hi Jeff,
iodepth doesn't seem to make difference - see output (this is with two
raid array)
devices: (g=0): rw=write, bs=1M-1M/1M-1M/1M-1M, ioengine=libaio, iodepth=32
fio-2.1.7
Starting 1 process
Jobs: 1 (f=1): [W] [100.0% done] [0KB/1227MB/0KB /s] [0/1227/0 iops]
[eta 00m:00s]
devices: (groupid=0, jobs=1): err= 0: pid=91658: Thu Jul 3 14:20:42 2014
write: io=41368MB, bw=1376.7MB/s, iops=1376, runt= 30050msec
slat (usec): min=104, max=8419, avg=328.49, stdev=63.54
clat (usec): min=4, max=114758, avg=22883.96, stdev=8585.56
lat (msec): min=2, max=115, avg=23.21, stdev= 8.58
clat percentiles (msec):
| 1.00th=[ 11], 5.00th=[ 12], 10.00th=[ 12], 20.00th=[ 21],
| 30.00th=[ 23], 40.00th=[ 23], 50.00th=[ 23], 60.00th=[ 25],
| 70.00th=[ 25], 80.00th=[ 26], 90.00th=[ 28], 95.00th=[ 35],
| 99.00th=[ 61], 99.50th=[ 68], 99.90th=[ 80], 99.95th=[ 89],
| 99.99th=[ 110]
bw (MB /s): min= 926, max= 2790, per=100.00%, avg=1376.74, stdev=420.52
lat (usec) : 10=0.01%
lat (msec) : 4=0.03%, 10=0.39%, 20=19.28%, 50=78.27%, 100=1.99%
lat (msec) : 250=0.04%
cpu : usr=30.09%, sys=17.91%, ctx=19628, majf=0, minf=26
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=99.9%, >=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=0.1%, 64=0.0%, >=64=0.0%
issued : total=r=0/w=41368/d=0, short=r=0/w=0/d=0
latency : target=0, window=0, percentile=100.00%, depth=32
Run status group 0 (all jobs):
WRITE: io=41368MB, aggrb=1376.7MB/s, minb=1376.7MB/s,
maxb=1376.7MB/s, mint=30050msec, maxt=30050msec
On Thu, Jul 3, 2014 at 2:12 PM, Jeff Moyer <[email protected]> wrote:
> "Yuyang (Alex) Wang" <[email protected]> writes:
>
>> Jens, thanks for the reply.
>>
>> I also tried the following as the HOWTO suggested, and getting similar
>> results
>> [devices]
>> filename=/dev/mapper/raid0:/dev/mapper/raid1
>>
>>
>> This may be silly part on me misreading the manual, what's correct way
>> of specifying multiple devices?
>
> That looks ok to me. What happens if you double your queue depth?
>
> Cheers,
> Jeff
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