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Structuring the Model of Complex System Using parallel Computing techniques 1

15th international conference on Computer Aided Systems Theory

作者： Nikodem, Jan Wroclaw Univ Technol Dept Comp Engn PL-50370 Wroclaw Poland

ISBN: (数字)9783319273402

ISBN: (纸本)9783319273402;9783319273396

The contribution of this paper is to present a results of applications of set theory and relations in modeling a complex distributed systems, based on parallel computing platform. The advantages of using the set theory are: the possibility of a formal examination of the local problems, and the possibility to organize individuals as elements of the considered classes, defined globally. To govern the collective behavior we propose three key relations and mappings determined taxonomic order on them. That can insulate us from reductionism and single-cause thinking, as people deal with complexity before. On three examples, we show how take advantage of the new parallel programming tools to obtain more effective multiple inputs in parallel way, than assigning sequentially single causes for any outputs.

关键词： Modeling of complex system parallel computing Relations

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Restructuring and Implementations of 2D Matrix Transpose Algorithm Using SSE4 Vector Instructions 1

Restructuring and Implementations of 2D Matrix Transpose Alg...

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international conference on Applied Research in Computer Science and Engineering (ICAR)

作者： Zekri, Ahmed S. Beirut Arab Univ Fac Sci Dept Math & Comp Sci Beirut Lebanon

ISBN: (纸本)9781467385435

Current general-purpose processors are augmented with vector instructions that can process many elements of matrices and vectors in parallel. Transposing a matrix in-place is a main kernel operation required by many scientific and engineering applications to shuttle data before, during, or after processing. This operation increases the traffic on the memory bus and hence clever techniques such as blocking are required to enhance the performance. In this paper, we present an enhanced version of a previously published algorithm for transposing a matrix on a two-dimensional processor arrays. We restructured this algorithm to fit the one-dimensional vector register architecture augmented to general-purpose CPUs. We implemented the new vector algorithm using Intel SSE4 vector instruction set and compare its performance with the standard sequential algorithm in addition to an already employed implementation of Ekhlundh's algorithm. We also studied the automatic compiler optimizations and their effect on the vectorization of the algorithm. The best of our implementations showed a maximum speedup of 1.6 compared with the sequential algorithm, and an almost equal performance compared with Eklundh's algorithm implementation.

关键词： instruction sets mathematics computing matrix algebra optimising compilers parallel processing 2D matrix transpose algorithm Ekhlundh algorithm Intel SSE4 vector instruction set automatic compiler optimization general-purpose CPU general-purpose processor memory bus one-dimensional vector register architecture standard sequential algorithm two-dimensional processor arrays Kernel Multicore processing parallel processing Program processors Registers Signal processing algorithms Yttrium parallel processing (COMPUTERS) instruction sets mathematics computing Program processors Signal processing algorithms Registers matrix algebra Rare earths yttrium sequential algorithm Kernel general processor

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Multi level parallelism of Multiple implicitly/explicitly restarted Arnoldi methods for post-petascale computing

Multi level parallelism of Multiple implicitly/explicitly re...

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8th international conference on P2P, parallel, Grid, Cloud and Internet Computing (3PGCIC)

作者： Tsuji, Miwako Dandouna, Makarem Emad, Nahid Univ Versailles PRiSM Versailles France

ISBN: (纸本)9780769550947

The iterative methods are widely used to solve eigen problems in scientific computation. We focus on multiple restarted Arnoldi methods (MRAM) [4] which manage iterative co-methods to accelerate their convergence. These methods are considered as good candidate for emerging large scale computational systems thanks to their asynchronous communication schema, their potential load balancing and their multi-level parallelism. Both coarse grain parallelism between co-methods and fine grain parallelism inside each co-method need to be flexibly mapped to large scale distributed memory systems like hierarchical supercomputer, the cloud or P2P platforms. In this paper, we investigate such possibility in MRAMs by developing and executing them with a development and execution environment called FP2C (Framework for Post-Petascale Computing) [11]. The FP2C is a user-friendly and hierarchical-system-oriented development and execution environment based on workflow and distributed parallel methodologies. Our first goal is to show the feasibility of the approach FP2C to realize complex applications such as MRAMs. The next objective of the paper is to point out the adaptability of MRAMs to new generation of supercomputers (Petascale and futur Exascale). In addition, we show by our experiments that, collaboration of multiple iterative methods based on coarse grain parallelism accelerates convergence, and co-working processors within each iterative method based on fine grain parallelism accelerates the time per iteration.

