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检索条件"任意字段=20th International Conference on Parallel and Distributed Computing Systems, PDCS 2007"

共 306 条记录，以下是21-30 订阅

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Design Considerations for Resilient distributed Data Centers 20

Design Considerations for Resilient Distributed Data Centers

引用

20th international conference on parallel and distributed computing systems, pdcs 2007

作者： Khalil, Yehia H. Kumar, Anup Elmaghraby, Adel University of Louisville LouisvilleKY United States

ISBN: (纸本)9781604233926

A distributed data center and its quality of services (QoS) is an important element of information technology infrastructure. Data centers are required to support the critical business application continuity by providing the highest level of data availability, integrity, and data consistency. Another aspect of distributed data center QoS is real time backup and recovery process. Traditionally data center mangers rely on different techniques to keep the data centers continually working and avoid any unexpected downtime such as redundant hardware and local backup sites. In this work we investigate the correlation between the different performance parameters related to network, mirroring technology, data center, and the system resilience. © 20th international conference on parallel and distributed computing systems, pdcs 2007. All rights reserved.

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parallel–TCOFFEE: A parallel MULTIPLE SEQUENCE ALIGNER 20

PARALLEL–TCOFFEE: A PARALLEL MULTIPLE SEQUENCE ALIGNER

引用

20th international conference on parallel and distributed computing systems, pdcs 2007

作者： Zola, Jaroslaw Yang, Xiao Rospondek, Adrian Aluru, Srinivas Iowa State University Dept. ECE AmesIA50011 United States Iowa State University BCB Program AmesIA50011 United States Czestochowa Univ. of Tech. Inst. of Comp. & Inf. Sci. Czestochowa42200 Poland

ISBN: (纸本)9781604233926

In this paper we present a parallel implementation of T–Coffee — a widely used multiple sequence alignment package. Our software supports a majority of options provided by the sequential program, including the 3D–coffee mode, and uses a message passing paradigm to distribute computations and memory. the main stages of T–Coffee, that is library generation and progressive alignment, have been parallelized and can be executed on distributed memory machines. Using our parallel software we report alignments of data sets consisting of hundreds of protein sequences, which is far beyond the capability of the sequential T–Coffee program. © 20th international conference on parallel and distributed computing systems, pdcs 2007. All rights reserved.

关键词： Alignment

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the Performance of parallel Prefix Adders on Nanometer FPGA 20

The Performance of Parallel Prefix Adders on Nanometer FPGA

引用

20th international conference on parallel and distributed computing systems, pdcs 2007

作者： Kharbash, F. Chaudhry, G. CSEE Department University of Missouri - Kansas City 5100 Rockhill Road Kansas CityMO64110 United States

ISBN: (纸本)9781604233926

Carry computation is a major performance bottleneck in many high-performance digital applications. Many of the digital application use adders implicitly or explicitly in their internal architecture, and with use of Filed Programmable Gate Arrays (FPGA) as an implementation platform, the choice of an adder becomes very crucial. thus, it is important to carefully select an adder architecture that will maximize the overall system performance at early design stage. In this paper, we investigated the implementation of five adder architectures (Ripple-Carry, Carry Look-Ahead, Brent-Kung, Kogge-Stone and Han-Carlson) on Virtex-5 FPGA that is built using the 65nm process technology. the presented results are of importance since they give an early direction for proper adder selection and integration in the design. © 20th international conference on parallel and distributed computing systems, pdcs 2007. All rights reserved.

关键词： Adders

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DYNAMIC MAPPING AND DEPLOYMENT OF INDEPENDENT TASKS ON distributed systems USING RESIDUAL EXECUTION TIME 20

DYNAMIC MAPPING AND DEPLOYMENT OF INDEPENDENT TASKS ON DISTR...

引用

20th international conference on parallel and distributed computing systems, pdcs 2007

作者： Khalifa, Amal S. Ammar, Reda A. Fergany, Tahany A. Tolba, Mohammed F. Faculty of Computer & Information Sciences Ain Shams University Abbassia Cairo Egypt Computer Science & Engineering Department University. of Connecticut StorrsCT United States Computer Science Department University of New Haven West HavenCT United States

ISBN: (纸本)9781604233926

Mapping and scheduling are complex computational problems. they are known to be NP-Complete except under a few special situations. there is a wide variety of approaches to the problem of mapping and scheduling in HC systems that are either static or dynamic. In this paper, we propose a preemptive (migratory) dynamic mapping technique that is based on the famous Min-min heuristic. In our approach, we added a deployment step to allow dynamic reallocation of running tasks to improve the overall performance of the HC system. the reallocation (migration) decisions are taken based on the expected residual execution times for the suspended tasks. the goal is to minimize the total execution time (makespan) of the metatask. © 20th international conference on parallel and distributed computing systems, pdcs 2007. All rights reserved.

