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Routing-contained virtualization based on Up*/down* forwarding

14th International Conference on High-Performance Computing, HiPC 2007

作者： Solheim, Åshild Grønstad Lysne, Olav Sødring, Thomas Skeie, Tor Libak, Jakob Aleksander Networks and Distributed Systems Group Simula Research Laboratory Lysaker Norway Department of Informatics University of Oslo Oslo Norway

ISBN: (纸本)9783540772194

Virtualization of computing resources is becoming increasingly important both for high-end servers and multi-core CPUs. In a virtualized system, the set of resources that constitute a virtual compute entity should be spatially separated from each other. Dividing the cores on a chip, or the CPUs in a high end server into disjoint sets for each task is a trivial problem. Ensuring that they use disjoint parts of the interconnection network is, however, complex, and in existing methods the requirement of routing-containment of each virtual partition severely degrades the utilization of the system. In this paper, we present an allocation strategy that is based on Up*/Down* routing. Through simulations, we demonstrate increases (in some cases above 30%) in system utilizar tion relative to state-of-the-art in a Dimension Order routed mesh - a topology that is assumed to be widely deployed in networks on Chip. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Program processors

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Learning traffic light phase schedules from velocity profiles in the cloud

Learning traffic light phase schedules from velocity profile...

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2012 5th International Conference on New Technologies, Mobility and Security, NTMS 2012

作者： Kerper, Markus Wewetzer, Christian Sasse, Andreas Mauve, Martin Driver Information Systems Research Volkswagen Group Germany Computer Networks Group University of Düsseldorf Germany

ISBN: (纸本)9781467302296

Traffic lights strongly impact vehicle movement and fuel consumption in cities. If drivers were aware of the traffic light phase schedule, they could predict the traffic light state at arrival time and could reduce fuel consumption. To acquire information like traffic light phase schedules, our vision is that drivers share their velocity profiles in a digital cloud, and in return benefit from smart algorithms evaluating the collected data. We present one such algorithm, Traffic Light State Estimation (TLSE), that operates on the velocity profiles to backward-estimate phase schedules of traffic light signal groups operating with fixed cycle length (representing about 80% of all traffic lights in the US). We present simulation results showing that phase schedule prediction on the base of TLSE is correct more than 90% of the time. © 2012 IEEE.

关键词： Velocity

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The Inception of Electronic Digital Computing

The Inception of Electronic Digital Computing

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2024 International Conference Automatics and Informatics, ICAI 2024

作者： Getov, Vladimir S. University of Westminster Distributed and Intelligent Systems Research Group School of Computer Science and Engineering London United Kingdom

ISBN: (纸本)9798350353907

The goal of this paper is to review the first projects for building automatic computing machines during the first half of the 20th century. The presented timeline shows that 85 years ago - in October 1939 - the first breadboard proof-of-concept prototype of an electronic digital computer became operational. The credit for this revolutionary invention goes to John Vincent Atanasoff at Iowa State College. Using fresh insights and some nearly forgotten facts, we also review the origins of the IEEE computer Society and the role of organized professional activities, as well as the customer demand for spreading new ideas and design solutions for the fast-growing computer industry. The paper recognizes and explains the contribution of John Vincent Atanasoff to the invention and early development of electronic digital computing and the design of the modern computers that changed the world. © 2024 IEEE.

关键词： Digital computers

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Optimizing vibratory energy harvesters with differentiable data-driven control

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Chaos, Solitons and Fractals 2025年 198卷

作者： Al-zahrani, Mohammed S. Alsaade, Fawaz W. Alsaadi, Fuad E. Department of Computer Networks and Communications College of Computer Sciences and Information Technology King Faisal University Al-Ahsa31982 Saudi Arabia Department of Computer Science College of Computer Sciences and Information Technology King Faisal University Al-Ahsa31982 Saudi Arabia Communication Systems and Networks Research Group Department of Electrical and Computer Engineering Faculty of Engineering King Abdulaziz University Jeddah Saudi Arabia

