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

[Azin M. <az...@ma...>]

Hi,

I have experienced the same problem too ! 

It seemed to me that GridSim shuts itself down once it does not find 
any events in its queue while there may be other events coming up after 
some time....This is my guess and I am not sure if its correct.

I think there is something which should be done within the framework to 
fix it.

Regards,
Azin

ye huang wrote:


>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/
>Office: +41 26 429 65 95
>
>
>
>
>


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------------------------------------------------------------------------
------
>Create and Deploy Rich Internet Apps outside the browser with 
Adobe(R)AIR(TM)
>software. With Adobe AIR, Ajax developers can use existing skills and 
code to
>build responsive, highly engaging applications that combine the power 
of local
>resources and data with the reach of the web. Download the Adobe AIR 
SDK and
>Ajax docs to start building applications 
today-http://p.sf.net/sfu/adobe-com
>


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