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

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

Hi Ye,

As I said in another e-mail, if you don't finalise the simulation  
properly, the error messages you get may not have anything to do with  
the actual mistake. In fact, SimJava2 has a strange design in which  
they made all the entities as threads, it simplifies the programming  
but compromises debugging and troubleshooting.

By the way, Sim_system.running() will always be true if you don't  
shutdown all the user entities.

Regards,

Marcos


On 17/02/2009, at 12:01 AM, ye huang wrote:

> Hi, Marcos:
> Thanks for help!
>
> I am sorry, the "resubmit" should be erased from the demo, so do the
> following code:
> --- --- ---
>             if(resubmit) {
>             	LinkedList ll = createGridlet( this.ID_.intValue() );
>             	for(int k = 0; k < ll.size(); k++) {
>             		this.list_.addLast(ll.get(k));
>             	}
>             	
>             	resubmit = false;
>             }
> --- --- ---
> they are not the point.
>
>
> You are right, the LOOP while should be finished with the following
> code to exit properly.
> --- --- ---
>                 if(receiveList_.size() == list_.size()) {
>                 	break;
>                 }
> --- --- ---
>
>
> However, I mean to ignore the code to check the wired print result. If
> the above loop-exit code is NOT attached, I understand the while()
> could exit properly, but why I got the following print:
>
> --- --- ---
> ... ... ... exit gridlet submiting loop
> Sim_system: No more future events
> Gathering simulation data.
> ... ... ... to exit gridsim
>
> ========== [OUTPUT:] ==========
> Gridlet ID    STATUS    Resource ID    Cost
>      0        SUCCESS        5        27.851458885941653
>      1        SUCCESS        5        39.787798408488065
>      2        SUCCESS        5        71.61803713527851
>      2        SUCCESS        5        71.61803713527851
> Resource_0: Warning - Gridlet #2 owned by Example041 is already
> completed/finished.
> Therefore, it is not being executed again
>
> --- --- ---
>
> It seems the gridlet #2 is resubmitted again to the GridResource after
> its status had been changed to "Success".
> Also, you can see the Sim_system.running() has caught the duplicate
> returned Gridlet and prints two lines:
>
>      2        SUCCESS        5        71.61803713527851
>
>
> I mean, even the while() loop can't exit properly(keep monitoring
> incoming events), why there is a duplicate gridlet submit/return
> message?
>
> Regards
> ye
>
> On 16 Feb, 2009, at 1:23 PM, Marcos Dias de Assuncao wrote:
>
>>
>> Hi Ye,
>>
>> Please change this part of the code:
>>
>> ---------------------------------
>>    		if (ev.get_tag() == GridSimTags.GRIDLET_RETURN){
>>    			gridlet = (Gridlet) ev.get_data();
>>    			super.recordStatistics("[ticking]: Received grildet: " +
>> gridlet.getGridletID() + " from " +
>>                        resourceName + "\"",
>> gridlet.getProcessingCost());
>>
>>                // stores the received Gridlet into a new GridletList
>> object
>>                this.receiveList_.add(gridlet);
>>            }
>> ---------------------------------
>> to:
>> ---------------------------------
>>    		if (ev.get_tag() == GridSimTags.GRIDLET_RETURN){
>>    			gridlet = (Gridlet) ev.get_data();
>>    			super.recordStatistics("[ticking]: Received grildet: " +
>> gridlet.getGridletID() + " from " +
>>                        resourceName + "\"",
>> gridlet.getProcessingCost());
>>
>>                // stores the received Gridlet into a new GridletList
>> object
>>                this.receiveList_.add(gridlet);
>>
>>                if(receiveList_.size() == list_.size()) {
>>                	break;
>>                }
>>            }
>> ---------------------------------
>>
>> Otherwise your simulation will never end and you will get those
>> errors. Also, I am sorry, but I could not understand what you want
>> to do in this part of the code:
>>
>> -------------------------------
>> boolean resubmit = true;
>>
>>        // a loop to get one Gridlet at one time and sends it to a  
>> grid
>>        // resource entity. Then waits for a reply
>>        for (int i = 0; i < this.list_.size(); i++)
>>        {
>>            gridlet = (Gridlet) this.list_.get(i);
>>            info = "Gridlet_" + gridlet.getGridletID();
>>
>>            System.out.println("Sending: " + info + " to " +
>> resourceName +
>>                    " with id = " + resourceID);
>>
>>            // Sends one Gridlet to a grid resource specified in
>> "resourceID"
>> //            super.gridletSubmit(gridlet, resourceID);
>>
>>            // OR another approach to send a gridlet to a grid
>> resource entity
>>            super.send(resourceID, GridSimTags.SCHEDULE_NOW,
>>                  GridSimTags.GRIDLET_SUBMIT, gridlet);
>>
>>            if(resubmit) {
>>            	LinkedList ll = createGridlet( this.ID_.intValue() );
>>            	for(int k = 0; k < ll.size(); k++) {
>>            		this.list_.addLast(ll.get(k));
>>            	}
>>            	
>>            	resubmit = false;
>>            }
>>
>> ----------------------
>>
>> resubmit will be true initially, which will make "inkedList ll =
>> createGridlet( this.ID_.intValue() );" create a new list of gridlets
>> with the same ids of the gridlets that are already in list_.
>>
>> Regards,
>>
>> Marcos
>>
>>
>> On 16/02/2009, at 7:40 PM, ye wrote:
>>
>>> <Example041.java>
>>
>> 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...
>>
>> -------------
>> "It is well enough that people of the nation do not understand our
>> banking and monetary system, for if they did, I believe there would
>> be a revolution before tomorrow morning."
>>
>> Henry Ford
>>
>
>
> --
>
> 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...

-------------
"It is well enough that people of the nation do not understand our  
banking and monetary system, for if they did, I believe there would  
be a revolution before tomorrow morning."

Henry Ford