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Tiresias: Black-Box Failure Prediction in distributed systems

Tiresias: Black-Box Failure Prediction in Distributed System...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Andrew W. Williams Soila M. Pertet Priya Narasimhan Electrical & Computer Engineering Department Carnegie Mellon University Pittsburgh PA USA

Faults in distributed systems can result in errors that manifest in several ways, potentially even in parts of the system that are not collocated with the root cause. These manifestations often appear as deviations (or "errors") in performance metrics. By transparently gathering, and then identifying escalating anomalous behavior in, various node-level and system-level performance metrics, the Tiresias system makes black-box failure-prediction possible. Through the trend analysis of performance metrics, Tiresias provides a window of opportunity (look-ahead time) for system recovery prior to impending crash failures. We empirically validate the heuristic rules of the Tiresias system by analyzing fault-free and faulty performance data from a replicated middleware-based system.

关键词： Measurement Network servers Middleware Performance analysis Telecommunication traffic Testing Computer errors Failure analysis Computer crashes Degradation

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FEMS: An Adaptive Finite Element Solver

FEMS: An Adaptive Finite Element Solver

引用

international symposium on parallel and distributed Processing (IPDPS)

作者： Alberto Bertoldo Department of Information Engineering University of Padova Padova Italy

In this paper we investigate how to obtain high-level adaptivity on complex scientific applications such as finite element (FE) simulators by building an adaptive version of their computational kernel, which consists of a sparse linear system solver. We present the software architecture of FEMS, a parallel multifrontal solver for FE applications whose main feature is an install-time training phase where adaptation to the computing platform takes place. FEMS relies on a simple model-driven mesh partitioning strategy, which makes it possible to perform efficient static load balancing on both homogeneous and heterogeneous machines.

关键词： Finite element methods Assembly Matrix decomposition Application software Linear systems Concurrent computing distributed computing Computational modeling Computer architecture Iterative methods

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Spam-Resilient Web Rankings via Influence Throttling

Spam-Resilient Web Rankings via Influence Throttling

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international symposium on parallel and distributed Processing (IPDPS)

作者： James Caverlee Steve Webb Ling Liu College of Computing Georgia Institute of Technology Atlanta GA USA

Web search is one of the most critical applications for managing the massive amount of distributed Web content. Due to the overwhelming reliance on Web search, there is a rise in efforts to manipulate (or spam) Web search engines. In this paper, we develop a spam-resilient ranking model that promotes a source-based view of the Web. One of the most salient features of our spam-resilient ranking algorithm is the concept of influence throttling. We show how to utilize influence throttling to counter Web spam that aims at manipulating link-based ranking systems, especially PageRank-like systems. Through formal analysis and experimental evaluation, we show the effectiveness and robustness of our spam-resilient ranking model in comparison with existing Web algorithms such as PageRank.

关键词： Web search Web pages Search engines distributed computing Content management Counting circuits Algorithm design and analysis Educational institutions Technology management Robustness

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PFAS: A Resource-Performance-Fluctuation-Aware Workflow Scheduling Algorithm for Grid Computing

PFAS: A Resource-Performance-Fluctuation-Aware Workflow Sche...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Fangpeng Dong Selim G. Akl School of Computing Queen's University Kingston ONT Canada

Resource performance in the computational grid is not only heterogeneous, but also changing dynamically. However scheduling algorithms designed for traditional parallel and distributed systems, such as clusters, only consider the heterogeneity of the resources. In this paper, a workflow scheduling algorithm, called PFAS, is proposed and tested in the grid environment. PFAS considers dynamic resource performance fluctuation in the grid, and conducts the scheduling according to its knowledge of the fluctuation. This new algorithm works in an offline way which allows it to be easily set up and run with less cost. Simulations show that our approach can achieve better schedules than the HEFT algorithm.

关键词： Scheduling algorithm Grid computing Processor scheduling Clustering algorithms Dynamic scheduling Fluctuations distributed computing Heuristic algorithms Algorithm design and analysis Costs

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Model-Driven Performance Analysis Methodology for distributed Software systems

Model-Driven Performance Analysis Methodology for Distribute...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Swapna S. Gokhale Paul Vandal Aniruddha Gokhale Dimple Kaul Arundhati Kogekar Jeff Gray Yuehua Lin Department of CSE University of Connecticut Storrs CT USA Department of EECS Vanderbilt University Nashville TN USA Department of CIS University of Alabama Birmingham Birmingham AL USA

A key enabler of the recently popularized, assembly-centric development approach for distributed real-time software systems is QoS-enabled middleware, which provides reusable building blocks in the form of design patterns that codify solutions to commonly recurring problems. These patterns can be customized by choosing an appropriate set of configuration parameters. The configuration options of the patterns exert a strong influence on system performance, which is of paramount importance in many distributed software systems. Despite this considerable influence, currently there is a lack of significant research to analyze performance of middleware at design time, where performance issues can be resolved at a much earlier stage of the application life cycle and with substantially less costs. The present project seeks to develop a performance analysis methodology for design-time performance analysis for distributed software systems implemented using middleware patterns and their compositions. The methodology is illustrated on a producer/consumer system implemented using the active object (AO) pattern in middleware. Finally, broader impacts of the methodology for middleware specialization are also described.

