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] [10.3% done] [ 13593/  4531 kb/s] [eta 00m:26s]
Threads: 3: [mmm] [13.3% done] [ 10490/  5739 kb/s] [eta 00m:26s]
Threads: 3: [mmm] [16.1% done] [  9936/  6748 kb/s] [eta 00m:26s]
Threads: 3: [mmm] [20.0% done] [ 14403/     0 kb/s] [eta 00m:24s]
Threads: 3: [mmm] [23.3% done] [  6158/  9595 kb/s] [eta 00m:23s]
Threads: 3: [mmm] [26.7% done] [  6024/  8419 kb/s] [eta 00m:22s]
Threads: 3: [mmm] [29.0% done] [  9623/  3839 kb/s] [eta 00m:22s]
Threads: 3: [mmm] [32.3% done] [  6381/  8220 kb/s] [eta 00m:21s]
Threads: 3: [mmm] [35.5% done] [  7236/  4100 kb/s] [eta 00m:20s]
Threads: 3: [mmm] [38.7% done] [ 11966/  4462 kb/s] [eta 00m:19s]
Threads: 3: [mmm] [41.9% done] [ 12129/  3050 kb/s] [eta 00m:18s]
Threads: 3: [mmm] [45.2% done] [  8590/  5873 kb/s] [eta 00m:17s]
Threads: 3: [mmm] [48.4% done] [  8867/  4844 kb/s] [eta 00m:16s]
Threads: 3: [mmm] [51.6% done] [ 10246/  3803 kb/s] [eta 00m:15s]
Threads: 3: [mmm] [53.1% done] [  7248/  4567 kb/s] [eta 00m:15s]
Threads: 3: [mmm] [56.2% done] [  9985/  2448 kb/s] [eta 00m:14s]
Threads: 3: [mmm] [57.6% done] [  7195/  2887 kb/s] [eta 00m:14s]
Threads: 3: [mmm] [60.6% done] [  8513/  1407 kb/s] [eta 00m:13s]
Threads: 3: [mmm] [61.8% done] [  6935/  1321 kb/s] [eta 00m:13s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=6356, got signal=6
Threads: 2: [mm_] [62.9% done] [  4738/  3567 kb/s] [eta 00m:13s]
Threads: 2: [mm_] [65.7% done] [  7154/   138 kb/s] [eta 00m:12s]
Threads: 2: [mV_] [66.7% done] [ 19308/  1830 kb/s] [eta 00m:12s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=6354, got signal=6
Threads: 1: [_V_] [89.3% done] [ 16929/   117 kb/s] [eta 00m:03s]
fio: (groupid=0): err= 0: pid=6354
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.1%, 2=0.1%, 4=5.3%, 8=94.4%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.0%, 4=0.0%, 10=0.0%, 20=0.2%, 50=15.2%, 100=45.3%
     lat (msec): 250=23.8%, 500=14.6%, 750=0.4%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=6355
  read : io=100MiB, bw=4,139KiB/s, runt= 25229msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=    1, max=  539, avg=83.62, stdev=82.08
    bw (KiB/s) : min=  241, max=19136, per=48.09%, avg=4695.38, stdev=4190.43
  write: io=35,108KiB, bw=1,550KiB/s, runt= 23179msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=   34, max=  499, avg=126.84, stdev=82.63
    bw (KiB/s) : min=    0, max= 8391, per=66.24%, avg=2956.84, stdev=2544.36
  cpu          : usr=0.78%, sys=0.24%, ctx=8263
  IO depths    : 1=0.1%, 2=0.4%, 4=14.7%, 8=84.8%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.1%, 4=0.6%, 10=3.4%, 20=6.4%, 50=21.3%, 100=40.0%
     lat (msec): 250=17.4%, 500=9.9%, 750=0.6%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=6356
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.1%, 2=0.1%, 4=8.3%, 8=91.4%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.0%, 4=0.0%, 10=0.0%, 20=1.0%, 50=17.5%, 100=51.2%
     lat (msec): 250=14.7%, 500=15.1%, 750=0.0%, 1000=0.0%, >=2000=0.0%

Run status group 0 (all jobs):
   READ: io=235MiB, aggrb=9,763KiB/s, minb=0KiB/s, maxb=4,139KiB/s, mint=0msec, maxt=25229msec
  WRITE: io=99MiB, aggrb=4,464KiB/s, minb=0KiB/s, maxb=1,550KiB/s, mint=0msec, maxt=25229msec

Disk stats (read/write):
  cciss!c0d0: ios=4597/2005, merge=808/307, ticks=60808/42656, in_queue=103456, util=99.40%
0.59user 0.31system 0:25.56elapsed 3%CPU (0avgtext+0avgdata 0maxresident)k
481208inputs+202152outputs (0major+2456minor)pagefaults 0swaps