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共 506 条记录，以下是191-200 订阅

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Metrics for distributed C3 systems: Rationale and approach

Metrics for distributed C3 systems: Rationale and approach

引用

1993 IEEE Workshop on advances in parallel and distributed Systems, APADS 1993

作者： Bhatt, D. Denz, M. Norton, J. Kim, K. Honeywell Technology Center 3660 Technology Drive MinneapolisMN55418 United States Rome Laboratory 525 Brooks Road Griffiss AFBNY13441 United States Dept. of ECE Univ. of California IrvineCA92717 United States

ISBN: (纸本)0818652500

The empirical nature of distributed computing techniques used in developing Command, Control, and Communication (C3) systems requires a comprehensive definition, implementation, and usage of metrics to ascertain how the system meets its functional and performance requirements. The additional objectives of adaptive fault-resistance and resource management need new metrics that are dynamically implementable. The authors present rationale/needs of metrics and an approach to their development and usage. This approach is based upon a framework that covers various aspects of metrics including usage across system life-cycle, metrics views across system functions and levels of abstraction, and instrumentation architecture/tools for implementation. © 1993 IEEE.

关键词： distributed computer systems

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High performance parallel file objects 6

High performance parallel file objects

引用

6th distributed Memory computing Conference, DMCC 1991

作者： Grimshaw, Andrew S. Prem, Jeff Department of Computer Science University of Virginia CharlottesvilleVA22901 United States

ISBN: (纸本)0818622903

High performance parallel computers are expected to solve problems involving very large data sets, often far larger than can fit in primary memory. If I/O is not performed intelligently, then the wait for I/O can become a serious bottleneck, limiting the gains from improved processor technology. This paper introduces ELFS (Extensible File Systems). ELFS is a parallel, asynchronous I/O system designed to attack the I/O bottleneck. It combines recent technological advances in three areas: object-oriented systems design, latency obscuring compiler technology, and parallel disk arrays attached to parallel architectures. We present the ELFS class pf o (parallel file object), a parallel 2D-matrix class. Pfo's allow the user to: 1) specify the access pattern, e.g., row-wise, column-wise, or by sub-blocks;2) partition the pf o into sub-pfos defined by subsets of the original file structure, and specify where the new sub-pfo should be located;and 3) access the file in an asynchronous and pipelined manner. Preliminary performance results are presented. © 1991 IEEE.

关键词： parallel architectures

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parallel computation for luc cryptosystems on distributed memory multiprocessor machine

Parallel computation for luc cryptosystems on distributed me...

引用

4th IASTED International Conference on advances in Computer Science and Technology, ACST 2008

作者： Ali, Zulkarnain Md Othman, Mohamed Said, Mohd Rushdan Muhd Sulaiman, Mohammad Nasir Department of Computer Science Universiti Kebangsaan Malaysia 43600 Bangi Selangor Malaysia

ISBN: (纸本)9780889867307

Cryptosystem based on Lucas Function is known as LUC Cryptosystems. Lucas Function is a special form of second order linear recurrence relation using a large public integer as a modulus. We are sure that, an existing computation technique will suffer a huge computations time and spaces when calculating a very large size of public-key and private-key. Recently, a method for fast LUC Cryptosystems computation on single processor has been proposed. In this paper, we extend the method in parallel on distributed memory multiprocessor machine using message-passing interface. We are generating a special sequence from a given value of public-key and private-key. This special sequence will be used to direct the computation of LUC. We examine the parallelism efficiency of the algorithm by analyze the simulation time and speedup.

关键词： Message passing

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parallel genetic algorithms in a networked workstation environment

Parallel genetic algorithms in a networked workstation envir...

