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=8109, got signal=6
Threads: 2
Threads: 2: [mm_] [23.1% done] [ 16201/ 26290 kb/s] [eta 00m:10s]
Threads: 2: [mm_] [44.4% done] [  6871/ 54003 kb/s] [eta 00m:05s]
Threads: 2: [Fm_] [50.0% done] [  6253/ 21475 kb/s] [eta 00m:05s]
Threads: 2: [Fm_] [54.5% done] [   869/  8443 kb/s] [eta 00m:05s]
Threads: 2: [Fm_] [53.8% done] [   975/     0 kb/s] [eta 00m:06s]
Threads: 2: [Fm_] [61.5% done] [   938/  8708 kb/s] [eta 00m:05s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=8108, got signal=6
Threads: 1: [F__] [100.0% done] [  1011/ 11434 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]
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=8107, got signal=6

fio: (groupid=0): err= 0: pid=8107
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.4%, 2=79.4%, 4=3.2%, 8=16.9%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=69.5%, 4=10.6%, 10=0.8%, 20=0.2%, 50=1.7%, 100=15.1%
     lat (msec): 250=1.8%, 500=0.0%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=8108
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.3%, 2=63.7%, 4=4.9%, 8=31.1%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=55.5%, 4=8.1%, 10=0.8%, 20=0.2%, 50=3.9%, 100=21.3%
     lat (msec): 250=5.6%, 500=4.4%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=8109
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.2%, 2=91.5%, 4=8.0%, 8=0.2%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=83.0%, 4=13.9%, 10=2.9%, 20=0.0%, 50=0.0%, 100=0.0%
     lat (msec): 250=0.0%, 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=1148/3339, merge=342/54096, ticks=15796/1387152, in_queue=1408408, util=94.26%
3.60user 1.29system 0:14.70elapsed 33%CPU (0avgtext+0avgdata 0maxresident)k
153432inputs+461632outputs (0major+2472minor)pagefaults 0swaps