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IEEE International Conference on Communications

作者： Yu Gu Yusheng Ji Jie Li Biao Han Baohua Zhao Information Systems Architecture Science Research Division National Institute of Informatics Department of Computer Science University of Tsukuba Tsukuba Science City State Key Laboratory of Networking and Switching Technology

ISBN: (纸本)9781457720529

This paper exploits sink mobility to prolong the network lifetime in wireless sensor networks (WSNs) where the information delay caused by moving the sink should be bounded. We build a unified framework for analyzing this joint sink mobility and routing problem. We offer a mathematical modeling that is general and captures diversified issues, e.g. sink mobility, routing, delay, etc. We discuss the induced subproblems and present efficient solutions for them. Then, we generalize these solutions and propose a polynomial-time optimal algorithm for the origin problem. In simulations, we show the benefits of involving a mobile sink. We also show that the impact of the delay bound on the network lifetime.

关键词： Sinks Wireless sensor networks Routing Problem mobility mathematical modeling

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Fault-tolerant middleware based on multistream pipeline for private storage services

Fault-tolerant middleware based on multistream pipeline for ...

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International Conference for Internet Technology and Secured Transactions (ICITST)

作者： J. L. Gonzalez Victor Sosa-Sosa Borja Bergua Luis Miguel Sanchez Jesus Carretero Information Technology Laboratory Center of Research CINVESTAV Ciudad Cd. Valles Institute of Technology Victoria Mexico Computer Architecture and Technology Area Computer Science. Department UNIVERSLDAD CARLOS III Madrid Spain

This paper presents a fault-tolerant middleware for private storage services based on a client-server model. A client-side API split files into redundant chunks, which are encoded/decoded, anonymized, and distributed to different storage locations in parallel by using multistream pipeline. A chunk placement engine on the server-side API receives/delivers chunks from/to the client side API. In this model, the user preserves her files in-house and achieves data availability anytime from anywhere even in site failure scenarios while the organizations preserves the control of their storage resources. The experimental evaluation reveals the middleware can compensate the overhead produced on the client side by taking advantage of multiple cores commonly found in user's devices. The users observe that the middleware produces similar performance to the private and public file hosting systems tested in the evaluation. The organizations observe a significant reduction of work in their servers. In site disaster scenarios, the middleware yields even better performance than fault-tolerant online distributed solutions tested in the evaluation.

关键词： Pipelines Organizations Servers Libraries Sockets Measurement

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A clustering-based scheme for concurrent trace in debugging NoC-based multicore systems 12

A clustering-based scheme for concurrent trace in debugging ...

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Design, Automation and Test in Europe Conference and Exhibition

作者： Jianliang Gao Jianxin Wang Yinhe Han Lei Zhang Xiaowei Li School of Information Science and Engineering Central South University China Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences China

ISBN: (纸本)9783981080186

Concurrent trace is an emerging challenge when debugging multicore systems. In concurrent trace, trace buffer becomes a bottleneck since all trace sources try to access it simultaneously. In addition, the on-chip interconnection fabric is extremely high hardware cost for the distributed trace signals. In this paper, we propose a clustering-based scheme which implements concurrent trace for debugging Network-on-Chip (NoC) based multicore systems. In the proposed scheme, a unified communication framework eliminates the requirement for interconnection fabric which is only used during debugging. With clustering scheme, multiple concurrent trace sources can access distributed trace buffer via NoC under bandwidth constraint. We evaluate the proposed scheme using Booksim and the results show the effectiveness of the proposed scheme.

关键词： Multicore processing Bandwidth Fabrics Debugging Clustering algorithms Real time systems System-on-a-chip

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Theoretical Treatment of Target Coverage in Wireless Sensor Networks

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Journal of computer science & Technology 2011年第1期26卷 117-129页

作者：谷雨赵保华计宇生李颉 School of Computer Science University of Science and Technology of China State Key Laboratory of Networking and Switching Technology Information Systems Architecture Science Research Division National Institute of InformaticsTokyoJapan Department of Computer Science University of TsukubaTsukuba Science CityIbarakiJapan

The target coverage is an important yet challenging problem in wireless sensor networks, especially when both coverage and energy constraints should be taken into account. Due to its nonlinear nature, previous studies of this problem have mainly focused on heuristic algorithms; the theoretical bound remains unknown. Moreover, the most popular method used in the previous literature, i.e., discretization of continuous time, has yet to be justified. This paper fills in these gaps with two theoretical results. The first one is a formal justification for the method. We use a simple example to illustrate the procedure of transforming a solution in time domain into a corresponding solution in the pattern domain with the same network lifetime and obtain two key observations. After that, we formally prove these two observations and use them as the basis to justify the method. The second result is an algorithm that can guarantee the network lifetime to be at least （1 - ε） of the optimal network lifetime, where ε can be made arbitrarily small depending on the required precision. The algorithm is based on the column generation （CG） theory, which decomposes the original problem into two sub-problems and iteratively solves them in a way that approaches the optimal solution. Moreover, we developed several constructive approaches to further optimize the algorithm. Numerical results verify the efficiency of our CG-based algorithm.

