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检索条件"任意字段=Proceedings of the seventh workshop on Parallel and distributed simulation"

共 1359 条记录，以下是41-50 订阅

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Non-collective Scalable Global Network Based on Local Communications 9

Non-collective Scalable Global Network Based on Local Commun...

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9th IEEE/ACM workshop on Latest Advances in Scalable Algorithms for Large-Scale Systems (scalA)

作者： Berghoff, Marco Kondov, Ivan Karlsruhe Inst Technol Steinbuch Ctr Comp Karlsruhe Germany

ISBN: (纸本)9781728101767

To efficiently perform collective communications in current high-performance computing systems is a time-consuming task. With future exascale systems, this communication time will be increased further. However, global information is frequently required in various physical models. By exploiting domain knowledge of the model behaviors globally needed information can be distributed more efficiently, using only peer-to-peer communication which spread the information to all processes asynchronous during multiple communication steps. In this article, we introduce a multi-hop based Manhattan Street Network (MSN) for global information exchange and show the conditions under which a local neighbor exchange is sufficient for exchanging distributed information. Besides the MSN, in various models, global information is only needed in a spatially limited region inside the simulation domain. Therefore, a second network is introduced, the local exchange network, to exploit this spatial assumption. Both non-collective global exchange networks are implemented in the massively parallel NAStJA framework. Based on two models, a phase-field model for droplet simulations and the cellular Potts model for biological tissue simulations, we exemplary demonstrate the wide applicability of these networks. Scaling tests of the networks demonstrate a nearly ideal scaling behavior with an efficiency of over 90%. Theoretical prediction of the communication time on future exascale systems shows an enormous advantage of the presented exchange methods of O(1) by exploiting the domain knowledge.

关键词： peer-to-peer communication distributed memory scalable parallel algorithms massive-parallel performance network protocol stencil code phase-field method

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21st International workshop on Job Scheduling Strategies for parallel Processing, JSSPP 2017

21st International Workshop on Job Scheduling Strategies for...

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21st International workshop on Job Scheduling Strategies for parallel Processing, JSSPP 2017

ISBN: (纸本)9783319773971

The proceedings contain 10 papers. The special focus in this conference is on. The topics include: Analysis of Mixed Workloads from Shared Cloud Infrastructure;Tuning EASY-Backfilling Queues;don’t Hurry Be Happy: A Deadline-Based Backfilling Approach;Supporting Real-Time Jobs on the IBM Blue Gene/Q: simulation-Based Study;towards Efficient Resource Allocation for distributed Workflows Under Demand Uncertainties;programmable In Situ System for Iterative Workflows;A Data Structure for Planning Based Workload Management of Heterogeneous HPC Systems;ScSF: A Scheduling simulation Framework.

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Accelerating Octo-Tiger: Stellar Mergers on Intel Knights Landing with HPX 18

Accelerating Octo-Tiger: Stellar Mergers on Intel Knights La...

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International workshop on OpenCL (IWOCL)

作者： Pfander, David Daiss, Gregor Marcello, Dominic Kaiser, Hartmut Pflueger, Dirk Univ Stuttgart Stuttgart Germany Louisiana State Univ Baton Rouge LA 70803 USA

ISBN: (纸本)9781450364393

The optimization of performance of complex simulation codes with high computational demands, such as Octo-Tiger, is an ongoing challenge. Octo-Tiger is an astrophysics code simulating the evolution of star systems based on the fast multipole method using adaptive octrees as the central data structure. Octo-Tiger was implemented using high-level C++ libraries, specifically HPX and Vc, which allows its use on different hardware platforms. Recently, we have demonstrated excellent scalability in a distributed setting. In this paper, we study the node-level performance of Octo-Tiger on an Intel Knights Landing platform. We focus on Octo-Tiger's fast multipole method, as it is the computationally most demanding component. By using HPX and a futurization approach, we can efficiently traverse the adaptive octrees in parallel. On the core-level, threads process sub-grids using multiple 1074-element stencils. In numerical experiments, simulating the time evolution of a rotating star on an Intel Xeon Phi 7250 Knights Landing processor, Octo-Tiger shows good parallel efficiency. For the fast multipole algorithm, we achieved up to 408 GFLOPS, resulting in a speedup of 2x compared to a 24-core Skylake-SP platform, using the same high-level abstractions.

