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performance evaluation of a hybrid wireless network architecture for rural communication

Performance evaluation of a hybrid wireless network architec...

引用

7th IEEE International Conference on Personal Wireless Communications, ICPWC 2005

作者： Balaji, K. Hegde, N. Venkata Ramana, B. Manoj, B.S. Siva Ram Murthy, C. High Performance Computing and Networking Laboratory Department of Computer Science and Engineering IIT Madras 600036 India

In this paper, we evaluate the performance of Meghadoot - a packet based wireless mesh network architecture for low cost rural community networks. Meghadoot is designed for rural community networks as an alternative for the single-hop last mile. We have built a prototype network for Meghadoot architecture and studied the impact of multi-hop relaying and constrained devices on end-to-end throughput. The experimental results show that in certain situations multi-hop last mile improves performance in addition to the enhanced coverage and also the presence of constrained nodes brings down the performance drastically. ©2005 IEEE.

关键词： Wireless telecommunication systems

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performance evaluation of a hybrid wireless network architecture for rural communication

Performance evaluation of a hybrid wireless network architec...

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IEEE International Conference on Personal Wireless Communication

作者： K. Balaji N. Hegde B.V. Ramana B.S. Manoj C.S.R. Murthy High Performance Computing and Networking Laboratory Department of Computer Science and Engineering IIT-Madras India

In this paper, we evaluate the performance of Meghadoot - a packet based wireless mesh network architecture for low cost rural community networks. Meghadoot is designed for rural community networks as an alternative for the single-hop last mile. We have built a prototype network for the Meghadoot architecture and studied the impact of multi-hop relaying and constrained devices on end-to-end throughput. The experimental results show that in certain situations multi-hop last mile improves performance in addition to the enhanced coverage and also the presence of constrained nodes brings down the performance drastically.

关键词： Wireless networks Costs Educational institutions Computer architecture Wireless mesh networks Relays Bandwidth Wireless LAN high performance computing Laboratories

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Load balancing in distributed applications based on extremal optimization 1

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16th European Conference on Applications of Evolutionary Computation, EvoApplications 2013

作者： De Falco, Ivanoe Laskowski, Eryk Olejnik, Richard Scafuri, Umberto Tarantino, Ernesto Tudruj, Marek Institute of High Performance Computing and Networking CNR Naples Italy Institute of Computer Science Polish Academy of Sciences Warsaw Poland Computer Science Laboratory University of Science and Technology of Lille France Polish-Japanese Institute of Information Technology Warsaw Poland

ISBN: (数字)9783642371929

ISBN: (纸本)9783642371912

The paper shows how to use Extremal Optimization in load balancing of distributed applications executed in clusters of multicore processors interconnected by a message passing network. Composed of iterative optimization phases which improve program task placement on processors, the proposed load balancing method discovers dynamically the candidates for migration with the use of an Extremal Optimization algorithm and a special quality model which takes into account the computation and communication parameters of the constituent parallel tasks. Assessed by experiments with simulated load balancing of distributed program graphs, a comparison of the proposed Extremal Optimization approach against a deterministic approach based on a similar load balancing theoretical model is provided. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Message passing

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Supervised classification of distributed data streams for smart grids

Supervised classification of distributed data streams for sm...

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作者： Guarracino, Mario R. Irpino, Antonio Radziukyniene, Neringa Verde, Rosanna High Performance Computing and Networking-National Research Council of Italy Naples Italy Dipartimento di Studi Europei e Mediterranei Seconda Universitá Degli Studi di Napoli Caserta Italy Laboratory of Systems Control and Automation Lithuanian Energy Institute Kaunas Lithuania

The electricity system inherited from the 19th and 20th centuries has been a reliable but centralized system. With the spreading of local, distributed and intermittent renewable energy resources, top-down central control of the grid no longer meets modern requirements. For these reasons, the power grid has been equipped with smart meters integrating bi-directional communications, advanced power measurement and management capabilities. Smart meters make it possible to remotely turn power on or off to a customer, read usage information, detect a service outage and the unauthorized use of electricity. To fully exploit their capabilities, we foresee the usage of distributed supervised classification algorithms. By gathering data available from meters and other sensors, such algorithms can create local classification models for attack detection, online monitoring, privacy preservation, workload balancing, prediction of energy demand and incoming faults. In this paper we present a decentralized distributed classification algorithm based on proximal support vector machines. The method uses partial knowledge, in form of data streams, to build its local model on each meter. We demonstrate the performance of the proposed scheme on synthetic datasets. © 2012 Springer-Verlag.

