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
Threads: 3
Threads: 3
Threads: 3: [mmm] [13.6% done] [ 13860/  7252 kb/s] [eta 00m:19s]
Threads: 3: [mmm] [19.0% done] [  9016/ 10412 kb/s] [eta 00m:17s]
Threads: 3: [mmm] [22.7% done] [ 16456/  2128 kb/s] [eta 00m:17s]
Threads: 3: [mmm] [26.1% done] [ 13604/  3532 kb/s] [eta 00m:17s]
Threads: 3: [mmm] [29.2% done] [  9368/  8540 kb/s] [eta 00m:17s]
Threads: 3: [mmm] [32.0% done] [ 10336/  7320 kb/s] [eta 00m:17s]
Threads: 3: [mmm] [36.0% done] [ 12440/  3248 kb/s] [eta 00m:16s]
Threads: 3: [mmm] [38.5% done] [ 12932/  2068 kb/s] [eta 00m:16s]
Threads: 3: [mmm] [42.3% done] [  6576/  6576 kb/s] [eta 00m:15s]
Threads: 3: [mmm] [44.4% done] [  9408/  3348 kb/s] [eta 00m:15s]
Threads: 3: [mmm] [48.1% done] [  8368/  4268 kb/s] [eta 00m:14s]
Threads: 3: [mmm] [51.9% done] [  5072/  8836 kb/s] [eta 00m:13s]
Threads: 3: [mmm] [55.6% done] [  3652/  7164 kb/s] [eta 00m:12s]
Threads: 3: [mmm] [57.1% done] [  6088/  3248 kb/s] [eta 00m:12s]
Threads: 3: [mmm] [58.6% done] [  4472/  6860 kb/s] [eta 00m:12s]
Threads: 3: [mmm] [60.0% done] [  5672/  3312 kb/s] [eta 00m:12s]
Threads: 3: [mmm] [61.3% done] [  4220/  5992 kb/s] [eta 00m:12s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=25026, got signal=6
Threads: 2: [m_m] [62.5% done] [  1948/  5864 kb/s] [eta 00m:12s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=25027, got signal=6
Threads: 1: [m__] [67.7% done] [  7568/   436 kb/s] [eta 00m:10s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=25025, got signal=6

fio: (groupid=0): err= 0: pid=25025
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.6%, 2=2.3%, 4=35.5%, 8=61.6%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.6%, 4=0.1%, 10=1.1%, 20=2.8%, 50=22.1%, 100=22.7%
     lat (msec): 250=47.4%, 500=2.9%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=25026
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.8%, 2=3.3%, 4=31.5%, 8=64.4%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=1.4%, 4=0.1%, 10=1.6%, 20=2.8%, 50=13.0%, 100=30.7%
     lat (msec): 250=49.2%, 500=0.6%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=25027
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.2%, 2=2.9%, 4=37.4%, 8=59.5%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.6%, 4=0.4%, 10=1.9%, 20=4.0%, 50=15.6%, 100=28.1%
     lat (msec): 250=46.2%, 500=2.5%, 750=0.1%, 1000=0.0%, >=2000=0.0%

Run status group 0 (all jobs):

Disk stats (read/write):
  sda: ios=2927/2238, merge=559/164, ticks=43080/30728, in_queue=73804, util=98.95%
0.34user 0.35system 0:21.92elapsed 3%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+2483minor)pagefaults 0swaps