Re: [GridSim-users] How to do Dynamic Gridlet Submission

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

Dear Azin,

Using a thread will not work as you expect.

I think that what you want can be implemented in the following  
manner. You can create a GridSim entity that submits the gridlets as  
you have already created. However, this entity may submit a new  
Gridlet whenever a given internal event is received. As an example, I  
am providing some sample code wherein the entity schedules a new  
Gridlet whenever another returns. The entity's body method would look  
like this:


public void body() {
...
		int numofGrls = 10;
		int grlReceived = 0;
		
		Sim_event ev = new Sim_event();
		while (grlReceived < numofGrls) {
			super.sim_get_next(ev);
			if(ev.get_src() == super.get_id() &&
					ev.get_tag() == SUBMIT_ONE_MORE_GRIDLET) {
			
				// Submit the gridlet here...
				super.gridletSubmit(gridlet, resID);
			}
			else if (ev.get_tag() == GridSimTags.GRIDLET_RETURN) {
				// add the gridlet to a list, print it or do whatever is required  
here...
				grlReceived++;
				super.sim_schedule(super.get_id(),
						GridSimTags.SCHEDULE_NOW, SUBMIT_ONE_MORE_GRIDLET);
			}
		}
...
}


where SUBMIT_ONE_MORE_GRIDLET is just a new tag defined in the class:

private static final int SUBMIT_ONE_MORE_GRIDLET = 5000;

I think this might give you an idea on how it works.

Regards,

Marcos


On 16/06/2008, at 12:48 PM, Azin Moallem wrote:

> Hi,
>
> I have a question simulating a scheduling algorithm using GridSim  
> and I
> would be greatful to hear back.
>
> I need to simulate a dynamic job submission. I mean while gridlets are
> being submitted to the grid, completed gridlets are being sent back to
> users. To do this I am simulating submission of gridlets in the body
> function of a GridSim entity and receiving back the gridlets is the
> responsibilty of a Thread which I have created myself.
>
> The problem is gridletReceive() always returns null ! and I see this
> output: "Sim_system: No more future events" early in my simulation.
>
> how can i simulate a dynamic job submission environment ?
>
>
> Best,
> Azin
>
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