关键词： Supervised learning

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Architecture of LA-MPI, a network-fault-tolerant MPI

Architecture of LA-MPI, a network-fault-tolerant MPI

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： R.T. Aulwes D.J. Daniel N.N. Desai R.L. Graham L.D. Risinger M.A. Taylor T.S. Woodall M.W. Sukalski Advanced Computing Laboratory Los Alamos National Laboratory Los Alamos NM USA High Performance Computing and Networking Research Sandia National Laboratories Livermore CA USA

Summary form only given. We discuss the unique architectural elements of the Los Alamos message passing interface (LA-MPI), a high-performance, network-fault-tolerant, thread-safe MPI library. LA-MPI is designed for use on terascale clusters which are inherently unreliable due to their sheer number of system components and trade-offs between cost and performance. We examine in detail the design concepts used to implement LA-MPI. These include reliability features, such as application-level checksumming, message retransmission, and automatic message rerouting. Other key performance enhancing features, such as concurrent message routing over multiple, diverse network adapters and protocols, and communication-specific optimizations (e.g., shared memory) are examined.

关键词： Fault tolerance Laboratories Message passing Application software high performance computing Libraries Telecommunication network reliability Fault tolerant systems Protocols Computer architecture

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Implementation of a Cyber Transformer for Parallel Download in Co-allocation Data Grid Environments

Implementation of a Cyber Transformer for Parallel Download ...

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第七届网格与协同计算国际会议(Seventh International Conference on Grid and Cooperative computing GCC 2008)

作者： Ming-Feng Yang Chao-Tung Yang Wen-Chung Chiang High-Performance Computing Laboratory Department of Computer Science and Information Engineering Tun Department of Information Networking Technology Hsiuping Institute of Technology Taichung County T

ISBN: (纸本)9781424432806

In data grid, co-allocation architecture was developed to enable parallel transferring of files from multiple replicas stored in the different servers. Several dynamic file transfer strategies based on coallocation model have been proposed and used to exploit the different transfer rates among various client-server links and to address dynamic rate fluctuations by dividing files into multiple blocks of equal sizes. These schemes, which used for concurrently downloading a file from multiple replicas stored in multiple servers, overcome the obstacle of transfer performance due to idle waiting time of faster servers in co-allocation based file transfers and therefore, provide reduced file transfer time. In this paper, a tool with user friendly interface, called Cyber Transformer, is implemented and used to manage file replications and download files on data grid environments in parallel. This tool integrates eight methods including the previous and our proposed algorithms. Experimental results show that Cyber Transformer can obtain high-performance file transfer speed and reduce the time cost of parallel download.

关键词： Web server Network servers Environmental management Distributed computing Bandwidth Internet Grid computing File servers Resource management Computer networks

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Dynamics of Mathematical Models in Biology 1

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1000年

作者： Alessandra Rogato Valeria Zazzu Mario Guarracino

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TNT10G: A high-accuracy 10 GbE traffic player and recorder for multi-Terabyte traces

TNT10G: A high-accuracy 10 GbE traffic player and recorder f...

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2014 International Conference on Reconfigurable computing and FPGAs, ReConFig 2014

作者： Zazo, Jose Fernando Forconesi, Marco Lopez-Buedo, Sergio Sutter, Gustavo Aracil, Javier NAUDIT HPCN Calle Faraday 7 Madrid28049 Spain Computer Laboratory University of Cambridge 15 JJ Thomson Avenue CambridgeCB3 0FD United Kingdom High-Performance Computing and Networking Research Group Universidad Autonoma de Madrid Ciudad Universitaria de Cantoblanco Madrid28049 Spain

ISBN: (纸本)9781479959440

In this paper we present TNT10G (multi-Terabyte trace Network Tester), an FPGA-based tool for replaying and capturing massive Ethernet traces at 10 Gb/s. The tool is capable of reproducing and storing terabytes of network traffic at line rate, even if small packets are being used. Moreover, since the design works at low level (XGMII), accuracy is better than 10 ns, and it is also possible to observe and generate anomalous conditions, such as malformed frames, FCS errors, or illegal inter-frame gaps. All such features make TNT10G a truly useful tool for network testing and monitoring at 10 Gb/s. The design uses the NetFPGA-10G platform, although it could be easily ported to other boards since it uses standard AXI buses. The key element to achieve line-rate operation is a custom-developed Linux driver, which works in conjunction with a high-speed DMA backend core from Northwest Logic. Such blocks, together with a RAID0 array of commodity SSD disks, enable operation at 10 Gb/s. Finally, the use of a low-cost academic board together with off-the-shelf components allows for an open, extensible and cost-effective solution, a unique combination not found in commercial products. © 2014 IEEE.

