Randomly select nodes from network

[Alex Berger]

Dear all

Is there an option to randomly select a specific number of nodes from a network?
Scenario: network with 1000 nodes and a fixed number of these nodes, e.g. 10 nodes, should be sender and the rest receiver.

Is it possible to randomly select these 10 nodes out of the 1000?

Possible workarounds may be:
1. every node randomly decides for itself in the initialization phase with probability 1% to be a sender and else be a receiver. The disadvantage is that there may be variations in the exact number of selected nodes (not exactly 10).
2. set in omnetpp.ini which nodes/hosts are sender and the rest is receiver. Advantage: constant group size possible, disadvantage: always same node Ids as senders.

Therefore, is it possible to randomly select exactly 10 nodes out of 1000 with changing node Ids?

I guess in case of mobility, option 2 may be ok since each node position and movement may change with different seed/run-number. Is that right?

 

[Alfonso Ariza Quintana]

If the position change randomly you can use always the same nodes like sources (for example 0 to 9)

 

Every time that you change the seed the position of these nodes will change and the adjacencies will be others

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[Alex Berger]

Thank you for the response.
So, this means as long as I have a random number generator for the mobility module, the adjacencies are different (as long as the seed is different, which will be automatically the case with cMersenneTwister in different runs). Is this correct?

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[Alfonso Ariza Quintana]

Yes it’s, if the position of the nodes are chosen randomly, in every simulation the position and adjacencies will be different

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[Alex Berger]

Perfect, thank you for the clarification.

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[N.omar]

What If I need to choose the sources randomly each time ( not the same for each number of nodes ) i.e for 10 nodes randomly assign 3 sources and other three as distinations. But in case of 20 nodes i want randomly others destinations and sources assigned ! 

I don't know if it is clear !!! 

[Ivo Calado]

Hi fellows,
I have a similar problem (ie randomly select nodes). Nevertheless,
my topology is fixed so I really need to select a random node in the
config file. I tried this

**.host[${intuniform(0,79)}].appl.dstAddr = <sink address>

Whit this configuration (in a network with 80 nodes), no node is
select. Why this behavior?

Best regards,
Ivo

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Ivo Augusto Andrade Rocha Calado
PhD candidate in Electrical Engineering
Embedded Systems and Pervasive Computing Lab - http://embedded.ufcg.edu.br
Electrical Engineering Department - http://dee.ufcg.edu.br/
Electrical Engineering and Informatics Center - http://www.ceei.ufcg.edu.br
Federal University of Campina Grande - http://www.ufcg.edu.br

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