Re: fio usage question

[John OCallaghan <john.ocallaghan@s3group.com>]

Thanks David, am not using verify but am curious how this can get affected.

Would it be that job configs that use the same file names would clobber
one anothers data on disk? I could see how that would be an issue for
multi process fio instances alright.




On 18/08/14 16:38, David Nellans wrote:
> On 08/18/2014 10:03 AM, John OCallaghan wrote:
>>
>> Hi All
>>
>> A question on usage of fio. I would like to be able to spin up more than
>> one fio instance running on the same platform concurrently.
>>
>> For example, I would like to run one fio instance in time_based mode
>> doing some stuff. And after a fixed period of time then start a non-time
>> based fio instance doing some other stuff.
>>
>> I have tried it out and to my untrained eyes it looks like its going OK.
>> But I'd love to hear from others with more experience in this area. Is
>> this something that is recommended?
>>
>> Will my data skew in some way because fio expects there to be only one
>> instance of itself playing at any one time?
>>
>> Any advice would be much appreciated!
>>
> Different processes shouldn't run into any issues unless you're doing a
> job with
> verification in which case you'll end up with verify errors due to jobs
> overwriting each
> other's data.
> 
> Unless you want to use multiple processes for some reason versus jobs
> inside a single
> process - you can delay one of your multiple jobs starting using the
> startdelay=N
> parameter in the jobfile.
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