Euro-Link SM Performance

Euro-Link engineers and researchers are working with Europeans and US collaborators to optimize end-to-end performance such that tens of Mbps are realized to the desktop. Specifically, application-level network performance analysis tools are being developed at the Electronic Visualization Laboratory (EVL) to help next-generation networks meet the high-bandwidth, quality-of-service (QoS) and connectivity needs of academic researchers running high-performance scientific applications.

We are adopting and adapting emerging network performance monitoring technologies, and developing advanced visualization, persistent databases and visualization/VR techniques to create new applications-oriented performance measuring tools. Examples of this work are detailed below.

Network QoS of Real-Time Multimedia
The EVL-developed QoSIMoTo Internet Monitoring Tool was released on the web for IRIX and Linux in fall 1999. QoSIMoTo is a program to view, in real-time, latency, bandwidth and jitter of multiple flows in Netlogger format. The program runs in the CAVEŽ, and on SGI desktop workstations and Linux PCs running in CAVE-simulator mode.

Network Monitoring
Netlogger-formatted network monitoring has been integrated into CAVERNsoft G2, the EVL-developed C++ toolkit for building collaborative, networked virtual reality applications. CAVERNsoft G2 has low- and mid-level networking classes to support general collaborative application building, and higher-level modules to specifically support tele-immersion. It is designed to enable the rapid construction of tele-immersive applications, to equip previously single-user applications with tele-immersive capabilities, and to provide a testbed for research in tele-immersion.

Low Latency State Transmission Over Long Distance Networks
We are implementing a packet-level Forward Error Correction scheme; both parity-based and XOR-based. The goal is to develop an alternative to TCP for transmitting real-time data, which has substantial latency over international links.

Petri-Net Network Modeling
We are investigating building higher-level Petri-Net models of the audio and video data sent over networks during typical tele-immersive sessions. As a test case to determine if these models can accurately predict network utilization and behavior, EVL wants to apply these models to the AccessBot, a data-intensive, high-bandwidth and high fidelity video-streaming application that is currently maintaining a persistent connection between Chicago and the NCSA ACCESS Center in Washington, DC.

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