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Second Workshop on Real, Large Distributed Systems—Preliminary Abstract

Pp. 19–24 of the Proceedings

Supporting Network Coordinates on PlanetLab

Peter Pietzuch, Jonathan Ledlie, and Margo Seltzer, Harvard University


Large-scale distributed applications need latency information to make network-aware routing decisions. Collecting these measurements, however, can impose a high burden. Network coordinates are a scalable and efficient way to supply nodes with up-to-date latency estimates. We present our experience of maintaining network coordinates on PlanetLab. We present two different APIs for accessing coordinates: a per-application library, which takes advantage of application-level traffic, and a stand-alone service, which is shared across applications. Our results show that statistical filtering of latency samples improves accuracy and stability and that a small number of neighbors is sufficient when updating coordinates.
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Last changed: 13 Dec. 2005 jel
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