École Polytechnique Fédérale de Lausanne
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Experimental evaluation results of an advanced DHT-based peer-to-peer system
Get PDFP-Grid is a decentralized DHT-based peer-to-peer system with logarithmic search complexity. As it is intended to provide a platform for distributed information management beyond mere file-sharing it supports an update functionality with lazy consistency guarantees, identity management disentangling the DHT from the underlying networking infrastructure, and decentralized load balancing. In this paper we first give a brief overview of the theoretical foundations of P-Grid and the supporting functionalities. Then we highlight some interesting implementation details and present briefly some experimental evaluation results. To our knowledge this is one of the first reports on experimental evaluation results of a structured peer-to-peer system in a real-world networking environment.LSI
GridVine: Building Internet-Scale Semantic Overlay Networks
No full textThis paper addresses the problem of building scalable semantic overlay networks. Our approach follows the principle of data independence by separating a logical layer, the semantic overlay for managing and mapping data and metadata schemas, from a physical layer consisting of a structured peer-to-peer overlay network for e±cient routing of messages. The physical layer is used to implement various functions at the logical layer, including attribute-based search, schema management and schema mapping management. The separation of a physical from a logical layer allows us to process logical operations in the semantic overlay using di®erent physical execution strategies. In particular we identify iterative and recursive strategies for the traversal of semantic overlay networks as two important alternatives. At the logical layer we support semantic interoperability through schema inheritance and semantic gossiping. Thus our system provides a complete solution to the implementation of semantic overlay networks supporting both scalability and interoperability.LSI
NoC Emulation on FPGA: HW/SW Synergy for NoC Features Exploration
Get PDFCurrent Systems-On-Chip (SoC) execute applications that demand extensive parallel processing. Networks-On-Chip (NoC) provide a structured way of realizing interconnections on silicon, and obviate the limitations of bus-based solution. NoCs can have regular or ad hoc topologies, and functional validation is essential to assess their correctness and performance. In this paper, we present a flexible emulation environment implemented on an FPGA that is suitable to explore, evaluate and compare a wide range of NoC solutions with a very limited effort. We also present an automated way to perform NoC features exploration using the interaction HW/SW on an FPGA. Our experimental results show a speed-up of four orders of magnitude with respect to cycleaccurate HDL simulation, while retaining cycle accuracy. With our emulation framework, designers can explore and optimize a various range of solutions, as well as characterize quickly performance figures.LSI1ES
Mathematical and Numerical Filtration-Advection-Dispersion Model of Miscible Grout Propagation in Saturated Porous Media
No full textLMRLMSSol
