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20th ACM SIGPLAN Symposium on Principles and Practice of Parallel Programming, PPoPP 2015

作者： Xie, Chenning Chen, Rong Guan, Haibing Zang, Binyu Chen, Haibo Shanghai Key Laboratory of Scalable Computing and Systems Institute of Parallel and Distributed Systems Shanghai Jiao Tong University China Shanghai Key Laboratory of Scalable Computing and Systems Department of Computer Science Shanghai Jiao Tong University China

ISBN: (纸本)9781450332057

Large-scale graph-structured computation usually exhibits iterative and convergence-oriented computing nature, where input data is computed iteratively until a convergence condition is reached. Such features have led to the development of two different computation modes for graph-structured programs, namely synchronous (Sync) and asynchronous (Async) modes. Unfortunately, there is currently no in-depth study on their execution properties and thus programmers have to manually choose a mode, either requiring a deep understanding of underlying graph engines, or suffering from suboptimal performance. This paper makes the first comprehensive characterization on the performance of the two modes on a set of typical graph-parallel applications. Our study shows that the performance of the two modes varies significantly with different graph algorithms, partitioning methods, execution stages, input graphs and cluster scales, and no single mode consistently outperforms the other. To this end, this paper proposes Hsync, a hybrid graph computation mode that adaptively switches a graph-parallel program between the two modes for optimal performance. Hsync constantly collects execution statistics on-the-fly and leverages a set of heuristics to predict future performance and determine when a mode switch could be profitable. We have built online sampling and offline profiling approaches combined with a set of heuristics to accurately predicting future performance in the two modes. A prototype called PowerSwitch has been built based on PowerGraph, a state-of-the-art distributed graph-parallel system, to support adaptive execution of graph algorithms. On a 48-node EC2-like cluster, PowerSwitch consistently outperforms the best of both modes, with a speedup ranging from 9% to 73% due to timely switch between two modes. Copyright 2015 ACM.

关键词： Graphic methods

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Preface

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CEUR Workshop Proceedings 2017年 1826卷

作者： Kopp, Oliver Lenhard, Jörg Pautasso, Cesare University of Stuttgart Institute for Parallel and Distributed Systems Universitätsstraße 38 StuttgartDE70569 Germany Karlstad University Department of Mathematics and Computer Science Universitetsgatan 2 KarlstadSE65188 Sweden USI Faculty of Informatics Architecture Design and Web Information Systems Engineering Research Group Via Buffi 13 LuganoCH6900 Switzerland

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FuzzyCAT: a Lightweight Adaptive Transform for Sensor Data Compression

FuzzyCAT: a Lightweight Adaptive Transform for Sensor Data C...

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International Conference on Communication Workshop

作者： Vasilisa Bashlovkina Mohamed Abdelaal Oliver Theel Computer Science Department System Software and Distributed Systems

This paper aims at developing a novel high precision compression method. Based on the previously developed Fuzzy Transform Compression (FTC), we design and implement a modified version of the algorithm, referred to as Fuzzy Compression Adaptive Transform (FuzzyCAT). The underlying idea of FuzzyCAT is to adapt the transform parameters to the signal's curvature inferred from the time derivatives. FuzzyCAT outperforms the original FTC while preserving its favorable qualities like periodicity and resilience to lost packets. It also shows a competitive edge over the Lightweight Temporal Compression (LTC) method. A series of experiments with a network of TelosB sensor nodes revealed that transmission costs of the FuzzyCAT algorithm is much less than that of LTC at the expense of a slight increase in processing power. This makes it an outstanding candidate for data compression in wireless sensor networks.

关键词： Wireless Sensor Networks Energy Efficiency Data Compression Lossy Compression Fuzzy Transform

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distributed privacy-preserving data aggregation via anonymization 3rd

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3rd International Conference on Networked systems, NETYS 2015

作者： Benkaouz, Yahya Erradi, Mohammed Freisleben, Bernd Networking and Distributed Systems Research Group ENSIAS Mohammed V University Rabat Morocco Department of Mathematics and Computer Science Philipps-Universität Marburg Marburg Germany