关键词： Scheduling

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A Performance-Effective Task Scheduling Algorithm for Multiprocessor computing systems 20

A Performance-Effective Task Scheduling Algorithm for Multip...

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20th international conference on parallel and distributed computing systems, pdcs 2007

作者： Maksoud, Ehab Abdel Ammar, Reda Engineering Mathematics Department Cairo University Cairo Egypt Computer Science and Engineering University of Connecticut StorrsCT06250 United States

ISBN: (纸本)9781604233926

Scheduling is one of the critical design issues of multiprocessor computing systems. Meeting real-time deadlines and achieving high resource utilization are the two main goals of task scheduling. In this paper, we present a heuristic approach for processing power utilization to schedule a set of independent real-time tasks in a multiprocessor system. In this set, each task is characterized by its arrival time and the required deadline and processing power. In contrast to the traditional approach that uses a fixed processing power reservation, the proposed approach is based on distributing the total available processing power of any processor, if it is possible, among more than one task to execute them on that processor simultaneously. Sharing processing power among different tasks can be used as a good tool to efficiently utilize system resources while satisfying real-time constraints. © 20th international conference on parallel and distributed computing systems, pdcs 2007. All rights reserved.

关键词： Real time systems

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IMPROVING PERFORMANCE of COLLECTIVE OPERATIONS: UPC CASE 20

IMPROVING PERFORMANCE of COLLECTIVE OPERATIONS: UPC CASE

引用

20th international conference on parallel and distributed computing systems, pdcs 2007

作者： Salama, Rafik A. Sameh, Ahmed Department of Computer Science The American University in Cairo Egypt

ISBN: (纸本)9781604233926

the collective operations of any parallel programming language involve more than one thread/process and act on multiple streams of data. the language’s API provides both algorithmic and run-time system support to optimize the performance of these operations. Some developers, however, choose to play clever and start from the language’s primitive operations and write their own versions of the collective operations. the question that always pops up: Are these developers wise? In this paper, we check the case of UPC (Universal parallel C) and prove that in some circumstances, it is wiser for developers to optimize starting from UPC’s primitive operations. In our testing we found out that optimization using primitive UPC operations by the developers can have better performance than readily available UPC’s collective operations. In this paper, we pin point specific optimizations at both the algorithmic and the runtime support levels that developers could use to uncover missed optimization opportunities. © 20th international conference on parallel and distributed computing systems, pdcs 2007. All rights reserved.

关键词： parallel programming

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Supporting Geographic Data in the Mobile computing Environment 20

Supporting Geographic Data in the Mobile Computing Environme...

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20th international conference on parallel and distributed computing systems, pdcs 2007

作者： Miller, Les Ming, Hua Tsai, Hsine-Jen Wemhoff, Becca Nusser, Sarah Department of Computer Science Iowa State University AmesIA50011 United States Department of Information Management Fu Jen Catholic University Taipei Taiwan Department of Statistics Iowa State University AmesIA50011 United States

ISBN: (纸本)9781604233926

Geographic data is becoming a critical part of mobile computing applications. In the mobile environment, geographic data plays an especially important role. A mobile computer can either be a user or a creator of geographic data. Mobile applications can make use of downloaded maps to help the user navigate her/his surroundings or geographic data may be downloaded for use in the application. Collection of geographic data can benefit greatly from the computing device being on the ground at the site for which the data is being collected. Both government agencies and companies are finding it valuable to push computing into the field. the present work looks at the GeoGrid model for supporting geographic data in the mobile environment. © 20th international conference on parallel and distributed computing systems, pdcs 2007. All rights reserved.

关键词： Mobile computing

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A PERFORMANCE-DRIVEN CLUSTERING APPROACH TO MINIMIZE COUPLING IN A distributed OBJECT ORIENTED SYSTEM 20

A PERFORMANCE-DRIVEN CLUSTERING APPROACH TO MINIMIZE COUPLIN...

