--thinktime seems not work

--thinktime seems not work

[Rodrigo Ribeiro Gomes]

HI guys!

I'm trying use the --thinktime parameter to sleep between each io
request for ten seconds.

But, it seems not working... I'm doing  something incorrect?

fio --name disktst  ... --thinktime 10000000

In HOWTO, this param is described as 'Stall the job x microseconds'...
But fio dont stop between each request and continues issuing. This is
complete command line that i used:


fio --name IoRequestDelayTest --directory J\:\  --iodepth 1 --bs 4k
--size 1G --io_size 1G --direct 1 --thread --runtime 1h --time_based
--rw randread --thinktime 10000000

The J: is mounted on a USB flash drive (Kingston SE9 32GB)

-- 

[]'s Rodrigo Ribeiro Gomes
MCITP: Database Administrator 2008
MCITP: Database Developer 2008

061 8106-2710
(Acesse o blog THE SQL TIMES | http://www.thesqltimes.com)

Re: --thinktime seems not work

[Jens Axboe]

On 05/13/2015 10:23 AM, Rodrigo Ribeiro Gomes wrote:
> HI guys!
>
> I'm trying use the --thinktime parameter to sleep between each io
> request for ten seconds.
>
> But, it seems not working... I'm doing  something incorrect?
>
> fio --name disktst  ... --thinktime 10000000
>
> In HOWTO, this param is described as 'Stall the job x microseconds'...
> But fio dont stop between each request and continues issuing. This is
> complete command line that i used:
>
>
> fio --name IoRequestDelayTest --directory J\:\  --iodepth 1 --bs 4k
> --size 1G --io_size 1G --direct 1 --thread --runtime 1h --time_based
> --rw randread --thinktime 10000000
>
> The J: is mounted on a USB flash drive (Kingston SE9 32GB)

Works fine for me:

./fio --name=think --size=1g --bs=4k --rw=randread --direct=1
[...]
   read : io=130244KB, bw=30114KB/s, iops=7528, runt=  4325msec

./fio --name=think --size=1g --bs=4k --rw=randread --direct=1 
--thinktime=1000
[...]
   read : io=17668KB, bw=3340.6KB/s, iops=835, runt=  5289msec

I tried your 10s as well, works too.

-- 
Jens Axboe

Re: --thinktime seems not work

[Rodrigo Ribeiro Gomes]

Interesting. It Windows version?

On Wed, May 13, 2015 at 11:33 AM, Jens Axboe <axboe@kernel.dk> wrote:
> On 05/13/2015 10:23 AM, Rodrigo Ribeiro Gomes wrote:
>>
>> HI guys!
>>
>> I'm trying use the --thinktime parameter to sleep between each io
>> request for ten seconds.
>>
>> But, it seems not working... I'm doing  something incorrect?
>>
>> fio --name disktst  ... --thinktime 10000000
>>
>> In HOWTO, this param is described as 'Stall the job x microseconds'...
>> But fio dont stop between each request and continues issuing. This is
>> complete command line that i used:
>>
>>
>> fio --name IoRequestDelayTest --directory J\:\  --iodepth 1 --bs 4k
>> --size 1G --io_size 1G --direct 1 --thread --runtime 1h --time_based
>> --rw randread --thinktime 10000000
>>
>> The J: is mounted on a USB flash drive (Kingston SE9 32GB)
>
>
> Works fine for me:
>
> ./fio --name=think --size=1g --bs=4k --rw=randread --direct=1
> [...]
>   read : io=130244KB, bw=30114KB/s, iops=7528, runt=  4325msec
>
> ./fio --name=think --size=1g --bs=4k --rw=randread --direct=1
> --thinktime=1000
> [...]
>   read : io=17668KB, bw=3340.6KB/s, iops=835, runt=  5289msec
>
> I tried your 10s as well, works too.
>
> --
> Jens Axboe
>



-- 

[]'s Rodrigo Ribeiro Gomes
MCITP: Database Administrator 2008
MCITP: Database Developer 2008

061 8106-2710
(Acesse o blog THE SQL TIMES | http://www.thesqltimes.com)

Re: --thinktime seems not work

[Jens Axboe]