ISBN: (纸本)9783319268491

Data aggregation is a key element in many applications that draw insights from data analytics, such as medical research, smart metering, recommendation systems and real-time marketing. In general, data is gathered from several sources, processed, and publicly released for data analysis. Since the considered data might contain personal and sensitive information, special handling of private data is required. In this paper, we present a novel distributed privacy-preserving data aggregation protocol, called ADiPA. It relies on anonymization techniques for protecting personal data, such as k-anonymity, l-diversity and t-closeness. Its purpose is to allow a set of entities to derive aggregate results from data tables that are partitioned across these entities in a fully decentralized manner while preserving the privacy of their individual sensitive inputs. ADiPA neither relies on a trusted third party nor on cryptographic techniques. The protocol performs accurate aggregation when communication links and nodes do not fail. © Springer International Publishing Switzerland 2015.

关键词： Privacy-preserving techniques

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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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Assessing the benefits of search-based approaches when designing self-adaptive systems: a controlled experiment

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Journal of Software Engineering Research and Development 2015年第1期3卷 1-27页

作者： Sandro S Andrade Raimundo J de A Macêdo Distributed Systems Laboratory (LaSiD) Federal University of Bahia (UFBa) Institute of Mathematics Department of Computer Science Salvador-BA Brazil GSORT Distributed Systems Group Federal Institute of Education Science and Technology of Bahia (IFBa) Department of Computer Science Salvador-BA Brazil

The well-orchestrated use of distilled experience, domain-specific knowledge, and well-informed trade-off decisions is imperative if we are to design effective architectures for complex software-intensive systems. In particular, designing modern self-adaptive systems requires intricate decision-making over a remarkably complex problem space and a vast array of solution mechanisms. Nowadays, a large number of approaches tackle the issue of endowing software systems with self-adaptive behavior from different perspectives and under diverse assumptions, making it harder for architects to make judicious decisions about design alternatives and quality attributes trade-offs. It has currently been claimed that search-based software design approaches may improve the quality of resulting artifacts and the productivity of design processes, as a consequence of promoting a more comprehensive and systematic representation of design knowledge and preventing design bias and false intuition. To the best of our knowledge, no empirical studies have been performed to provide sound evidence of such claim in the self-adaptive systems domain. This paper reports the results of a quasi-experiment performed with 24 students of a graduate program in distributed and Ubiquitous Computing. The experiment evaluated the design of self-adaptive systems using a search-based approach proposed by us, in contrast to the use of a non-automated approach based on architectural styles catalogs. The goal was to investigate to which extent the adoption of search-based design approaches impacts on the effectiveness and complexity of resulting architectures. In addition, we also analyzed the approach’s potential for leveraging the acquisition of distilled design knowledge. Our findings show that search-based approaches can improve the effectiveness of resulting self-adaptive systems architectures and reduce their design complexity. We found no evidence regarding the approach’s potential for leveraging the acqu

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FAIL*: An Open and Versatile Fault-Injection Framework for the Assessment of Software-Implemented Hardware Fault Tolerance

FAIL*: An Open and Versatile Fault-Injection Framework for t...

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European Dependable Computing Conference (EDCC)

作者： Horst Schirmeier Martin Hoffmann Christian Dietrich Michael Lenz Daniel Lohmann Olaf Spinczyk Departmcnt of Computer Science 12 Technische Universität Dortmund Germany Chair of Distributed Systems and Operating Systems Friedrich-Alexander-Universitat Erlangen-Ntirnberg Germany

ISBN: (纸本)9781467392907

Due to voltage and structure shrinking, the influence of radiation on a circuit's operation increases, resulting in future hardware designs exhibiting much higher rates of soft errors. Software developers have to cope with these effects to ensure functional safety. However, software-based hardware fault tolerance is a holistic property that is tricky to achieve in practice, potentially impaired by every single design decision. We present FAIL*, an open and versatile architecture-level fault-injection (FI) framework for the continuous assessment and quantification of fault tolerance in an iterative software development process. FAIL* supplies the developer with reusable and composable FI campaigns, advanced pre-and post-processing analyses to easily identify sensitive spots in the software, well-abstracted back-end implementations for several hardware and simulator platforms, and scalability of FI campaigns by providing massive parallelization. We describe FAIL*, its application to the development process of safety-critical software, and the lessons learned from a real-world example.

