stresser: (g=0): rw=write, bs=16K-16K/16K-16K, ioengine=mmap, iodepth=1 fio: mixed read/write workload with verify. May not work as expected, unless you pre-populated the file stresser: (g=1): rw=randrw, bs=16K-16K/16K-16K, ioengine=mmap, iodepth=4 Starting 2 processes stresser: Laying out IO file(s) (1 file(s) / 4096MiB) stresser: (groupid=0, jobs=1): err= 0: pid=29887 read : io=4,096MiB, bw=239MiB/s, iops=15,326, runt= 17104msec clat (usec): min=11, max=231, avg=12.78, stdev= 2.02 bw (KiB/s) : min= 0, max=248800, per=97.18%, avg=238310.40, stdev=42207.61 write: io=4,096MiB, bw=20,190KiB/s, iops=1,261, runt=207739msec clat (usec): min=14, max=734K, avg=591.11, stdev=9731.63 bw (KiB/s) : min= 0, max=83072, per=105.22%, avg=21243.66, stdev=20970.00 cpu : usr=31.44%, sys=3.89%, ctx=54707, majf=1, minf=2102309 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 r/w: total=262144/262144, short=0/0 lat (usec): 20=51.50%, 50=44.89%, 100=0.35%, 250=1.39%, 500=0.42% lat (usec): 750=0.23%, 1000=0.29% lat (msec): 2=0.40%, 4=0.06%, 10=0.13%, 20=0.10%, 50=0.08% lat (msec): 100=0.08%, 250=0.07%, 500=0.01%, 750=0.01% stresser: (groupid=1, jobs=1): err= 0: pid=30154 read : io=4,038MiB, bw=157MiB/s, iops=10,033, runt= 25759msec clat (usec): min=2, max=231, avg=16.14, stdev= 3.30 bw (KiB/s) : min= 0, max=238144, per=97.58%, avg=156649.23, stdev=39676.15 write: io=1,024MiB, bw=48,739KiB/s, iops=3,046, runt= 21514msec clat (usec): min=6, max=28,034, avg=21.11, stdev=109.49 bw (KiB/s) : min= 0, max=51040, per=97.78%, avg=47655.18, stdev=8134.09 cpu : usr=7.41%, sys=1.03%, ctx=13348, majf=0, minf=1114295 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 r/w: total=258447/65536, short=0/0 lat (usec): 4=0.01%, 10=1.54%, 20=77.46%, 50=20.97%, 100=0.01% lat (usec): 250=0.01% lat (msec): 50=0.01% Run status group 0 (all jobs): READ: io=4,096MiB, aggrb=239MiB/s, minb=239MiB/s, maxb=239MiB/s, mint=17104msec, maxt=17104msec WRITE: io=4,096MiB, aggrb=20,190KiB/s, minb=20,190KiB/s, maxb=20,190KiB/s, mint=207739msec, maxt=207739msec Run status group 1 (all jobs): READ: io=4,038MiB, aggrb=157MiB/s, minb=157MiB/s, maxb=157MiB/s, mint=25759msec, maxt=25759msec WRITE: io=1,024MiB, aggrb=48,739KiB/s, minb=48,739KiB/s, maxb=48,739KiB/s, mint=21514msec, maxt=21514msec Disk stats (read/write): sda: ios=16673/68647, merge=768/1227815, ticks=242848/110031577, in_queue=110274324, util=92.64% 97.69user 45.16system 10:53.82elapsed 21%CPU (0avgtext+0avgdata 16861296maxresident)k 8390928inputs+18761712outputs (8major+3220396minor)pagefaults 0swaps