关键词： iterative methods parallel machines parallel processing peer-to-peer computing

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A distributed PMU for Electrical Substations With Wireless Redundant Process Bus

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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 2015年第5期64卷 1149-1157页

作者： Castello, Paolo Ferrari, Paolo Flammini, Alessandra Muscas, Carlo Pegoraro, Paolo Attilio Rinaldi, Stefano Univ Cagliari Dept Elect & Elect Engn I-09124 Cagliari Italy Univ Brescia Dept Informat Engn I-25100 Brescia Italy

Protection and measurement systems in electrical substations are required to have high availability. In an all-digital substation protection system, all the components (instrument transformers, processing units, merging units, intelligent electronic devices, communication network, and synchronization source) may affect the overall availability level. In this paper, a solution to enhance distributed PMU availability, during wired network failures, is presented. In the proposed scheme, the process bus has two parallel networks: 1) the classic wired Ethernet link and 2) a wireless link (implemented with industrial grade IEEE 802.11 devices), for sampled values packets, which carry measurement information. The time synchronization is carried out only through the wired Ethernet link, but the proposed solution is still able to compensate temporary failures of one of the communication links. Experimental tests have been performed to verify the performance of additional IEEE 802.11 link using different protocols and configurations. Communication parameters that can affect the PMU performance, like propagation latency, are characterized. It is shown that, if the measurement algorithm is opportunely designed, depending on the wireless link quality, it is possible to comply, with a single output, with M and P classes of the synchrophasor standard also during network restoration or, at least, to safeguard protection applications if higher latency occurs.

关键词： Availability communication latency measure hybrid network IEEE 802.11 phasor measurement unit (PMU) process bus substation automation system (SAS) synchrophasor wireless LAN

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Scalable Repositories for Virtual Clusters

Scalable Repositories for Virtual Clusters

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15th international Euro-Par conference on parallel Computing

作者： Anedda, Paolo Leo, Simone Gaggero, Massimo Zanetti, Gianluigi CRS4 Distributed Comp Grp Polaris Pula Italy

ISBN: (纸本)9783642141218

For a large class of scientific data analysis applications it is becoming important, due to the sheer size of datasets, to have the option to perform the analysis directly where the data are stored, rather than on remote computational clusters. A possible strategy is the use of virtual clusters, thus guaranteeing a high degree of isolation from the underlying physical computational structure, and a very compact initial description. Deploying, saving and restoring HPC dedicated virtual clusters introduces, however, a different class of requirements on the virtual machines managing infrastructure, in particular for what concerns storage I/O requirements, whose scalability boundaries are easily reached. Here we discuss an alternative approach based on a storage model that leverages the WORM (write once, read many) character of the data used by VM management to increase, in a scalable way, the aggregate data bandwidth available to virtual cluster level operations and provide preliminary results indicating that it is a viable solution.

关键词： Cluster computing

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From Mathematical Model to parallel Execution to Performance Improvement: Introducing Students to a Workflow for Scientific Computing 24th

From Mathematical Model to Parallel Execution to Performance...

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international European conference on parallel and distributed Computing (Euro-Par)

作者： Kasielke, Franziska Tschueter, Ronny Tech Univ Dresden Fac Comp Sci D-01062 Dresden Germany Tech Univ Dresden Ctr Informat Serv & High Performance Comp D-01062 Dresden Germany

