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High Performance Computing and Communications: Third international Conference, HPCC 2007 Proceedings

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3rd international Conference on High Performance Computing and Communications, HPCC 2007

ISBN: (纸本)9783540754435

The proceedings contain 75 papers. The topics discussed include: programming challenges for petascale and multicore parallel systems;bandwidth-aware design of large-scale clusters for scientific computations;the changing impact of semiconductor technology on processor architecture;a windows-based parallel file system;coarse-grain time slicing with resource-share control in parallel-job scheduling;performance evaluation of distributed computing over heterogeneous networks;hybrid line search for multiobjective optimization;continuous adaptive outlier detection on distributed data streams;a data imputation model in sensor databases;an adaptive parallel hierarchical clustering algorithm;resource aggregation and workflow with webcom;performance evaluation of view-oriented parallel programming on cluster of computers;a low-power globally synchronous locally asynchronous FFT processor;and file and memory security analysis for grid systems.

关键词： parallel processing systems

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Automatic MPI application transformation with ASPhALT

Automatic MPI application transformation with ASPhALT

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21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Danalis, Anthony Pollock, Lori Swany, Martin University of Delaware Department of Computer and Information Sciences Newark DE 19716 United States

ISBN: (纸本)1424409101

This paper describes a source to source compilation tool for optimizing MPI-based parallel applications. This tool is able to automatically apply a "prepushing" transformation that causes MPI programs to aggressively send data as soon as it is available, thus improving communication-computation overlap and improving application performance. In this paper we present asphalt_transformer;the Open64-based component of our framework, ASPhALT, responsible for automatically performing the prepushing transformation. We also present an extensive study of the performance gains witnessed from automatically transformed codes. In particular, we demonstrate how different levels of aggregation affect the performance of parallel programs executing various computation kernels on different clusters. Furthermore, we discuss the differences in performance improvement between the hand-optimized and automatically optimized codes, as well as the effect of automation on time-to-solution. © 2007 IEEE.

关键词： parallel processing systems

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CoQUOS: Lightweight support for continuous queries in unstructured overlays

CoQUOS: Lightweight support for continuous queries in unstru...

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21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Ramaswamy, Lakshmish Chen, Jianxia Parate, Piyush Dept. of Computer Science University of Georgia Athens GA 30602 United States

ISBN: (纸本)1424409101

The utility and the effectiveness of peer-to-peer (P2P) content distribution systems can be greatly enhanced by augmenting their ad-hoc content discovery mechanisms with two capabilities, namely a mechanism to enable the peers to register their queries and receive notifications when corresponding data-items are added to the network and a means for the peers to advertise their new content. While P2P-based publish-subscribe systems can infuse these capabilities, developing full-fledged publishsubscribe systems on top of unstructured P2P networks requires complex techniques, and it is often an overkill for many P2P applications. For these applications, we study the alternate continuous query paradigm, which is functionally similar to publish-subscribe systems, but provides best-effort notification guarantees. This paper presents CoQUOS - a scalable and lightweight middleware to support continuous queries in unstructured P2P networks. A key strength of the CoQUOS system is that it can be implemented on any unstructured overlay network. Moreover, CoQUOS preserves the simplicity and flexibility of the overlay network. Central to our design of the CoQUOS middleware is a completely decentralized scheme to register a query at different regions of the P2P network. This mechanism includes two novel components, namely cluster resilient random walk algorithm for propagating query to various regions of the network and dynamic probability-based query registration technique for ensuring that the registrations are well distributed. Our experiments show that the proposed techniques are highly effective and their overheads are low. © 2007 IEEE.

