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

[Srikumar V. <sri...@gm...>]

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:
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> 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
>
> - --
> - -----------------------------------------------------------------------
> 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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