ISBN: (纸本)9783030105495;9783030105488

Current courses in parallel and distributed computing (PDC) often focus on programming models and techniques. However, PDC is embedded in a scientific workflow that incorporates more than programming skills. The workflow spans from mathematical modeling to programming, data interpretation, and performance analysis. Especially the last task is covered insufficiently in educational courses. Often scientists from different fields of knowledge, each with individual expertise, collaborate to perform these tasks. In this work, the general design and the implementation of an exercise within the course "Supercomputers and their programming" at Technische Universitat Dresden, Faculty of Computer Science is presented. In the exercise, the students pass through a complete workflow for scientific computing. The students gain or improve their knowledge about: (i) mathematical modeling of systems, (ii) transferring the mathematical model to a (parallel) program, (iii) visualization and interpretation of the experiment results, and (iv) performance analysis and improvements. The exercise exactly aims at bridging the gap between the individual tasks of a scientific workflow and equip students with wide knowledge.

关键词： Workflow for scientific computing Teaching parallel programming Performance analysis Heat transfer

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Supporting internet applications beyond browsing: Trigger processing and change notification (extended abstract) 5th

Supporting internet applications beyond browsing: Trigger pr...

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5th international Computer Science conference (ICSC 99)

作者： Liu, L Pu, C Tang, W Georgia Inst Technol Coll Comp Atlanta GA 30332 USA

ISBN: (纸本)3540669035

This paper presents the design and implementation methodology of the JCQ system, a Java-based Continual Query system for update monitoring over Web information sources. A continual query is a standing query that monitors updates of interest using distributed triggers and notifies users whenever the updates reach specified thresholds. In this paper we focus on the strategies and techniques developed in JCQ for scalable and efficient trigger firing and the execution model for flexible and robust change notification. We evaluate our approach through a performance study of the most recent release of the JCQ system and a comparison with related work.

关键词： Search engines

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Applied parallel and Scientific Computing - 10th international conference, PARA 2010, Revised Selected Papers

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10th international conference on Applied parallel and Scientific Computing, PARA 2010

ISBN: (纸本)9783642281440

The proceedings contain 77 papers. The topics discussed include: on aggressive early deflation in parallel variants of the QR algorithm;a model for efficient onboard actualization of an instrumental cyclogram for the mars MetNet mission on a public cloud infrastructure;distributed Java programs initial mapping based on extremal optimization;global asynchronous parallel program control for multicore processors;streaming model computation of the FDTD problem;numerical investigation of the cumulant expansion for Fourier path integrals;simulated annealing with coarse graining and distributed computing;high performance computing techniques for scaling image analysis workflows;parallel computation of bivariate polynomial resultants on graphics processing units;an interval version of the Crank-Nicolson method - the first approach;and an interval finite difference method of Crank-Nicolson type for solving the one-dimensional heat conduction equation with mixed boundary conditions.

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A Systematic Analysis of applications Of Blockchain in Healthcare 6

A Systematic Analysis of Applications Of Blockchain in Healt...

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6th IEEE international conference on Signal processing, Computing and Control, ISPCC 2021

作者： Agarwal, Ambuj Kumar Tiwari, Raj Gaurang Kaushal, Rajesh Kumar Kumar, Naveen Chitkara University Institute Of Engineering And Technology Chitkara University Punjab India

ISBN: (纸本)9781665425520

advent of the internet and its impact on healthcare domain made it possible to store, access and update medical records anywhere and anytime. The term 'Electronic Health Record(EHR)' refers to a digital format in which patient information is kept. Because the records are patient-centered, any authorised user can access them from any location, at any time, and from any device. Blockchain is a new technology, booming in most of the industries. Blockchain contains a number of built-in characteristics, including distributed ledger, decentralized storage, authenticity, confidentiality, and immutability and it has progressed actual applications in industries like healthcare. Blockchain achieves fortifying and averting the modification of electronic health records. Blockchain supports the quality of healthcare services to the benefits of both patients and hospitals. This paper investigates the existing techniques used in healthcare blockchain system in the domain of authentication, data integrity, and confidentiality. © 2021 IEEE.

关键词： Blockchain

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Applied parallel and Scientific Computing - 10th international conference, PARA 2010, Revised Selected Papers

Applied Parallel and Scientific Computing - 10th Internation...

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10th international conference on Applied parallel and Scientific Computing, PARA 2010

ISBN: (纸本)9783642281501

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