root# LC_ALL=C fio --name=randread --rw=randread --bs=4k --ioengine=libaio --iodepth=64 --direct=1 --numjobs=1 --size=1G
randread: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=64
fio 1.59
Starting 1 process
randread: Laying out IO file(s) (1 file(s) / 1024MB)
Jobs: 1 (f=1): [r] [95.4% done] [99.42M/0K /s] [24.9K/0  iops] [eta 00m:06s]
randread: (groupid=0, jobs=1): err= 0: pid=2667
  read : io=1024.0MB, bw=8414.9KB/s, iops=2103 , runt=124611msec
    slat (usec): min=10 , max=334 , avg=12.70, stdev= 2.20
    clat (usec): min=3 , max=4002.9K, avg=30407.90, stdev=125176.49
     lat (usec): min=17 , max=4002.9K, avg=30420.81, stdev=125176.50
    bw (KB/s) : min= 4015, max=106776, per=97.50%, avg=8203.31, stdev=10305.31
  cpu          : usr=0.84%, sys=99.03%, ctx=499, majf=0, minf=69
  IO depths    : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=0.1%, >=64=100.0%
     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=0.1%, >=64=0.0%
     issued r/w/d: total=262144/0/0, short=0/0/0
     lat (usec): 4=0.01%, 10=50.46%, 20=8.13%, 50=19.64%, 100=7.28%
     lat (usec): 250=5.70%, 500=2.10%, 750=0.03%, 1000=0.03%
     lat (msec): 2=0.09%, 4=0.01%, 10=0.01%, 20=0.01%, 50=0.05%
     lat (msec): 100=0.16%, 250=0.51%, 500=2.78%, 750=2.78%, 1000=0.15%
     lat (msec): 2000=0.08%, >=2000=0.01%

Run status group 0 (all jobs):
   READ: io=1024.0MB, aggrb=8414KB/s, minb=8616KB/s, maxb=8616KB/s, mint=124611msec, maxt=124611msec

Disk stats (read/write):
  loop0: ios=260996/62, merge=0/2, ticks=8051072/48132, in_queue=8102608, util=100.00%
 
root# cat /proc/version 
Linux version 3.19.0-rc2-next20141231-3-loopmq-small (sedat.dilek@gmail.com@fambox) (gcc version 4.9.2 (Ubuntu 4.9.2-0ubuntu1~12.04) ) #1 SMP Thu Jan 1 15:35:53 CET 2015


-dileks // 01-JAN-2015