Hi everybody,
I'am using fio in a vmware virtualized environment. I have got a guest
virtual machine based on centos5.2 on which I run fio in order to
measure the virtual disks IO performances.
I use the "write_bw_log" parameter in order to build graphs for the
experiments but the problem is that the file generated by fio for each
job is empty (size = 0).
However, i also use "write_clat_log" parameter and the 'clat.log' and
'slat.log' files are not empty. The mean bandwidth in the fio output
summary seams to be good.
By the way, this problem only happen with write workloads either write
or randwrite.
Here is the fio config file I used:
===================
[global]
thread
ioengine=libaio
write_bw_log
write_lat_log
[/dev/sdc]
name=job0
rw=write
bs=4096k
iodepth=1
direct=1
runtime=60
===================
And the fio stdout was:
===================
job0: (g=0): rw=write, bs=4M-4M/4M-4M, ioengine=libaio, iodepth=1
Starting 1 thread
job0: (groupid=0, jobs=1): err= 0: pid=4063
write: io=996MiB, bw=16,967KiB/s, iops=4, runt= 60111msec
slat (usec): min=3,204, max=6,461, avg=3659.85, stdev=525.91
clat (msec): min=94, max=4,236, avg=237.72, stdev=335.46
cpu : usr=0.00%, sys=1.54%, ctx=5616, majf=0, minf=249
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=0/249, short=0/0
lat (msec): 100=0.40%, 250=81.93%, 500=16.87%, >=2000=0.80%
Run status group 0 (all jobs):
WRITE: io=996MiB, aggrb=16,967KiB/s, minb=16,967KiB/s,
maxb=16,967KiB/s, mint=60111msec, maxt=60111msec
Disk stats (read/write):
sdc: ios=0/1990, merge=0/0, ticks=0/371851, in_queue=372233, util=99.67%
===================
The logs job0_bw.log, job0_clat.log and job0_slat.log are in the
attachement.
Did someone already have such a problem? If so, is there a workaround or
a patch to correct it?
Regards.
Ivan Frain
--
*Seanodes*
Bâtiment Platon
25 boulevard Victor Hugo
31770 Colomiers
tél : 05.62.12.00.19
http://www.seanodes.com
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