关键词： compute accelerators performance engineering parallel programming models high-level abstractions astrophysical simulations

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Full-wave simulation of the earthquake initiaion process 8

Full-wave simulation of the earthquake initiaion process

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Selected Papers of the 8th International Conference "distributed Computing and Grid-Technologies in Science and Education", GRID 2018

作者： Golubev, V.I. Golubeva, Yu.A. Moscow Institute of Physics and Technology 9 Institytsky Pereylok St. Dolgoprudny Moscow Region141700 Russia

The earthquake process leads to the destruction of building and has a significant influence on human life. Nowadays there is no methods to forecast it with the 100 % precision. Scientists around the world make efforts to invent numerical methods for simulation of the earthquake process. With the rapid development of high-performance computing systems more complex physical and mathematical models may be used. In this paper we describe the experience of full-wave seismic waves simulation in layered inhomogeneous medium The simple earthquake source model was used in 3D case. It allows us to reproduce the anisotropy of the registered seismic signal. The govern system of equations are solved numerically with the grid-characteristic method on structured meshes. To achieve a reasonable computation time, the parallel version of algorithms was applied. The spatial distribution of displacements on the sea surface was successfully simulated. © 2018 Vasily Golubev, Yulia Golubeva.

关键词： Earthquakes

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Properties of the parallel discrete event simulation algorithms on small-world communication networks 8

Properties of the parallel discrete event simulation algorit...

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Selected Papers of the 8th International Conference "distributed Computing and Grid-Technologies in Science and Education", GRID 2018

作者： Ziganurova, Liliia Shchur, Lev Science Center in Chernogolovka Chernogolovka Moscow Region142432 Russia National Research University Higher School of Economics Moscow101000 Russia Landau Institute for Theoretical Physics Chernogolovka Moscow Region142432 Russia

Synchronization aspects in the method of large-scale simulation, knovvn as parallel discrete event simulation (PDES), analyzed using the models of the time profile evolutions. Time profile is formed vvith the local virtual times of the processes. Time profile evolution in the simplest cases reminds the growth of the surface in the models of statistical physics. This simplest case considers only local dependences, the message exchange with the nearest neighbors. In the real simulations, the exchange can be with any of the processes, and we can consider the communication network of messages forms the small-world network. We found the enhancement of synchronization with the growing average shortest path of the small-world network. At the same time, the utilization drops down, although on the moderate level. We present the preliminary results of our study. The work is supported by grant 14-21-00158 of the Russian Science Foundation. © 2018 Liliia Ziganurova, Lev Shchur.

关键词： Synchronization

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Current workflow execution using job scheduling for the NICA experiments 8

Current workflow execution using job scheduling for the NICA...

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Selected Papers of the 8th International Conference "distributed Computing and Grid-Technologies in Science and Education", GRID 2018

作者： Gertsenberger, K.V. Rogachevsky, O.V. Laboratory of High Energy Physics Joint Institute for Nuclear Research 6 Joliot-Curie Dubna Moscow Region141980 Russia

Simulated and experimental data processing is an important issue in modern high-energy physics experiments. High interaction rate and particle multiplicity in addition to the long sequential processing time of million events are the main reasons to parallelize event processing on distributed computing systems for the NICA experiments. The paper presents one of the directions of distributed data processing: job scheduling for user task distribution on computing clusters. The software and hardware environments being used for the current workflow execution are briefly noted. The current MPD-Scheduler system developed to simplify parallel execution of user ROOT macros for simulation, reconstruction and data analysis is described in details. The practical values of the speedup for simulated event processing in the MPD experiment are shown. The possible workflow management systems being under discussion for the NICA experiments are also noted. © 2018 Konstantin V. Gertsenberger, Oleg V. Rogachevsky.

关键词： distributed computer systems

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Molecular dynamic simulation of water vapor interaction with various types of pores using hybrid computing structures 8

Molecular dynamic simulation of water vapor interaction with...

