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] [13.0% done] [ 10077/ 10528 kb/s] [eta 00m:20s]
Threads: 3: [mmm] [16.7% done] [  8000/ 12812 kb/s] [eta 00m:20s]
Threads: 3: [mmm] [20.8% done] [ 16026/  4189 kb/s] [eta 00m:19s]
Threads: 3: [mmm] [24.0% done] [ 11718/  7537 kb/s] [eta 00m:19s]
Threads: 3: [mmm] [28.0% done] [ 13768/  4767 kb/s] [eta 00m:18s]
Threads: 3: [mmm] [32.0% done] [ 14919/  2521 kb/s] [eta 00m:17s]
Threads: 3: [mmm] [34.6% done] [ 11064/  5660 kb/s] [eta 00m:17s]
Threads: 3: [mmm] [38.5% done] [  9408/  7016 kb/s] [eta 00m:16s]
Threads: 3: [mmm] [40.7% done] [  9001/  5710 kb/s] [eta 00m:16s]
Threads: 3: [mmm] [44.4% done] [  8899/  6278 kb/s] [eta 00m:15s]
Threads: 3: [mmm] [48.1% done] [ 10807/  3526 kb/s] [eta 00m:14s]
Threads: 3: [mmm] [51.9% done] [  8501/  4726 kb/s] [eta 00m:13s]
Threads: 3: [mmm] [53.6% done] [  8135/  2558 kb/s] [eta 00m:13s]
Threads: 3: [mmm] [55.2% done] [  2970/  7265 kb/s] [eta 00m:13s]
Threads: 3: [mmm] [58.6% done] [  1353/  7367 kb/s] [eta 00m:12s]
Threads: 3: [mmm] [60.0% done] [  4775/  4441 kb/s] [eta 00m:12s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=25568, got signal=6
Threads: 2: [m_m] [61.3% done] [  3884/  3348 kb/s] [eta 00m:12s]
Threads: 2: [m_m] [62.5% done] [  8623/   292 kb/s] [eta 00m:12s]
Threads: 2: [m_V] [63.6% done] [ 27085/     0 kb/s] [eta 00m:12s]
Threads: 1: [m__] [64.7% done] [ 19094/     0 kb/s] [eta 00m:12s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=25567, got signal=6

fio: (groupid=0): err= 0: pid=25567
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.1%, 2=0.1%, 4=6.4%, 8=93.4%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.0%, 4=0.1%, 10=0.4%, 20=2.4%, 50=13.3%, 100=31.4%
     lat (msec): 250=49.9%, 500=1.2%, 750=0.2%, 1000=0.6%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=25568
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.2%, 2=0.3%, 4=5.2%, 8=94.3%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.0%, 4=0.0%, 10=0.4%, 20=0.3%, 50=8.9%, 100=47.9%
     lat (msec): 250=42.1%, 500=0.0%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=25569
  read : io=100MiB, bw=4,822KiB/s, runt= 21713msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=    1, max=  227, avg=58.25, stdev=43.61
    bw (KiB/s) : min=   46, max=30589, per=53.81%, avg=6091.86, stdev=7580.13
  write: io=41,916KiB, bw=2,142KiB/s, runt= 20035msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=   47, max=  339, avg=108.09, stdev=33.89
    bw (KiB/s) : min=    0, max= 8830, per=51.76%, avg=2879.95, stdev=2320.72
  cpu          : usr=0.39%, sys=0.48%, ctx=7581
  IO depths    : 1=0.2%, 2=1.1%, 4=18.3%, 8=80.4%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.1%, 4=1.3%, 10=7.0%, 20=10.5%, 50=15.8%, 100=37.7%
     lat (msec): 250=27.1%, 500=0.3%, 750=0.0%, 1000=0.0%, >=2000=0.0%

Run status group 0 (all jobs):
   READ: io=234MiB, aggrb=11,321KiB/s, minb=0KiB/s, maxb=4,822KiB/s, mint=21713msec, maxt=21713msec
  WRITE: io=106MiB, aggrb=5,564KiB/s, minb=0KiB/s, maxb=2,142KiB/s, mint=21713msec, maxt=21713msec

Disk stats (read/write):
  cciss!c0d0: ios=4503/2422, merge=701/199, ticks=48248/36768, in_queue=85016, util=98.38%
0.21user 0.52system 0:23.22elapsed 3%CPU (0avgtext+0avgdata 0maxresident)k
480160inputs+217784outputs (0major+2451minor)pagefaults 0swaps