On Thu, Mar 12, 2015 at 7:32 AM, Urs Schaltegger
<urs.schaltegger@xxxxxxxxxxxx> wrote:
> fio always writes null bytes whatever I do. I need random data to avoid interference of deduplication solutions (within SSDs or using ZFS).
>
> Windows 8.1 Enterprise x64
>
> fio-2.2.6 (also tried 2.2.0/2.2.1/2.2.3)
>
> fio --section=fiorandom --runtime=60 <FIOFile>
>
> <FIOFile>:
>
> [global]
> ioengine=windowsaio
> thread
> group_reporting
> time_based
> clocksource=clock_gettime
> direct=1
> refill_buffers
> size=1g
> [fiorandom]
> readwrite=randwrite
> numjobs=4
> iodepth=1
> blocksize=8k
> directory=D\:\
Confirmed here as well...
matt@matt-work:~$ fio --name=test --filename=/tmp/fio.temp.file
--size=1g --rw=write --refill_buffers
test: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=sync, iodepth=1
fio-2.2.6
Starting 1 process
test: Laying out IO file(s) (1 file(s) / 1024MB)
Jobs: 1 (f=1): [W(1)] [-.-% done] [0KB/289.7MB/0KB /s] [0/74.0K/0
iops] [eta 00m:00s]
test: (groupid=0, jobs=1): err= 0: pid=7629: Thu Mar 12 14:02:39 2015
write: io=1024.0MB, bw=537456KB/s, iops=134363, runt= 1951msec
clat (usec): min=1, max=7014, avg= 7.03, stdev=198.60
lat (usec): min=1, max=7014, avg= 7.07, stdev=198.60
clat percentiles (usec):
| 1.00th=[ 1], 5.00th=[ 1], 10.00th=[ 1], 20.00th=[ 1],
| 30.00th=[ 1], 40.00th=[ 1], 50.00th=[ 1], 60.00th=[ 1],
| 70.00th=[ 2], 80.00th=[ 2], 90.00th=[ 2], 95.00th=[ 2],
| 99.00th=[ 3], 99.50th=[ 4], 99.90th=[ 19], 99.95th=[ 6944],
| 99.99th=[ 6944]
bw (KB /s): min=294634, max=1233526, per=100.00%, avg=608053.33,
stdev=541675.65
lat (usec) : 2=69.53%, 4=29.89%, 10=0.35%, 20=0.14%, 50=0.01%
lat (msec) : 10=0.08%
cpu : usr=5.33%, sys=18.45%, ctx=222, majf=0, minf=8
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=262144/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=1
Run status group 0 (all jobs):
WRITE: io=1024.0MB, aggrb=537455KB/s, minb=537455KB/s,
maxb=537455KB/s, mint=1951msec, maxt=1951msec
Disk stats (read/write):
sda: ios=0/897, merge=0/7, ticks=0/230372, in_queue=250416, util=87.64%
matt@matt-work:~$ hexdump /tmp/fio.temp.file
0000000 0000 0000 0000 0000 0000 0000 0000 0000
*
40000000
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