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Selected Papers of the 8th International Conference "distributed Computing and Grid-Technologies in Science and Education", GRID 2018

作者： Korenkov, V.V. Nikonov, E.G. Popovičová, M. Joint Institute for Nuclear Research Dubna Moscow Region141980 Russia University of Prešov Prešov080 01 Slovakia

Theoretical and experimental investigations of water vapor interaction with porous materials are very needful for various fields of science and technology. Mathematical modelling plays an important role in these investigations. Conventional approaches to solve problems of mathematical research of the processes of interaction of water vapor with individual pore are the so called micro and macro approaches. The first approach is based on the use of diffusion equation for description of interaction of water vapor with a pore. The second approach is based on various particle methods like Monte-Carlo simulations, molecular dynamics (MD) etc. In MD usage of efficient calculation methods is necessary because the degree of approximation for simulating system is largely determined by the dimensionality of the system of equations being solved at every time step. Number of time steps is also quite large. In this work, a study of efficiency of various implementations algorithms for MD simulation of water vapor interaction with individual pore is carried out. It is also investigated dependence of time required for simulations on different parameters, like number of particles in the system, shape of pores, and so on. The results of parallel calculations are compared with the results obtained by serial calculations. © 2018 Vladimir V. Korenkov, Eduard. G. Nikonov, Maria. Popovičová.

关键词： Porous materials

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NASA Technical Reports Server (Ntrs) 19990019831: Hpccp/Cas workshop proceedings 1998

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2017年

NASA Technical Reports Server (Ntrs) 19990019831: Hpccp/Cas workshop proceedings 1998 by NASA Technical Reports Server (Ntrs); published by

关键词： (ntrs) 19990019831: aerospace systems algorithms applications programs (computers) architecture (computers) computer aided design computer programming computer programs computer systems design computer systems performance computerized simulation conferences distributed memory distributed processing hpccp cas mata, ellen [editor] mathematical programming multidisciplinary design optimization multidisciplinary research nasa technical reports server (ntrs) parallel computers parallel processing (computers) parallel programming proceedings programming environments reports schulbach, catherine schulbach, catherine [editor]

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distributed and parallel version of the FDTD simulation algorithm

Distributed and parallel version of the FDTD simulation algo...

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2017 International Conference for Young Researchers in Informatics, Mathematics and Engineering, ICYRIME 2017

作者： Amenta, Giuseppe Sciuto, Grazia Lo Department of Electrical Electronic and Informatics Engineering University of Catania Catania Italy

This paper proposes an innovative algorithm for running in a distributed and parallel fashion the well-known Finite-Difference Time-Domain method. Given the dependence among data, for the proposed distributed version, care has been taken in the approach splitting the involved data. This is to avoid a great deal of data exchange among different hosts, so as to minimize the communication overhead. Performance comparisons between the proposed solution and the sequential one has shown that improvements can be achieved using the proposed version running on several hosts. Moreover, the distributed version let overcome the problem of central memory exhaustion, typical of this method, due to the large matrices to be handled. Copyright © 2017 held by the authors.

关键词： Finite difference time domain method

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CEUR workshop proceedings

CEUR Workshop Proceedings

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2017 workshop on Data, Modeling and Security, DMS 2017

The proceedings contain 16 papers. The topics discussed include: computer simulation of phase transition in antiferromagnetic systems with long-range effect;computer simulation of semi-infinite antiferromagnetics ising models critical behavior;the communities search on a pixels set of the image;image clustering by means of an artificial neural network;automatic method of the associative rules set analysis in a public organizations activities research;anomaly detection in event log of OS Windows;detection of plagiarism of the software source code using the mathematical metrics of complexity;the class of T-share inequalities for the service schedules of requirements by parallel devices polytope;the Blom's scheme modification for discretionary access control;realization of simplex channels in the distributed systems on the basis of the Blom's preliminary distribution of keys scheme;detection the stegoinsertions like LSB-substitution in bitmap images;robust algorithm of embedding of digital water marks in a video stream;role-based access control metamodel;local optimization of the role-based access control policy;analysis of formal concepts for combining user rights in computer systems;on the application of the access control policy to the threshold key exchange protocol based on the Blakley's scheme of secret sharing;and on the estimation of the damage from the leakage of permissions in a role-based security model.

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