fio --name=/rpool/testfile --ioengine=libaio --iodepth=32 --rw=randwrite --bs=4k --direct=1 --size=1G --numjobs=1 --group_reporting
/rpool/testfile: (g=0): rw=randwrite, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=32
fio-3.12
Starting 1 process
/rpool/testfile: Laying out IO file (1 file / 1024MiB)
Jobs: 1 (f=1): [w(1)][100.0%][w=216MiB/s][w=55.3k IOPS][eta 00m:00s]
/rpool/testfile: (groupid=0, jobs=1): err= 0: pid=25570: Thu Sep 12 00:43:10 2019
write: IOPS=37.0k, BW=145MiB/s (152MB/s)(1024MiB/7081msec); 0 zone resets
slat (usec): min=5, max=103661, avg=25.07, stdev=533.98
clat (usec): min=2, max=108397, avg=838.16, stdev=3240.21
lat (usec): min=12, max=108437, avg=863.39, stdev=3297.83
clat percentiles (usec):
| 1.00th=[ 265], 5.00th=[ 277], 10.00th=[ 289], 20.00th=[ 314],
| 30.00th=[ 351], 40.00th=[ 400], 50.00th=[ 465], 60.00th=[ 545],
| 70.00th=[ 635], 80.00th=[ 766], 90.00th=[ 1090], 95.00th=[ 1549],
| 99.00th=[ 7570], 99.50th=[ 12780], 99.90th=[ 39060], 99.95th=[103285],
| 99.99th=[106431]
bw ( KiB/s): min=72181, max=248040, per=98.63%, avg=146056.57, stdev=56510.07, samples=14
iops : min=18045, max=62010, avg=36514.07, stdev=14127.57, samples=14
lat (usec) : 4=0.01%, 20=0.01%, 50=0.01%, 100=0.01%, 250=0.15%
lat (usec) : 500=54.52%, 750=24.22%, 1000=9.41%
lat (msec) : 2=8.15%, 4=1.61%, 10=1.23%, 20=0.49%, 50=0.16%
lat (msec) : 100=0.01%, 250=0.07%
cpu : usr=7.08%, sys=58.63%, ctx=16917, majf=0, minf=9
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%, >=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.1%, 64=0.0%, >=64=0.0%
issued rwts: total=0,262144,0,0 short=0,0,0,0 dropped=0,0,0,0
latency : target=0, window=0, percentile=100.00%, depth=32
Run status group 0 (all jobs):
WRITE: bw=145MiB/s (152MB/s), 145MiB/s-145MiB/s (152MB/s-152MB/s), io=1024MiB (1074MB), run=7081-7081msec