Sophia: An information plane for networked systems

Mike Wawrzoniak, Larry Peterson, Timothy Roscoe

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


This paper motivates and describes an example network Information Plane, called Sophia, currently deployed on PlanetLab. Sophia is a distributed system that collects, stores, propagates, aggregates, and reacts to observations about the network's current conditions. Sophia's approach is novel: it can be viewed as a multi-user distributed expression evaluator in which sensors and actuators form the ground terms, and statements take on the complete expressiveness of a logic language like Prolog. This paper argues that this approach has several advantages in managing and controlling a complex, federated, and evolving network: (1) a declarative logic language provides a natural way to express the kinds of statements that are common to this application domain, through temporal and positional logic rules, facts and expressions; and (2) distributed evaluation of such logic expressions provides many opportunities for performance optimization yielding an efficient system.

Original languageEnglish (US)
Pages (from-to)15-20
Number of pages6
JournalComputer Communication Review
Issue number1
StatePublished - Jan 2004
Externally publishedYes

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications


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