3rd International ICST Conference on Collaborative Computing: Networking, Applications and Worksharin

Research Article

Multicasting in Groupware?

  • @INPROCEEDINGS{10.1109/COLCOM.2007.4553826,
        author={Sasa Junuzovic and Prasun Dewan},
        title={Multicasting in Groupware?},
        proceedings={3rd International ICST Conference on Collaborative Computing: Networking, Applications and Worksharin},
        keywords={Multicast Response Feedthrough Task Completion Times},
  • Sasa Junuzovic
    Prasun Dewan
    Year: 2008
    Multicasting in Groupware?
    DOI: 10.1109/COLCOM.2007.4553826
Sasa Junuzovic1,*, Prasun Dewan1,*
  • 1: Department of Computer Science, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
*Contact email: sasa@cs.unc.edu, dewan@cs.unc.edu


While multicast has been studied extensively in many domains such as content streaming and file sharing, there is little research applying it to synchronous collaborations involving shared access to a distributed object. Based on several cases of real-world collaborations involving instant messaging, distributed lectures, and computationally-intensive collaborative game playing, we show that compared to traditional centralized and replicated collaboration architectures, a new bi-architecture collaboration system model with multicasting support can improve response, feedthrough, and task completion times. In addition, we show that to optimize performance, the set of traditionally considered factors, consisting of network delays and transmission costs, must be expanded to include several new factors, such as processing costs, scheduling policies, and think times. In one or more of the real-world collaborations we consider, we show that multicast (a) can increase feedthrough times if processing costs and scheduling policies are not considered and (b) may degrade or improve task completion times depending on the cost of computing the multicast overlay.