关键词： target coverage wireless sensor networks time-dependent solution pattern-based solution column generation

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Editorial: Special issue dedicated to ICFP 2010

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Journal of Functional Programming 2012年第4-5期22卷 379-381页

作者： UMUT A. ACAR JAMES CHENEY STEPHANIE WEIRICH Programming Languages and Systems Group Max Planck Institute for Software Systems Germany (e-mail: umut@***) Laboratory for Foundations of Computer Science University of Edinburgh Edinburgh UK (e-mail: jcheney@inf.ed.ac.uk) School of Engineering and Applied Science University of Pennsylvania Philadelphia PA 19104 USA (e-mail: sweirich@cis.upenn.edu)

The 15th ACM SIGPLAN International Conference on Functional Programming (ICFP) took place on September 27–29, 2010 in Baltimore, Maryland. After the conference, the programme committee, chaired by Stephanie Weirich, selected several outstanding papers and invited their authors to submit to this special issue of Journal of Functional Programming. Umut A. Acar and James Cheney acted as editors for these submissions. This issue includes the seven accepted papers, each of which provides substantial new material beyond the original conference version. The selected papers reflect a consensus by the program committee that ICFP 2010 had a number of strong papers that link core functional programming ideas with other areas, such as multicore, embedded systems, and data compression.

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Virtual resource monitoring in cloud computing

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Journal of Shanghai University(English Edition) 2011年第5期15卷 381-385页

作者：韩芳芳彭俊杰张武李青李建敦江钦龙袁勤 School of Computer Engineering and Science Shanghai University Key Laboratory of Computer System and Architecture Institute of Computing TechnologyChinese Academy of Science

Cloud computing is a new computing model. The resource monitoring tools are immature compared to traditional distributed computing and grid computing. In order to better monitor the virtual resource in cloud computing, a periodically and event-driven push （PEP） monitoring model is proposed. Taking advantage of the push and event-driven mechanism, the model can provide comparatively adequate information about usage and status of the resources. It can simplify the communication between Master and Work Nodes without missing the important issues happened during the push interval. Besides, we develop ＂mon＂ to make up for the deficiency of Libvirt in monitoring of virtual CPU and memory.

关键词： virtual resource monitoring cloud computing virtualization

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BOFAR: Buffer occupancy factor based adaptive router for mesh NoCs

BOFAR: Buffer occupancy factor based adaptive router for mes...

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4th International Workshop on Network on Chip architectures, NoCArc 2011, in Conjunction with the 44th Annual IEEE/ACM International Symposium on Microarchitecture, MICRO44

作者： Jose, John Shankar, J. Shiva Mahathi, K.V. Kumar, Damarla Kranthi Mutyam, Madhu Computer Architecture and Systems Laboratory Department of Computer Science and Engineering Indian Institute of Technology Madras Chennai-36 India

ISBN: (纸本)9781450309479

If the route computation operation in an adaptive router returns more than one output channels, the selection strategy chooses one from them based on the congestion metric used. The effectiveness of a selection strategy depends on what metric is used to identify congestion and how precisely that metric captures the actual congestion. The number of cycles a flit stays in a router is a direct indication of the contention level of the output port it desires to move out. We propose buffer Occupancy Factor based Adaptive Router (BOFAR), wherein the history of cycles spent by flits in buffers is used as the congestion metric. BOFAR outperforms the baseline architectures built on minimal odd-even adaptive router model with conventional selection strategies like count of free downstream virtual channels at reachable neighbors, and fluidity of buffers in downstream neighbors. Our experiments on 4x4 mesh NoC with various synthetic traffic patterns show that BOFAR exceeds the performance of best baseline adaptive router with 21% average and 78% maximum latency reduction at saturation load. The reduced average packet latency, increased buffer fluidity fairness, and increased saturation point of BOFAR with minimal overhead in area, power, and wiring makes it a promising alternative to existing adaptive routers in mesh NoCs. © 2011 ACM.