关键词： Field programmable gate arrays (FPGA)

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A PCIe DMA engine to support the virtualization of 40 Gbps FPGA-accelerated network appliances

A PCIe DMA engine to support the virtualization of 40 Gbps F...

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International Conference on ReConFigurable computing and FPGAs, ReConFig 2015

作者： Zazo, Jose Fernando Lopez-Buedo, Sergio Audzevich, Yury Moore, Andrew W. NAUDIT HPCN Calle Faraday 7 Madrid28049 Spain High-Performance Computing and Networking Research Group Universidad Autonoma de Madrid Ciudad Universitaria de Cantoblanco Madrid28049 Spain Computer Laboratory University of Cambridge 15 JJ Thomson Avenue CambridgeCB3 0FD United Kingdom

ISBN: (纸本)9781467394062

Network Function Virtualization (NFV) allows creating specialized network appliances out of general-purpose computing equipment (servers, storage, and switches). In this paper we present a PCIe DMA engine that allows boosting the performance of virtual network appliances by using FPGA accelerators. Two key technologies are demonstrated, SR-IOV and PCI Passthrough. Using these two technologies, a single FPGA board can accelerate several virtual software appliances. The final goal is, in an NFV scenario, to substitute conventional Ethernet NICs by networking FPGA boards (such as NetFPGA SUME). The advantage of this approach is that FPGAs can very efficiently implement many networking tasks, thus boosting the performance of virtual networking appliances. The SR-IOV capable PCIe DMA engine presented in this work, as well as its associated driver, are key elements in achieving this goal of using FPGA networking boards instead of conventional NICs. Both DMA engine and driver are open source, and target the Xilinx 7-Series and UltraScale PCIe Gen3 endpoint. The design has been tested on a NetFPGA SUME board, offering transfer rates reaching 50 Gb/s for bulk transmissions. By taking advantage of SR-IOV and PCI Passthrough technologies, our DMA engine provides transfers rate well above 40 Gb/s for data transmissions from the FPGA to a virtual machine. We have also identified the bottlenecks in the use of virtualized FPGA accelerators caused by reductions in the maximum read request size and maximum payload PCIe parameters. Finally, the DMA engine presented in this paper is a very compact design, using just 2% of a Xilinx Virtex-7 XC7VX690T device. © 2015 IEEE.

关键词： Field programmable gate arrays (FPGA)

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MIFAS: Medical Image File Accessing System in Co-allocation Data Grids

MIFAS: Medical Image File Accessing System in Co-allocation ...

引用

IEEE Asia-Pacific Conference on Services computing (APSCC)

作者： Chao-Tung Yang Chiu-Hsiung Chen Ming-Feng Yang Wen-Chung Chiang High-Performance Computing Laboratory Department of Computer Science and Information Engineering Tunghai University Taichung Taiwan Department of Information Networking Technology Hsiuping Institute of Technology Taichung Taiwan

We have encountered two challenges when using the PACS system. First, PACS users are limited to certain bandwidths and locations. Second, Web PACS machine replacement is too costly, management is difficult, and better image stability is needed. There are also speed variations for different users at different locations. For instance, radiologists use medical image workstations with direct access to the PACS information system and so have a greater speed for querying and file retrieval. Physicians, on the other hand, use web browsers with no direct access to the PACS information system, which leads to slower network speeds. Physicians also affect one another in overall network speed by processing queries and file retrievals via Web browser. There are also insufficient network bandwidth concerns. These often arise when exchanging medical images with other hospitals or downloading large numbers of images. Since these large file volumes are transferred via WANs, insufficient network bandwidths limit upload and download speeds. And if the Web PACS breaks down, the hospital must ask professional engineers for replacements, and spend large amounts of money about a NT$ million or more per unit. This is not only troublesome for system managers, but also costly for the hospital.

关键词： Biomedical imaging Picture archiving and communication systems Bandwidth Hospitals Stability Workstations Management information systems Information retrieval Image retrieval Information systems

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