引用

20th international conference on parallel and distributed computing systems, pdcs 2007

作者： Hamad, Safwat H. Ammar, Reda A. Abd El-Raouf, Amal A. Khalifa, Mohamed E. Faculty of Computer & Information Sciences Ain Shams University Abbassia Cairo11566 Egypt Computer Science & Engineering Department University. of Connecticut StorrsCT06269 United States Computer Science Department Southern Connecticut State University New HavenCT06515 United States

ISBN: (纸本)9781604233926

An important step in designing distributed Object Oriented (DOO) systems is to decide upon object locations and communication methods. At this stage, it may be necessary to use tools to allow analysis of the communication patterns among objects in order to take the right decision. In this paper, we present an approach for decomposing object-oriented systems into subsystems that have low coupling and are more suitable for distribution. We use distributed Object-Oriented performance (DOOP) model as a technique for the assessment of relationships between system classes. Next, we propose a graph clustering technique based on recursive graph bi-partitioning to create a suggested grouping of subsystems that are convenient for guiding the allocation of the subsystems to the set of available machines in a distributed environment. © 20th international conference on parallel and distributed computing systems, pdcs 2007. All rights reserved.

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AN AUTONOMIC ELEMENT DESIGN FOR A distributed OBJECT SYSTEM 20

AN AUTONOMIC ELEMENT DESIGN FOR A DISTRIBUTED OBJECT SYSTEM

引用

20th international conference on parallel and distributed computing systems, pdcs 2007

作者： Fuad, M. Muztaba Deb, Debzani Oudshoorn, Michael J. Department of Computer Science Winston-Salem State University Winston-SalemNC27110 United States Department of Computer Science Montana State University BozemanMT59717 United States College of Science Mathematics & Tech. University of Texas at Brownsville BrownsvilleTX78520 United States

ISBN: (纸本)9781604233926

Current research in autonomic computing suffers from the lack of a common definition of the basic autonomic entities. Defining and developing the basic autonomic entities and making it publicly available would greatly simplify prototyping of different self-management techniques and permit autonomic techniques to be compared and benchmarked. Although different aspects of autonomic computing are explored in isolation, the structural operation of an autonomic element itself has not been completely modeled. this paper presents a self regulating design of an autonomic element in a distributed object environment. the goal of this architectural design is to provide an easy to program autonomic element which can be implemented in most domains with only minor modifications. Profiling and experimentation with this design shows that it is lightweight and performs smoothly without causing deadlock (since all internal communication and data structures are deadlock resistant) or producing excessive overhead. © 20th international conference on parallel and distributed computing systems, pdcs 2007. All rights reserved.

关键词： Autonomic computing distributed system object orientation

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FT-OpenVZ: A Virtualized Approach to Fault-Tolerance in distributed systems 20

FT-OpenVZ: A Virtualized Approach to Fault-Tolerance in Dist...

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20th international conference on parallel and distributed computing systems, pdcs 2007

作者： Walters, John Paul Chaudhary, Vipin Department of Computer Science & Engineering The University at Buffalo The State University of New York BuffaloNY United States

ISBN: (纸本)9781604233926

We present FT-OpenVZ, a full checkpointing and fault-tolerant solution for virtual private server (VPS) distributed computing. FT-OpenVZ extends OpenVZ’s VPS checkpointing to include full VPS checkpointing for MPI applications, including incremental file system checkpointing and user-assisted restart of checkpoints. With our solution, we extend the state of virtual machine/VPS fault-tolerance to any MPI-based distributed solution. By checkpointing all child processes, threads, and files within a distributed system, we provide a framework for future fault-tolerance work. For added resiliency to node failure, we include checkpoint replication and show that its use dramatically decreases the burden of checkpointing on network storage/centralized storage solutions. Using replication, FT-OpenVZ eliminates any need for network storage or centralized servers, reducing the impact of checkpointing on non-participating cluster nodes/users. Further, we show that by using replication our solution is scalable, where network storage and centralized server-based solutions are not. Our analysis is based on the NAS parallel Benchmarks with cluster sizes up to 64 nodes. Using these benchmarks we examine the overhead of checkpointing with replication, demonstrating low overhead for virtualized checkpointing. © 20th international conference on parallel and distributed computing systems, pdcs 2007. All rights reserved.

关键词： Fault tolerance

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