关键词： distributed computer systems

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distributed IDS using reconfigurable hardware

Distributed IDS using reconfigurable hardware

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21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Tummala, Ashok Kumar Patel, Parimal University of Texas at San Antonio Department of Electrical Engineering San Antonio TX 78249

ISBN: (纸本)1424409101

With the rapid growth of computer networks and network infrastructures and increased dependency on the internet to carry out day-to-day activities, it is imperative that the components of the system are secured. In the last few years a number of Intrusion Detection systems (IDS) have been developed as network security tools, both in commercial and academic sectors. These systems have used different approaches to detecting unauthorized activity, and have given us some insight into the problems that still have to be solved. While considerable progress has been made in the areas of string matching, header processing and detecting DoS attacks at network level, complete systems have not yet been demonstrated that provide all of the functionality necessary to perform intrusion detection at each host system there by securing the entire network. In this paper we are proposing the architecture of a distributed Intrusion Detection System (DIDS) for use in high-speed networks. The proposed DIDS has Host IDS component at each host that combines the above-mentioned functionalities along with the capability of collecting the events at the application level to look for any signs of intrusion at the network level. DIDS consists of Central IDS component which performs sophisticated processing to detect any signs of distributed attacks on the entire network and update rules in each host system. For high speed networks it can be difficult to keep up with intrusion detection using purely software approach without affecting performance of the system intended for designed application. It is essential to use hardware systems or software with hardware accelerators. The proposed DIDS is a custom hardware implemented on Field Programmable Gate Arrays (FPGAs). This move to customized hardware-based systems allows the introduction of higher degree of parallelism than might be possible in software at a reasonable cost. The key aspects of this system are flexibility and partial reconfigurability

关键词： Intrusion detection

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The security threats and corresponding measures to distributed storage systems

引用

7th international symposium on Advanced parallel Processing Technologies

作者： Chen, Lanxiang Feng, Dan Ming, Liang Huazhong Univ Sci & Technol Sch Comp Sci & Technol Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China

ISBN: (纸本)9783540768364

There are various threats in distributed storage systems, but there is no comprehensive category. There are some research works on threat modeling and the challenges of protecting storage systems, but there is no corresponding security measure to these threats and challenges. In this paper, elements of storage security and a comprehensive category of threats are presented, which goes from hardware level to software level, from kernel level to application level, from local to network. The corresponding security measures to these threats are provided. And the seven steps process of security is proposed which gives methodology to implement these security measures. Finally, some important storage security issues and future directions to storage security are concluded.

关键词： storage security security threat security measure process of security threat modeling

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distributed virtual reality in education 07

Distributed virtual reality in education

引用

11th IEEE international symposium on distributed Simulation and Real-Time Applications, DS-RT 2007

作者： Kaufmann, Hannes Vienna University of Technology Interactive Media Systems Group Vienna Austria Institute of Software Technology and Interactive Systems Vienna University of Technology VR Group

ISBN: (纸本)0769530117

Educational virtual reality (VR) applications have a huge potential to support learning and teaching. A brief overview of previous educational VR applications will be followed by a summary of requirements specific to this field. In a typical collaborative classroom situation where large groups of users must be supported, as well as in distance education, robust and reliable networked environments are of primary importance. The speaker will present Construct3D, an application for geometry education that has been developed at the VR group at Vienna University of Technology throughout the past 6 years. Specific design aspects to allow distributed collaboration in Construct3D are presented. This concerns improvements of the user interface, usability and system performance including bandwidth efficiency. The results of three evaluations, some of them in co-located and distributed setups, with a total of more than 500 students in over 300 teaching lessons will be presented. © 2007 IEEE.

关键词： Virtual reality

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Detecting runtime environment interference with parallel application behavior

Detecting runtime environment interference with parallel app...

引用

21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Knapp, Rashawn L. Karavanic, Karen L. Pase, Douglas M. Portland State University Department of Computer Science P.O. Box 751 Portland OR 97207-0751 IBM System X HPC Portfolio Development Dept. E1WA/205/EE154 3039 Cornwallis Rd. Res. Triangle Park NC 27709-2195

ISBN: (纸本)1424409101

Many performance problems observed in high end systems are actually caused by the runtime system and not the application code. Detecting these cases will require parallel performance tools to incorporate information about the runtime system;however many current tools do not. We present a test suite for evaluating the ability of performance tools to reach a correct diagnosis in cases where a problem is caused by the runtime environment. We include a set of results for one of the tests, which measures application performance as NFS server load is increased. We also present a model for performance diagnosis that combines system and application level information. © 2007 IEEE.

