[brite-users] Re: brite-users Digest, Vol 33, Issue 5

grasssu grasssu at gmail.com
Fri Jul 21 02:06:28 EDT 2006


I have the same questions.  Unfortunately there seems to be no support for 
it at all. :(
I asked some similar questions abotu the BA model but nobody answered...
----- Original Message ----- 
From: <brite-users-request at cs.bu.edu>
To: <brite-users at cs.bu.edu>
Sent: Thursday, July 20, 2006 9:00 AM
Subject: brite-users Digest, Vol 33, Issue 5


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> Today's Topics:
>
>   1. Waxman concerns (David Manz)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 19 Jul 2006 15:30:59 -0400
> From: David Manz <davidmanz at uidaho.edu>
> Subject: [brite-users] Waxman concerns
> To: brite-users at cs.bu.edu
> Message-ID: <f78d8b201652.1652f78d8b20 at uidaho.edu>
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>
> Greetings,
>
>  I am looking and using Brite for various network topologies, from
> small LAN to an Internet representation.
>
> However the more I have looked into Brite the more confused I became.
>
> Using the default settings HS: 1000, LS: 100, Node: 1000, Waxman model,
> alpha: 0.15, beta 0.2, and M=2 I got some interesting results.
>
> Using the java exe growth type inc gives 2000 links.
> Using the java exe growth type all gives 999 links.
>
> Using the C++ exe growth type inc gives 2000 links (same)
> Using the C++ exe growth type all gives a varying number between 
> 4000-6000.
>
> What explains the discrepancy between the java and C++ version?
>
> Furthermore, why when using the waxman model is there even a difference
> between growth types?  Waxman unlike BA does not have any room for
> growth, it simply connects nodes based on distance and weights, (isn't
> that correct).  But, in effect, Brite does N*M for inc growth, and N-1
> for all growth.
>
> Why isn't the number of links based upon topology and the alpha value?
>
>
> Now, given the Waxman model:
> P(u, v) = ae-d/(bL)
>
> a should be the value to affect the number of links.
> However given default simulator conditions the varying of a (alpha) has
> NO affect on the number of links. And the simulator simply creates N*M
> or N-1 depending on growth type selected.
>
>
> Which really leads us to the question of what is m?  It is defined in
> the user guide as "Number of connections per new node"?  But it seems
> that the waxman model should be deciding the number of connections per
> node not m? M seems to have superseded the algorithm?
>
>
> Sorry for the long email, I really hope that someone can shed some light
> onto the waxman implementation in Brite.
>
>
> In Summary:
> Q1: diff between java and C++?
> Q2: why does growth type even affect waxman?
> Q3: what is M and why does alpha have no affect?
>
> Sincerely,
>   David Manz
>
>
>
>
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> End of brite-users Digest, Vol 33, Issue 5
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