: (groupid=0): err= 0: pid=23051
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.2%, 2=96.0%, 4=3.7%, 8=0.1%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=97.7%, 4=1.1%, 10=1.0%, 20=0.0%, 50=0.0%, 100=0.0%
     lat (msec): 250=0.0%, 500=0.0%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=23052
  read : io=100MiB, bw=6,000KiB/s, runt= 17474msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=    0, max=  839, avg=40.87, stdev=102.09
    bw (KiB/s) : min=    2, max=32399, per=150.75%, avg=9529.11, stdev=12520.89
  write: io=84,908KiB, bw=5,989KiB/s, runt= 14516msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=    0, max=  695, avg= 4.03, stdev=40.14
    bw (KiB/s) : min=    0, max=23774, per=39.85%, avg=7989.00, stdev=13670.55
  cpu          : usr=3.89%, sys=2.61%, ctx=4435
  IO depths    : 1=1.4%, 2=52.1%, 4=31.5%, 8=15.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=47.1%, 4=0.4%, 10=20.4%, 20=18.4%, 50=6.6%, 100=1.7%
     lat (msec): 250=2.9%, 500=1.3%, 750=1.1%, 1000=0.1%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=23053
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.3%, 2=93.1%, 4=3.3%, 8=3.4%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=93.5%, 4=1.3%, 10=0.5%, 20=0.2%, 50=0.3%, 100=0.5%
     lat (msec): 250=3.3%, 500=0.0%, 750=0.0%, 1000=0.0%, >=2000=0.0%

Run status group 0 (all jobs):
   READ: io=105MiB, aggrb=6,321KiB/s, minb=0KiB/s, maxb=6,000KiB/s, mint=0msec, maxt=17474msec
  WRITE: io=278MiB, aggrb=20,049KiB/s, minb=0KiB/s, maxb=5,989KiB/s, mint=0msec, maxt=17474msec

Disk stats (read/write):
  sda: ios=1407/2296, merge=521/68583, ticks=24320/1825552, in_queue=1850616, util=97.84%
2.28user 1.13system 0:17.84elapsed 19%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+2485minor)pagefaults 0swaps