On 05/13/2015 10:37 AM, Rodrigo Ribeiro Gomes wrote:
>
> On Wed, May 13, 2015 at 11:33 AM, Jens Axboe <axboe@kernel.dk> wrote:
>> On 05/13/2015 10:23 AM, Rodrigo Ribeiro Gomes wrote:
>>>
>>> HI guys!
>>>
>>> I'm trying use the --thinktime parameter to sleep between each io
>>> request for ten seconds.
>>>
>>> But, it seems not working... I'm doing  something incorrect?
>>>
>>> fio --name disktst  ... --thinktime 10000000
>>>
>>> In HOWTO, this param is described as 'Stall the job x microseconds'...
>>> But fio dont stop between each request and continues issuing. This is
>>> complete command line that i used:
>>>
>>>
>>> fio --name IoRequestDelayTest --directory J\:\  --iodepth 1 --bs 4k
>>> --size 1G --io_size 1G --direct 1 --thread --runtime 1h --time_based
>>> --rw randread --thinktime 10000000
>>>
>>> The J: is mounted on a USB flash drive (Kingston SE9 32GB)
>>
>>
>> Works fine for me:
>>
>> ./fio --name=think --size=1g --bs=4k --rw=randread --direct=1
>> [...]
>>    read : io=130244KB, bw=30114KB/s, iops=7528, runt=  4325msec
>>
>> ./fio --name=think --size=1g --bs=4k --rw=randread --direct=1
>> --thinktime=1000
>> [...]
>>    read : io=17668KB, bw=3340.6KB/s, iops=835, runt=  5289msec
>>
>> I tried your 10s as well, works too.
 >
 > Interesting. It Windows version?

(please don't top post!)

It's possible, the Windows part does have its own nanosleep() function, 
which fio calls for this part. That's the only OS dependent bit in this 
equation.

Bruce?

-- 
Jens Axboe

Re: --thinktime seems not work

[Rodrigo Ribeiro Gomes]

I did some new test and removed the parameters '--runtime' and
'--time_based' .... Without it, the thinktime works!
(sorry for top post)

Re: --thinktime seems not work

[Jens Axboe]

On 05/13/2015 11:33 AM, Rodrigo Ribeiro Gomes wrote:
> I did some new test and removed the parameters '--runtime' and
> '--time_based' .... Without it, the thinktime works!
> (sorry for top post)

Neither of those should have any impact on the thinktime. Doesn't 
reproduce for me. What version of fio are you using?

-- 
Jens Axboe

Re: --thinktime seems not work

[Bruce Cran]

On 5/13/2015 9:11 AM, Jens Axboe wrote:
>
> It's possible, the Windows part does have its own nanosleep() 
> function, which fio calls for this part. That's the only OS dependent 
> bit in this equation.
>
> Bruce?
>

Well, on Windows the nanosleep() function appears to be working with the 
latest fio code, so I'm not sure what might be going wrong.

-- 
Bruce

Re: --thinktime seems not work

[Jens Axboe]

On 05/13/2015 07:01 PM, Bruce Cran wrote:
> On 5/13/2015 9:11 AM, Jens Axboe wrote:
>>
>> It's possible, the Windows part does have its own nanosleep()
>> function, which fio calls for this part. That's the only OS dependent
>> bit in this equation.
>>
>> Bruce?
>>
>
> Well, on Windows the nanosleep() function appears to be working with the
> latest fio code, so I'm not sure what might be going wrong.

I did read the code, and it looked OK to me. So ditto, no real idea on 
what is going on here. Rodrigo, are you using a 32-bit build? Maybe the 
ints overflow. Does it work if you use smaller delays, the 10s delay per 
IO is pretty massive.

-- 
Jens Axboe

--thinktime seems not work

[rodrigo]

HI guys!

I'm trying use the --thinktime parameter to sleep between each io
request for ten seconds.

But, it seems not working... I'm doing  something incorrect?

fio --name disktst  ... --thinktime 10000000

In HOWTO, this param is described as 'Stall the job x microseconds'...
But fio dont stop between each request and continues issuing. This is
complete command line that i used:


fio --name IoRequestDelayTest --directory J\:\  --iodepth 1 --bs 4k
--size 1G --io_size 1G --direct 1 --thread --runtime 1h --time_based
--rw randread --thinktime 10000000

The J: is mounted on a USB flash drive (Kingston SE9 32GB)