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=14504, got signal=6
Threads: 2
Threads: 2: [m_m] [10.0% done] [ 10312/     0 kb/s] [eta 00m:27s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=14503, got signal=6
Threads: 1: [__m] [11.1% done] [  1936/ 30696 kb/s] [eta 00m:32s]
Threads: 1: [__m] [12.5% done] [  1892/     0 kb/s] [eta 00m:35s]
Threads: 1: [__m] [30.0% done] [  1724/ 24116 kb/s] [eta 00m:14s]
Threads: 1: [__m] [41.2% done] [  1704/ 15508 kb/s] [eta 00m:10s]
Threads: 1: [__F] [100.0% done] [     0/ 40432 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: [__V] [68.4% done] [     0/     0 kb/s] [eta 00m:06s]
Threads: 1: [__V] [70.0% done] [  3360/     0 kb/s] [eta 00m:06s]
Threads: 1: [__V] [75.0% done] [  8984/     0 kb/s] [eta 00m:05s]
Threads: 1: [__V] [84.2% done] [ 13052/     0 kb/s] [eta 00m:03s]
Threads: 1: [__V] [89.5% done] [  8672/     0 kb/s] [eta 00m:02s]
Threads: 1: [__V] [100.0% done] [ 11236/     0 kb/s] [eta 00m:00s]
Threads: 1: [__V] [100.0% done] [ 11908/     0 kb/s] [eta 00m:00s]
Threads: 1: [__V] [100.0% done] [  6770/     0 kb/s] [eta 00m:00s]
Threads: 1: [__V] [100.0% done] [  7992/     0 kb/s] [eta 00m:00s]
fio: (groupid=0): err= 0: pid=14503
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.6%, 2=85.8%, 4=5.7%, 8=7.8%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=80.3%, 4=5.4%, 10=2.6%, 20=1.6%, 50=1.2%, 100=4.5%
     lat (msec): 250=3.5%, 500=0.7%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=14504
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.1%, 2=94.5%, 4=3.3%, 8=2.1%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=88.0%, 4=7.2%, 10=0.9%, 20=0.0%, 50=1.9%, 100=1.2%
     lat (msec): 250=0.5%, 500=0.0%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=14505
  read : io=100MiB, bw=4,700KiB/s, runt= 22286msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=    0, max=  783, avg=71.37, stdev=105.73
    bw (KiB/s) : min=   27, max=14100, per=118.17%, avg=6121.07, stdev=4452.90
  write: io=80,056KiB, bw=6,199KiB/s, runt= 13224msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=    0, max=  327, avg= 1.36, stdev=15.60
    bw (KiB/s) : min=    0, max=13189, per=31.04%, avg=6594.50, stdev=9326.03
  cpu          : usr=2.75%, sys=1.51%, ctx=5299
  IO depths    : 1=0.7%, 2=51.1%, 4=29.4%, 8=18.8%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=47.0%, 4=0.1%, 10=10.4%, 20=11.5%, 50=10.4%, 100=8.2%
     lat (msec): 250=8.8%, 500=2.6%, 750=0.7%, 1000=0.0%, >=2000=0.0%

Run status group 0 (all jobs):
   READ: io=110MiB, aggrb=5,180KiB/s, minb=0KiB/s, maxb=4,700KiB/s, mint=22286msec, maxt=22286msec
  WRITE: io=268MiB, aggrb=21,243KiB/s, minb=0KiB/s, maxb=6,199KiB/s, mint=22286msec, maxt=22286msec

Disk stats (read/write):
  sda: ios=1728/3031, merge=465/65334, ticks=40144/2878088, in_queue=2928912, util=98.81%
2.57user 0.82system 0:22.69elapsed 14%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+2489minor)pagefaults 0swaps