Abstract-We present the results of an analysis of the usage of our new campus-wide wireless network. A week-long traffic trace was collected in January 2003, recording address and protocol information for every packet sent and received on the wireless network. A centralised authentication log was used to match packets with wireless access points. The trace was analysed to answer questions about where, when, how much, and for what our wireless network is being used. Such information is important in evaluating design principles and planning for future network expansion.
Processor scheduling on multiprocessor systems that simultaneously run concurrent applications is currently not well-understood. This paper reports a preliminary investigation of a number of fundamental issues which are important in the context of scheduling concurrent jobs on multiprogrammed parallel systems. The major motivation for this research is to gain insight into system behaviour and understand the basic principles underlying the performance of scheduling strategies in such parallel systems. Based on abstract models of systems and scheduling disciplines, several high level issues that are important in this context have been analysed.
A distributed file system provides file service from one or more shared file servers to a community of client workstations over a network. Wliile the clieiit-.sewer paradigm h a s many advantages, at also presents iieui challenges to system designers concerning performance a n d reliability. As both client workstations and file seruers become increasingly well-resourced, a number of system design decisions need to be re-examined. This research c0ricerii.s the caching of disk blocks in a distributed client-server environment. Some recent research has suggested that various strategies for cache inanageirierit inay not be equally suited to the circumstances at both the client and the server. Since any c(ic1iing strategy is based or1 assumptions concerning the characteristics of the demand, the perforiiiaiice of the strategy is only as good as the accuracy of this assuinptiori. The performance of a caching strategy at a file server is strongly influenced by the presence of client caches since these caches alter the characteristics of the strecim of requests that reaches the server. This paper presents the results of a n investigation of the effect of client c(ic1iing on the nature of the server workload as a step towards understanding the performance of cacliing strategies at the server. The results demonstrate that client caches alter workload characteristics in a way that will have a profound impact on server cache performance, and suggest worthwhile directions for future developinerit of server caching strategies.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.