Re: [GridSim-developers] How GridResource "real" process gridlets? Is it possible to get the workload of resource?

[ye h. <hua...@gm...>]

Hi, Marcos:
Thanks a lot for kindly help and useful information.

I was messed up while searching for method inside GridResource class.

In this context, Does it mean I am able to get information such as  
queued jobs (e.g. gridletQueueList_),  job in processing (e.g.  
gridletInExecList_), total resource load (e.g. calculateTotalLoad) by  
asking for AllocPolicy series, instead of GridResource itself?

I have one more question as follows:
what is the result of "forecastFinishTime" if all the PEs of a  
resource is currently busy with something else? For example, a  
submitted job requests 2 PE for 1000 seconds, if the resource is only  
able to provide two free PEs in future 500 seconds, will the policy  
put the expected finish time "1500" to the job immediately, or keep  
the job in queue for 500 seconds and calculate the expected finish  
time "1000" later? Or I should implement it myself?

regards
ye

On Sep 29, 2008, at 1:36 AM, Marcos Dias de Assuncao wrote:

>
> Hi Ye,
>
> The gridlet is not returned as soon as it arrives at the resource.  
> The only thing that is returned as soon as the gridlet arrives is an  
> ack., if the user requested it. The gridlet is returned to the user  
> after its processing is complete. The processing time is calculated  
> based on the gridlet's number of MIs and the resource's MIPS  
> capability. The allocation policies schedule internal events (i.e.  
> events sent to themselves) to know when a job completes. See for  
> example the method allocatePEtoGridlet(ResGridlet rgl) of  
> SpaceShared. After the execution time is calculated, the method  
> sends an event to the policy itself, which will be handled at the  
> event's time (i.e. this event is the job's completion):
>
> // Identify Completion Time and Set Interrupt
> int rating = machineRating_[ rgl.getMachineID() ];
> double time = forecastFinishTime( rating ,
>                            rgl.getRemainingGridletLength() );
>
> int roundUpTime = (int) (time+1);   // rounding up
> rgl.setFinishTime(roundUpTime);
>
> // then send this into itself
> super.sendInternalEvent(roundUpTime);
> return true;
>
> Regards,
>
> Marcos
>
> On 29/09/2008, at 2:41 AM, ye huang wrote:
>
>> Hi, all:
>> Is there anyone could help to explain the job executing process of a
>> GridResource?
>> If I understand right, once the GridResource receives submitted jobs
>> via "processGridletSubmit", it only calculates the cost for  
>> processing
>> the gridlet, and send the gridlet back. That means, the GridResource
>> won't wait a while for "real job processing".
>>
>> If I am right, is it possible to trace the resource's workload? I
>> mean, once a resource received a lot of gridlets, since each gridlet
>> needs some time for its execution, is it possible to simulate the
>> "busy status" of a resource? For example, the resource will be wait
>> for while to process the next gridlet request? Further more, could  
>> the
>> users be able to get the workload of a resource?
>>
>> regards
>> ye
>>
>> --
>>
>> Ye Huang, Department of Informatics
>> University of Fribourg / Pérolles 2 - Bld de Pérolles 90
>> 1700 Fribourg, Switzerland
>>
>> e-mail: ye....@he...,  ye....@un...
>> http://diuf.unifr.ch/people/huangy/
>> Office: +41 26 429 65 95
>>
>>
>>
>>
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>
> Marcos Dias de Assuncao
> Grid Computing and Distributed Systems (GRIDS) Laboratory
> Department of Computer Science and Software Engineering
> The University of Melbourne, Australia
> Email: ma...@cs...
>
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--

Ye Huang, Department of Informatics
University of Fribourg / Pérolles 2 - Bld de Pérolles 90
1700 Fribourg, Switzerland

e-mail: ye....@he...,  ye....@un...
http://diuf.unifr.ch/people/huangy/
Office: +41 26 429 65 95