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检索条件"机构=Computer Engineering and Networks Laboratory TIK"

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Increased reproducibility and comparability of data leak evaluations using ExOT

Increased reproducibility and comparability of data leak eva...

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Design, Automation and Test in Europe Conference and Exhibition

作者： Philipp Miedl Bruno Klopott Lothar Thiele Computer Engineering and Networks Laboratory (TIK) ETH Zurich Zurich Switzerland

ISBN: (数字)9783981926347

ISBN: (纸本)9781728144689

As computing systems are increasingly shared among different users or application domains, researchers have intensified their efforts to detect possible data leaks. In particular, many investigations highlight the vulnerability of systems w.r.t. covert and side channel attacks. However, the effort required to reproduce and compare different results has proven to be high. Therefore, we present a novel methodology for covert channel evaluation. In addition, we introduce the Experiment Orchestration Toolkit ExOT, which provides software tools to efficiently execute the *** methodology ensures that the covert channel analysis yields expressive results that can be reproduced and allow the comparison of the threat potential of different data leaks. ExOT is a software bundle that consists of easy to extend C++ libraries and Python packages. These libraries and packages provide tools for the generation and execution of experiments, as well as the analysis of the experimental data. Therefore, ExOT decreases the engineering effort needed to execute our novel methodology. We verify these claims with an extensive evaluation of four different covert channels on an Intel Haswell and an ARMv8 based platform. In our evaluation, we derive capacity bounds and show achievable throughputs to compare the threat potential of these different covert channels.

关键词： Throughput Error analysis Timing Channel estimation Channel capacity Software

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RocketLogger: Mobile Power Logger for Prototyping IoT Devices: Demo Abstract 16

RocketLogger: Mobile Power Logger for Prototyping IoT Device...

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Proceedings of the 14th ACM Conference on Embedded Network Sensor Systems CD-ROM

作者： Lukas Sigrist Andres Gomez Roman Lim Stefan Lippuner Matthias Leubin Lothar Thiele Computer Engineering and Networks Laboratory (TIK) ETH Zurich Switzerland

ISBN: (纸本)9781450342636

We demonstrate the RocketLogger, a mobile data logger designed for prototyping energy harvesting IoT devices. Novel IoT applications require new dataloggers with a highly increased dynamic range for current measurement to accommodate both ultra-low sleep currents of few nanoamperes as well as wireless communication currents in the range of hundreds of milliamperes. In parallel to ultra-low currents and high dynamic range measurements, novel applications require mobile measurements for easy in-situ characterization or wearable device testing. The RocketLogger is a solution that fulfills these requirements. While being fully mobile, it measures currents from 5 nA up to 500 mA with very fast and seamless range-switching. Using a sample energy harvesting application, we demonstrate its low-current measurement capabilities, fast, seamless auto-ranging and easy-to-use remote user interface.

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networks Cannot Compute Their Diameter in Sublinear Time 12

Networks Cannot Compute Their Diameter in Sublinear Time

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Annual ACM-Society for Industrial and Applied Mathmatics Symposium on Discrete Algorithms

作者： Silvio Frischknecht Stephan Holzer Roger Wattenhofer Computer Engineering and Networks Laboratory (TIK)

ISBN: (纸本)9781611972108

We study the problem of computing the diameter of a network in a distributed way. The model of distributed computation we consider is: in each synchronous round, each node can transmit a different (but short) message to each of its neighbors. We provide an Ω(n) lower bound for the number of communication rounds needed, where n denotes the number of nodes in the network. This lower bound is valid even if the diameter of the network is a small constant. We also show that a (3/2 -ε)-approximation of the diameter requires Ω({the square root of}n ＋ D) rounds. Furthermore we use our new technique to prove an Ω({the square root of}n ＋ D) lower bound on approximating the girth of a graph by a factor 2-ε.

关键词： Diameter short message Network Lower bound sublinear Square root Rounding off network node round number new technique

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End-to-End Delay Minimization in Thermally Constrained Distributed Systems

End-to-End Delay Minimization in Thermally Constrained Distr...

