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25th International Conference on parallel processing, ICPP 1996

作者： So, J.J.E. Janardhan, R. Downar, T.J. Siegel, H.J. Parallel Processing Laboratory School of Electrical and Computer Engineering Purdue University West LafayetteIN47907-1285 United States School of Nuclear Engineering Purdue University West LafayetteIN47907-1290 United States

ISBN: (纸本)081867623X

This is a study of the performance on different parallel machines of the solution to the system of linear equations that results from the finite-differencing of the neutron diffusion equation in the context of nuclear reactor simulation. The solution approach uses the CG (conjugate gradient) and the PCG (preconditioned CG) methods. For PCG, a block preconditioner based on the incomplete Cholesky factorization was used. The issues involved in mapping the CG and the PCG algorithms onto the mixed-mode PASM prototype, the SIMD MasPar MP-1, and the MIMD Intel Paragon XPIS are discussed. On PASM, the mixed-mode implementation outperformed either SIMD or MIMD alone. Theoretical performance predictions were analyzed and compared with the experimental results on the MasPar MP-1 and the Paragon XPIS. Other issues addressed for all three machines include the impact on execution time of the number of processors used and the impact of the interprocessor communication network on performance. © 1996 IEEE.

关键词： Mapping

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Linear Degrees of Freedom for K-user MISO Interference Channels With Blind Interference Alignment

Linear Degrees of Freedom for K-user MISO Interference Chann...

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作者： Yang, Heecheol Shin, Wonjae Lee, Jungwoo Wireless Signal Processing Laboratory Department of Electrical and Computer Engineering Seoul National University Seoul08826 Korea Republic of

In this paper, we characterize the degrees of freedom (DoF) for K-user M × 1 multiple-input single-output interference channels with reconfigurable antennas, which have N-preset modes at the receivers, assuming linear coding strategies in the absence of channel state information at the transmitters, i.e., blind interference alignment. Our linear DoF converse builds on the lemma that if a set of transmit symbols is aligned at their common unintended receivers, those symbols must have independent signal subspace at their corresponding receivers. This lemma arises from the inherent feature that channel state's changing patterns of the links towards the same receiver are always identical, assuming that the coherence time of the channel is long enough. We derive an upper bound for the linear sum DoF, and propose an achievable scheme that exactly achieves the linear sum DoF upper bound when both of the n∗/M=R1 and MK/n∗=R2 are integers, where n∗ denotes the optimal number of preset modes out of N preset modes. For the other cases, where either R1 or R2 is not an integer, we only give some guidelines how the interfering signals are aligned at the receivers to achieve the upper bound. As an extension, we also show the linear sum DoF upper bound for downlink/uplink cellular networks. © 2017 IEEE.

关键词： Channel state information

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The seamless approach to reconciling communication and locality in distributed memory parallel systems

The seamless approach to reconciling communication and local...

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International Symposium on parallel processing

作者： S.A. Fineberg T.L. Casavant B.H. Pease Parallel PrFessin Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa IA USA Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa IA USA

With recent improvements in single CPU performance, several issues become more important in multiprocessor design. Two of these are interprocessor communication and locality. In parallel systems with fast CPUs, locality is vital to performance. However, traditional parallel programming models such as shared memory or message passing do not naturally lead to programs that exhibit locality. In the paper, the Seamless model for interprocessor communication is presented which is based on locality and that allows the programmer to explicitly manipulate a program's locality to optimize performance. Additionally, this model can support latency tolerance with proper hardware support. Extensions to the C programming language that support this model are also presented. Finally, a parallel program utilizing this model is provided to illustrate the paradigm.< >

关键词： Delay Central processing Unit Programming profession Memory management Message passing Concurrent computing Reduced instruction set computing Cache memory Cities and towns parallel programming

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Specification and identification of events for debugging and performance monitoring of distributed multiprocessor systems

Specification and identification of events for debugging and...

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International Conference on Distributed Computing Systems

作者： J.E. Lumpp T.L. Casavant H.J. Siegel D.C. Marinescu Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa IA USA Parallel Processing Laboratory School of Electrical Engineering Purdue University USA Parallel Processing Laboratory School of Electrical Engineering Purdue University West Lafayette IN USA Computer Science Department Purdue University West Lafayette IN USA

The design of a debugging and performance analysis system that includes a specification language for process-level events and hardware for nonintrusive identification of these events during the execution of parallel and distributed application for a nonshared memory system is presented. The design is based on a formal event/action model and a layered architecture model that have been previously presented. Background, related work, and specification, and identification of events are discussed.< >

关键词： Debugging computerized monitoring Programming profession Multiprocessing systems parallel processing Laboratories Condition monitoring Hardware Application software Data structures

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Simulation research of communication networks based on prim algorithm

Simulation research of communication networks based on prim ...

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International Forum on Information Technology and Applications

作者： Yang, Chenghui Ren, ChuanJun College of Electrical Engineering Northwest University for Nationalities Lanzhou 730030 China National Laboratory for Parallel and Distributed Processing College of Computer Science National University of Defense Technology Changsha 410073 China

ISBN: (纸本)9780769541150

In order to improve the efficiency of the communication networks, we used the Kruskal algorithm and the Prim algorithm through algorithm comparison and analysis methods of data structure. A dynamic framework for the communication network installed system is built. Moreover, according to the actual framework of the communication network specific issues, the module chooses the Minimum Cost Spanning Tree Prim algorithm ultimately. The assumptions process and outcomes simulation have proper analysis and certification by C language. Experimental results show that the Minimum Cost Spanning Tree of Prim algorithm on the installed system for communication networks dynamic planning process have the advantage of speed and effectively reduce the waste of resources, which not only can ensure efficiency but also can effectively improve communication networks installed cost. © 2010 IEEE.

