A Longitudinal Characterization of Local and Global BitTorrentWorkload Dynamics
Workload characterization is important for understanding how systems and services are used in practice and to help identify design improvements. To better understand the longitudinal workload dynamics of chunk-based content delivery systems, this paper analyzes the BitTorrent usage as observed from two different vantage points. Using two simultaneously collected 48-week long traces, the authors analyze the differences in download characteristics and popularity dynamics observed locally at a university campus versus at a global scale. They find that campus users typically download larger files and are early adapters of new content, in the sense that they typically download files well before the time at which the global popularity of the files peak.