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

共 305 条记录，以下是271-280 订阅

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Accelerating the HMMER sequence analysis suite using conventional processors

Accelerating the HMMER sequence analysis suite using convent...

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20th international conference on Advanced Information Networking and Applications

作者： Walters, John Paul Qudah, Bashar Chaudhary, Vipin Wayne State Univ Inst Comp Sci Detroit MI 48202 USA Wayne State Univ Elect & Comp Engn Detroit MI 48202 USA

ISBN: (纸本)0769524664

Due to the ever-increasing size of sequence databases it has become clear that faster techniques must be employed to effectively perform biological sequence analysis in a reasonable amount of time. Exploiting the inherent parallelism between sequences is a common strategy. In this paper we enhance both the fine-grained and course-grained parallelism within the HMMER [2] sequence analysis suite. Our strategies are complementary to one another and, where necessary, can be used as drop-in replacements to the strategies already provided within HMMER. We use conventional processors (Intel Pentium IV Xeon) as well as the freely available MPICH parallel programming environment [1]. Our results show that the MPICH implementation greatly outperforms the PVM HMMER implementation, and our SSE2 implementation also lends greater computational power at no cost to the user.

关键词： parallel processing systems

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Large files, small writes, and pNFS 06

Large files, small writes, and pNFS

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20th Annual international conference on Supercomputing, ICS 2006

作者： Hildebrand, Dean Ward, Lee Honeyman, Peter Center for Information Technology Integration University of Michigan Scalable Computing Systems Department Sandia National Laboratories

ISBN: (纸本)1595932828

Workload characterization studies highlight the prevalence of small and sequential data requests in scientific applications. parallel file systems excel at large data transfers but sometimes at the expense of small I/O performance. pNFS is an NFSv4.1 high-performance enhancement that provides direct storage access to parallel file systems while preserving NFSv4 operating system and hardware platform independence. this paper demonstrates that distributed file systems can increase write throughput to parallel data stores - -regardless of file size - -by overcoming parallel file system inefficiencies. We also show how pNFS can improve the overall write performance of parallel file systems by using direct, parallel I/O for large write requests and a distributed file system for small write requests. We describe our pNFS prototype and present experiments demonstrating the performance improvements. Copyright (c) 2006 ACM.

关键词： File organization

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A parallel classification method for genomic and proteomic problems

A parallel classification method for genomic and proteomic p...

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international conference on Advanced Information Networking and Applications (AINA)

作者： M.R. Guarracino C. Cifarelli O. Seref P.M. Pardalos National Research Council High Performance Computing and Networking Institute Italy Department of Statistic Probability and Applied Statistics University of Roma La Sapienza Italy Center for Applied Optimization University of Florida Gainesville FL USA

Classification is one of the most widely used method in data mining with numerous applications in biomedicine. the scope and the resolution of data involved in many real life applications require very efficient implementations of classification methods, developed to run on parallel or distributed computational systems. In this study, a parallel implementation of an efficient algorithm that is based on regularized general eigenvalue classification is introduced. the proposed implementation is tested on a very large scale genomic data base and preliminary results regarding efficiency are presented.

关键词： Genomics Bioinformatics Proteomics Data mining Biomedical computing Concurrent computing distributed computing Eigenvalues and eigenfunctions Testing Large-scale systems

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SMTPS keynote: research and technology advances in systems aoftware for large scale computing systems 06

SMTPS keynote: research and technology advances in systems a...

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Proceedings of the 20th international conference on parallel and distributed processing

作者： Frederica Darema NSF CISE Arlington VA

No abstract available.

ISBN: (纸本)9781424400546

No abstract available.

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A routing load balancing policy for grid computing environments

A routing load balancing policy for grid computing environme...

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international conference on Advanced Information Networking and Applications (AINA)

作者： R.F. de Mello L.J. Senger L.T. Yang Institute of Mathematic Sciences and Computer University of São Paulo Sao Paulo Brazil Department of Information Technology State University of Ponta Grossa Ponta Grossa Brazil Department of Computer Science Saint Francis Xavier University Antigonish NS Canada

the evolution of computers and networks has motivated the development of high performance systems using the distributed system concepts. Such evolution has motivated the study of load balancing techniques, low latency protocols, operating systems and middlewares. Furthermore, the evolution from distributed systems based on clusters to grid environments has motivated new researches to define load balancing algorithms to support scalable and heterogeneous computing capacity environments. In this paper, the route load balancing algorithm is proposed, presented and evaluated. this algorithm is designed to equally distribute the workload of tasks of parallel applications over grid computing environments. Experiments compare the performance of the proposed algorithm to others from literature. the obtained results allow concluding that the route algorithm is indicated for environments where there are several heterogeneous computers and parallel applications are composed of multiple tasks.

关键词： Routing Load management Grid computing Clustering algorithms distributed computing Application software Computer networks High performance computing Delay Protocols

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Multi-Node Global Directory Construction in Peer-to-Peer systems

Multi-Node Global Directory Construction in Peer-to-Peer Sys...

