[brite-users] Waxman et al

David Manz davidmanz at uidaho.edu
Fri Jul 21 07:45:11 EDT 2006


That is unfortunate. I believe what happened is that when M was
implemented for BA et al, they implemented it for waxman, where it
shouldnt be.

Are you saying there are problems with the BA implementations (and maybe
BA2 and GLP) as well? I am just starting to look at the code for BA and
compare it to the algorithms in liturature.

~David Manz

----- Original Message -----
From: grasssu <grasssu at gmail.com>
Date: Friday, July 21, 2006 2:13 am
Subject: [brite-users] Re: brite-users Digest, Vol 33, Issue 5
To: brite-users at cs.bu.edu

> 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>
> > Content-Type: text/plain; charset=us-ascii
> >
> > 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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