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Testing peer-to-peer systems

Testing peer-to-peer systems

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19th international symposium on software Reliability engineering

作者： de Almeida, Eduardo Cunha Sunye, Gerson Le Traon, Yves Valduriez, Patrick Univ Fed Parana BR-80060000 Curitiba Parana Brazil Univ Nantes LINA Nantes France Univ Luxembourg Luxembourg Luxembourg INRIA F-34060 Montpellier France LIRMM Montpellier France

Peer-to-peer (P2P) offers good solutions for many applications such as large data sharing and collaboration in social networks. Thus, it appears as a powerful paradigm to develop scalable distributed applications, as reflected by the increasing number of emerging projects based on this technology. However, building trustworthy P2P applications is difficult because they must be deployed on a large number of autonomous nodes, which may refuse to answer to some requests and even leave the system unexpectedly. This volatility of nodes is a common behavior in P2P systems and may be interpreted as a fault during tests (i.e., failed node). In this work, we present a framework and a methodology for testing P2P applications. The framework is based on the individual control of nodes, allowing test cases to precisely control the volatility of nodes during their execution. We validated this framework through implementation and experimentation on an open-source P2P system. The experimentation tests the behavior of the system on different conditions of volatility and shows how the tests were able to detect complex implementation problems. © Springer Science+Business Media, LLC 2009.

关键词： software testing Peer-to-peer systems distributed hash tables (DHT) Testing methodology Experimental procedure

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Energy minimization on thread-level speculation in multicore systems

Energy minimization on thread-level speculation in multicore...

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9th international symposium on parallel and distributed Computing, ISPDC 2010

作者： Li, Peng Guo, Song Department of Computer Science and Engineering University of Aizu Aizu-Wakamatsu Japan

ISBN: (纸本)9780769541204

Thread-Level Speculation (TLS) has shown great promise as an automatic parallelization technique to achieve high level performance by partitioning a sequential program into threads, which are expected to be optimistically executed in parallel. In this paper, we propose a load-balancing approach to save energy using dynamic voltage scaling. By scaling the voltage of processors running short threads, energy consumption on these processors can be reduced while keeping a similar speedup of the overall system. Two voltage selection strategies have been investigated. With the assistance of some profiling tools, we propose a static voltage selection algorithm that can minimize energy consumption without degrading the parallelism provided by the pure TLS. The other dynamic algorithm selects voltage for each thread with prediction during the execution. Our experimental results show that its energy consumption is reduced to 78.8% and execution time is stretched to 1.07 times, on average, of the pure TLS in a 16-core CMP processor. © 2010 IEEE.

关键词： Energy efficiency

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Performance analysis of distributed software systems: A model-driven approach

Performance analysis of distributed software systems: A mode...

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作者： Traore, Issa Woungang, Isaac Ahmed, Ahmed Awad El Sayed Obaidat, Mohammad S. Department of Electrical and Computer Engineering University of Victoria Victoria BC Canada Department of Computer Science Ryerson University Toronto ON Canada Department of Computer Science Monmouth University West Long Branch NJ 07764 United States

ISBN: (纸本)9781565553415

The design of complex software systems is a challenging task because it involves a wide range of quality attributes such as security, performance, reliability, to name a few. Dealing with each of these attributes requires specific set of skills, which quite often, involves making various trade-offs. This paper proposes a novel Model-Driven software Performance engineering (MDSPE) process that can be used for performance analysis requirements of distributed software systems. An example assessment is given to illustrate how our MDSPE process can comply with wellknown performance models to assess the performance measures.

关键词： Life cycle

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Design and performance evaluation of binary code packing for protecting embedded software against reverse engineering

Design and performance evaluation of binary code packing for...

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13th IEEE international symposium on Object, Component, and Service-Oriented Real-Time distributed Computing, ISORC 2010

作者： Kim, Min-Jae Lee, Jin-Young Chang, Hye-Young Cho, Seong Je Park, Minkyu Park, Yongsu Wilsey, Philip A. Department of Computer Science Dankook University Yongin Korea Republic of Department of Computer Science Konkuk University Chungju Korea Republic of Department of Computer Science and Engineering Hanyang University Seoul Korea Republic of Department of Electrical and Computer Engineering University of Cincinnati Cincinnati United States