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international conference on Advanced Information Networking and Applications (AINA)

作者： InSung Kang HongSoo Kim SungJin Choi MaengSoon Baik ChongSun Hwang Distributed Systems Laboratory Department of Computer Science and Engineering Korea University Seoul South Korea

In P2P systems, the speed of searching for desired lists of sharable files is one of the most important measurement issues in evaluation of overall system performance. Although the searching schemes of existing non-structured P2P systems have been improved to enhance speed considerably, they still never reach to the level of those of the centralized and structured systems. In this paper, we propose a multi-node global directory in P2P systems, where all the lists of sharable resources of the joining peers are aggregated and divided into the chosen nodes while keeping collating sequence as a whole to make one big linked list. thus in indexed sequential searching, the system provides us with convenience of using the command like 'dir' of MS-DOS, and in general keyword searching, which is naturally impossible for the structured P2P systems, the searching speed is even faster than those of centralized P2P systems since a small list segment is scanned at each node synchronously in parallel

关键词： Peer to peer computing Keyword search System performance Laboratories Computer science Velocity measurement Power generation economics Machine vision Bandwidth Memory

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HAMS: heterogeneous asynchronous multi-source streaming protocol to realize scalable multimedia communications

HAMS: heterogeneous asynchronous multi-source streaming prot...

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international conference on Advanced Information Networking and Applications (AINA)

作者： S. Itaya N. Hayashibara T. Enokido M. Takizawa Department of Computers and Systems Engineering Tokyo Denki University Japan Faculty of Business Administration Rissho University Japan

In a peer-to-peer (P2P) overlay network, a large number and various types of peers are cooperating by exchanging multimedia contents. Here, multimedia streaming is a key technology to realize multimedia applications. A multimedia content is distributed to multiple peers and these peers named contents peers can support other leaf peers with the content. Multimedia contents are required to be efficiently delivered to processes in a real-time manner. Some contents peer may not send packets at a required rate and a communication channel may not support enough quality of service (QoS). In this paper, we newly discuss a heterogeneous asynchronous multi-source streaming (HAMS) model where multiple contents peers in parallel transmit packets of a multimedia content to a requesting leaf peer to realize highly reliability and scalability.

关键词： Streaming media Protocols Multimedia communication Multimedia systems Peer to peer computing Quality of service Computer networks Communication channels Scalability Motion pictures

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Dual-layered file cache on cc-NUMA system 06

Dual-layered file cache on cc-NUMA system

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Proceedings of the 20th international conference on parallel and distributed processing

作者： Yingchao Zhou Dan Meng Jie Ma National Research Center for Intelligent Computing Systems Institute of Computing Technology Chinese Academy of Sciences Beijing P.R. China and Graduate School of the Chinese Academy of Sciences National Research Center for Intelligent Computing Systems Institute of Computing Technology Chinese Academy of Sciences Beijing P.R. China

ISBN: (纸本)9781424400546

CC-NUMA is a widely adopted and deployed architecture of high performance computers. these machines are attractive for their transparent access to local and remote memory. However, the prohibitive latency gap between local and remote access deteriorates applications' performance seriously due to memory access stalls. File system cache, especially, being shared by all processes, inevitably triggers many remote accesses. To address this problem, we suggest and implement a mechanism that uses local memory to cache remote file cache, of which the main purpose is to improve data locality. Using realistic workload on a two-node cc-NUMA machine, we show that the cost of such a mechanism is as low as 0.5%, the performance can be increased 14.3% at most, and the local hit ratio can be improved as much as 40%.

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Dynamic multi phase scheduling for heterogeneous cluste 06

Dynamic multi phase scheduling for heterogeneous cluste

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Proceedings of the 20th international conference on parallel and distributed processing

作者： Florina M. Ciorba theodore Andronikos Ioannis Riakiotakis Anthony T. Chronopoulos George Papakonstantinou Computing Systems Laboratory Dept. of Electrical and Computer Engineering National Technical University of Athens Athens Greece Dept. of Computer Science University of Texas at San Antonio San Antonio TX

ISBN: (纸本)9781424400546

distributed computing systems are a viable and less expensive alternative to parallel computers. However, concurrent programming methods in distributed systems have not been studied as extensively as for parallel computers. Some of the main research issues are how to deal with scheduling and load balancing of such a system, which may consist of heterogeneous computers. In the past, a variety of dynamic scheduling schemes suitable for parallel loops (with independent iterations) on heterogeneous computer clusters have been obtained and studied. However, no study of dynamic schemes for loops with iteration dependencies has been reported so far. In this work we study the problem of scheduling loops with iteration dependencies for heterogeneous (dedicated and non-dedicated) clusters. the presence of iteration dependencies incurs an extra degree of difficulty and makes the development of such schemes quite a challenge. We extend three well known dynamic schemes (CSS, TSS and DTSS) by introducing synchronization points at certain intervals so that processors compute in pipelined fashion. Our scheme is called dynamic multi-phase scheduling (DMPS) and we apply it to loops with iteration dependencies. We implemented our new scheme on a network of heterogeneous computers and studied its performance. through extensive testing on two real-life applications (the heat equation and the Floyd-Steinberg algorithm), we show that the proposed method is efficient for parallelizing nested loops with dependencies on heterogeneous systems.

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Scalable Switch for bi-Directional MultiRing Network 17

Scalable Switch for bi-Directional MultiRing Network

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17th international conference on parallel and distributed computing systems, pdcs 2004

作者： Arabnia, Hamid R. He, Xiangjian Department of Computer Science University of Georgia AthensGA30602 United States Department of Computer Systems University of Technology PO Box 123 Broadway 2007 Sydney Australia

ISBN: (纸本)9781618398185

MultiRing is a network of 2nnodes which can be configured into different ring networks of n different configurations. It supports a wide variety of algorithms, such as algorithms for parallel image processing. In this paper, a MultiRing is implemented using a star topology with a MultiRing switch at the centre. We present a hierarchical design of the MultiRing switch. We demonstrate that the construction of the switch is economical in terms of gate count and port numbers. Our design preserves the need that all nodes can communicate simultaneously and independently in a ring configuration. We show that our design is scalable. © (2004) by the international Society for Computers and their Applications All rights reserved.

关键词： Image processing

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