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] [11.1% done] [  8269/ 12271 kb/s] [eta 00m:24s]
Threads: 3: [mmm] [15.4% done] [ 11254/  8304 kb/s] [eta 00m:22s]
Threads: 3: [mmm] [20.0% done] [ 10416/  9176 kb/s] [eta 00m:20s]
Threads: 3: [mmm] [24.0% done] [ 12899/  6050 kb/s] [eta 00m:19s]
Threads: 3: [mmm] [26.9% done] [  8344/ 10109 kb/s] [eta 00m:19s]
Threads: 3: [mmm] [30.8% done] [  9582/  7305 kb/s] [eta 00m:18s]
Threads: 3: [mmm] [36.0% done] [  5828/ 12436 kb/s] [eta 00m:16s]
Threads: 3: [mmm] [38.5% done] [  9152/  5368 kb/s] [eta 00m:16s]
Threads: 3: [mmm] [42.3% done] [ 12384/   116 kb/s] [eta 00m:15s]
Threads: 3: [mmm] [46.2% done] [  5296/  8576 kb/s] [eta 00m:14s]
Threads: 3: [mmm] [50.0% done] [  5884/  7244 kb/s] [eta 00m:13s]
Threads: 3: [mmm] [51.9% done] [  7404/  4572 kb/s] [eta 00m:13s]
Threads: 3: [mmm] [55.6% done] [  6976/  3812 kb/s] [eta 00m:12s]
Threads: 3: [mmm] [57.1% done] [  6444/  3120 kb/s] [eta 00m:12s]
Threads: 3: [mmm] [58.6% done] [  5072/  4736 kb/s] [eta 00m:12s]
Threads: 3: [mmm] [60.0% done] [  6380/  2440 kb/s] [eta 00m:12s]
Threads: 3: [mmm] [63.3% done] [  5968/  2136 kb/s] [eta 00m:11s]
Threads: 3: [mmm] [64.5% done] [  3872/  4224 kb/s] [eta 00m:11s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=25257, got signal=6
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=25256, got signal=6
Threads: 1: [__m] [65.6% done] [  1472/  6396 kb/s] [eta 00m:11s]
Threads: 1: [__V] [78.6% done] [ 15320/  3168 kb/s] [eta 00m:06s]
Threads: 1: [__V] [92.0% done] [ 23556/     0 kb/s] [eta 00m:02s]
fio: (groupid=0): err= 0: pid=25256
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.5%, 2=2.1%, 4=27.2%, 8=70.2%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=1.4%, 4=0.1%, 10=0.8%, 20=2.6%, 50=14.4%, 100=35.4%
     lat (msec): 250=43.2%, 500=1.1%, 750=0.3%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=25257
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.9%, 2=4.0%, 4=37.8%, 8=57.4%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=1.0%, 4=0.3%, 10=1.2%, 20=3.7%, 50=18.5%, 100=25.9%
     lat (msec): 250=47.2%, 500=0.6%, 750=0.5%, 1000=0.5%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=25258
  read : io=100MiB, bw=4,379KiB/s, runt= 23920msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=    1, max=  647, avg=74.35, stdev=66.72
    bw (KiB/s) : min=   95, max=25136, per=61.76%, avg=5691.00, stdev=7152.96
  write: io=47,340KiB, bw=2,215KiB/s, runt= 21880msec
    slat (msec): min=    0, max=    0, avg= 0.00, stdev= 0.00
    clat (msec): min=    0, max=  543, avg=97.39, stdev=85.33
    bw (KiB/s) : min=    0, max= 9890, per=50.06%, avg=3258.86, stdev=2916.59
  cpu          : usr=0.40%, sys=0.67%, ctx=5569
  IO depths    : 1=0.9%, 2=4.3%, 4=42.4%, 8=52.4%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=0.6%, 4=0.2%, 10=6.6%, 20=12.0%, 50=24.4%, 100=19.5%
     lat (msec): 250=33.6%, 500=2.4%, 750=0.3%, 1000=0.0%, >=2000=0.0%

Run status group 0 (all jobs):
   READ: io=210MiB, aggrb=9,214KiB/s, minb=0KiB/s, maxb=4,379KiB/s, mint=23920msec, maxt=23920msec
  WRITE: io=136MiB, aggrb=6,510KiB/s, minb=0KiB/s, maxb=2,215KiB/s, mint=23920msec, maxt=23920msec

Disk stats (read/write):
  sda: ios=3492/2492, merge=497/377, ticks=41196/43272, in_queue=84464, util=98.36%
0.39user 0.45system 0:24.32elapsed 3%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+2478minor)pagefaults 0swaps