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检索条件"主题词=Parallel algorithms"

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Energy-aware compiler scheduling for VLIW embedded software

Energy-aware compiler scheduling for VLIW embedded software

引用

International Conference on parallel Processing Workshops (ICPPW)

作者： Minyi Guo Department of Computer Software University of Aizu Fukushima Japan

In most of compilers, the goal of traditional instruction scheduling algorithms is to improve performance in terms of execution time. This can be done by some well-known ways such as superblock scheduling, hyperblock scheduling, and treegion scheduling. These scheduling strategies focus mainly on increasing performance through increasing the amount of instruction-level parallelism in program code. However, in VLIW (very long instruction word) architectures, an instruction word consists of a variable number of individual instructions. Therefore the step power and peak power consumption vary significantly depending on the parallel schedule generated by compiler. Power variation reduction without losing execution speed is an important scheduling constraint for embedded VLIW architectures. In this talk, we introduce some power-aware scheduling strategies for VLIW processors. These scheduling methods include: i) low power scheduling for basic blocks with integer programming; ii) modulo and software pipelining for loops; iii) register allocation and cache reuse for power reduction. With these techniques, switch activities between instructions can be minimized so that power consumption can be reduced significantly.

关键词： Processor scheduling Program compilers Computer instructions parallel algorithms Integer programming Pipeline processing

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Possibilities to solve the clique problem by thread parallelism using task pools

Possibilities to solve the clique problem by thread parallel...

引用

International Symposium on parallel and Distributed Processing (IPDPS)

作者： H. Blaar T. Lange R. Winter M. Karnstedt Institute für Informatik Martin-Luther-Universität Halle-Wittenberg Halle Germany Fakultät für Informatik und Automatisierung Technische Universität Illmenau Ilmenau Germany

We construct parallel algorithms with implementations to solve the clique problem in practice and research their computing time compared with sequential algorithms. The parallel algorithms are implemented in Java usin... 详细信息

关键词： Yarn Polynomials parallel algorithms Concurrent computing parallel processing Turing machines NP-complete problem Phase change random access memory Java Processor scheduling

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Isomorphic generating of concept lattices

Isomorphic generating of concept lattices

引用

IEEE International Conference on Granular Computing (GRC)

作者： Xiajiong Shen Zongtian Liu Qing Zhang Yun Li Baisheng Shi Computer Engineering and Science College Shanghai University Shanghai China Computer and Information Engineering College Henan University Kaifeng Henan China

Formal concept analysis has been considered as a methodology in data mining. This paper suggests an idea that generates concept lattices in terms of isomorphic formal contexts in order to support data mining or knowledge discovery. Hereby, it sets up a distributed knowledge model, which declines the time complexity of algorithms for constructing concept lattices. The paper discusses the details of algorithms for isomorphic generating of concept lattices.

关键词： Lattices Data mining Algorithm design and analysis Mathematics Polynomials parallel algorithms Computational modeling Concurrent computing Software maintenance Interference

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A distributed mobile agent based Web search for adaptive meta search engines

A distributed mobile agent based Web search for adaptive met...

引用

ITI International Conference on Information and Communications Technology (ICICT)

作者： M. Koorangi K. Zamanifar Department of Computer Engineering Isfahan University of Technology Iran

In this paper, the problems of current Web search engines are analyzed, and the need for a new design is justified. Some ideas on how to improve current Web search engines are presented, and then an adaptive method for Web meta-search engines with a multi-agent specially the mobile agents is presented to make search engines work more efficiently. In the method, the cooperation between stationary and mobile agents is used to make more efficiency. The meta-search engine gives the user needed documents based on the multi-stage mechanism. The merge of the results obtained from the search engines in the network is done in parallel. Using a reduction parallel algorithm, the efficiency of this method is increased. Furthermore, a feedback mechanism gives the meta-search engine the user's suggestions about the found documents, which leads to a new query using a genetic algorithm. In the new search stage, more relevant documents are given to the user. The practical experiments were performed in Aglets programming environment. The results achieved from these experiments confirm the efficiency and adaptability of the method

关键词： Mobile agents Web search Metasearch Search engines Indexing Databases Crawlers Network servers Design engineering parallel algorithms

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A Real-time Hierarchical and Distributed Control Scheme for Reactive Power Optimization in Multi-area Power Systems

A Real-time Hierarchical and Distributed Control Scheme for ...

引用

IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Xingong Cheng Yong Zhang Lixia Cao Jiwen Li Tao Shen Sheng Zhang School of Control Science and Engineering Jinan University Jinan Shandong China Department of Information and Electrical Engineering Shandong Institute of architecture and Engineering Jinan Shandong China School of Electrical Engineering Shandong University Jinan Shandong China Jinan Daily Press Group Jinan Shandong China

This paper presents a hierarchical and distributed reactive power optimization and control scheme which is characterized by distributed and parallel optimization algorithm. There are 2 levels in the scheme; each contains a set of agents. Level 1 is composed by the local control agents (CA). Level 2 consists of the distributed and parallel optimization agents (OA). The purpose is to propose a real-time system. When constraint violations of reactive power or voltage occur, CA acts first so as to reduce the violations to the minimum. After OA receives data transmitted by CA, optimal reactive power flow computation is conducted at regular intervals. Considering that OA always responses slower to the local variable changes than CA, CA can eliminate or alleviate some bus violations quickly, and OA therefore requires less computation time than usual. To get a further speedup, special control strategies are introduced, in which OA takes all the variables as continuous variables, while CA deals with the discrete variables. The simulation results show the validity of the proposed scheme

