Re: Test files being created twice as large as requested (Win7)

[Jens Axboe <axboe@kernel.dk>]

On 08/17/2012 01:24 PM, Greg Sullivan wrote:
> On 17 August 2012 16:28, Jens Axboe <axboe@kernel.dk> wrote:
>> On 08/16/2012 05:34 AM, Greg Sullivan wrote:
>>> fio seems to be creating test files that are twice as large as
>>> requested. The following config creates a file that is 209,715,200
>>> bytes in size:
>>>
>>> [read]
>>> size=100M
>>> rw=read
>>>
>>> Environment: Windows 7 32-bit, fio 2.0.8
>>
>> Can you post the output of running that job? Ensure that the read.1.0 is
>> deleted before running it.
>>
>> --
>> Jens Axboe
> 
> Here is the log:
> ===BEGIN===
> C:\test>dir
>  Volume in drive C has no label.
>  Volume Serial Number is 08F2-7A32
> 
>  Directory of C:\test
> 
> 17/08/2012  09:23 PM    <DIR>          .
> 17/08/2012  09:23 PM    <DIR>          ..
> 17/08/2012  09:16 PM                26 test.ini
>                1 File(s)             26 bytes
>                2 Dir(s)  130,065,698,816 bytes free
> 
> C:\test>fio test.ini
> fio: this platform does not support process shared mutexes, forcing use of threa
> ds. Use the 'thread' option to get rid of this warning.
> read: (g=0): rw=read, bs=4K-4K/4K-4K, ioengine=windowsaio, iodepth=1
> fio-2.0.8-18-g525f
> Starting 1 process
> read: Laying out IO file(s) (1 file(s) / 100MB)
> Jobs: 1 (f=1)
> read: (groupid=0, jobs=1): err= 0: pid=7568: Fri Aug 17 21:23:34 2012
>   read : io=102400KB, bw=71309KB/s, iops=17827 , runt=  1436msec
>     slat (usec): min=11 , max=10187 , avg=20.98, stdev=72.27
>     clat (usec): min=1 , max=5422 , avg=28.49, stdev=57.96
>      lat (usec): min=13 , max=11875 , avg=49.47, stdev=110.30
>     clat percentiles (usec):
>      |  1.00th=[    2],  5.00th=[    4], 10.00th=[    7], 20.00th=[   22],
>      | 30.00th=[   24], 40.00th=[   24], 50.00th=[   25], 60.00th=[   29],
>      | 70.00th=[   30], 80.00th=[   41], 90.00th=[   42], 95.00th=[   42],
>      | 99.00th=[   49], 99.50th=[  112], 99.90th=[  378], 99.95th=[  876],
>      | 99.99th=[ 2576]
>     bw (KB/s)  : min=46816, max=78288, per=87.72%, avg=62552.00, stdev=22254.06
>     lat (usec) : 2=0.05%, 4=4.83%, 10=6.11%, 20=7.66%, 50=80.36%
>     lat (usec) : 100=0.41%, 250=0.41%, 500=0.11%, 750=0.01%, 1000=0.02%
>     lat (msec) : 2=0.02%, 4=0.01%, 10=0.01%
>   cpu          : usr=0.00%, sys=69.69%, ctx=0, majf=0, minf=0
>   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=25600/w=0/d=0, short=r=0/w=0/d=0
> 
> Run status group 0 (all jobs):
>    READ: io=102400KB, aggrb=71309KB/s, minb=71309KB/s, maxb=71309KB/s, mint=1436
> msec, maxt=1436msec
> 
> C:\test>dir
>  Volume in drive C has no label.
>  Volume Serial Number is 08F2-7A32
> 
>  Directory of C:\test
> 
> 17/08/2012  09:23 PM    <DIR>          .
> 17/08/2012  09:23 PM    <DIR>          ..
> 17/08/2012  09:23 PM       209,715,200 read.1.0
> 17/08/2012  09:16 PM                26 test.ini
>                2 File(s)    209,715,226 bytes
>                2 Dir(s)  129,855,209,472 bytes free
> 

Huh, that's all very odd. Bruce, can you reproduce this?

-- 
Jens Axboe