A ns2-based simulation framework for performance evaluation of overlay networks
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1 A ns2-based simulation framework for performance evaluation of overlay networks Michele Amoretti Francesco Zanichelli Università di Parma Mauro Andreolini Riccardo Lancellotti Università di Modena e Reggio Emilia FIRB Web-Minds, Genova Ottobre
2 Peer-to-peer systems Increasing number of P2P-based applications Streaming Filesystems... Need for tools to evaluate performance of overlay networks and routing algorithms Prototypes too many nodes required Analytical models may be too complex Simulation Need for simulators of overlay networks Already validated models and tools FIRB Web-Minds, Genova Ottobre
3 ns-2 Network simulator Standard de facto in network simulation Widely adopted in scientific community Little support for overlay (P2P) networks Some P2P feature in code for ad-hoc networks (specific for message routing in wireless links) Gnutella sim (support only for Gnutella v0.4, requires patches and is not maintained) Need of ns-2 extensions for overlay networks FIRB Web-Minds, Genova Ottobre
4 Proposal Simulation framework for overlay networks Based on widely-accepted ns-2 simulator Focus on performance evaluation Elements of the framework Overlay routing algorithms (C++ classes) Topology generators (TCL scripts) Data analysis tools FIRB Web-Minds, Genova Ottobre
5 Overlay routing algorithms Flexible base class hierarchy Object-oriented design: key classes Support classes Transport-level data Logging facility P2P routing Easy to extend New algorithm New class (+ TCL binding) FIRB Web-Minds, Genova Ottobre
6 Available algorithms Unstructured networks Flood-based Probabilistic flood Random Walker Semi-structured networks Support for supernodes JXTA DHT Pastry Novel algorithms Halo Fuzzy-DHT FIRB Web-Minds, Genova Ottobre
7 Logging facility Separate logfile for P2P network operations Reports routing events: Hits Miss Query drop For each event logs additional information such as: Simulation time of the event Query TTL Query key Additional information (algorithm-supplied) Log file easy to parse (regexp-friendly) FIRB Web-Minds, Genova Ottobre
8 TCL scripts Library of TCL scripts for the simulation Definition of Physical topology Construction of overlay network Logging of generated topologies Population of overlay network (resources) Setup of log files Generation of queries Multiple available functions for each phase TCL support for algorithms parameters TCL support for command-line options Sensitivity analysis can be carried out without changing C++ and TCL code FIRB Web-Minds, Genova Ottobre
9 Physical network topologies Star topology Real Network model (UniPR) Hierarchical topologies (Brite generated) FIRB Web-Minds, Genova Ottobre
10 Overlay network topologies Neighborhood relationships Available topologies Poisson networks Scale Free networks Seeded networks Locally preferential networks JXTA growth (JXTANetMap) FIRB Web-Minds, Genova Ottobre
11 TCL support for resources and queries Trace-driven simulation Repeatable simulation Support for multiple RNG seeds Traces for resources Distribution of resources over nodes Traces for queries Sequence of keys to search in the network Support for wildcard searches Queries can have different selectivity σ Allows to evaluate overlay routing algorithms performance as a function of σ FIRB Web-Minds, Genova Ottobre
12 Data collection and analysis tools Automated analysis of logfile Perl-based log parser P2P logs Standard ns-2 logs Topology logs Automatic statistic extraction Histograms Cumulative distribution Automatic plotting Template gnuplot files FIRB Web-Minds, Genova Ottobre
13 Available analyses Hit rate (# of hits/theoretical max) Exact searches Wildcard-based searches TTL of hits Time of hits Overhead (# of pkts per query) Topology of overlay network FIRB Web-Minds, Genova Ottobre
14 Experimental testbed CASPUR Cluster 40 Nodes, dual AMD 64 CPU, 8GB RAM, SUSE Linux OpenPBS batch scheduler WebLAB Cluster 20 Nodes, Intel Xeon CPU, 1GB RAM, Debian Linux UniPR Cluster 7 Nodes, Intel Pentium IV, 1GB RAM, Ubuntu Linux Simulator compiles and runs correctly in every environment (including 64 bit) Simulation of up to 4000 Nodes FIRB Web-Minds, Genova Ottobre
15 Publications M. Andreolini, R. Lancellotti P. S. Yu, A flexible and efficient lookup algorithm for Peer-to-Peer systems, Submitted for publication, 2006 M. Amoretti, F. Zanichelli, G. Conte, Performance evaluation of advanced routing algorithms for unstructured Peer-to-peer Networks, ValueTools 2006 M. Amoretti Peer-to-peer based Grid architectures Ph.D. thesis, 2006 M. Andreolini, R. Lancellotti P. S. Yu, Analysis of peerto-peer systems: workload characterization and effects on traffic cacheability MASCOTS 2004 FIRB Web-Minds, Genova Ottobre
16 A ns2-based simulation framework for performance evaluation of overlay networks Michele Amoretti Francesco Zanichelli Università di Parma Mauro Andreolini Riccardo Lancellotti Università di Modena e Reggio Emilia FIRB Web-Minds, Genova Ottobre
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