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

[Marcos D. de A. <ma...@cs...>]

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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