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ns-2 distributed clients emulation: accuracy and scalability

Kristiansen, Stein; Plagemann, Thomas Peter
Chapter; PublishedVersion; Peer reviewed
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10.1.1.679.5127.pdf (1.019Mb)
Year
2009
Permanent link
http://urn.nb.no/URN:NBN:no-74910

CRIStin
42708

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  • Institutt for informatikk [3603]
  • CRIStin høstingsarkiv [15868]
Original version
Proceedings of the 2nd International Conference on Simulation Tools and Techniques for Communications, Networks and Systems, SimuTools 2009. 2009, DOI: https://doi.org/10.4108/ICST.SIMUTOOLS2009.5595
Abstract
ns-2 is a well known network simulator, recently extended with improvements to its emulation facility. Real-time constraints and the boundary between real-world and simulated entities impose scalability and accuracy limitations, and distort the simulated network as perceived by the involved real-world applications. This paper presents results from a performance evaluation of the ns-2 emulation facility. Conducting emulation experiments of differing magnitudes, and under varying emulation environment set-ups, we unveil central types of scalability limitations and obtainable accuracy. We find throughput limits using high and low end computers, and a significant throughput decrease when increasing the number of involved real-world applications. We furthermore show how end-to-end delay increases both with traffic load and an increasing number of involved real-world applications. Moreover, during these conditions, we find that the system treats these applications increasingly unfair by distributing total throughput unevenly between them, and by imposing different amounts of end-to-end delay.
 
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