Hi Jens,
Sorry my update lacked precision. I want to tell that the output of my command is not correct because the IO profile is the same at 70% randread and 30%randwrite (graph from SAN tools).
I don't want to tell that the Andrey explanation is wrong.
I tried this but it seems the problem is that i don't understand the documentation so it's why i don't have that i expect.
# cat test.conf
[global]
ioengine=posixaio
invalidate=0
norandommap
ramp_time=5
iodepth=8
runtime=60
time_based
direct=1
numjobs=1
group_reporting
filesize=103M
blocksize=8k
#rw=randrw
rwmixread=70
percentage_random=12,8
[hdisk2]
stonewall
filename=/dev/rhdisk2
# ./fio test.conf
hdisk2: (g=0): rw=read, bs=8K-8K/8K-8K/8K-8K, ioengine=posixaio, iodepth=8
fio-2.3
Starting 1 process
Jobs: 1 (f=1): [R(1)] [100.0% done] [217.2MB/0KB/0KB /s] [27.8K/0/0 iops] [eta 00m:00s]
hdisk2: (groupid=0, jobs=1): err= 0: pid=213240: Fri Mar 25 07:27:47 2016
read : io=12872MB, bw=219671KB/s, iops=27458, runt= 60001msec
slat (usec): min=14, max=9705, avg=28.74, stdev=34.99
clat (usec): min=2, max=10363, avg=221.22, stdev=48.30
lat (usec): min=144, max=10382, avg=249.52, stdev=50.07
clat percentiles (usec):
| 1.00th=[ 149], 5.00th=[ 165], 10.00th=[ 175], 20.00th=[ 189],
| 30.00th=[ 201], 40.00th=[ 211], 50.00th=[ 221], 60.00th=[ 231],
| 70.00th=[ 241], 80.00th=[ 251], 90.00th=[ 266], 95.00th=[ 282],
| 99.00th=[ 310], 99.50th=[ 326], 99.90th=[ 362], 99.95th=[ 386],
| 99.99th=[ 466]
bw (KB /s): min= 4, max=225344, per=99.17%, avg=217851.37, stdev=20237.94
lat (usec) : 4=0.01%, 10=0.01%, 50=0.01%, 100=0.01%, 250=78.56%
lat (usec) : 500=21.42%, 750=0.01%, 1000=0.01%
lat (msec) : 4=0.01%, 10=0.01%, 20=0.01%
cpu : usr=8.22%, sys=28.38%, ctx=0, majf=0, minf=0
IO depths : 1=0.1%, 2=0.2%, 4=68.4%, 8=37.6%, 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=99.5%, 8=0.5%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
issued : total=r=1647553/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
latency : target=0, window=0, percentile=100.00%, depth=8
Run status group 0 (all jobs):
READ: io=12872MB, aggrb=219671KB/s, minb=219671KB/s, maxb=219671KB/s, mint=60001msec, maxt=60001msec
#
Regards,
Thierry--
To unsubscribe from this list: send the line "unsubscribe fio" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