关键词： Problem solving

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parallel XML processing by work stealing

Parallel XML processing by work stealing

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16th international symposium on High Performance distributed Computing 2007, HPDC'07 and Co-Located Workshops

作者： Lu, Wei Gannon, Dennis Indiana University 150 S. Woodlawn Ave. Bloomington IN 47405

ISBN: (纸本)159593717X

A language for semi-structured documents, XML has emerged as the core of the web services architecture, and is playing crucial roles in messaging systems, databases, and document processing. However, the processing of XML documents has been regarded as the performance bottleneck in most systems and applications. On the other side, the multicore processor, emerged as a solution for the clock-speed limitation of the modern CPUs, has been growingly prevalent. Leveraging the parallelism provided by the multicorere source to speedup the software execution is becoming the trend of the software development. In this paper, we present a parallel processing model for the XML document. The model is not designed just for a specific XML processing task, instead, it is a general model, by which we are able to explore various parallel XML document processing. The kernel of the model is a stealing-based dynamic load-balancing mechanism, called ThreadCrew, by which multiple threads are able to process the disjointed parts of the XML document in parallel with balanced load distribution. The model also provides a novel mechanism to trace the stealing actions, thus the equivalent sequential result can be gotten by gluing the multiple parallel-running results together. To show the feasibility and effectiveness of our approaches, we present our C# implementation of parallel XML serialization in this paper. Our empirical study shows our parallel XML serialization algorithm can improved the XML serializing performance significantly on a multicore machine. Copyright 2007 ACM.

关键词： XML

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Constant time simulation of an R-mesh on an LR-mesh

Constant time simulation of an R-mesh on an LR-mesh

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21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Córdova-Flores, Carlos Alberto Fernández-Zepeda, José Alberto Bourgeois, Anu G. CICESE Department of Computer Science Km. 107 Carretera Tijuana-Ensenada Ensenada B.C. 22860 Mexico Georgia State University Department of Computer Science Atlanta GA 30303 United States

ISBN: (纸本)1424409101

Recently, many parallel computing models using dynamically reconfigurable electrical buses have been proposed in the literature. The underlying characteristics are similar among these models, but they do have certain differences that can take form of restrictions on configurations allowed. This paper presents a constant time simulation of an R-Mesh on an LR-Mesh (a restricted model of the R-Mesh), proving that in spite of the differences, the two models possess the same complexity. In other words, the LR-Mesh can simulate a step of the R-Mesh in constant time with a polynomial increase in size. This simulation is based on Reingold's algorithm to solve USTCON in log-space. The simulation is also the first to be executed in constant time. © 2007 IEEE.

关键词： parallel processing systems

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SWARM: A parallel programming framework for multicore processors

SWARM: A parallel programming framework for multicore proces...

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21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Bader, David A. Kanade, Varun Madduri, Kamesh College of Computing Georgia Institute of Technology Atlanta GA 30332

ISBN: (纸本)1424409101

Due to fundamental physical limitations and power constraints, we are witnessing a radical change in commodity microprocessor architectures to multicore designs. Continued performance on multicore processors now requires the exploitation of concurrency at the algorithmic level. In this paper, we identify key issues in algorithm design for multicore processors and propose a computational, model for these systems. We introduce SWARM (Software and Algorithms for Running on Multi-core), a portable open-source parallel library of basic primitives that fully exploit multicore processors. Using this framework, we have implemented efficient parallel algorithms for important primitive operations such as prefixsums, pointer-jumping, symmetry breaking, and list ranking;for combinatorial problems such as sorting and selection;for parallel graph theoretic algorithms such as spanning tree, minimum spanning tree, graph decomposition, and tree contraction;and for computational genomics applications such as maximum parsimony. The main contributions of this paper are the design of the SWARM multicore framework, the presentation of a multicore algorithmic model, and validation results for this model. SWARM is freely available as open-source from http: //***/. © 2007 IEEE.

关键词： parallel programming

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