Re: [GridSim-users] how create machines during the simulation

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Hi Gilberto,

Gilberto Cunha escribió:
> Hi! Agustín and Marcos.
>
> Thank you for your suggestions.
>
> I'm looking at them carefully. Initially i would' like use the 
> resource failure functionality and set resources initially as failed 
> as you wrote.
>
> But i' don't understand very well what's means some parameters about 
> the constructor parameters of class HyperExponential.
>
> |*HyperExponential 
> <http://www.gridbus.org/gridsim/doc/api/gridsim/util/HyperExponential.html#HyperExponential%28double,%20double,%20int%29>*(double mu, 
> double sigma, int i)|
>
>     * What's means the parameter "i" ?
>
>
>     * and If I want simulate 40% (80 resources) of resources intially
>       failed,  and during the simulation join 2,5% (5 resources is the
>       same of one machine with one PE) following the distribuition and
>       fail more 2,5% of resources available.  I have a set of 200
>       GridResources, where each resource is just one machine with one
>       PE. For example, what's values I should use.
>
The hyperexponential distribution is used just to make a randomized 
selection of failed resources, failure length, and failure start time. 
So, if u want to make such a concrete simulation (without randomized 
stuff regarding the number of failed resources), what u should do is 
remove the  use of that distribution for that purpose, and manually set 
the number of failed resources, failures times and so on.

In order to do this, u have to modify the code of the 
RegionalGISWithFailure class, so that u set  80 resources initially 
failed. Then, u set the recovery of 5 of those resources (the time of 
the recovery can be chosen by a distribution). Later, u must set another 
5 resources as failed (when they fail can be chosen at random).

To do this, u have to modify processGridResource_Failure function:

1- Set 80 resources initially as failed: Step 4 in Fig 3 in the first 
document mentioned below. Send a GRIDRESOIURCE_FAILURE event to those 80 
resources. The getNextFailureLengthSample() function should return a 
finite duration for 5 of those resources (since they will recover during 
sims), so u may probably need to modify this function. For the other 75 
resources that will not recover, the duration of the failure should be 
infinite.

2- For the 5 resources initially working that fail during sims, u must 
manually set the number of resources that fail, and choose the moment 
and length of the failure.

U will find an explanation of the way how the failure functionality 
works here:

http://www.dsi.uclm.es/descargas/thecnicalreports/DIAB-07-01-1/DIAB-07-01-1.pdf 
http://www.gridbus.org/papers/gridsim-failure-detection-icpads2007.pdf

Take a look into the processGridResource_Failure function and tell em if 
u keep having doubts.

All the best,

Agustin

> Thanks and Regards,
>
> Gilberto Cunha
>
>
>
>
>
> On Wed, Jun 11, 2008 at 7:16 AM, Marcos Dias de Assuncao 
> <ma...@cs... <mailto:ma...@cs...>> wrote:
>
>
>     Dear Gilberto,
>
>     In theory you could create a GridResource dynamically during the
>     simulation in the same way that you create GridResources before
>     the simulation starts. One entity could, for example, create a
>     resource with the required characteristics. The constructors of
>     the Sim_entity class call Sim_system.add(this) to include the just
>     created entity to the list of entities created. The method  add of
>     sim_system is as follows:
>
>      /**
>       * Add a new entity to the simulation. This is present for
>     compatibility with existing
>       * simulations since entities are automatically added to the
>     simulation upon instantiation.
>       * @param e The new entity
>       */
>      public static void add(Sim_entity e) {
>        Sim_event evt;
>        if (running) {
>          // Post an event to make this entity
>          evt = new
>     Sim_event(Sim_event.CREATE,clock,current_ent().get_id(),0,0, e);
>          future.add_event(evt);
>        } else {
>          if (e.get_id()==-1) { // Only add once!
>            e.set_id(entities.size());
>            entities.add(e);
>          }
>        }
>      }
>
>     Basically, if the simulation is running, it will schedule one
>     event, which is handled by Sim_system itself in a private method.
>
>     Everything looks fine. However, in practice SimJava has a bug
>     because future.add_event(evt); may raise an exception as it is not
>     synchronised and the list called future (containing the future
>     simulation events) may be changed simultaneously by two entities.
>     I had concurrent modification problems with the auction framework
>     when adding entities at runtime. It is actually simple to solve
>     it, but it requires one to change SimJava.
>
>     Regards,
>
>     Marcos
>
>
>
>     On 11/06/2008, at 5:28 PM, Agustín Caminero Herráez wrote:
>
>         Hello,
>
>         I don't think u can create gridResources dynamically during
>         simulations.
>
>         What u can do instead is use the resource failure
>         functionality and set resources initially as failed, then make
>         them available as sim progresses.
>
>         This way u would simulate the dynamic creation of GridResources.
>
>         Regards,
>
>         Agustin
>
>
>         Gilberto Cunha escribió:
>
>
>             Hello,
>
>             I have a question regarding GridResource.
>             My doubt is as follows:
>
>             How can i create GridResources during the simulation, in a
>             dynamic way?
>
>             Regards,
>             -- 
>             Gilberto Cunha Filho
>             gil...@gm... <mailto:gil...@gm...>
>             <mailto:gil...@gm...
>             <mailto:gil...@gm...>>
>             SISMO - Laboratório de Sistemas e Mobilidade
>             UFMA
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>         -- 
>         ===============================================
>         Agustin Caminero
>         PhD Student
>         Computing Systems Department
>         The University of Castilla La Mancha, Albacete. Spain.
>         Phone: +34 967 599 200 Ext. 2693. Fax: +34 967 599 343
>         http://www.i3a.uclm.es/
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>
>
> -- 
> Gilberto Cunha Filho
> gil...@gm... <mailto:gil...@gm...>
> SISMO - Laboratório de Sistemas e Mobilidade
> UFMA 

-- 
===============================================
Agustin Caminero
PhD Student
Computing Systems Department
The University of Castilla La Mancha, Albacete. Spain.
Phone: +34 967 599 200 Ext. 2693. Fax: +34 967 599 343
http://www.i3a.uclm.es/
===============================================