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=30188, got signal=6
Threads: 2: [_mm] [42.9% done] [  8078/ 77714 kb/s] [eta 00m:04s]
Threads: 2: [_mm] [66.7% done] [  7736/ 34503 kb/s] [eta 00m:02s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=30189, got signal=6
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=30190, got signal=6

fio: (groupid=0): err= 0: pid=30188
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.5%, 2=89.0%, 4=3.9%, 8=6.6%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=77.5%, 4=12.1%, 10=1.9%, 20=1.0%, 50=0.8%, 100=4.0%
     lat (msec): 250=2.1%, 500=0.0%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=30189
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=5.3%, 2=45.6%, 4=28.1%, 8=20.9%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=23.2%, 4=19.8%, 10=31.2%, 20=4.9%, 50=9.5%, 100=8.5%
     lat (msec): 250=2.7%, 500=0.0%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=30190
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=8.1%, 2=28.3%, 4=39.0%, 8=24.7%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=12.3%, 4=18.0%, 10=38.2%, 20=11.6%, 50=4.7%, 100=11.4%
     lat (msec): 250=2.9%, 500=0.5%, 750=0.0%, 1000=0.0%, >=2000=0.0%

Run status group 0 (all jobs):

Disk stats (read/write):
  cciss!c0d0: ios=1197/48, merge=268/3434, ticks=13364/4992, in_queue=43996, util=76.40%
3.35user 1.03system 0:05.23elapsed 83%CPU (0avgtext+0avgdata 0maxresident)k
128272inputs+514704outputs (0major+2441minor)pagefaults 0swaps