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Performance Evaluation

Simulation Setup

In this section, we conduct trace-driven simulation to validate the proposed analytic model, time evolutions of nodes, and performance of information dissemination. The trace data are from the logs of MSN system developed by Xi’an Jiaotong University, based on the XMPP Protocol. The MSN system is used for the students in the university. And the data for our simulation was taken during the period from Aug. 26, 2013 to Sept. 2, 2013. Based on the communication between two friends, a social graph can be generated by the above trace. We use the largest connected sub-graph of this social graph to conduct our experiments. The basic parameters of this graph are N = 802, E = 1222, where the average degree is 3.05. The largest degree and smallest degree in the social graph are 72 and 1, respectively, which indicates a large degree fluctuation. Since the existing empirical studies show that the average intercontact time between two users is around 5h [40], we determine that the parameter of the exponential distribution of inter-contact is X = 0.002 with the unit time of the system as 0.01 h.

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