关键词： Network-on-chip

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Building algorithmically nonstop fault tolerant MPI programs

Building algorithmically nonstop fault tolerant MPI programs

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18th International Conference on High Performance Computing, HiPC 2011

作者： Wang, Rui Yao, Erlin Chen, Mingyu Tan, Guangming Balaji, Pavan Buntinas, Darius State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences China Mathematics and Computer Science Argonne National Laboratory United States

ISBN: (纸本)9781457719516

With the growing scale of high-performance computing (HPC) systems, today and more so tomorrow, faults are a norm rather than an exception. HPC applications typically tolerate fail-stop failures under the stop-and-wait scheme, where even if only one processor fails, the whole system has to stop and wait for the recovery of the corrupted data. It is now a more-or-less accepted fact that the stop-and-wait scheme will not scale to the next generation of HPC systems. Inspired by the previous stop-and-wait algorithm-based fault tolerance (ABFT) recovery technique, we propose in this paper a nonstop fault tolerance scheme at the application level and describe its implementation. When failure occurs during the execution of applications, we do not stop to wait for the recovery of the corrupted node;instead, we replace it with the corresponding redundant node and continue the execution. At the end of execution, the correct solution can be recovered algorithmically at a very low cost. In order to implement the scheme, some new fault-tolerant features of the Message Passing Interface (MPI) have been investigated and utilized in the MPICH implementation of MPI. We also describe a case study using High Performance Linpack (HPL) with these new features and evaluate the performance of both our new scheme and ABFT recovery. Experimental results show the advantage of our new scheme over ABFT recovery even in a small scale. © 2011 IEEE.

关键词： Message passing

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Fast implementation of DGEMM on Fermi GPU

Fast implementation of DGEMM on Fermi GPU

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2011 International Conference for High Performance Computing, Networking, Storage and Analysis, SC11

作者： Tan, Guangming Li, Linchuan Triechle, Sean Phillips, Everett Bao, Yungang Sun, Ninghui Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Science China Nvidia Corporation China

ISBN: (纸本)9781450307710

In this paper we present a thorough experience on tuning double-precision matrix-matrix multiplication (DGEMM) on the Fermi GPU architecture. We choose an optimal algorithm with blocking in both shared memory and registers to satisfy the constraints of the Fermi memory hierarchy. Our optimization strategy is further guided by a performance modeling based on micro-architecture benchmarks. Our optimizations include software pipelining, use of vector memory operations, and instruction scheduling. Our best CUDA algorithm achieves comparable performance with the latest CUBLAS library1. We further improve upon this with an implementation in the native machine language, leading to 20% increase in performance. That is, the achieved peak performance (efficiency) is improved from 302Gflop/s (58%) to 362Gflop/s (70%). Copyright 2011 ACM.

关键词： Graphics processing unit

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Three-dimensional hierarchical microbattery electrodes for tunable high energy and power density batteries

Three-dimensional hierarchical microbattery electrodes for t...

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2012 Solid-State Sensors, Actuators and Microsystems Workshop, Hilton Head 2012

作者： Gerasopoulos, K. Pomerantseva, E. Brown, A. Wang, C. Culver, J. McCarthy, M. Ghodssi, R. MEMS Sensors and Actuators Laboratory Institute for Systems Research University of Maryland College ParkMD20742 United States Department of Electrical and Computer Engineering University of Maryland College ParkMD20742 United States Department of Materials Science and Engineering University of Maryland College ParkMD20742 United States Department of Plant Sciences and Landscape Architecture University of Maryland College ParkMD20742 United States Department of Chemical and Biomolecular Engineering University of Maryland College ParkMD20742 United States Department of Mechanical Engineering and Mechanics Drexel University PhiladelphiaPA19104 United States

ISBN: (纸本)9780964002494

We present a novel approach for the fabrication of hierarchical electrodes that integrates bottom-up nanostructure self-assembly and top-down microfabrication processes. The electrodes consist of virus-templated nanostructures self-assembled on three-dimensional micropillars. Active battery material (V2O5) is conformally deposited using atomic layer deposition (ALD) on the hierarchical micro/nano network. Electrochemical testing of these electrodes indicates a 3-fold increase in energy density compared to nanostructures alone, while maintaining the high power characteristics. Investigation of capacity scaling for varying active material thickness reveals underlying limitations and highlights the importance of our method in controlling both energy and power density with structural hierarchy. © 2012 TRF.

关键词： Actuators

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