[Disksim-users] Fwd: How to Fix the Saturation Error Due to Heavy Workload!

[Alireza Haghdoost]

As Prof. Ganger said your workload is very heavy. In other words, the trace
file issue IO request very fast, i.e faster than a real system.  You may
double check the unit (s, ms) of the time in your traces. Also you can scale
requests time with in a parameter in disksim parv file. Please refer to
disksim manual for this time scaling parameter.

Alireza Haghdoost
Graduate Student
Department of Computer Engineering
Sharif University of Technology
http://ce.sharif.edu/~haghdoost
Phone: (98) (21) 6616 6689




2011/2/9 Peyman Behzadnia <pbehzadn at mail.usf.edu>

> Thanks Greg.
>
> I appreciate if someone has an idea about parameters&configurations to fix
> this error? Has anybody had a similiar situatio before?
>
> Best,
> Peyman
>
> ---------- Forwarded message ----------
> From: Greg Ganger <ganger at ece.cmu.edu>
> Date: Tue, Feb 8, 2011 at 7:42 PM
> Subject: Re: [Disksim-users] How to Fix the Saturation Error Due to Heavy
> Workload!
> To: Peyman Behzadnia <pbehzadn at mail.usf.edu>
> Cc: Greg Ganger <ganger at ece.cmu.edu>
>
>
>
> No, I'm sorry, but I can't know that.  Look at the throughput you see
> with less intense worklaods to project what it is capable of doing.
>
>
> Good luck,
>
> Greg
>
>
> On Tue, 8 Feb 2011, Peyman Behzadnia wrote:
>
> Dear Greg,
>>
>> Thanks for your comment.
>> Can you please let me know how to increase the tolerance of the simulated
>> system through configurations and parameters? My system includes 10 disks
>> each connected to one bus and one controller and these are connected to
>> one
>> higher level bus, controller and finally the driver.
>>
>> Thanks
>> Peyman
>>
>>
>> On Tue, Feb 8, 2011 at 7:30 PM, Greg Ganger <ganger at ece.cmu.edu> wrote:
>>
>>
>>> The saturation error happens because the workload is heavier than the
>>> simualted storage system can handle... not because the simulator itself
>>> can't keep up.
>>>
>>> Good luck,
>>>
>>> Greg
>>>
>>>
>>>
>>> On Tue, 8 Feb 2011, Peyman Behzadnia wrote:
>>>
>>> Dear All,
>>>
>>>>
>>>> This is Peyman Behzadnia, a PhD student in Computer Science &
>>>> Engineering.
>>>> I'm contacting you guys regarding the 'Saturation Error' of the disksim.
>>>>
>>>> I've run a simulation on top of the disksim4 in which i have to feed the
>>>> simulator with my ascii-format workload with high intensity (100-700
>>>> requests per second). The problem is that the disksim has constantly
>>>> given
>>>> the saturation error: the simulation stopped due to saturation. I have
>>>> re-checked all of the detailed parameters in my parameter file and also
>>>> have
>>>> tested my workload with the sample parameter files provided by the
>>>> disksim.
>>>> But, it gives the same error. When i decrease the intensity into 1
>>>> request
>>>> per 1-2seconds, it works well.
>>>> I personally do not believe that such disk simulator can not even handle
>>>> 20
>>>> requests per second. It might be something about a configuration. I
>>>> appreciate if somebody can give me a hint or comment about how to fix
>>>> this
>>>> saturation error.
>>>>
>>>> Best,
>>>> Peyman
>>>>
>>>>
>>>>
>>
>
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