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Novel adaptive subcarrier power and bit allocation using wavelet packet parallel architecture

引用

6th international conference on algorithms and architectures for parallel processing

作者： Ren, R Zhu, SH Xian Jiaotong Univ Sch Elect & Informat Engn Xian 710049 Peoples R China Xian Jiaotong Univ Dept Phys Xian 710049 Peoples R China

ISBN: (纸本)3540292357

To realize the requirement of next mobile communication, the adaptive allocation schema of power and bit is presented by using discrete wavelet packet transform (DWPT). the subcarrier modulation and rate allocation method is used for OFDM-DS/CDMA system. According to the downlink channel feedback bit error rate (BER) acquired from uplink channel, an optimal wavelet packet multicarrier modulation allocation is established. For the given BER and QoS, the transmitting power is minimum. the system realizes the high frequency spectrum efficiency. the result shows that the adaptive wavelet packet algorithm not only has the fast convergence rate, but also achieves minimum complexity. the allocation proposed has better performance compared with traditional OFDM system. It is valuable that the system can adaptively adjust the power and bit rate to achieve minimum total transmission power in high rate and efficiency.

关键词： parallel processing systems

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On some combinatorial properties of the star graph

On some combinatorial properties of the star graph

引用

international Symposium on parallel architectures, algorithms and Networks (ISPAN)

作者： N. Imani H. Sarbazi-Azad S.G. Akl IPM School of Computer Science Tehran Iran Department of Computer Engineering Sharif University of Technology Tehran Iran School of Computing Queen's University Kingston ONT Canada

the star graph, as an interesting network topology, has been extensively studied in the past. In this paper, we address some of the combinatorial properties of the star graph. In particular, we consider the problem of calculating the surface area of the star graph, answering an open problem previously posed in (K. Qiu et al., 1995).

关键词： Network topology Hypercubes Algorithm design and analysis Computer science Multiprocessor interconnection networks parallel processing Routing Genetic expression Computational complexity Very large scale integration

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A practical comparison of cluster operating systems implementing sequential and transactional consistency 1

引用

6th international conference on algorithms and architectures for parallel processing

作者： Frenz, S Lottiaux, R Schoettner, M Morin, C Goeckelmann, R Schulthess, P Univ Ulm D-89069 Ulm Germany INRIA IRISA F-35042 Rennes France

ISBN: (数字)9783540320715

ISBN: (纸本)3540292357

Shared Memory is an interesting communication paradigm for SMP machines and clusters. Weak consistency models have been proposed to improve efficiency of shared memory applications. In a programming environment offering weak consistency it is a necessity to worry about individual load and store operations and about proper synchronization. In contrast to this explicit style of distributed programming hared memory systems implementing strong consistency models are easy to program and consistency is implicit. In this paper we compare two representatives: Kerrighed and Plurix implementing sequential and transactional consistency respectively. Kerrighed is a single system image operating system (OS) based on Linux whereas Plurix is a native OS for PC clusters designed for shared memory operation. the measurements presented in this paper show that strong consistency models implemented at the OS level are competitive.

关键词： parallel processing systems

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Dynamic scheduling of nested loops with uniform dependencies in heterogeneous networks of workstations

Dynamic scheduling of nested loops with uniform dependencies...

引用

international Symposium on parallel architectures, algorithms and Networks (ISPAN)

作者： I. Riakiotakis P. Tsanakas Department of Electrical and Computer Engineering National and Technical University of Athens Athens Greece

Static algorithms have been proposed to parallelize loops with uniform dependencies for networks of workstations. However, the heterogeneous and dynamic nature of these networks demands a dynamic solution to the scheduling and load balancing problem. At the same time many dynamic scheduling algorithms have been proposed, but all of them are dealing with programs with parallel loops, i.e. loops without dependencies. In this paper we extend the applicability of dynamic algorithms by presenting a dynamic scheduling algorithm that uses simple data structures in order to handle programs with data dependencies. Experimental results validate the proposed algorithm in both homogeneous and heterogeneous networks.

关键词： Dynamic scheduling Intelligent networks Processor scheduling Heuristic algorithms Scheduling algorithm Workstations Concurrent computing Load management Computer networks parallel processing

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the use of vertical processing principle in parallel image processing on conventional MIMD computers

The use of vertical processing principle in parallel image p...

引用

8th international conference on parallel Computing Technologies, PaCT 2005

作者： Rusin, Evgeny V. Institute of Computational Mathematics and Mathematical Geophysics Siberian Branch Russian Academy of Sciences 6 Acad. Lavrentiev Ave Novosibirsk 630090 Russia

PLVIP, experimental library for parallel image processing, designed and implemented in the Image processing Laboratory of the Institute of Computational Mathematics and Mathematical Geophysics SB RAS, is described. the library is built on the principle of vertical processing and is installed on two multiprocessor computers of the Siberian Supercomputer Center, the 32-processor Linux cluster MVS-1000/M and the 8-processor SMP server RM600-E30. Basic characteristics of the library (supported data formats, organization of computational process, and implemented subprograms) and an example of its application are considered. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Image processing

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Fragmentation-efficient node allocation algorithm in 2D mesh-connected systems

Fragmentation-efficient node allocation algorithm in 2D mesh...