引用

proceedings of the 1997 5th International Conference on the Application of High-Performance Computers in Engineering, HPC

作者： Oliveira, Vitor Pina, Antonio Proenca, Alberto Universidad do Minho Braga Portugal

parallel Genetic Algorithms are suited to deal with problems with very large solution spaces and they can support efficient parallel distribution of work. In a PGA Island Model the migration strategy can take advantage of high latency communication channels in a distributed system. This approach suggests the use of networked workstation environments as a cost effective alternative to MPP systems. A Genetic Algorithm Programming System (GAPS) was developed to evaluate the proposed approach, which supports the design of parallel genetic programs and its execution in a distributed workstation environment. GAPS separates the specification of the problem and the user application interface, from the implementation and management details of the run-time environment;it also addresses fault tolerance, needed to recover from a fault that may occur in a dynamic network of heterogeneous workstations. GAPS uses PVM to implement a structural load balance strategy, which distributes complex evaluation functions with large chromosomes across a parallel machine. The proposed system showed to be effective when tested with the knapsack problem.

关键词： parallel algorithms

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A Load-Balancing Strategy Based on Multi-Task Learning in a distributed Training Environment 4

A Load-Balancing Strategy Based on Multi-Task Learning in a ...

引用

4th International Conference on advances in Electrical Engineering and Computer Applications, AEECA 2023

作者： Huang, Yinqi Zhou, Wenjiang Li, Liang Lyu, Ting Xu, Haitao Univerisity of Science and Technology Beijing School of Computer and Communication Engineering Beijing China China Academy of Information and Communications Technology Beijing China Shunde Innovation School Univerisity of Science and Technology Beijing School of Computer and Communication Engineering Beijing China

ISBN: (纸本)9798350308082

With the development of machine learning and big data technologies, distributed training has become an important way to improve computational efficiency. However, in the distributed training environment, the performance difference between workers and the interference of unrelated tasks may lead to the uneven load of the system and cause the 'straggler phenomenon'. Therefore, how to solve the straggler phenomenon and achieve load balancing of the system is a pressing problem of distributed training. To address the shortcomings of the existing parallel computing model DSSP, this paper proposes a load-balancing strategy for DDP, which effectively reduces the load difference by adjusting the batch size and data size of workers in the training process. Then, to explore the correlation between data size in DDP and synchronization threshold in DSSP in dynamic adjustment, we perform multi-task learning for the two dynamic adjustment strategies and integrate the proposed Joint Multi-Task Prediction scheme on DSSP to implement a new parallel computing model ESP. extensive experiments The results show that ESP can not only guarantee the model accuracy but also effectively improve the training speed in distributed training. © 2023 IEEE.

关键词： Computational efficiency

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Efficient implementation of lazy reevaluation

Efficient implementation of lazy reevaluation

引用

proceedings of the 25th Annual Simulation Symposium

作者： Palaniswamy, Avinash C. Aji, Sandeep Wilsey, Philip A. Univ of Cincinnati Cincinnati United States

ISBN: (纸本)0818627654

advances in distributed computing have resulted in the design of fast simulators for digital systems. A parallel, optimistically synchronized (Time Warp) digital systems simulator using VHDL as the hardware description language has been developed at the University of Cincinnati. The simulator incorporates several optimizations to the time wrap mechanism, including lazy cancellation, flow control, lazy rollback, lazy reevaluation, and rollback relaxation. This paper presents an efficient implementation of lazy reevaluation which has historically been too computationally expensive for effective utilization. The realization of this optimization as proposed in this paper results in an identification of only a subset of the total forward jumps that are possible in lazy reevaluation.

关键词： distributed computer systems

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Application of grid computing in petroleum exploration

Application of grid computing in petroleum exploration

引用

5th International Conference on Grid and Cooperative computing (GCC 2006)

作者： Li Weidong Zhao Gaishan Wei Hailiang Xie Xianghui Wang Yujing Zhou Huiqing Jiangnan Inst Comp Technol Wuxi 214083 Peoples R China SINOPEC Inst Geophys Inst Nanjing 210014 Peoples R China

ISBN: (纸本)0769526950

Grid computing is becoming practicable, open and standard. Around the world a lot of grid projects and initiatives are being implemented, and many of them tend to be productive. There are several production ready grid softwares such as Globus Toolkit and UNICORE. Grid will become the information infrastructure of workflow in the petroleum industry. advances in grid computing will meet the tremendous and scalable demands of petroleum E&P for high performance computing: This paper describes the architecture, key technology and application of SeisGrid.

