Re: [GridSim-developers] Extending GridSim Reg-JR

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

Hi,
Actually, I think the problem also exists upon gridsim itself (or i  
haven't understood it well so far).

I encountered a similar problem by extend the Example code of gridsim  
itself, which i had also submitted to the maillist. Unfortunately, no  
one replied that last time. The following is the details:

--- ---- [start] --------------
However, I find another confusing "bug", it's about the way of  
receiving gridlet sent back from resources. Here i am going to explain  
it using a demo from GridSim's official example file: Example 04:

Starting from line 109 of Example 04, submitting and receiving  
gridlets are finished in one loop as follows:
--- code snippet 1 ---

for (int i = 0; i < this.list_.size(); i++)
{
     gridlet = (Gridlet) this.list_.get(i);
     info = "Gridlet_" + gridlet.getGridletID();

     super.gridletSubmit(gridlet, resourceID);

     gridlet = super.gridletReceive();
     this.receiveList_.add(gridlet);
}

In my scenario, in order the decouple the behavior, I split the  
procedure into two parts as follows:

--- code snippet 2 ---

// part 1: submit gridlet
for (int i = 0; i < this.list_.size(); i++)
{
     gridlet = (Gridlet) this.list_.get(i);
     info = "Gridlet_" + gridlet.getGridletID();

    super.send(resourceID, GridSimTags.SCHEDULE_NOW,
                   GridSimTags.GRIDLET_SUBMIT, gridlet);

}

// part 2: receive gridlet from gridresource
Sim_event ev = new Sim_event();
while (Sim_system.running()) {
     super.sim_get_next(ev);

	if (ev.get_tag() == GridSimTags.GRIDLET_RETURN){
		gridlet = (Gridlet) ev.get_data();

         // stores the received Gridlet into a new GridletList object
         this.receiveList_.add(gridlet);
     }
	
}

// part 3, print the received gridlet list
printGridletList(this.receiveList_);

---

Then, during the execution, I got the prompted warning :
Resource_0: Warning - Gridlet #2 owned by Example4 is already  
completed/finished.

The more gridlets were submitted, the more warning will be prompted.

I have to say, it seems there is no mistake caused by this warning.  
But to understand the infrastructure better, is there anyone could  
help me about why it appears and how to avoid it?

--- ---- [end] --------------

Regards
ye


On 9 Feb, 2009, at 6:09 PM, Jeyarani Rajarathinam wrote:

> Hi Friends,
>     I am using GridSim4.0 and I have  created new internal policy  
> instead
> of FCFS. I get the following error. Please help me to correct the  
> problem
>
> JR
> I have submitted 4 gridlets  and the fourth gridlet is small  
> compared to
> rest.
>
> Sim_system: No more future events
> Gathering simulation data.
> GridResource_0: Warning - Gridlet #3 owned by User_0 is already
> completed/finish
> ed.Exception in thread "Thread-9"
> java.lang.NullPointerExceptionTherefore, it is not being executed  
> again
>
>        at Example8.body(Example8.java:107)
>
>        at eduni.simjava.Sim_entity.run(Sim_entity.java:603)
> ------------------------------------------------------------------------------
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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/
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