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=2106 read : io=4,096MiB, bw=238MiB/s, iops=15,236, runt= 17205msec clat (usec): min=11, max=144, avg=13.28, stdev= 2.10 bw (KiB/s) : min= 0, max=247392, per=97.13%, avg=236804.57, stdev=41549.20 write: io=4,096MiB, bw=20,780KiB/s, iops=1,298, runt=201834msec clat (usec): min=14, max=526K, avg=539.65, stdev=5998.68 bw (KiB/s) : min= 0, max=79360, per=100.96%, avg=20979.74, stdev=13644.56 cpu : usr=31.59%, sys=4.74%, ctx=132258, majf=1, minf=2102341 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=50.83%, 50=45.53%, 100=0.35%, 250=1.76%, 500=0.18% lat (usec): 750=0.10%, 1000=0.13% lat (msec): 2=0.20%, 4=0.12%, 10=0.27%, 20=0.19%, 50=0.18% lat (msec): 100=0.12%, 250=0.04%, 500=0.01%, 750=0.01% stresser: (groupid=1, jobs=1): err= 0: pid=2188 read : io=4,036MiB, bw=159MiB/s, iops=10,155, runt= 25433msec clat (usec): min=2, max=281, avg=15.05, stdev= 4.05 bw (KiB/s) : min= 0, max=247584, per=97.92%, avg=159106.51, stdev=43927.56 write: io=1,024MiB, bw=49,148KiB/s, iops=3,071, runt= 21335msec clat (usec): min=3, max=237, avg=19.89, stdev= 4.27 bw (KiB/s) : min= 0, max=52800, per=97.66%, avg=47997.70, stdev=8545.22 cpu : usr=7.20%, sys=1.22%, ctx=31830, majf=0, minf=1113545 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=258291/65536, short=0/0 lat (usec): 4=0.01%, 10=5.73%, 20=75.78%, 50=18.47%, 100=0.01% lat (usec): 250=0.01%, 500=0.01% Run status group 0 (all jobs): READ: io=4,096MiB, aggrb=238MiB/s, minb=238MiB/s, maxb=238MiB/s, mint=17205msec, maxt=17205msec WRITE: io=4,096MiB, aggrb=20,780KiB/s, minb=20,780KiB/s, maxb=20,780KiB/s, mint=201834msec, maxt=201834msec Run status group 1 (all jobs): READ: io=4,036MiB, aggrb=159MiB/s, minb=159MiB/s, maxb=159MiB/s, mint=25433msec, maxt=25433msec WRITE: io=1,024MiB, aggrb=49,148KiB/s, minb=49,148KiB/s, maxb=49,148KiB/s, mint=21335msec, maxt=21335msec Disk stats (read/write): sda: ios=16669/62819, merge=770/1225410, ticks=241576/107215471, in_queue=107458473, util=93.16% 105.38user 45.07system 12:19.59elapsed 20%CPU (0avgtext+0avgdata 16861264maxresident)k 8390832inputs+18758280outputs (8major+3219800minor)pagefaults 0swaps