[Click] nsclick rng support for ns3

[Eddie Kohler]

Hey,

Two comments.
- Breaking random numbers except for nses that export random numbers
considered lame. Why not fall back to the normal random number
generator?
- The RAND_MAX value seems odd. (-2??) Why this value?

Eddie

On Wed, Jan 23, 2013 at 3:52 AM, Lalith Suresh <suresh.lalith at gmail.com> wrote:
> Hi,
>
> On Mon, Jan 21, 2013 at 12:16 PM, Sascha Alexander Jopen
> <jopen at informatik.uni-bonn.de> wrote:
>> Hey,
>>
>> please find attached a patchset for click and ns3 which adds support for
>> drawing random numbers within click simulations from the underlying ns3
>> random number generator. Each simulated click node has its own uniformly
>> distributed random number stream (as opposed to my previously submitted
>> patch). This way all nodes have independent random number streams.
>>
>> Setting the seed or run numbers is done within the simulation by means of
>>
>> RngSeedManager::SetSeed ();
>> RngSeedManager::SetRun ();
>>
>> or with environment variables or command line parameters.
>> See http://www.nsnam.org/docs/manual/html/random-variables.html
>>
>> I still have no ns2 available. Currently, missing rng support from the
>> simulator side is detected and reported but no random numbers are
>> available to the simulation. Implementing a fallback method should be
>> possible, however. Maybe someone who uses ns2 could provide this?
>>
>> click-ns3-rng.diff is for the click side and ns3-nsclick-rng.diff for
>> the ns3 side.
>>
>
> I had a look through this patch. For clarity, my comment is to rename
> the simclick command to SIMCLICK_GET_RANDOM_INT and the
> Ipv4ClickRouting method's name to GetRandomVariable(). Otherwise, it
> looks good.
>
> I can push this to ns-3-dev when the click side gets committed.
>
>> Regards,
>> Sascha
>>
>> --
>> Dipl.-Inform. Sascha Jopen
>>
>> University of Bonn                     Tel.:   +49-228-73-54219
>> Institute of Computer Science 4        Fax:    +49-228-73-4571
>> Friedrich-Ebert-Allee 144              E-mail: jopen at cs.uni-bonn.de
>> D-53113 Bonn, Germany
>>
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>
>
>
> --
> Lalith Suresh
> www.lalith.in
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