关键词： grid computing petroleum E&P SeisGrid

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An integration of biometrics and mobile computing for personal identification

引用

3rd International Conference on advances in Pattern Recognition

作者： You, J Cheung, KH Li, Q Bhattacharya, P Hong Kong Polytech Univ Dept Comp Hong Kong Hong Kong Peoples R China Concordia Univ Concordia Inst Informat Syst Engn Montreal PQ Canada

ISBN: (纸本)3540288333

This paper presents a new approach to efficient and effective personal identification for the security of network access by combining techniques in biometrics and mobile computing. To overcome the limitations of the existing password-based authentication services on the Internet, we propose a dynamic feature selection scheme to extract multiple personal features and integrate them in a hierarchical structure for fast and reliable identity authentication. To increase the speed and flexibility of the process, we use mobile agents as a navigational tool for parallel implementation in a distributed environment, which includes hierarchical biometric feature extraction, multiple feature integration, dynamic biometric data indexing and guided search.

关键词： biometrics computing feature extraction and indexing guided search identity authentication and verification mobile computing

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Data staging effects in wide area task farming applications

Data staging effects in wide area task farming applications

引用

1st IEEE/AMC International Symposium on Cluster computing and the Grid

作者： Elwasif, WR Plank, JS Wolski, R Oak Ridge Natl Lab Distributed Comp Grp Oak Ridge TN 37831 USA

ISBN: (纸本)0769510116

Recent advances in computing and communication have given rise to the computational grid notion. The core of this computing paradigm is the design of a system for drawing compute power from a confederation of geographically dispersed heterogeneous resources, seamlessly and ubiquitously. If high-performance levels are to be achieved, data locality must be identified and managed. In this paper, we consider the effect of sen,er side staging on the behavior of a class of wide area "task farming" applications. We show that staging improves task throughput mainly through the increased parallelism rather than the reduction in overall turnaround time per task. We derive a model for farming applications with and without server side staging and verify the model through live experiments as well as simulations.

关键词： Computer architecture

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Optimization of the POLCOMS hydrodynamic code for terascale high-performance computers

Optimization of the POLCOMS hydrodynamic code for terascale ...

引用

proceedings - 18th International parallel and distributed Processing Symposium, IPDPS 2004 (Abstracts and CD-ROM)

作者： Ashworth, M. Holt, J.T. Proctor, R. CCLRC Daresbury Laboratory Warrington WA4 4AD United Kingdom Proudman Oceanographic Laboratory Bidston Observatory Birkenhead CH43 7RA United Kingdom

ISBN: (纸本)0769521320

advances in computational science are closely tied to developments in high-performance computing. We consider the case of shelf sea modelling where models have been growing in complexity and where model domains have been growing and grid resolutions shrinking in pace with the increasing storage capacity and computing power of high-end systems. Terascale systems are now readily available with performance levels measurable in TeraFlop/s and memories counted in TeraBytes. The scientific case is now being made for regional models at 1km resolution, allowing the accurate representation of eddies, fronts and other regions containing steep gradients. The hydrodynamic model is increasingly being coupled with other models in multidisciplinary studies e.g. ecosystem modelling and wave modelling. We show that the performance attainable from the POLCOMS hydrodynamic code is measurable at about 0.5 TeraFlop/s on an IBM p690 cluster with 1024 processors. The scalability on this system and others is excellent up to 1000 processors. We describe a wide range of optimisations which have together enabled this code to reach these performance levels.

关键词： parallel processing systems

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