关键词： Real time systems Distributed control Reactive power control Power system control Power systems Reactive power Dispatching Large-scale systems parallel algorithms Power system modeling

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Small congestion embedding of separable graphs into grids of the same size

Small congestion embedding of separable graphs into grids of...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： A. Matsubayashi Division of Electrical Engineering and Computer Science Kanazawa University Kanazawa Japan

In this paper we consider the problem of embedding a (guest) graph into a grid with the same number of nodes as those of the guest graph with minimum edge congestion. We show that a graph which has some efficient recursive separators can be embedded into a grid of the same size with small congestion. Our results imply that an N-node planar graph with maximum vertex degree /spl Delta/ can be embedded into an N-node grid with congestion O (/spl Delta//sup 2/ log N), and if the graph is a tree, then it can be embedded into an N-node grid with congestion O(/spl Delta/). The congestion for trees is optimal within a constant factor, and the congestion for planar graphs is optimal within an O(min{/spl Delta//sup 2/ /spl radic/log N, /spl Delta/ log N}) factor.

关键词： Tree graphs parallel algorithms Particle separators Very large scale integration Upper bound Computer science Message passing Computer networks Concurrent computing Embedded computing

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Video data mining: mining semantic patterns with temporal constraints from movies

Video data mining: mining semantic patterns with temporal co...

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IEEE International Symposium on Multimedia

作者： K. Shirahama K. Ideno K. Uehara Graduate School of Science and Technology Kobe University Nada Kobe Japan

For efficient video data management, 'video data mining' is required to discover 'semantic patterns' which are not only previously unknown and interesting, but also associated with semantically relevant events ('semantic events') in movies. In order to extract semantic patterns from a movie, we firstly represent it as a multi-stream of raw level metadata that abstracts the semantic information of the movie. Then, regarding to the temporal characteristic of the semantic event of the movie, we extract sequential patterns which are obtained by connecting temporally close and strongly associated symbols in the multi-stream of raw level metadata. We also propose a parallel data mining method in order to reduce the expensive computational cost. Finally, we verify whether the extracted patterns can be considered as semantic patterns or not.

关键词： Data mining Motion pictures Abstracts Joining processes Computational efficiency Technology management Frequency parallel algorithms Humans Raw materials

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Towards a more realistic BSP cost model

Towards a more realistic BSP cost model

引用

International Conference on High Performance Computing in the Asia-Pacific Region

作者： M. Kechid J.F. Myoupo Université de Picardie Jules-Verne Amiens France

In this paper, we present a refinement of the BSP (bulk synchronous parallel) cost model, in order to allow a more exact prediction of the parallel algorithms communication cost. Our approach is based on two point: (I) a deepening of the benchmarks to take into account all influential factors on the word sending cost in a communication; and (II) a more elaborate manner of prediction which carefully detects the communications course context of the algorithms to be predicted

关键词： Costs parallel algorithms Concurrent computing Predictive models Algorithm design and analysis parallel machines Computational modeling Phase change random access memory Physics computing Context

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Theory and practice of programming applied to membrane systems

Theory and practice of programming applied to membrane syste...

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International Symposium on Symbolic and Numeric algorithms for Scientific Computing (SYNASC)

作者： G. Ciobanu Research Institute e-Austria Timişoara Institute of Computer Science Romanian Academy Iasi Romania

Following the knowledge provided by the theory of programming, we present an abstract syntax of the membrane systems, and their semantics. We define an appropriate notion of configurations, and sets of inference rules corresponding to the three stages of an evolution step in membrane systems. A notion of bisimulation is defined; bisimulation relations allow to compare the evolution behaviour of two membrane systems. On the other hand, the practice of programming related to membrane systems is given by the presentation of some sequential and parallel software simulators, emphasizing their specific features.

关键词： Biomembranes Functional programming Skin Computer science parallel programming parallel algorithms Turing machines Registers parallel processing Concurrent computing

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Towards grid implementations of metaheuristics for hard combinatorial optimization problems

Towards grid implementations of metaheuristics for hard comb...

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International Symposium on Computer Architecture and High Performance Computing (SBAC-PAD)

作者： A.P.F. Araujo S. Urrutia C. Boeres V.E.F. Rebello C.C. Ribeiro Department of Computer Science Catholic University of Rio de Janeiro Rio de Janeiro Rio de Janeiro Brazil Instituto de Computação Universidade Federal Fluminense Niteroi Rio de Janeiro Brazil

Metaheuristics are approximate algorithms that are able to find very good solutions to hard combinatorial optimization problems. They do, however, offer a wide range of possibilities for implementations of effective robust parallel algorithms which run in much smaller computation times than their sequential counterparts. We present four slightly differing strategies for the parallelization of an extended GRASP with ILS heuristic for the mirrored traveling tournament problem. Computational results on widely used benchmark instances, using a varying number of processors, illustrate the effectiveness and the scalability of the different strategies. These low communication cost parallel heuristics not only find solutions faster, but also produce better quality solutions than the best known sequential algorithm.

关键词： Job shop scheduling Concurrent computing Costs Genetic algorithms Simulated annealing Ant colony optimization Computer science Robustness parallel algorithms Scalability

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