ISBN: (纸本)9780769540375

Packing (or executable compression) is considered as one of the most effective anti-reverse engineering methods in the Microsoft Windows environment. Even though many reversing attacks are widely conducted in the Linux-based embedded system there is no widely used secure binary code packing tools for Linux. This paper presents two secure packing methods that use AES encryption and the UPX packer to protect the intellectual property (IP) of software from reverse engineering attacks on Linux-based embedded system. We call these methods: secure UPX and AES-encryption packing. Since the original UPX system is designed not for software protection but for code compression, we present two anti-debugging methods in the unpacking module of the secure UPX to detect or abort reverse engineering attacks. Furthermore, since embedded systems are highly resource constrained, minimizing unpacking overhead is important. Therefore, we analyze the performance of the two packing methods from the perspective of: (i) code size, (ii) execution time, and (iii) power consumption. Our analysis results show that the Secure UPX performs better than AES-encryption packing in terms of the code size, execution time, and power consumption. © 2010 IEEE.

关键词： Embedded systems

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Analysis of integrity vulnerabilities and a non-repudiation protocol for cloud data storage platforms

Analysis of integrity vulnerabilities and a non-repudiation ...

引用

international Workshop on Scheduling and Resource Management for parallel and distributed systems

作者： Feng, Jun Chen, Yu Ku, Wei-Shinn Liu, Pu Dept. of Electrical and Computer Engineering SUNY - Binghamton Binghamton NY 13902 United States Dept. of Computer Science and Software Engineering Auburn University Auburn AL 36849 United States Systems and Technology Group IBM Endicott Endicott NY 13760 United States

ISBN: (纸本)9780769541570

Data storage technologies have been recognized as one of the major dimensions of information management along with the network infrastructure and applications. The prosperity of cloud computing requires the migration from server-attached storage to network-based distributed storage. Along with variant advantages, distributed storage also poses new challenges in creating a secure and reliable data storage and access facility. The data security in cloud is one of the challenges to be addressed before the novel pay-as-you-go business model can be accepted and applied widely. Concerns are raised from both insecure/unreliable service providers and potential malicious users. In this article, we analyze the integrity vulnerability existing in the current cloud storage platforms and show the problem of repudiation. A novel non-repudiation (NR) protocol specifically designed in the context of cloud computing environment is proposed. We have also discussed the robustness of the NR protocol against typical attacks in the network environments. © 2010 IEEE.

关键词： Cloud storage

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Analysis of selected component technologies efficiency for parallel and distributed seismic wave field modeling

Analysis of selected component technologies efficiency for p...

引用

international Joint Conference on Computer, Information, systems Sciences and engineering

作者： Kowal, A. Piorkowski, A. Danek, T. Pieta, A. AGH Univ Sci & Technol Dept Geoinfomat & Appl Comp Sci Krakow Poland

ISBN: (纸本)9789048136575

In this article efficiency of using component-based software for seismic wave field modeling is presented. The most common component solutions like:.NET, Java and Mono were analyzed for various operating systems and hardware platform combinations. Obtained results clearly indicate that the component approach is able to give satisfactory results in this kind of applications, but global solution efficiency can strongly depends on operating system and hardware. The most important conclusion of this work is that for this kind of computations and at this stage of component technology development there are almost no differences between commercial and free platforms.

关键词： wave field modeling component platforms

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Designing high-performance and resilient message passing on InfiniBand

Designing high-performance and resilient message passing on ...

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2010 IEEE international symposium on parallel and distributed Processing, Workshops and Phd Forum, IPDPSW 2010

作者： Koop, Matthew J. Shamis, Pavel Rabinovitz, Ishai Panda, Dhabaleswar K. United States Mellanox Technologies United States Dept. of Computer Science and Engineering Ohio State University United States

ISBN: (纸本)9781424465347

Clusters featuring the InfiniBand interconnect are continuing to scale. As an example, the "Ranger" system at the Texas Advanced Computing Center (TACC) includes over 60,000 cores with nearly 4,000 InfiniBand ports. The latest Top500 list shows 30% of systems and over 50% of the top 100 are now using InfiniBand as the compute node interconnect. As these systems continue to scale, the Mean-Time-Between-Failure (MTBF) is reducing and additional resiliency must be provided to the important components of HPC systems, including the MPI library. In this paper we present a design that leverages the reliability semantics of InfiniBand, but provides a higherlevel of resiliency. We are able to avoid aborting jobs in the case of network failures as well as failures on the endpoints in the InfiniBand Host Channel Adapters (HCA). We propose reliability designs for rendezvous designs using both Remote DMA (RDMA) read and write operations. We implement a prototype of our design and show that performance is near-identical to that of a non-resilient design. This shows that we can have both the performance and the network reliability needed for large-scale systems. © 2010 IEEE.

