Improving Chord Network Performance Using Geographic Coordinates

  • Sonia Gaied Fantar
  • Habib Youssef
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5659)


Structured peer-to-peer overlay networks such as Chord, CAN, Tapestry, and Pastry, operate as distributed hash tables (DHTs). However, since every node is assigned a unique identifier in the basic design of DHT (randomly hashed), ”locality-awareness” is not inherent due to the topology mismatching between the P2P overlay network and the physical underlying network. In this paper, we propose to incorporate physical locality into a Chord system. To potentially benefit from some level of knowledge about the relative proximity between peers, a network positioning model is necessary for capturing physical location information of network nodes. Thus, we incorporate GNP (Global Network Positioning) into Chord (Chord-GNP) since peers can easily maintain geometric coordinates that characterize their locations in the Internet. Next, we identify and explore three factors affecting Chord-GNP performance: distance between peers, message timeout calculation and lookup latency. The measured results show that Chord-GNP efficiently locates the nearest available node providing a locality property. In addition, both the number of the messages necessary to maintain routing information and the time taken to retrieve data in Chord-GNP is less than that in Chord.


Overlay Network Distribute Hash Table Close Node Geometric Space Rout Table Entry 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Sonia Gaied Fantar
    • 1
  • Habib Youssef
    • 1
  1. 1.Research Unit Prince, ISITC Hammam SousseUniversity of SousseTunisia

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