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检索条件"任意字段=PDSE 2000: International Symposium on Software Engineering for Parallel and Distributed Systems"

共 944 条记录，以下是371-380 订阅

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A Comprehensive Analysis of OpenMP Applications on Dual-Core Intel Xeon SMPs

A Comprehensive Analysis of OpenMP Applications on Dual-Core...

引用

international symposium on parallel and distributed Processing (IPDPS)

作者： Ryan E. Grant Ahmad Afsahi Department of Electrical and Computer Engineering Queen's University Kingston ONT Canada Department of Electrical and Computer Engineering Queen''s University Kingston ONT Canada

Hybrid chip multithreaded SMPs present new challenges as well as new opportunities to maximize performance. Our intention is to discover the optimal operating configuration of such systems for scientific applications and to identify the shared resources that might become a bottleneck to performance under the different hardware configurations. This knowledge will be useful to the research community in developing software techniques to improve the performance of shared memory programs on modern multi-core multiprocessors. In this paper, we study a two-way dual-core Hyper-Threaded (HT) Intel Xeon SMP server under single program and multi-program multithreaded workloads using the NAS OpenMP benchmark suite. Our performance results indicate that in the single-program case, the CMP-based SMP and CMT-based SMP configurations have the highest average speedup across all of the applications. The most efficient architecture is a single HT-enabled dual-core processor that is almost comparable to the performance of a 2-way dual-core HT-disabled system.

关键词： Hardware Yarn Surface-mount technology Performance analysis Application software Multithreading Computer architecture software performance Operating systems Buffer storage

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Locality-aware Buffer Management: Algorithms Design and systems Implementation for Data Intensive Applications (A Brief Progress Report)

Locality-aware Buffer Management: Algorithms Design and Syst...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Xiaodong Zhang Department of Computer Science and Engineering Ohio State Uinversity Columbus OH USA

The speed gap between data processing in CPU and data accessing in disks has reached to an intolerable level, and only become worse as time goes by. This bottleneck has seriously hindered the development of large scale computing systems for data-intensive applications that demand fast accesses to a huge amount of data. Viable and cost-effective solutions to address this problem are to build large memory buffers to cache data for reuse by taking advantage of low price and large capacity of DRAM memory, and to prefetch data for predicted future use by taking advantage of high and idle bandwidths of networks. We are working on four different research projects on locality-aware buffer management for data intensive applications. This report briefly presents the background, motivation, and working progress of our work funded by the NSF NGS program.

关键词： Algorithm design and analysis Delay Data processing Large-scale systems Bandwidth engineering management Application software Computer science Data engineering Design engineering

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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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Mobile systems from a Validation Perspective: a Case Study

Mobile Systems from a Validation Perspective: a Case Study

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international symposium on parallel and distributed Computing

作者： Helene Waeselynck Zoltan Micskei Minh Duc Nguyen Nicolas Riviere LAAS-CNRS Toulouse France Budapest University of Technology and Economics Budapest Hungary

ISBN: (纸本)9780769529172;0769529178

Advances in wireless networking have yielded the development of mobile applications. However, sound technology to specify, design and validate such applications is still to be investigated. In order to exemplify some of the challenges that are raised, this paper reports on a case study: a group membership protocol for ad hoc networks. The protocol has been analyzed by reviewing the specification and the code, and then by testing the implementation. The outcomes provides us with hints for research direction.

关键词： Protocols Mobile computing Testing Ad hoc networks Middleware Computer networks Personal digital assistants Merging Open source software Reverse engineering

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Integrated Risk Analysis for a Commercial Computing Service

Integrated Risk Analysis for a Commercial Computing Service

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international symposium on parallel and distributed Processing (IPDPS)

作者： Chee Shin Yeo Rajkumar Buyya Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne VIC Australia

Utility computing has been anticipated to be the next generation of computing usage. Users have the freedom to easily switch to any commercial computing service to complete jobs whenever the need arises and simply pay only on usage, without any investment costs. A commercial computing service however has certain objectives or goals that it aims to achieve. In this paper, we identify three essential objectives for a commercial computing service: (i) meet SLA, (ii) maintain reliability, and (iii) earn profit. This leads to the problem of whether a resource management policy implemented in the commercial computing service is able to meet the required objectives or not. So, we also develop two evaluation methods that are simple and intuitive: (i) separate and (ii) integrated risk analysis to analyze the effectiveness of resource management policies in achieving the required objectives. Evaluation results based on five policies successfully demonstrate the applicability of separate and integrated risk analysis to assess policies in terms of the required objectives.

