Re: random i/o speedup weirdness

> This status is for all groups, as you only have one the min/max/etc
> values will be the same. It's the same as the read value you have above,
> 3081KiB/sec. Is that not the correct number?

ah, I misunderstood - if that "min" means "slowest group's value" then it's OK
:)

however the value 3081KiB/s is not realistic -- the avg=708.51
(displayed in the "bw" line) is closer to the truth.

> Hmm, please post the full output, thanks!

-- cut --
root_at_pcitfiol25:/mnt/scratch/fio/new-fio# /usr/src/fio/fio --version
fio 1.16.3
root_at_pcitfiol25:/mnt/scratch/fio/new-fio# cat sdc1.conf
[global]
bs=4k
direct=1
rw=randread
ioengine=libaio
iodepth=2
randrepeat=1
write_bw_log
write_lat_log

[/dev/sdc1]

root_at_pcitfiol25:/mnt/scratch/fio/new-fio# /usr/src/fio/fio sdc1.conf
/dev/sdc1: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=2
Starting 1 process
Jobs: 1 (f=1): [r] [100.0% done] [ 0/ 0 kb/s] [eta 00m:00s]0s]
/dev/sdc1: (groupid=0, jobs=1): err= 0: pid=15443
  read : io=7,534MiB, bw=3,081KiB/s, iops=752, runt=2563805msec
    slat (msec): min= 0, max= 0, avg= 0.00, stdev= 0.00
    clat (msec): min= 0, max= 33, avg=11.04, stdev= 2.80
    bw (KiB/s) : min= 611, max= 1417, per=23.00%, avg=708.51, stdev=28.81
  cpu : usr=0.07%, sys=0.63%, ctx=1928282
  IO depths : 1=0.1%, 2=100.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     issued r/w: total=1928754/0, short=0/0
     lat (msec): 2=0.03%, 4=0.18%, 10=29.39%, 20=70.03%, 50=0.37%, 100=0.00%
     lat (msec): 250=0.00%, 500=0.00%, 750=0.00%, 1000=0.00%, >=2000=0.00%

Run status group 0 (all jobs):
   READ: io=7,534MiB, aggrb=3,081KiB/s, minb=3,081KiB/s, maxb=3,081KiB/s, mint=2563805msec, maxt=2563805msec

Disk stats (read/write):
  sdc: ios=1928754/0, merge=0/0, ticks=22248216/0, in_queue=22248160, util=100.00%
-- cut --

cheers,

Andras
Received on Thu May 31 2007 - 09:46:37 CEST