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=14493 read : io=4,096MiB, bw=218MiB/s, iops=13,949, runt= 18792msec clat (usec): min=14, max=124, avg=19.48, stdev= 1.90 bw (KiB/s) : min= 0, max=236480, per=97.28%, avg=217136.00, stdev=36382.65 write: io=4,096MiB, bw=20,554KiB/s, iops=1,284, runt=204055msec clat (usec): min=16, max=477K, avg=550.41, stdev=6324.97 bw (KiB/s) : min= 0, max=78816, per=101.46%, avg=20854.05, stdev=14043.62 cpu : usr=31.41%, sys=5.42%, ctx=125348, majf=1, minf=2102342 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=17.70%, 50=76.37%, 100=2.58%, 250=1.69%, 500=0.27% lat (usec): 750=0.12%, 1000=0.15% lat (msec): 2=0.20%, 4=0.13%, 10=0.27%, 20=0.21%, 50=0.16% lat (msec): 100=0.10%, 250=0.04%, 500=0.01% stresser: (groupid=1, jobs=1): err= 0: pid=14608 read : io=4,038MiB, bw=154MiB/s, iops=9,855, runt= 26222msec clat (usec): min=2, max=231, avg=18.08, stdev= 4.74 bw (KiB/s) : min= 0, max=238592, per=97.78%, avg=154186.46, stdev=40232.03 write: io=1,024MiB, bw=47,814KiB/s, iops=2,988, runt= 21930msec clat (usec): min=3, max=257, avg=23.43, stdev= 4.22 bw (KiB/s) : min= 0, max=50752, per=97.70%, avg=46716.36, stdev=7327.51 cpu : usr=6.48%, sys=1.15%, ctx=8287, majf=0, minf=1114673 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=258431/65536, short=0/0 lat (usec): 4=0.01%, 10=2.78%, 20=36.21%, 50=60.97%, 100=0.02% lat (usec): 250=0.01%, 500=0.01% Run status group 0 (all jobs): READ: io=4,096MiB, aggrb=218MiB/s, minb=218MiB/s, maxb=218MiB/s, mint=18792msec, maxt=18792msec WRITE: io=4,096MiB, aggrb=20,554KiB/s, minb=20,554KiB/s, maxb=20,554KiB/s, mint=204055msec, maxt=204055msec Run status group 1 (all jobs): READ: io=4,038MiB, aggrb=154MiB/s, minb=154MiB/s, maxb=154MiB/s, mint=26222msec, maxt=26222msec WRITE: io=1,024MiB, aggrb=47,815KiB/s, minb=47,815KiB/s, maxb=47,815KiB/s, mint=21930msec, maxt=21930msec Disk stats (read/write): sda: ios=16615/71382, merge=825/1225113, ticks=249041/127500863, in_queue=127749773, util=93.22% 105.76user 48.37system 12:52.30elapsed 19%CPU (0avgtext+0avgdata 16861120maxresident)k 8390608inputs+18762296outputs (8major+3221078minor)pagefaults 0swaps