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
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=3654, got signal=6
Threads: 2: [m_m] [18.8% done] [ 16367/ 17464 kb/s] [eta 00m:13s]
Threads: 2: [m_m] [36.4% done] [ 15769/ 23754 kb/s] [eta 00m:07s]
Threads: 2: [m_m] [62.5% done] [ 12991/ 49672 kb/s] [eta 00m:03s]
Threads: 2: [m_m] [60.0% done] [  2306/  1688 kb/s] [eta 00m:04s]
Threads: 2: [m_m] [63.6% done] [  1171/ 19585 kb/s] [eta 00m:04s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=3655, got signal=6
Threads: 1: [m__] [66.7% done] [  1126/  3396 kb/s] [eta 00m:04s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=3653, got signal=6

fio: (groupid=0): err= 0: pid=3653
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=14.2%, 2=50.4%, 4=7.2%, 8=28.3%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=59.0%, 4=5.0%, 10=0.8%, 20=1.6%, 50=7.6%, 100=12.4%
     lat (msec): 250=10.5%, 500=2.8%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=3654
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.4%, 2=89.3%, 4=3.4%, 8=6.9%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=78.5%, 4=11.1%, 10=1.8%, 20=0.9%, 50=0.2%, 100=2.3%
     lat (msec): 250=4.9%, 500=0.0%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=3655
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.3%, 2=68.5%, 4=7.9%, 8=23.3%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=58.6%, 4=9.3%, 10=1.2%, 20=2.8%, 50=6.3%, 100=11.0%
     lat (msec): 250=9.2%, 500=1.2%, 750=0.0%, 1000=0.0%, >=2000=0.0%

Run status group 0 (all jobs):

Disk stats (read/write):
  cciss!c0d0: ios=1799/1029, merge=408/21144, ticks=25188/432016, in_queue=576928, util=98.46%
3.52user 1.05system 0:09.09elapsed 50%CPU (0avgtext+0avgdata 0maxresident)k
203648inputs+450208outputs (0major+2450minor)pagefaults 0swaps