Nonlinear vibratory energy harvesters often exhibit multiple coexisting attractors, making their control challenging and energy-intensive. Ensuring an effective transition between these attractors while minimizing control effort is crucial for maximizing power generation and maintaining system stability. This paper introduces a differentiable data-driven control strategy that optimizes energy harvester performance by leveraging a neural network (NN)-based control framework. Unlike traditional fixed-gain or surrogate modeling approaches, the proposed method directly integrates system dynamics and control power consumption into the gain adaptation process, ensuring real-time adaptability. By exploiting the differentiability of neural networks, the controller employs gradient-based optimization to continuously refine control parameters in response to changes in operating conditions. The control framework consists of an offline training phase, where the neural network learns an energy-efficient control strategy through differentiable simulations. During this phase, the neural network is trained using a large dataset of system responses to different control inputs, allowing it to learn the most energy-efficient control strategy. This trained network is then used in the online deployment phase, where the trained controller dynamically adjusts control parameters in real-time. The proposed approach minimizes control energy consumption and efficiently guides the system toward the high-energy attractor, avoiding unnecessary control effort. Our approach significantly outperforms conventional PID-based sliding mode controllers. Simulation results confirm that the differentiable controller considerably enhances energy harvesting efficiency and reduces chattering, ensuring a smooth transition to the high-energy orbit while maintaining robust system stability. The study also highlights the necessity of an adaptive control strategy, stressing the urgency of its implementation for o

关键词： Lyapunov methods

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Streaming 4K/UHD video to the rest of us: Can bandwidth sharing help? 16

Streaming 4K/UHD video to the rest of us: Can bandwidth shar...

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16th IEEE International Symposium on a World of Wireless, Mobile and Multimedia networks, WoWMoM 2015

作者： Montes, Isabel Chua, Jaymari Cruz, Michelangelo Remillano, Augusto Young, Joseph Darwin Ocampo, Roel Festin, Cedric Computer Networks Laboratory Electrical and Electronics Engineering Institute University of the Philippines Diliman Philippinese United States Networks and Distributed Systems Group Department of Computer Science University of the Philippines Diliman Philippinese United States

ISBN: (纸本)9781479984619

High quality video streaming for mobile users is difficult to achieve in some areas of the world due to poor broadband capacity and sparse network coverage. We propose a bandwidth-sharing scheme to allow users with limited uplink bandwidth to borrow idle bandwidth from nearby access points and provide these users the opportunity to experience higher quality video than what their own bandwidth could normally support. We developed a Linux kernel implementation of a multipath less-than-best-effort (MP-LBE) protocol for bandwidth scavenging and demonstrated, through testbed experiments, that video quality may be improved through bandwidth sharing. This may bring us closer to the 'video everywhere' vision even as incremental upgrades are made on broadband Internet infrastructure. © 2015 IEEE.

关键词： Video streaming

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An approach for selective beacon forwarding to improve cooperative awareness

An approach for selective beacon forwarding to improve coope...

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2010 IEEE Vehicular Networking Conference, VNC 2010

作者： Schmidt, Robert K. Lasowski, Robert Leinmüller, Tim Linnhoff-Popien, Claudia Schäfer, Günter DENSO Automotive Deutschland GmbH Germany Institute for Mobile and Distributed Systems Ludwig Maximilian University of Munich Germany Telematics/Computer Networks Research Group Technical University of Ilmenau Germany

ISBN: (纸本)9781424495252

Cooperative awareness is established by vehicles exchanging their status frequently. In situations where a high number of vehicles access the communication channel with high frequency, communication and cooperative awareness suffer from increased packet loss. So far, forwarding of beacons focuses on extending the range of V2V communication which is not necessarily needed in most scenarios. In this paper, we motivate selective beacon forwarding to improve the reliability of cooperative awareness in high load situations. We define a metric to measure the quality of cooperative awareness and compare different static beacon rates by a simulation study. Especially in high load situations, we evaluate selective forwarding of beacons to overcome the awareness degradation due to interference, leading to packet loss even at short distances. We show that our approach causes only slight overhead in terms of additional messages and that the age of forwarded information is less than half the beacon interval. © 2010 IEEE.