关键词： Costs

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Mathematical transformation of Petri-nets for development of parallel/distributed programs

Mathematical transformation of Petri-nets for development of...

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IEEE Annual International computer Software and Applications Conference (COMPSAC)

作者： Y.E. Papelis T.L. Casavant Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa IA USA

A novel approach for visually specifying parallel/distributed software using extended Petri-nets (PNS) is investigated. The approach is demonstrated to be useful in the specification of decision-making activities that control distributed computing systems. PNs are employed because of their highly visual nature that can give insight into the nature of the controller of such a system and because of their well-known analytical properties. In order to increase the expressive power of PNs, the extension of transition enabling functions is used. The main focus is a set of automatic transformations derived to transform such an extended net into a basic PN. Then, well-known analytical methods can be used to investigate characteristic properties of the system and validate correct operation. A graphical programming tool (XPAT) has been built to automate the visual programming process as well as the transformations.< >

关键词： Testing parallel processing Control systems Software systems Power system modeling Laboratories Distributed control Distributed computing Petri nets Automatic control

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Use of PARADISE: a meta-tool for visualizing parallel systems

Use of PARADISE: a meta-tool for visualizing parallel system...

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International Symposium on parallel processing

作者： J.A. Kohl T.L. Casavant Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa IA USA

Addresses the problem of creating software tools for visualizing the dynamic behavior of parallel applications and systems. PARADISE (parallel Animated Debugging and Simulation Environment) approaches this problem by providing a meta-tool environment for generating custom visual analysis tools. PARADISE is a meta-tool because it is a tool which is utilized to create other tools. The authors focus on the user's view of the use of PARADISE for constructing tools which analyze the interaction between parallel systems and parallel applications. An example of its use, involving the PASM parallel processing System, is given.< >

关键词： Visualization Algorithm design and analysis Image analysis parallel processing Laboratories Cities and towns Animation Computational modeling Analytical models Concurrent computing

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A flexible runtime system for image processing in a distributed computational environment for an unmanned aerial vehicle

A flexible runtime system for image processing in a distribu...

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作者： Nordberg, Klas Doherty, Patrick Forssén, Per-Erik Wiklund, Johan Andersson, Per Computer Vision Laboratory Department of Electrical Engineering Linköping University Sweden Knowledge Processing Laboratory Department of Computer Science Linköping University Sweden Department of Computer Science Lund University Sweden

A runtime system for implementation of image processing operations is presented. It is designed for working in a flexible and distributed environment related to the software architecture of a newly developed UAV system. The software architecture can be characterized at a coarse scale as a layered system, with a deliberative layer at the top, a reactive layer in the middle, and a processing layer at the bottom. At a finer scale each of the three levels is decomposed into sets of modules which communicate using CORBA, allowing system development and deployment on the UAV to be made in a highly flexible way. Image processing takes place in a dedicated module located in the process layer, and is the main focus of the paper. This module has been designed as a runtime system for data flow graphs, allowing various processing operations to be created online and on demand by the higher levels of the system. The runtime system is implemented in Java, which allows development and deployment to be made on a wide range of hardware/software configurations. Optimizations for particular hardware platforms have been made using Java's native interface. © World Scientific Publishing Company.

关键词： Image processing

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Design of a system for software testing and debugging for multiprocessor avionics systems 15

Design of a system for software testing and debugging for mu...

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15th Annual International computer Software and Applications Conference, CMPSAC 1991

作者： Lumpp, James E. Shultz, Roger K. Casavant, Thomas L. Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa CityIA52242 United States Advanced Technology and Engineering Collins Commercial Avionics Rockwell International Corporation Cedar RapidsIA52498 United States

ISBN: (纸本)0818621524

The debugging and testing of commercial software constitutes a substantial portion of the development time and, by most estimates, over fifty percent of the overall cost of software development. For critical applications, such as avionics, complete testing is extremely important. However, as multiprocessor software solutions find their way into these critical applications as a means of increasing performance and reliability, the need for both debugging and testing tools increases dramatically. This paper focuses on the gathering of accurate run-time information providing support for both debugging and testing of embedded multi-processor systems by employing runtime identification of "simple events" and post-execution identification of "compound events." Additionally, we propose a novel way of combining specification based (black-box) system testing and automatic monitoring to substantially reduce the complexity, tedium, and cost of complete structural (white-box) testing. © 1991 IEEE.

关键词： Program debugging

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A zeroing neurodynamics‐based location method for nodes in underwater acoustic sensor network

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CAAI Transactions on Intelligence Technology 2023年第3期8卷 661-669页

作者： Shuqiao Wang Xiujuan Du Tiantai Deng College of Computer Qinghai Provincial Key Laboratory of loTQinghai Normal UniversityXiningChina The State Key Laboratory of Tibetan Intelligent Information Processing and Application XiningChina The Department of Electronics and Electrical Engineering The University of SheffieldSheffieldEnglandUnited Kingdom

Zeroing neurodynamics methodology,which dedicates to finding equilibrium points of equations,has been proven to be a powerful tool in the online solving of problems with considerable *** this paper,a method for underwater acoustic sensor network(UASN)localisation is proposed based on zeroing neurodynamics methodology to preferably locate moving underwater nodes.A zeroing neurodynamics model specifically designed for UASN localisation is constructed with rigorous theoretical analyses of its *** proposed zeroing neurodynamics model is compatible with some localisation algorithms,which can be utilised to eliminate error in non‐ideal situations,thus further improving its ***,the effectiveness and compatibility of the proposed zeroing neurodynamics model are substantiated by examples and computer simulations.

关键词： artificial neural network internet of things underwater acoustic sensor network

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