Distributed Simulation with MPI in ns-3.dvi
نویسندگان
چکیده
While small topology simulations are important for validation and educational purposes, large-scale network simulations are a fundamental part of active networking research. Therefore, it is important for a network simulator to provide scalable and efficient solutions to execute these types of scenarios. Using standard sequential simulation techniques, large-scale topologies with substantial network traffic will require lengthy simulation execution times and a considerable amount of computer memory. Often, these execution times are too long for a networking researcher to run multiple simulations and collect significant data. Parallel and distributed simulation is one method that allows researchers to efficiently simulate these large topologies by distributing a single simulation program over multiple interconnected processors. To enable this scalable simulation methodology in ns-3, we formally present our distributed simulator, introduced in ns-3.8. This simulator uses the Message Passing Interface (MPI) standard and a conservative lookahead mechanism. Using the distributed simulator, we conducted a performance study using a large-scale point-to-point campus network scenario with a variable number of nodes distributed across several interconnected processors within a computer cluster. We show near-optimal improvements in simulation execution time are possible using the distributed simulator in ns-3.
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تاریخ انتشار 2011