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IROP Research Presentation

IROP Research Presentation. A JXTA Performance Evaluation. David A. Noblet Department of Computer Science University of New Hampshire. 2. Rennes, France. Population: 195,000 Capital of Brétagne Famous for… Half-timbered houses Cobblestone roads Crêpes Home of… University of Rennes

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IROP Research Presentation

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  1. IROP Research Presentation A JXTA Performance Evaluation David A. Noblet Department of Computer Science University of New Hampshire

  2. 2 Rennes, France • Population: 195,000 • Capital of Brétagne • Famous for… • Half-timbered houses • Cobblestone roads • Crêpes • Home of… • University of Rennes • IRISA Lab

  3. 3 La vie quotidienne (Daily Life) • Almost everything is similar • Almost nothing is the same • Some important differences: • Stores close early • Transportation is punctual • What commercials? • There are no change machines!

  4. 4 Work Hard. Break Hard. • Work as a social environment • Togetherness • Lunch • “Café (Coffee)?” • Busy evenings • Late mornings

  5. 5 My Research • IRISA Lab • PARIS Team • JuxMem Project • Peer-to-peer data sharing service • Enables groups of computers to dynamically organize into a virtual data storage unit • Could potentially allow research organizations to easily share common data • Performance concerns

  6. 6 Computer Networks • Communication groups • Directed graph representation • Network services • Typical examples • Websites • Email • Instant messaging

  7. 7 The Client-Server Model • Two different roles • Client • Server • Traditional • Web browser - Web server • Email client - Email server • Simple • Problems • Scalability • Fault tolerance

  8. 8 The Peer-to-Peer Model • One role -- The Peer • Both requests and provides service • More recent • Examples • Music sharing • Gnutella • WinMX • Advantages • Scales well • Not centrally dependent • Problems • Extra Complexity --> Overhead

  9. 9 JXTA (http://www.jxta.org) • Provides • Set of XML-based peer-to-peer protocols • Application framework to use the protocols • Solves common peer-to-peer problems • Runs under Java (though there are others) • Used by JuxMem • Common perceptions • Java is slow • XML is bulky • Peer-to-peer services = lots of overhead

  10. 10 Testing Performance • JXTA = Peer-to-peer + XML + Java = Bad performance? • Maybe • It is a concern • Performance metrics • Bandwidth (speed) • Latency (responsiveness) • How to find out • Test! • Round Trip Time (RTT) acknowledgement message

  11. 11 Some Results (1 of 3)

  12. 12 Some Results (2 of 3)

  13. 13 Some Results (3 of 3)

  14. 14 Conclusions • JXTA doesn’t perform too poorly • Can basically saturate a Fast-Ethernet (100 Mb/s) connection • Would be good for things like large file transfers • It does introduce overhead • Not incredibly responsive • Has trouble keeping up with Myrinet

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