引用

international Symposium on parallel architectures, algorithms and Networks (ISPAN)

作者： Kyung-Hee Seo Department of Computer Science Sungshin Women's University Seoul South Korea

Efficient utilization of processing resources in a multicomputer system depends on the fast allocation algorithms that minimize system fragmentation. A small number of jobs with large submesh allocation requirements may significantly increase external fragmentation and the queuing delay of the rest of jobs. Under such circumstances, the proposed strategy further tries to allocate L-shaped submeshes instead of signaling the allocation failure. A simple and effective algorithm to find the allocatable L-shaped submeshes is proposed, that is shown to reduce the average turnaround time by minimizing the queuing delay, even though jobs are scheduled in an FCFS to preserve fairness. the extensive simulations show that the strategy performs more efficiently in terms of the task turnaround time and the system utilization.

关键词： Resource management Computer science Scheduling algorithm Delay effects Processor scheduling Interference System performance Shape Signal resolution parallel architectures

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OpenTS: An outline of dynamic parallelization approach

引用

8th international conference on parallel Computing Technologies (PaCT 2005)

作者： Abramov, S Adamovich, A Inyukhin, A Moskovsky, A Roganov, V Shevchuk, E Shevchuk, Y Vodomerov, A Russian Acad Sci Program Syst Inst Pereslavl Zalesskii 152020 Yaroslavl Reg Russia MSU Inst Mech Moscow 119192 Russia

ISBN: (纸本)3540281266

the paper is dedicated to an open T-system (OpenTS) - a programming system that supports automatic parallelization of computations for high-performance and distributed applications. In this paper, we describe the system architecture and input programming language as well as system's distinctive features. the paper focuses on the achievements of the last two years of development, including support of distributed, meta-cluster computations.

关键词： parallel processing systems

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Process scheduling for the parallel desktop

Process scheduling for the parallel desktop

引用

international Symposium on parallel architectures, algorithms and Networks (ISPAN)

作者： E. Frachtenberg Modeling Algorithms and Informatics Group (CCS-3) Computer and Computational Sciences Division Los Alamos National Laboratory USA

Commodity hardware and software are growing increasingly more complex, with advances such as chip heterogeneity and specialization, deeper memory hierarchies, fine-grained power management, and most importantly, chip parallelism. Similarly, workloads are growing more concurrent and diverse. With this new complexity in hardware and software, process scheduling in the operating system (OS) becomes more challenging. Nevertheless, most commodity OS schedulers are based on design principles that are 30 years old. this disparity may soon lead to significant performance degradation. Most significantly, parallel architectures such as multicore chips require more than scalable OSs: parallel programs require parallel-aware scheduling. this paper posits that imminent changes in hardware and software warrant reevaluating the scheduler's policies in the commodity OS. We discuss and demonstrate the main issues that the emerging parallel desktops are raising for the OS scheduler. We propose that a new approach to scheduling is required, applying and generalizing lessons from different domain-specific scheduling algorithms, and in particular, parallel job scheduling. Future architectures can also assist the OS by providing better information on process scheduling requirements.

关键词： Hardware Memory management Energy management Power system management Operating systems Degradation parallel architectures Multicore processing Scheduling algorithm

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A parallel computational code for the eduction of coherent structures of turbulence in fluid dynamics

引用

8th international conference on parallel Computing Technologies (PaCT 2005)

作者： Alfonsi, G Primavera, L Univ Calabria Dipartimento Difesa Suolo I-87036 Arcavacata Di Rende Italy Univ Calabria Dipartimento Fis I-87036 Arcavacata Di Rende Italy

ISBN: (纸本)3540281266

A parallel computational code is developed for the execution of the Proper Orthogonal Decomposition (POD) of turbulent flow fields in fluid dynamics, the POD is an analytically-founded statistical technique that permits the eduction of appropriately-defined modes of the flow from the background flow, allowing the determination of the coherent structures of turbulence. the computational aspects of the different phases of the computing procedure are analyzed and the development of the related parallel computational code is described. Computational tests corresponding to different computing domains and number of processors are executed on a HP-V2500 parallel computing system and the results are shown in terms of parallel performance of the different phases of the calculations separately considered and of the computational code in the whole.

关键词： parallel processing systems

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Coherence maintenances to realize an efficient parallel processing for a cache memory with synchronization on a chip-multiprocessor

Coherence maintenances to realize an efficient parallel proc...

引用

international Symposium on parallel architectures, algorithms and Networks (ISPAN)

作者： A. Yamawaki M. Iwane Kyushu Institute of Technology Kitakyushu Japan

A chip-multiprocessor is one of the promising architectures that can overcome the ILP limitation, high power consumption and high heating that current processors face. On a shared memory multiprocessor, a performance improvement relies on an efficient communication and synchronization method via shared variables. the TSVM cache combines communication and synchronization with the coherence maintenance on a chip-multiprocessor. that is, the communication and synchronization via shared variables are realized by one coherence transaction through a high-speed on chip inter-connection. the TSVM cache provides several instructions that each instruction has the individual coherence maintenance scheme. the combinations of these instructions can realize the producer-consumers synchronization, mutual exclusion and barrier synchronization with communication easily and systematically. this paper describes how those instructions construct three primitives and shows effect of these primitives using a clock cycle-accurate simulator written in VHDL. the result shows that the TSVM cache can improve a performance of 9.8 times compared with a traditional cache memory, and improve a performance of 2 times compared with a conventional cache memory with synchronization mechanism.

关键词： parallel processing Cache memory Frequency synchronization Clocks Energy consumption Delay Wire Embedded system Costs Cogeneration

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