关键词： Performance analysis Software systems Middleware Assembly systems System performance Model driven engineering Design methodology Pattern analysis Computational Intelligence Society Real time systems

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Banquet and Invited Speech Why Peta-Scale is Different: An Ecosystem Approach to Predictive Scientific and Engineering Simulation

Banquet and Invited Speech Why Peta-Scale is Different: An E...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Mark Seager Lawrence Livermore National Labs

With the recent advent of 100s of teraFLOP/s-scale simulations capability at Lawrence Livermore National Laboratory and other sites, it has become clear that the scientific method has changed. This transition has taken us from theory and experiment to theory and experiment being tightly integrated by simulation. With the advent of peta-scale simulations on the horizon it is appropriate to take stock of the recent advances and to look forward to the coming wave of future systems. In this talk we focus on some areas of science that open up with peta-scale systems and how this is VERY different from the science one can accomplish with a single workstation (giga-scale simulation). In actual fact, the science enabled by tera-scale and peta-scale systems require a whole new approach to the scientific method. One of the things we are starting to realize being at the leading edge of applying this new technology, is that with the coming onset of peta-scale simulations (systems, visualization, and applications) is that we may be headed for huge scientific breakthroughs enabled

关键词： Speech Ecosystems Predictive models Computer architecture Computational modeling Laboratories Acceleration parallel processing Wireless sensor networks Concurrent computing

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Checkpoint and Recovery for parallel Applications with Dynamic Number of Processes

Checkpoint and Recovery for Parallel Applications with Dynam...

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international symposium on parallel and distributed Computing

作者： Nam Thoai Doan Viet Hung Faculty of Computer Science and Engineering Ho Chi Minh City University of Technology Vietnam

ISBN: (纸本)9780769529172;0769529178

This paper presents a checkpoint and recovery (C&R) protocol to support fault-tolerance for PVM (parallel Virtual Machine). The protocol helps to mask fail-stop failures from an application. The C&R activities are transparent and do not require any change in the PVM library nor operating system. In PVM, an application can change the number of processes during execution. This paper focuses on solving problems raised by the dynamic spawn and the asynchronous exit of tasks in PVM. The proposed protocol is a non-blocking one, so it reduces side-effect of checkpoint activities of original programs.

关键词： Checkpointing Protocols Application software distributed computing Fault tolerance Libraries Operating systems Computer applications Computer science Virtual machining

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Implementing and Evaluating Automatic Checkpointing

Implementing and Evaluating Automatic Checkpointing

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international symposium on parallel and distributed Processing (IPDPS)

作者： Antonio S. Martins Ronaldo A.L. Goncalves Data Processing Center State University of Maringá Brazil State University of Maringá Brazil

As the size and popularity of computer clusters go on growing, fault tolerance is becoming a crucial factor to ensure high performance and reliability for applications. To provide this facility, a checkpoint mechanism is used to recover a failed parallel application rolling it back to an execution moment prior to occurrence of the failure. In this work we present a mechanism for managing checkpoint operations during the failures automatically. This mechanism records periodically the application's context, identifies failed nodes and restarts MPI processes on the remaining nodes, allowing the continuity of the application and taking advantage of the computing accomplished previously. We describe a lot of changes inside source of the LAM/MPI. Experiments with an application for recognizing DNA similarity showed that despite the overhead caused by periodic checkpoints, the benefits can reach about 50% on a small cluster.

关键词： Checkpointing Operating systems Fault tolerance Application software DNA parallel processing Image analysis Image sequence analysis Pattern analysis File systems

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Dependability Modeling and Analysis in Dynamic systems

Dependability Modeling and Analysis in Dynamic Systems

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international symposium on parallel and distributed Processing (IPDPS)

作者： Salvatore Distefano Antonio Puliafito Engineering Faculty University of Messina Messina Italy

Dependability evaluation is an important, often indispensable, step in (critical) systems design and analysis processes. The introduction of control and/or computing systems to automate processes increases the overall system complexity and therefore has an impact in terms of dependability. Moreover it is of interest to evaluate redundancy and maintenance policies. In those cases it is not possible to recur to notations as reliability block diagrams (RBD), fault trees (FT) or reliability graphs (RG) to represent the system, since the statistical independence assumption is not satisfied. Also more enhanced formalisms as dynamic FT (DFT) could result not adequate to the goal. To overcome those problems we developed a new formalism derived from RBD: the dynamic RBD (DRBD). In this paper we explain how to use the DRBD notation in system modeling and analysis, coming inside a methodology that, starting from the system structure, drives to the overall system availability evaluation following modeling and analysis phases. To do this we use an example drawn from literature consisting of a multiprocessor distributed computing system, also comparing our approach with the DFT one.

关键词： System analysis and design Automatic control Control systems Redundancy Maintenance Fault trees Roentgenium Modeling Availability distributed computing

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File Creation Strategies in a distributed Metadata File System

File Creation Strategies in a Distributed Metadata File Syst...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Ananth Devulapalli Pete Wyckoff Ohio Supercomputer Center Springfield OH USA Ohio Supercomputer Center Columbus OH USA

As computing breaches petascale limits both in processor performance and storage capacity, the only way that current and future gains in performance can be achieved is by increasing the parallelism of the system. Gains in storage performance remain low due to the use of traditional distributed file systems such as NFS, where although multiple clients can access files at the same time, only one node can serve files to the clients. New file systems that distribute load across multiple data servers are being developed; however, most implementations concentrate all the metadata load at a single server still. Distributing metadata load is important to accommodate growing numbers of more powerful clients. Scaling metadata performance is more complex than scaling raw I/O performance, and with distributed metadata the complexity increases further. In this paper we present strategies for file creation in distributed metadata file systems. Using the PVFS distributed file system as our testbed, we present designs that are able to reduce the message complexity of the create operation and increase performance. Compared to the basecase create protocol implemented in PVFS, our design delivers near constant operation latency as the system scales, does not degenerate under high contention situations, and increases throughput linearly as the number of metadata servers increase. The design schemes are applicable to any distributed file system implementation.

关键词： File systems Performance gain File servers Concurrent computing Petascale computing parallel processing System testing Protocols Delay Throughput

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