关键词： Packet loss

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GDCA: A distributed channel assignment mechanism for multi-radio multi-channel wireless mesh networks

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Journal of networks 2011年第2期6卷 303-310页

作者： Xia, Yan Zeng, Yingzhi Gong, Zhenghu Xin, Qin School of Computer National University of Defense Technology Changsha Hunan China School of Information Science and Engineering Hunan University Changsha Hunan China Networks and Distributed Systems Simula Research Laboratory Oslo Norway

Channel assignment is one of the most important problem in the research of the multi-radio multi-channel wireless mesh networks ((MRMC-WMN). Aiming at minimizing the overall network interference and optimizing the usage of channel resource, channel assignment problem must obey the constraint of limited radios and available channels for MRMC-WMN. The above optimization problem is known to be NP-complete. This paper focuses on the study of channel assignment in MRMC-WMN. We propose a new grid-loop-based echanism for dynamic channel assignment. Our mechanism exploits the group which we called grid-loop, which is constructed on distributed minimum spanning tree by self-organized. Our new GDCA scheme has many advantages over cluster-based scheme. The analysis and comparison demonstrates its feasibility, stability, cost-saving and efficiency. © 2011 ACADEMY PUBLISHER.

关键词： MESH networking

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Flexible resource management for Self-X systems: An evaluation

Flexible resource management for Self-X systems: An evaluati...

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2010 13th IEEE International Symposium on Object/Component/Service-Oriented Real-Time distributed Computing Workshops, ISORC Workshops 2010

作者： Oberthür, Simon Zaremba, Leszek Lichte, Hermann Simon Department of Design of Distributed Embedded Systems Heinz Nixdorf Institute University of Paderborn Paderborn Germany Computer Networks Group University of Paderborn Paderborn Germany

ISBN: (纸本)9780769540382

In classical real-time systems the resources for an application are allocated at system start so that every resource request can be fulfilled in future. This would lead to much internal waste of resources in the case of modern Self-X systems, because these systems have highly dynamic resource consumptions. The Flexible Resource Manager (FRM) was developed to overcome this problem. The manager puts temporarily unused resources at other applications' disposal. In this paper the FRM approach is evaluated by concrete application examples and randomly generated applications. © 2010 IEEE.

关键词： Real time systems

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HAS DEDICATED HARDWARE FOR PROLOG A FUTURE

HAS DEDICATED HARDWARE FOR PROLOG A FUTURE

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INTERNATIONAL WORKSHOP ON PROCESSING DECLARATIVE KNOWLEDGE ( PDK 91 )

作者： DOROCHEVSKY, M NOYE, J THIBAULT, O European Computer-Industry Research Centre Parallel and Distributed Systems Group Arabellastr. 17 München 81 D-8000 Germany

ISBN: (纸本)354055033X

Efficiency has always been one of the problems of high-level languages like Prolog. Different solutions have been suggested to speed up the execution of Prolog. One alternative is to build dedicated hardware. Another alternative, using advanced compilation techniques through global analysis, has been taken recently with spectacular results. A third alternative consists of combining hardware and software solutions. This paper discusses the relative merits and shortcomings of the three approaches in the light of the experiince gained at ECRC in the KCM (Knowledge Crunching Machine) project, the ultimate question being: “Has dedicated hardware for Prolog a future?”. © 1991, Springer Verlag. All rights reserved.

关键词： computer circuits

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Deadlock-free dynamic network reconfiguration based on close up*/down*graphs

Deadlock-free dynamic network reconfiguration based on close...

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14th International Euro-Par Conference, Euro-Par 2008

作者： Robles-Gómez, Antonio Bermúdez, Aurelio Casado, Rafael Solheim, Åshild Grønstad Universidad de Castilla-La Mancha Spain Simula Research Laboratory Networks and Distributed Systems Group Norway Department of Informatics University of Oslo Norway

ISBN: (纸本)3540854509

Current high-performance distributed systems use a switch-based interconnection network. After the occurrence of a topological change, a management mechanism must reestablish connectivity between network devices. This mechanism discovers the new topology, calculates a new set of routing paths, and updates the routing tables within the network. The main challenge related to network reconfiguration (the change-over from one routing function to another) is avoiding deadlocks. Former reconfiguration techniques significantly reduce network service. In addition, most recent proposals either need extra network resources (such as virtual channels) or their computation complexities are prohibitive. For up*/down*routed networks we propose a new reconfiguration method that supports a virtually unaffected network service at a minor computational cost. This method is suitable for both source and distributed routing networks, and does neither restrict the injection of packets nor the updating of routing tables during the topology-change assimilation. © 2008 Springer-Verlag Berlin Heidelberg.

关键词： Topology

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