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Peer-to-Peer media streaming service has gained tremendous momentum in recent years. However, a number of challenges in Peer-to-Peer media streaming have not been addressed. In this paper, we propose a peer-to-peer substrate for supplying on-demand media streaming service, called Honeycomb, which mainly addresses on the key technical issue of: constructing a locality-aware P2P overlay network with high scalability and manageability. Honeycomb can fully utilize the locality of underlying physical network so that the bandwidth consumption used for the overlay maintenance can be effectively saved and the QoS requirements for delivering media content can be easily satisfied. [ABSTRACT FROM AUTHOR]

A DVE system provides a computer-generated virtual world where individuals located at different places could interact with each other. In this paper, we present the design of a grid-enabled service oriented framework for facilitating the building of DVE systems on Grid. A service component named "gamelet" is proposed. Each gamelet is characterized by its load awareness, high mobility, and embedded synchronization. Based on gamelet, we show how to re-design the existing monopolistic model of a DVE system into an open and service-oriented system that can fit into current Grid/OGSA framework. We also demonstrate an adaptive gamelet load-balancing (AGL) algorithm that helps the DVE system achieve better performance. We evaluate the performance through a multiplayer online game prototype implemented on Globus Toolkit. Results show that our approach can achieve faster response time and higher throughput. [ABSTRACT FROM AUTHOR]

We design and implement a high availability parallel run-time system—ChaRM64, a Checkpoint- based Rollback Recovery and Migration system for parallel running programs on a cluster of IA-64 computers. At first, we discuss our solution of a user-level, single process checkpoint/recovery library running on IA-64 systems. Based on this library, ChaRM64 is realized, which implements a user-transparent, coordinated checkpointing and rollback recovery (CRR) mechanism, quasi-asynchronous migration and the dynamic reconfiguration function. Owing to the above techniques and efficient error detection, ChaRM64 can handle cluster node crashes and hardware transient faults in a IA-64 cluster. Now ChaRM64 for PVM has been implemented in Linux and the MPI version is under construction. As we know, there are few similar projects accomplished for IA-64 architecture. [ABSTRACT FROM AUTHOR]