Re: [GridSim-users] datagrid package - total execution time

[Jonathan M. <jon...@bs...>]

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Ok, then using FlowLinks instead of SimpleLinks I get this error:

Exception in thread "Thread-15" java.lang.ClassCastException:
gridsim.net.NetPacket cannot be cast to gridsim.net.flow.FlowPacket
        at gridsim.net.flow.FlowLink.registerFlow(FlowLink.java:419)
        at gridsim.net.flow.FlowLink.enque(FlowLink.java:316)
        at gridsim.net.flow.FlowLink.processEvent(FlowLink.java:230)
        at gridsim.net.flow.FlowLink.body(FlowLink.java:202)
        at eduni.simjava.Sim_entity.run(Sim_entity.java:603)

Any ideas?

Thanks



Srikumar Venugopal escribió:
> Hi Jonathan,
>     You are probably using the packet network in which each file is
> divided into packets of, AFAIK, 64KB each. Each of the packets is an
> entity so the number of objects exponentially increases. You could use
> the latest GridSim (4.2) which is supposed to have flow networking in
> which each data transfer is represented as a flow or you can make the
> packet size equal to the file size.
>      Another choice is to hack in a flow transfer by making the
> recipient get only 2 packets ,one at the start of a file and one at
> the end sent after a delay equal to size of file divide by bandwidth.
> 
> HTH
> 
> Srikumar.
> 
> On Thu, Mar 5, 2009 at 4:47 AM, Jonathan Marti <jon...@bs...> wrote:
> Hi good afternoon,
> 
> I'm working on the datagrid package of GridSim and I wanted to execute a very
> simple simulation with a simple network topology (up to 6 routers) that form a
> complete graph of links among them.
> 
> But I have a problem with total time execution of the simulation...here you have
> some results:
> 
> #routers    total exec. time (milliseconds)
> 2 (1 link)      340
> 3 (3 links)     380
> 4 (6 links)     3000    (3 seconds)
> 5 (10 links)    600000  (10 minutes)
> 
> Extrapolating, with 6 routers would be 6 hours, ... with 8 routers (28 links) 52
> years! :-S
> 
> There is only 1 user, that sends 1 gridlet with a file of 1MB (very simple)
> 
> And I'm using a laptop with an Intel Core 2 Duo 2,4GHz processor, and 4GB of RAM.
> 
> Could anybody tell if this is normal, and why is it happening?...or better, does
> anbydoy know a solution for this, or has any idea?
> 
> Thank you very much
> 
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Jonathan Martí Fraiz
Storage Systems Research Group  - Computer Sciences Department
Barcelona Supercomputing Center - Centro Nacional de Supercomputación
www   : http://www.bsc.es/StorageSystems
email : jonathan(dot)marti(at)bsc(dot)es
phone : (0034) 934054281
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