Marjory J. Johnson

Learn More
Communication technology now makes it possible to support high data transmission rates at relatively low cost. In particular, optical fiber can be used as the medium in local area networks with data rates in the range of 100 megabits per second. Unfortunately, local area network topologies and communication protocols that work well with lower speed media(More)
Currently there is no control for real-time traffic sources in IP networks. This is a serious problem because real-time traffic can not only congest the network but can also cause unfairness and starvation of TCP traffic. In this paper, a new rate control scheme, RCS, is introduced for real-time traffic in networks with high bandwidth-delay products and(More)
This paper describes an experiment to prototype a new way of conducting science by applying networking and distributed computing technologies to an Earth Science application. A combination of satellite, wireless, and terrestrial networking provided geologists at a remote field site with interactive access to supercomputer facilities at two NASA centers,(More)
Development of the Next Generation Internet requires the development of revolutionary applications as well as advances in networking technologies. This paper presents experiences in using the NREN testbed to prototype a col-laborative medical-imaging application. Technological requirements for this application include high-bandwidth reliable multicast and(More)
This paper introduces the hardware architecture for the BeSTGRID (Broadband Enabled Science and Technology GRID) supercomputer system. This system is a high performance cluster supercomputer with infiniband interconnect. The system has been benchmarked for compute and file IO and is shown to be scalable. The infiniband interconnect provides high bandwidth,(More)
This short paper compares the performance between a InfiniBand based Cluster and an older Gigabit-based cluster. The InfiniBand interconnect provides high bandwidth, low latency links between both compute nodes and storage system which gives good parallel scalability. The linpack benchmark scales linearly up to the full 208 processors. Although InfiniBand(More)