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Euromicro Conference on Real-Time Systems

作者： Pratyush Kumar Lothar Thiele Computer Engineering and Networks Laboratory (TIK) ETH Zürich Switzerland

With ever-increasing power densities, managing on-chip temperatures by optimizing mapping and scheduling of tasks is becoming increasingly necessary. We study the minimization of end-to-end delay for thermally constrained scheduling of an application that is specified as a task graph and is executing on parallel processors without speed scaling. We show that task graph scheduling on thermally constrained systems is monotonic, i.e., delaying the execution of a task longer than necessary cannot lead to the early completion of any other task. Using this monotonicity principle, we design the provably optimal schedule for a given mapping, called the JUST schedule. The JUST schedule can be easily implemented using temperature sensors. We then present different thermal-aware modifications to standard mapping heuristics and evaluate them on a large set of problem instances. The experimental results illustrate that with simple thermal-aware modifications, mappings with much smaller end-to-end delay can be identified.

关键词： Program processors Schedules Delay Processor scheduling Optimal scheduling Power demand Mathematical model

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Dynamic power management in environmentally powered systems 10

Dynamic power management in environmentally powered systems

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Asia and South Pacific Design Automation Conference

作者： Clemens Moser Jian-Jia Chen Lothar Thiele Computer Engineering and Networks Laboratory (TIK) Swiss Federal Institute of Technology Zurich Switzerland

ISBN: (纸本)9781605588377

In this paper a framework for energy management in energy harvesting embedded systems is presented. As a possible example scenario, we focus on wireless sensor nodes which are powered by solar cells. We demonstrate that classical power management solutions have to be reconceived and/or new problems arise if perpetual operation of the system is required. In particular, we provide a set of algorithms and methods for different application scenarios, including real-time scheduling, application rate control as well as reward maximization. The goal is to optimize the performance of the application subject to given energy constraints. Our methods optimize the system performance which allows the usage of, e.g., smaller solar cells and smaller batteries. Our theoretical results are supported by simulations using long-term measurements of solar energy in an outdoor environment. Furthermore, to demonstrate the practical relevance of our approaches, we measured the implementation overhead of our algorithms on real sensor nodes.

关键词： Energy management Environmental management Power system management Photovoltaic cells Battery charge measurement Embedded system Wireless sensor networks Scheduling algorithm Constraint optimization Optimization methods

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Timing Analysis for TDMA Arbitration in Resource Sharing Systems

Timing Analysis for TDMA Arbitration in Resource Sharing Sys...

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IEEE Symposium on Real-Time and Embedded Technology and Applications

作者： Andreas Schranzhofer Jian-Jia Chen Lothar Thiele Computer Engineering and Networks Laboratory (TIK) Swiss Federal Institute of Technology Zurich Switzerland

Modern computing systems have adopted multicore architectures and multiprocessor systems on chip (MPSoCs) for accommodating the increasing demand on computation power. However, performance boosting is constrained by shared resources, such as buses, main memory, DMA, *** paper analyzes the worst-case completion (response) time for real-time tasks when time division multiple access (TDMA) policies are applied for resource ***-time tasks execute periodically on a processing element and are constituted by sequential superblocks. A superblock is characterized by its accesses to a shared resource and its computation time. We explore three models of accessing shared resources: (1)dedicated access model, in which accesses happen only at the beginning and the end of a superblock, (2) general access model, in which accesses could happen anytime during the execution of a superblock, and (3) hybrid access model, which combines the dedicated and general access models. We present a framework to analyze the worst-case completion time of real-time tasks (superblocks) under these three access models, for a given TDMA arbiter. We compare the timing analysis of the three proposed models for a real-world application.

关键词： Timing Time division multiple access Resource management Multicore processing computer architecture Multiprocessing systems System-on-a-chip Boosting Performance analysis Time factors

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Energy-Efficient Real-Time Task Scheduling with Temperature-Dependent Leakage 10

Energy-Efficient Real-Time Task Scheduling with Temperature-...

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Design, Automation & Test in Europe Conference & Exhibition

作者： Chuan-Yue Yang Jian-Jia Chen Lothar Thiele Tei-Wei Kuo National Taiwan University Computer Engineering and Networks Laboratory (TIK) ETH Zürich

ISBN: (纸本)9783981080162

Leakage power consumption contributes significantly to the overall power dissipation for systems that are manufactured in advanced deep sub-micron technology. Different from many previous results, this paper explores leakage-aware energy-efficient scheduling if leakage power consumption depends on temperature. We propose a pattern-based approach which divides a given time horizon into several time segments with the same length, where the processor is in the active (dormant, respectively) mode for a fixed amount of time at the beginning (end, respectively) of each time segment. Computation is advanced in the active mode, whereas the dormant mode helps reduce the temperature via cooling as well as the leakage power consumption. Since the pattern-based approach leads to a steady state with an equilibrium temperature, we develop a procedure to find the optimal pattern whose energy consumption in steady state is the minimum. Compared to existing work, our approach is more effective, has less run-time scheduling overhead, and requires only a simple scheduler to control the system mode periodically. The paper contains extensive simulation results which validate the new models and methods.

