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] [23.1% done] [ 19200/ 53646 kb/s] [eta 00m:10s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=29161, got signal=6
Threads: 2: [m_m] [30.8% done] [ 14835/ 39261 kb/s] [eta 00m:09s]
Threads: 2: [m_F] [45.5% done] [  2377/ 18281 kb/s] [eta 00m:06s]
Threads: 2: [m_F] [46.2% done] [  1610/     0 kb/s] [eta 00m:07s]
Threads: 2: [m_F] [53.8% done] [  2178/ 11885 kb/s] [eta 00m:06s]
Threads: 2: [m_F] [57.1% done] [  1090/  2603 kb/s] [eta 00m:06s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=29160, got signal=6
Threads: 1: [__F] [100.0% done] [   613/ 18761 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: [__F] [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=29162, got signal=6

fio: (groupid=0): err= 0: pid=29160
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.2%, 2=63.4%, 4=4.7%, 8=31.7%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=57.8%, 4=6.7%, 10=0.1%, 20=0.0%, 50=7.5%, 100=17.2%
     lat (msec): 250=6.9%, 500=3.6%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=29161
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.2%, 2=90.1%, 4=2.1%, 8=7.6%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=72.6%, 4=17.6%, 10=1.0%, 20=0.3%, 50=0.6%, 100=4.2%
     lat (msec): 250=3.5%, 500=0.0%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=29162
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=7.9%, 2=76.8%, 4=1.7%, 8=13.6%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=74.7%, 4=9.3%, 10=0.9%, 20=0.1%, 50=0.8%, 100=10.1%
     lat (msec): 250=3.6%, 500=0.0%, 750=0.0%, 1000=0.0%, >=2000=0.0%

Run status group 0 (all jobs):

Disk stats (read/write):
  cciss!c0d0: ios=1092/3441, merge=389/52071, ticks=16876/1341536, in_queue=1362764, util=97.40%
3.92user 1.31system 0:14.03elapsed 37%CPU (0avgtext+0avgdata 0maxresident)k
173016inputs+445896outputs (0major+2472minor)pagefaults 0swaps