关键词： Hardware Software Circuit faults Fault tolerance Fault tolerant systems computer architecture Software measurement

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Supporting performance awareness in autonomous ensembles

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2015年 8998卷 291-322页

作者： Bulej, Lubomír Bureš, Tomáš Gerostathopoulos, Ilias Horký, Vojtéch Keznikl, Jaroslav Marek, Lukáš Tschaikowski, Max Tribastone, Mirco Tůma, Petr Department of Distributed and Dependable Systems Charles University Czech Republic Electronics and Computer Science University of Southampton United Kingdom

The ASCENS project works with systems of self-aware, selfadaptive and self-expressive ensembles. Performance awareness represents a concern that cuts across multiple aspects of such systems, from the techniques to acquire performance information by monitoring, to the methods of incorporating such information into the design making and decision making processes. This chapter provides an overview of five project contributions - performance monitoring based on the DiSL instrumentation framework, measurement evaluation using the SPL formalism, performance modeling with fluid semantics, adaptation with DEECo and design with IRM-SA - all in the context of the cloud case study. © Springer International Publishing Switzerland 2015.

关键词： Decision making

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A non-blocking coordinated checkpointing algorithm for message-passing systems 15

A non-blocking coordinated checkpointing algorithm for messa...

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International Conference on Intelligent Information Processing, Security and Advanced Communication, IPAC 2015

作者： Mansouri, Houssem Aliouat, Makhlouf Badache, Nadjib Khan, Al-Sakib Pathan Department of Computer Science Faculty of Exact Sciences University of Bejaia Bejaia06000 Algeria Laboratory of Networks and Distributed Systems Computer Science Department University of Ferhat Abbas Sétif1 Setif19000 Algeria Research Center on Scientific and Technical Information CERIST Ben-Aknoun Algiers16000 Algeria Department of Computer Science International Islamic University Malaysia Kuala Lumpur53100 Malaysia

ISBN: (纸本)9781450334587

This paper proposes an efficient non-blocking coordinated checkpointing algorithm for distributed message passing system which uses transitive dependency information. The processes synchronize their checkpointing activities so that a globally consistent set of checkpoints is always maintained in the system. These algorithms do not require channels to be FIFO (First-In, First-Out) and ensure that each checkpoint taken is part of a consistent global checkpoint. Our scheme also records a minimum number of checkpoints by making sure that only few processes are required to take checkpoints in any execution - it uses very less control-message cost when compared to other related works. © 2015 ACM.

关键词： Fault tolerance

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A novel collaborative approach for sinkhole detection in MANETs 13

A novel collaborative approach for sinkhole detection in MAN...

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13th International Conference on Ad-hoc Networks and Wireless, ADHOC-NOW 2014 accompanied by 2nd International Workshop on Emerging Technologies for Smart Devices, ETSD 2014, 2nd International Workshop on Marine Sensors and systems, MARSS 2014, Multimedia Wireless ad hoc Networks, MWaoN 2014, Security in Ad Hoc Networks, SecAN 2014, 2nd Smart Sensor Protocols and Algorithms, SSPA 2014 and 8th International Workshop on Wireless Sensor, Actuator and Robot Networks, WiSARN 2014

作者： Sánchez-Casado, Leovigildo Maciá-Fernández, Gabriel García-Teodoro, Pedro Aschenbruck, Nils Department of Signal Theory Telematics and Communications School of Computer Science and Telecommunications CITIC-UGR University of Granada C/Periodista Daniel Saucedo Aranda S/n Granada18071 Spain Distributed Systems Group Institute of Computer Science University of Osnabrück Albrechtstr. 28 Osnabrück49076 Germany

ISBN: (纸本)9783662463376

This paper presents a novel approach intended to detect sinkholes in MANETs running AODV. The study focuses on the detection of thewell-known sinkhole attack, devoted to attractmost of the surrounding network traffic by providing fake routes, and thus, invalidating alternative legitimate routes and disrupting the normal network *** detection approach relies on the existence of "contamination borders", formed by legitimate nodes under the influence of the sinkhole attack and, at the same time, neighbors of non-contaminated legitimate nodes. Thus, by collecting the routing information of the neighbors, these nodes are likely to be able to properly detect *** evaluate our approach in a simulation framework and the experimental results show the promising nature of this approach in terms of detection capabilities. © Springer-Verlag Berlin Heidelberg 2015.

关键词： Intrusion detection

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