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
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=1972, got signal=6
Threads: 2
Threads: 2: [m_m] [33.3% done] [ 13321/     0 kb/s] [eta 00m:06s]
Threads: 2: [m_F] [36.4% done] [  5197/ 21150 kb/s] [eta 00m:07s]
Threads: 2: [m_F] [35.7% done] [   260/     0 kb/s] [eta 00m:09s]
Threads: 2: [m_F] [35.3% done] [   601/     0 kb/s] [eta 00m:11s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=1973, got signal=6
Threads: 1: [m__] [43.8% done] [ 11014/   239 kb/s] [eta 00m:09s]
Threads: 1: [m__] [66.7% done] [  3254/ 31084 kb/s] [eta 00m:04s]
Threads: 1: [F__] [100.0% done] [     0/  4010 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=1971, got signal=6

fio: (groupid=0): err= 0: pid=1971
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=15.5%, 2=39.9%, 4=19.6%, 8=25.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=66.2%, 4=2.7%, 10=0.3%, 20=0.3%, 50=9.8%, 100=12.5%
     lat (msec): 250=6.1%, 500=0.7%, 750=0.2%, 1000=0.1%, >=2000=0.8%
fio: (groupid=0): err= 0: pid=1972
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.2%, 2=77.7%, 4=19.8%, 8=2.3%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=92.7%, 4=4.0%, 10=0.8%, 20=0.1%, 50=0.2%, 100=0.3%
     lat (msec): 250=1.8%, 500=0.0%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=1973
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=9.9%, 2=60.9%, 4=13.0%, 8=16.2%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=72.4%, 4=7.4%, 10=0.6%, 20=0.1%, 50=5.1%, 100=12.3%
     lat (msec): 250=1.6%, 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=1224/1656, merge=46/37735, ticks=16152/617668, in_queue=633820, util=92.95%
2.25user 2.00system 0:10.52elapsed 40%CPU (0avgtext+0avgdata 0maxresident)k
133512inputs+500800outputs (0major+2462minor)pagefaults 0swaps