关键词： Risk analysis Resource management Grid computing distributed computing Switches Maintenance Investments Laboratories Computer science software engineering

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distributed IDS using Reconfigurable Hardware

Distributed IDS using Reconfigurable Hardware

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2007 IEEE international parallel & distributed Processing symposium (IPDPS 2007), vol.8

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

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 Hardware Field programmable gate arrays Computer networks IP networks Computer crime High-speed networks software systems parallel processing Costs

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Direct Execution of Linux Binary on Windows for Grid RPC Workers

Direct Execution of Linux Binary on Windows for Grid RPC Wor...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Yoshifumi Uemura Yoshihiro Nakajima Mitsuhisa Sato Graduate School of Systems and Information Engineering University of Tsukuba Japan

Local area or campus-type networks consist of PCs using different operating systems such as Windows and Linux. These PCs are expected to have enormous potential computing power for grid computing. The majority of PCs in this type of environment run on Windows, while grid applications and middleware are often developed on Linux. The challenge is to absorb the heterogeneity of operating systems. Grid RPC is a promising programming model for the development of grid applications. We have designed and implemented an agent called BEE, which enables direct execution of Linux binary programs on Windows for a grid RPC worker. We have integrated the BEE agent into an OmniRPC system in order to make use of Windows PCs as computing resources in a hybrid grid environment combining Windows PCs into grid computing resources. The BEE agent allows Linux binaries of the program of the OmniRPC worker to be exported and run under Windows without any modification of its Linux binaries. The results of our experiments show that the performance of a worker program using BEE is almost the same as that of Windows native binary and Cygwin and is better that that of using VMware. We have demonstrated a hybrid grid environment combining Window PCs in a conventional grid of Linux nodes.

关键词： Linux Personal communication networks Grid computing Operating systems distributed computing Middleware software performance Computer networks Pervasive computing Power engineering and energy

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Packet Loss Burstiness: Measurements and Implications for distributed Applications

Packet Loss Burstiness: Measurements and Implications for Di...

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international symposium on parallel and distributed Processing (IPDPS)

作者： David X. Wei Pei Cao Steven H. Low Division of Engineering and Applied Science California Institute of Technology Pasadena CA USA Department of Computer Science University of Stanford Stanford CA USA

Many modern massively distributed systems deploy thousands of nodes to cooperate on a computation task. Network congestions occur in these systems. Most applications rely on congestion control protocols such as TCP to protect the systems from congestion collapse. Most TCP congestion control algorithms use packet loss as signal to detect congestion. In this paper, we study the packet loss process in sub-round-trip-time (sub-RTT) timescale and its impact on the loss-based congestion control algorithms. Our study suggests that the packet loss in sub-RTT timescale is very bursty. This burstiness leads to two effects. First, the sub-RTT burstiness in packet loss process leads to complicated interactions between different loss-based algorithms. Second, the sub-RTT burstiness in packet loss process makes the latency of data transfers under TCP hard to predict. Our results suggest that the design of a distributed system has to seriously consider the nature of packet loss process and carefully select the congestion control algorithms best suited for the distributed computation environments.

关键词： Loss measurement Protocols Extraterrestrial measurements Internet Control systems Data communication distributed computing Application software Algorithm design and analysis Propagation losses

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Analysis of Different Future Objects Update Strategies in ProActive

Analysis of Different Future Objects Update Strategies in Pr...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Nadia Ranaldo Eugenio Zimeo Department of Engineering University of Sannio Benevento Italy Research Centre on Software Technology University of Sannio Benevento Italy

In large-scale distributed systems, asynchronous communication and future objects are becoming wide spread mechanisms to tolerate high latencies and to improve global performances. Automatic continuation, that is the propagation of a future object outside the activity that has generated it, can be used to further increase concurrency at system level through the anticipation of tasks. An important aspect of automatic continuation, which can cause different performance in different application and deployment scenarios, is the mechanism for updating result values of future objects, when they are ready. In this paper, we analyze the behaviour of the implementation of different updating strategies, by comparing them with the one currently implemented in ProActive. The experimental results show that the lazy home-based strategy behaves better than other strategies in some application scenarios that are very common in distributed applications.

关键词： Concurrent computing Asynchronous communication distributed computing Java Delay Master-slave Protocols Programming profession Middleware Local area networks

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distributed, Reliable Restoration Techniques using Wireless Sensor Devices

Distributed, Reliable Restoration Techniques using Wireless ...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Yannis Drougas Vana Kalogeraki Department of Computer Science and Engineering University of California Riverside Riverside CA USA

Wireless sensor networks are small, inexpensive and flexible computational platforms, that have found popular applications in various areas including environmental monitoring, health care and disaster recovery. One fundamental question is how to place the nodes in the network so that complete coverage of the monitored area is achieved. In this paper, we use techniques from discrepancy theory that accurately represent the uncovered area using just a few discrete points, to make sure that every point in the network is covered by at least k sensors, where k is calculated based on user reliability requirements. Our technique is fully distributed, deploying a low number of sensors, and minimizes the communication costs. Our experiments demonstrate that our technique is highly effective in achieving a reliable restoration of a given sensor network area.

关键词： Wireless sensor networks Computer networks distributed computing Application software Computerized monitoring Medical services Telecommunication network reliability Costs Sensor systems Humans

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