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] [12.0% done] [ 15836/  5304 kb/s] [eta 00m:22s]
Threads: 3: [mmm] [16.0% done] [ 18692/     0 kb/s] [eta 00m:21s]
Threads: 3: [mmm] [20.0% done] [ 15968/  2380 kb/s] [eta 00m:20s]
Threads: 3: [mmm] [24.0% done] [  6864/ 10968 kb/s] [eta 00m:19s]
Threads: 3: [mmm] [26.9% done] [ 10048/  7612 kb/s] [eta 00m:19s]
Threads: 3: [mmm] [30.8% done] [ 11096/  5300 kb/s] [eta 00m:18s]
Threads: 3: [mmm] [34.6% done] [ 12388/  3624 kb/s] [eta 00m:17s]
Threads: 3: [mmm] [37.0% done] [ 11084/  3968 kb/s] [eta 00m:17s]
Threads: 3: [mmm] [40.7% done] [ 13000/     0 kb/s] [eta 00m:16s]
Threads: 3: [mmm] [44.4% done] [  6392/  7964 kb/s] [eta 00m:15s]
Threads: 3: [mmm] [46.4% done] [ 10752/  1296 kb/s] [eta 00m:15s]
Threads: 3: [mmm] [50.0% done] [  7804/  4416 kb/s] [eta 00m:14s]
Threads: 3: [mmm] [53.6% done] [  6064/  5732 kb/s] [eta 00m:13s]
Threads: 3: [mmm] [55.2% done] [  8976/   728 kb/s] [eta 00m:13s]
Threads: 3: [mmm] [56.7% done] [  4872/  5996 kb/s] [eta 00m:13s]
Threads: 3: [mmm] [60.0% done] [  2536/  7464 kb/s] [eta 00m:12s]
Threads: 3: [mmm] [63.3% done] [  6604/  1664 kb/s] [eta 00m:11s]
Threads: 3: [mmm] [64.5% done] [  2612/  6344 kb/s] [eta 00m:11s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=23782, got signal=6
Threads: 2: [m_m] [65.6% done] [  2548/  5596 kb/s] [eta 00m:11s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=23781, got signal=6
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=23783, got signal=6

fio: (groupid=0): err= 0: pid=23781
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.7%, 2=3.1%, 4=33.3%, 8=62.9%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.5%, 4=0.1%, 10=2.6%, 20=4.9%, 50=16.4%, 100=26.2%
     lat (msec): 250=46.4%, 500=2.0%, 750=0.4%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=23782
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.5%, 2=2.8%, 4=29.2%, 8=67.4%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.4%, 4=0.2%, 10=1.6%, 20=3.2%, 50=12.8%, 100=33.8%
     lat (msec): 250=47.1%, 500=0.7%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=23783
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.2%, 2=1.4%, 4=27.4%, 8=70.9%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.4%, 4=0.1%, 10=0.9%, 20=3.3%, 50=10.7%, 100=31.8%
     lat (msec): 250=50.2%, 500=2.2%, 750=0.0%, 1000=0.0%, >=2000=0.0%

Run status group 0 (all jobs):

Disk stats (read/write):
  sda: ios=3131/2145, merge=552/98, ticks=46912/28528, in_queue=75440, util=98.66%
0.21user 0.43system 0:22.48elapsed 2%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+2478minor)pagefaults 0swaps