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=18370 read : io=4,096MiB, bw=239MiB/s, iops=15,267, runt= 17170msec clat (usec): min=10, max=146, avg=13.21, stdev= 2.53 bw (KiB/s) : min= 0, max=251584, per=97.12%, avg=237254.40, stdev=41874.47 write: io=4,096MiB, bw=21,204KiB/s, iops=1,325, runt=197807msec clat (usec): min=13, max=795K, avg=553.89, stdev=9652.96 bw (KiB/s) : min= 0, max=82016, per=105.76%, avg=22424.89, stdev=21927.98 cpu : usr=31.89%, sys=3.94%, ctx=86075, majf=1, minf=2102310 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=52.18%, 50=44.34%, 100=0.20%, 250=1.47%, 500=0.32% lat (usec): 750=0.25%, 1000=0.31% lat (msec): 2=0.42%, 4=0.06%, 10=0.13%, 20=0.09%, 50=0.08% lat (msec): 100=0.08%, 250=0.06%, 500=0.01%, 750=0.01%, 1000=0.01% stresser: (groupid=1, jobs=1): err= 0: pid=18612 read : io=4,039MiB, bw=156MiB/s, iops=9,985, runt= 25883msec clat (usec): min=2, max=3,071, avg=13.58, stdev= 6.95 bw (KiB/s) : min= 0, max=247392, per=99.93%, avg=159661.64, stdev=44307.12 write: io=1,024MiB, bw=48,148KiB/s, iops=3,009, runt= 21778msec clat (usec): min=2, max=799K, avg=32.64, stdev=3195.72 bw (KiB/s) : min= 0, max=53440, per=99.97%, avg=48134.83, stdev=9585.22 cpu : usr=6.78%, sys=0.96%, ctx=21008, majf=0, minf=1114571 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=258467/65536, short=0/0 lat (usec): 4=0.01%, 10=8.50%, 20=83.18%, 50=8.27%, 100=0.02% lat (usec): 250=0.01% lat (msec): 4=0.01%, 250=0.01%, 1000=0.01% Run status group 0 (all jobs): READ: io=4,096MiB, aggrb=239MiB/s, minb=239MiB/s, maxb=239MiB/s, mint=17170msec, maxt=17170msec WRITE: io=4,096MiB, aggrb=21,204KiB/s, minb=21,204KiB/s, maxb=21,204KiB/s, mint=197807msec, maxt=197807msec Run status group 1 (all jobs): READ: io=4,039MiB, aggrb=156MiB/s, minb=156MiB/s, maxb=156MiB/s, mint=25883msec, maxt=25883msec WRITE: io=1,024MiB, aggrb=48,149KiB/s, minb=48,149KiB/s, maxb=48,149KiB/s, mint=21778msec, maxt=21778msec Disk stats (read/write): sda: ios=16724/71717, merge=718/1224867, ticks=226014/114750226, in_queue=114976127, util=92.98% 96.65user 47.44system 11:44.78elapsed 20%CPU (0avgtext+0avgdata 16861280maxresident)k 8390832inputs+18762736outputs (8major+3220733minor)pagefaults 0swaps