Marcia Zangrilli

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An execution environment consisting of virtual machines (VMs) interconnected with a virtual overlay network can use the naturally occurring traffic of an existing, unmodified application running in the VMs to measure the underlying physical network. Based on these characterizations, and characterizations of the application's own communication topology, the(More)
Adaptive grid applications require up-to-date network resource measurements and predictions to help steer their adaptation to meet performance goals. To this end, we are interested in monitoring the available bandwidth of the underlying networks in the most accurate and least obtrusive way. Bandwidth is either measured by actively injecting data probes into(More)
Communications systems, encompassing VoIP, IM, and other personal media, present different challenges for P2P environments than other P2P applications. In particular, reliable communication implies that each resource (person) is unique and must be reliably located, without false negatives. Because of their prevalence in real deployments, the overlay must(More)
Distributed applications require timely network measurements so that they can adapt to changing network conditions and make efficient use of grid resources. One of the key issues in obtaining network measurements is the intru-siveness of the measurements themselves—how much network performance is " wasted " taking the measurements? Our goal is to combine(More)
While several algorithms have been created to actively measure the end-to-end available bandwidth of a network path, they require instrumentation at both ends of the path, and the traffic injected by these algorithms may affect the performance of other applications on the path. Our goal is to apply the self-induced congestion principle to passive traces of(More)
Grid services have tremendously simplified the programming challenges in leveraging large-scale distributed computing. At the same time, the increased level of abstraction reduces the opportunities available to the application for optimizing its performance by monitoring the system. In this paper we introduce a monitoring grid services proxy, which(More)
This paper describes our progress in creating a case study on optimistic computing for the Grid using parallel mesh generation. For the implementation of both methods we will be using a Portable Runtime Environment for Mobile Applications (PREMA) which is extended to provide support for optimistic control using grid performance monitoring and prediction.(More)
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