On Thu, Apr 23, 2015 at 3:05 PM, Nick Fisk <nick@xxxxxxxxxx> wrote:
> I have had a look through the fio runs, could you also try and run a couple
> of jobs with iodepth=64 instead of numjobs=64. I know they should do the
> same thing, but the numbers with the former are easier to understand.
Maybe it's an issue of interpretation, but this doesn't actually seem to work:
testfile: (g=0): rw=randwrite, bs=128K-128K/128K-128K/128K-128K,
ioengine=sync, iodepth=64
fio-2.1.3
Starting 1 process
testfile: (groupid=0, jobs=1): err= 0: pid=5967: Thu Apr 23 19:40:14 2015
write: io=5762.7MB, bw=3278.3KB/s, iops=25, runt=1800048msec
clat (msec): min=5, max=807, avg=39.03, stdev=59.24
lat (msec): min=5, max=807, avg=39.04, stdev=59.24
clat percentiles (msec):
| 1.00th=[ 6], 5.00th=[ 7], 10.00th=[ 7], 20.00th=[ 8],
| 30.00th=[ 10], 40.00th=[ 13], 50.00th=[ 19], 60.00th=[ 27],
| 70.00th=[ 37], 80.00th=[ 50], 90.00th=[ 92], 95.00th=[ 149],
| 99.00th=[ 306], 99.50th=[ 416], 99.90th=[ 545], 99.95th=[ 586],
| 99.99th=[ 725]
bw (KB /s): min= 214, max=12142, per=100.00%, avg=3352.50, stdev=1595.13
lat (msec) : 10=32.27%, 20=19.42%, 50=28.25%, 100=10.94%, 250=7.67%
lat (msec) : 500=1.25%, 750=0.20%, 1000=0.01%
cpu : usr=0.06%, sys=0.18%, ctx=46686, majf=0, minf=29
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 : total=r=0/w=46101/d=0, short=r=0/w=0/d=0
Run status group 0 (all jobs):
WRITE: io=5762.7MB, aggrb=3278KB/s, minb=3278KB/s, maxb=3278KB/s,
mint=1800048msec, maxt=1800048msec
Disk stats (read/write):
vdb: ios=0/46809, merge=0/355, ticks=0/1837916, in_queue=1837916, util=99.95%
It's like it didn't honor the setting. (And whew, 25 iops & 3M/sec, ouch.)
Thanks!
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