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IROP Research Presentation
A JXTA Performance Evaluation David A. Noblet Department of Computer Science University of New Hampshire
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Rennes, France Population: 195,000 Capital of Brétagne Famous for…
2 Rennes, France Population: 195,000 Capital of Brétagne Famous for… Half-timbered houses Cobblestone roads Crêpes Home of… University of Rennes IRISA Lab
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La vie quotidienne (Daily Life)
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!
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Work Hard. Break Hard. Work as a social environment Togetherness
4 Work Hard. Break Hard. Work as a social environment Togetherness Lunch “Café (Coffee)?” Busy evenings Late mornings
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My Research IRISA Lab PARIS Team JuxMem Project
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
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Computer Networks Communication groups Network services
6 Computer Networks Communication groups Directed graph representation Network services Typical examples Websites Instant messaging
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The Client-Server Model
7 The Client-Server Model Two different roles Client Server Traditional Web browser - Web server client - server Simple Problems Scalability Fault tolerance
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The Peer-to-Peer Model
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
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JXTA (http://www.jxta.org)
9 JXTA ( 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
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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
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11 Some Results (1 of 3)
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12 Some Results (2 of 3)
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13 Some Results (3 of 3)
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Conclusions JXTA doesn’t perform too poorly It does introduce overhead
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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