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] [5.0% done] [  3880/   243 kb/s] [eta 00m:57s]
Threads: 3: [mmm] [6.7% done] [ 12437/  2392 kb/s] [eta 00m:56s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=5558, got signal=6
Threads: 2: [_mm] [8.3% done] [ 14574/  1028 kb/s] [eta 00m:55s]
Threads: 2: [_mm] [13.3% done] [  8204/  9848 kb/s] [eta 00m:39s]
Threads: 2: [_mm] [18.4% done] [  6519/  9646 kb/s] [eta 00m:31s]
Threads: 2: [_mm] [22.2% done] [  8066/  6420 kb/s] [eta 00m:28s]
Threads: 2: [_mm] [26.5% done] [  9858/  2723 kb/s] [eta 00m:25s]
Threads: 2: [_mm] [32.3% done] [  3579/  9902 kb/s] [eta 00m:21s]
Threads: 2: [_mm] [36.7% done] [  1531/ 12726 kb/s] [eta 00m:19s]
Threads: 2: [_mm] [40.0% done] [  6668/  5623 kb/s] [eta 00m:18s]
Threads: 2: [_mm] [44.8% done] [  4837/  6838 kb/s] [eta 00m:16s]
Threads: 2: [_mm] [48.3% done] [  6493/  2482 kb/s] [eta 00m:15s]
Threads: 2: [_mm] [50.0% done] [  8846/     0 kb/s] [eta 00m:15s]
Threads: 2: [_mm] [53.3% done] [  7712/  1686 kb/s] [eta 00m:14s]
Threads: 2: [_mm] [54.8% done] [  4985/  3421 kb/s] [eta 00m:14s]
Threads: 2: [_mm] [58.1% done] [  7184/   467 kb/s] [eta 00m:13s]
Threads: 2: [_mm] [57.6% done] [  4860/  2058 kb/s] [eta 00m:14s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=5560, got signal=6
Threads: 1: [_m_] [62.5% done] [  1507/  7513 kb/s] [eta 00m:12s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
Threads: 1: [_m_] [67.7% done] [  4083/  2775 kb/s] [eta 00m:10s]
fio: pid=5559, got signal=6

fio: (groupid=0): err= 0: pid=5558
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=3.4%, 2=3.4%, 4=6.9%, 8=86.2%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.0%, 4=0.0%, 10=0.0%, 20=0.0%, 50=0.0%, 100=0.0%
     lat (msec): 250=48.3%, 500=20.7%, 750=1.7%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=5559
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.7%, 2=2.7%, 4=31.0%, 8=65.6%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.8%, 4=0.2%, 10=2.1%, 20=5.8%, 50=26.6%, 100=28.0%
     lat (msec): 250=32.5%, 500=2.4%, 750=0.6%, 1000=0.1%, >=2000=0.1%
fio: (groupid=0): err= 0: pid=5560
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.4%, 2=2.4%, 4=27.1%, 8=70.1%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.4%, 4=0.4%, 10=0.3%, 20=3.5%, 50=26.0%, 100=41.0%
     lat (msec): 250=26.5%, 500=0.9%, 750=0.0%, 1000=0.1%, >=2000=0.1%

Run status group 0 (all jobs):

Disk stats (read/write):
  sda: ios=2260/2618, merge=477/8041, ticks=36748/420616, in_queue=432752, util=99.24%
0.15user 0.27system 0:21.65elapsed 1%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+2458minor)pagefaults 0swaps