关键词： Energy-efficient task scheduling Temperature-dependent leakage power consumption Real-time systems

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Local Algorithms: Self-Stabilization on Speed

Local Algorithms: Self-Stabilization on Speed

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Algorithmic Methods for Distributed Cooperative Systems 2009

作者： Lenzen, Christoph Suomela, Jukka Wattenhofer, Roger Computer Engineering and Networks Laboratory TIK ETH Zurich Zurich8092 Switzerland Helsinki Institute for Information Technology HIIT University of Helsinki P. O. Box 68 FI-00014 Finland

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Analysis, Comparison, and Optimization of Routing Protocols for Energy Harvesting Wireless Sensor networks

Analysis, Comparison, and Optimization of Routing Protocols ...

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IEEE International Conference on Sensor networks, Ubiquitous, and Trustworthy Computing

作者： David Hasenfratz Andreas Meier Clemens Moser Jian-Jia Chen Lothar Thiele Computer Engineering and Networks Laboratory (TIK) Swiss Federal Institute of Technology ETH Zurich Switzerland

Energy harvesting has been steadily gaining interest in the wireless sensor network community. Instead of minimizing the energy consumption and maximizing a network's operational time, the main challenge in energy harvesting sensor networks is to maximize the utility of the application subject to the harvested energy. One major challenge is to maximize the data delivery rates by exploiting the spatial variations of environmental energy. While there exists a multiplicity of energy-aware routing protocols for sensor networks without energy harvesting capabilities, only a small number of routing protocols have been published which explicitly account for energy harvesting. In this paper, we analyze and compare three state-of-the-art routing algorithms. While the original algorithms assume an idealized medium access control (MAC), a lossless wireless channel and global knowledge, we show that these assumptions lead to delusive results. We detail these findings by showing the influence of a low-power MAC protocol, a realistic wireless channel and the protocol overhead. Moreover, we show how to optimize the parameters of the MAC protocol for a given network configuration. By conducting various evaluations, we identify that our modified version of the R-MPRT algorithm outperforms the evaluated algorithms in scenarios where little energy is harvested from the environment.

关键词： Routing protocols Wireless sensor networks Monitoring Batteries Media Access Protocol Base stations Energy management computer networks Pervasive computing Energy consumption

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Combining optimistic and pessimistic DVS scheduling: An adaptive scheme and analysis 10

Combining optimistic and pessimistic DVS scheduling: An adap...

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IEEE International Conference on computer-Aided Design

作者： Simon Perathoner Kai Lampka Nikolay Stoimenov Lothar Thiele Jian-Jia Chen Computer Engineering and Networks Laboratory (TIK) Swiss Federal Institute of Technology Zurich Switzerland Institute of Process Control and Robotics (IPR) Karlsruhe Institute of Technology Karlsruhe Germany

ISBN: (纸本)9781424481927

Performance boosting of modern computing systems is constrained by the chip/circuit power dissipation. Dynamic voltage scaling (DVS) has been applied for reducing the energy consumption by dynamically changing the supply voltage. One can optimistically apply greedy online DVS scheduling algorithms by considering only the events that have arrived in the system. However, this might require a speed that is beyond a system's capability. Alternatively, one can pessimistically use a conservative speed to ensure timing guarantees, which might consume an excessive amount of energy as events might be processed faster than necessary. This paper presents an adaptive scheme that combines these two strategies for the scheduling of arbitrary event streams. The proposed adaptive DVS scheduler chooses the execution speed dynamically as long as it is below a certain threshold. Once the speed exceeds this threshold, the proposed scheduler operates at a constant (pessimistic) speed for guaranteeing the feasibility. The computation of the threshold speed is, however, not straight-forward. For deriving it, we make use of a framework based on timed model checking because the scheduler is strongly state-dependent. The resulting analysis framework allows to obtain the threshold speed for the proposed adaptive DVS scheduling algorithm such that both timing and speed constraints are guaranteed to be met and at the same time an energy-efficient execution is ensured.

关键词： Voltage control Optimized production technology Energy consumption Timing Adaptation model Scheduling algorithm Adaptive scheduling

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