Tiziana Ferrari

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Current resource reservation architectures for multimedia networks do not scale well for a large number of ows. We propose a new architecture that automatically aggregates ows on each link in the network. Therefore, the network has no knowledge of individual ows. There is no explicit signalling protocol, and the protocol overhead mainly consists in the(More)
The differentiated services (diffserv) architecture defines a new framework for the support of quality of service (QoS) in IP-based networks. In this paper, we focus on the mechanisms used to implement the Expedited Forwarding (EF) Per-Hop Behavior (PHB). We analyze these mechanisms with respect to two main QoS parameters: Delay and delay variation. Within(More)
Resource-sharing is one of the grid intrinsic properties enabling efficient usage of services by clients from many virtual organizations. In such an environment, the provisioning of quality of service requires mechanisms for the control of the concurrent access to resources and services, as well as protocols for the establishment of service level agreements(More)
Many Grid architectures have been developed in recent years. These range from the large community Grids such as LHG and EGEE to single site deployments such as Condor. However, these Grid architectures have tended to focus on the execution of executables. Application scientists are now seeking to deploy their entire workflows onto these Grids, which will(More)
Contemporary Grids are characterized by a middleware that provides the necessary virtualization of computation and data resources for the shared working environment of the Grid. In a large-scale view, different middleware technologies and implementations have to coexist. The SOA approach provides the needed architectural backbone for interoperable(More)
Grid workload management and scheduling enable the efficient distribution of tasks in Grid systems and allow their transparent execution by hiding the complexity of the Grid infrastructure at the fabric layer. We propose an approach to workload management and scheduling that aims at optimizing resource utilization (some optimization criteria are discussed).(More)
The provisioning of end-to-end services in presence of traffic aggregation is evaluated in the framework of the Differentiated Services QoS architecture. The effect of stream multiplexing on delay and jitter-sensitive traffic is analyzed through an experimental approach. Aggregation is evaluated in three different scenarios: with different aggregate traffic(More)
A new resource abstraction called Path is introduced in the framework of resource reservation for the optimization of user applications. A network Path is allocated in an on-demand fashion using a number of different signaling methods and is built using a chain of Path Elements that may belong to different administrative domains. Three different(More)