V:\temp>fio -filename=4g.tmp -direct=1 -rw=randwrite -bs=4k -size=1G -name=randwrite -runtime=60 fio: this platform does not support process shared mutexes, forcing use of threads. Use the 'thread' option to get rid of this warning. randwrite: (g=0): rw=randwrite, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=windowsaio, iodepth=1 fio-3.30 Starting 1 thread randwrite: Laying out IO file (1 file / 1024MiB) Jobs: 1 (f=0): [f(1)][100.0%][w=4220KiB/s][w=1055 IOPS][eta 00m:00s] randwrite: (groupid=0, jobs=1): err= 0: pid=10776: Sat Apr 9 00:34:18 2022 write: IOPS=1846, BW=7386KiB/s (7563kB/s)(433MiB/60001msec); 0 zone resets slat (usec): min=32, max=498079, avg=119.24, stdev=1512.02 clat (usec): min=2, max=1231.7k, avg=415.05, stdev=8482.21 lat (usec): min=78, max=1231.9k, avg=534.29, stdev=8616.10 clat percentiles (usec): | 1.00th=[ 67], 5.00th=[ 88], 10.00th=[ 95], 20.00th=[ 103], | 30.00th=[ 111], 40.00th=[ 117], 50.00th=[ 123], 60.00th=[ 130], | 70.00th=[ 141], 80.00th=[ 161], 90.00th=[ 219], 95.00th=[ 247], | 99.00th=[ 742], 99.50th=[ 4555], 99.90th=[ 61604], 99.95th=[ 90702], | 99.99th=[233833] bw ( KiB/s): min= 7, max=18020, per=100.00%, avg=7587.75, stdev=3950.80, samples=114 iops : min= 1, max= 4505, avg=1896.66, stdev=987.69, samples=114 lat (usec) : 4=0.02%, 10=0.01%, 20=0.01%, 50=0.13%, 100=15.52% lat (usec) : 250=79.80%, 500=3.21%, 750=0.30%, 1000=0.11% lat (msec) : 2=0.23%, 4=0.14%, 10=0.08%, 20=0.08%, 50=0.21% lat (msec) : 100=0.11%, 250=0.03%, 500=0.01%, 750=0.01%, 2000=0.01% cpu : usr=1.67%, sys=18.33%, ctx=0, majf=0, minf=0 IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=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=0.0%, 64=0.0%, >=64=0.0% issued rwts: total=0,110795,0,0 short=0,0,0,0 dropped=0,0,0,0 latency : target=0, window=0, percentile=100.00%, depth=1 Run status group 0 (all jobs): WRITE: bw=7386KiB/s (7563kB/s), 7386KiB/s-7386KiB/s (7563kB/s-7563kB/s), io=433MiB (454MB), run=60001-60001msec V:\temp>