关键词： Mean time between failures

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High resolution program flow visualization of hardware accelerated hybrid multi-core applications 10

High resolution program flow visualization of hardware accel...

引用

10th IEEE/ACM international symposium on Cluster, Cloud, and Grid Computing, CCGrid 2010

作者： Hackenberg, Daniel Juckeland, Guido Brunst, Holger Technische Universität Dresden 01062 Dresden Germany

ISBN: (纸本)9781424469871

The advent of multi-core processors has made parallel computing techniques mandatory on main stream systems. With the recent rise of hardware accelerators, hybrid parallelism adds yet another dimension of complexity to the process of software development. This article presents a tool for graphical program flow analysis of hardware accelerated parallel programs. It monitors the hybrid program execution to record and visualize many performance relevant events along the way. Representative real-world applications written for both IBM's Cell processor and NVIDIA's CUDA API are studied exemplarily. To the best of our knowledge, this approach is the first that visualizes the parallelism in hybrid multi-core systems at the presented level of detail. © 2010 IEEE.

关键词： parallel processing systems

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Dynamic load balancing on single- and multi-GPU systems

Dynamic load balancing on single- and multi-GPU systems

引用

24th IEEE international parallel and distributed Processing symposium, IPDPS 2010

作者： Chen, Long Villa, Oreste Krishnamoorthy, Sriram Gao, Guang R. Department of Electrical and Computer Engineering University of Delaware Newark DE 19716 United States High Performance Computing Pacific Northwest National Laboratory Richland WA 99352 United States

ISBN: (纸本)9781424464432

The computational power provided by many-core graphics processing units (GPUs) has been exploited in many applications. The programming techniques currently employed on these GPUs are not sufficient to address problems exhibiting irregular, and unbalanced workload. The problem is exacerbated when trying to effectively exploit multiple GPUs concurrently, which are commonly available in many modern systems. In this paper, we propose a task-based dynamic load-balancing solution for single- and multi-GPU systems. The solution allows load balancing at a finer granularity than what is supported in current GPU programming APIs, such as NVIDIA's CUDA. We evaluate our approach using both micro-benchmarks and a molecular dynamics application that exhibits significant load imbalance. Experimental results with a single- GPU configuration show that our fine-grained task solution can utilize the hardware more efficiently than the CUDA scheduler for unbalanced workload. On multi- GPU systems, our solution achieves near-linear speedup, load balance, and significant performance improvement over techniques based on standard CUDA APIs. ©2010 IEEE.

关键词： Graphics processing unit

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Towards optimising distributed data streaming graphs using parallel streams 10

Towards optimising distributed data streaming graphs using p...

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Proceedings of the 19th ACM international symposium on High Performance distributed Computing

作者： Liew, Chee Sun Atkinson, Malcolm P. Van Hemert, Jano I. Han, Liangxiu National E-Science Centre School of Informatics University of Edinburgh United Kingdom E-Science Institute University of Edinburgh United Kingdom

ISBN: (纸本)9781605589428

Modern scientific collaborations have opened up the opportunity of solving complex problems that involve multidisciplinary expertise and large-scale computational experiments. These experiments usually involve large amounts of data that are located in distributed data repositories running various software systems, and managed by different organisations. A common strategy to make the experiments more manageable is executing the processing steps as a work- flow. In this paper, we look into the implementation of fine-grained data-flow between computational elements in a scientific workflow as streams. We model the distributed computation as a directed acyclic graph where the nodes represent the processing elements that incrementally implement specific subtasks. The processing elements are connected in a pipelined streaming manner, which allows task executions to overlap. We further optimise the execution by splitting pipelines across processes and by introducing extra parallel streams. We identify performance metrics and design a measurement tool to evaluate each enactment. We conducted experiments to evaluate our optimisation strategies with a real world problem in the Life Sciences-EURExpress-II. The paper presents our distributed data-handling model, the optimization and instrumentation strategies and the evaluation experiments. We demonstrate linear speed up and argue that this use of data-streaming to enable both overlapped pipeline and parallelised enactment is a generally applicable optimisation strategy Copyright 2010 ACM.

关键词： Pipelines

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