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检索条件"主题词=Data Flow Computing"

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Modification of the SSAPRE algorithm for semantic code motion

Modification of the SSAPRE algorithm for semantic code motio...

引用

International Forum on Strategic Technology, IFOST

作者： D. Gurchenkov Institute of Information Systems Russia

Code motion (CM) is a technique for program transformation aimed at removing program statements that are redundant due to recomputing previously produced values. Such transformations improve the program performance and decrease its size, so redundancy elimination is employed by all optimizing compilers. Most of the algorithms used in production compilers perform syntactic code motion [1] in the sense that they find and remove redundancy between lexically identical expressions. This paper presents an improvement over the well-known SSAPRE algorithm that was previously limited to syntactic code motion. The proposed modification increases the algorithm strength by capturing the redundancy carried through assignment statements, including code patterns that cannot be optimized by any existing CM technique. The presented algorithm can be thought of as semantic code motion.

关键词： data analysis Program processors Motion analysis Symbiosis Man machine systems Production Optimizing compilers Performance analysis Algorithm design and analysis data flow computing

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Applying array contraction to a sequence of DOALL loops

Applying array contraction to a sequence of DOALL loops

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International Conference on Parallel Processing (ICPP)

作者： Yonghong Song Zhiyuan Li Sun Microsystems Inc. Santa Clara CA USA Department of Computer Sciences Purdue University West Lafayette IN USA

ISBN: (纸本)0769521975

Efficient program execution on multiprocessor computers requires both sufficient parallelism and good data locality. Recent research found that, using a combination of loop shifting, loop fusion, and array contraction, one can reduce the memory required to execute a sequence of serial loops, thereby to improve the cache locality. This paper studies how to extend such a memory-reduction scheme to a sequence of DOALL loops, which are executed in parallel on multiprocessors. Two methods are proposed to overcome difficulties caused by loop-carried dependences. data copy-in is performed to remove anti-dependences between different parallel threads, and computation duplication is performed to remove flow dependences. Experiments performed on a number of benchmark programs show that the proposed technique improves both cache locality and parallel execution speed for the DOALL loops. The scheme achieves an average speedup of 1.41 for 17 programs on a 4-processor SUN machine.

关键词： Yarn Concurrent computing Sun Computer networks Parallel processing Intelligent networks data flow computing

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Design of an efficient variable-length FFT processor

Design of an efficient variable-length FFT processor

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Chung-Ping Hung Sau-Gee Chen Kun-Lung Chen Department of Electronics Engineering National Chiao-Tung University Hsinchu Taiwan ROC

ISBN: (纸本)078038251X

In this paper, we propose an efficient variable-length FFT processor architecture suitable for multi-mode and multi-standard OFDM communication systems. The FFT processor is based on radix-2/sup 2/ DIF FFT algorithm and also supports non-power-of-4 FFT computation. The design contains an efficient processing element (PE), which can execute radix-2/sup 2/ butterfly (BF) operations, as well as radix-2 BF operations. Moreover, in order to achieve high-performance variable-length FFT operations and data accesses, an efficient variable-length address generator and twiddle factor generator are designed. The design has the merits of low complexity and high speed performance. The designs consider seven different FFT lengths including 64, 256, 512, 1024, 2048, 4096, and 8192 points, which cover all the required FFT lengths by 802.11a, 802.16a, DAB, DVB-T, VDSL and ADSL.

关键词： Computer architecture OFDM Memory architecture Digital video broadcasting Real time systems Read only memory Fast Fourier transforms Throughput Hardware data flow computing

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Context-sensitivity matters, but context does not

Context-sensitivity matters, but context does not

引用

IEEE International Workshop on Source Code Analysis and Manipulation

作者： J. Krinke Fern Universität Hagen Hagen Germany

Whether context-sensitive program analysis is more effective than context-insensitive analysis is an ongoing discussion. There is evidence that context-sensitivity matters in complex analyses like pointer analysis or program slicing. One might think that the context itself matters, because empirical data shows that context-sensitive program slicing is more precise and under some circumstances even faster than context-insensitive program slicing. Based on some experiments, we will show that this is not the case. The experiment requires backward slices to return to call sites specified by an abstract call stack. Such call stacks can be seen as a poor man's dynamic slicing: for a concrete execution, the call stack is captured, and static slices are restricted to the captured stack. The experiment shows that there is no significant increase in precision of the restricted form of slicing compared to the unrestricted traditional slicing. The reason is that a large part of an average slice is due to called procedures

关键词： Reachability analysis Concrete data mining data flow computing Iterative methods data analysis Conferences

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Design of a neuro-fuzzy chip using adaptive multimode approaches for an intelligent car-backing system

Design of a neuro-fuzzy chip using adaptive multimode approa...

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： Shao-Hua Lee Jeen-Shing Wang School of Electrical and Computer Engineering National Cheng Kung University Tainan Taiwan

ISBN: (纸本)0780385675

This paper presents a new approach to design an adaptive multimode neuro fuzzy chip (AMNFC) with on-chip learning and highly efficient resource utilization capabilities for a car-backing system. The design process is performed by a high-level datapath synthesis that is based on an optimal scheduling and a resource allocation algorithm. A novel data flow graph (DFG) scheduling algorithm suitable for parallel structure computation has been developed for designing a neuro-fuzzy chip. The proposed algorithm fulfills two major objectives. First, it simultaneously optimizes both the schedule and allocation of functional units, registers, and multiplexers with respect to a minimal cost of the hardware resources and the total time of execution. Second, it implements an adaptive multimode neural-fuzzy system with reconfiguration capability. Computer simulations and experimental results have successfully validated the effectiveness of the proposed design approach for a car-backing system.

关键词： Intelligent systems Resource management Algorithm design and analysis Optimal scheduling Scheduling algorithm data flow computing Fuzzy systems System-on-a-chip Process design flow graphs

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Multi-DSP based intelligent vehicle vision system and software & hardware co-realization

Multi-DSP based intelligent vehicle vision system and softwa...

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World Congress on Intelligent Control and Automation (WCICA)

作者： Tie Liu Nanning Zheng Hong Cheng Zhengbei Xing Institute of Artificial Intelligence and Robotics Xi'an Jiaotong University Xi'an China

ISBN: (纸本)0780382730

Machine vision system is one of the most important components of intelligent vehicles, and the software and hardware co-realization is critical for the vision navigation of intelligent vehicles. This work presents the multi-DSP realization for intelligent vehicle vision system, analyzes and illustrates the software and hardware co-realization. Based on the software framework and the data flow of the machine vision system, we propose the software implementation for the host computer and DSP terminals. In particular, a road detection algorithm and its multi-DSP realization are presented. Simulated in real environments, the system is stable and its real-time performance is satisfactory.

关键词： Intelligent vehicles Machine vision Software systems Hardware Navigation Computer vision data flow computing Digital signal processing Roads Detection algorithms

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Visualization of program dependence and slices

Visualization of program dependence and slices

引用

International Conference on Software Maintenance (ICSM)

作者： J. Krinke FernUniversität Hagen Germany

The program dependence graph (PDG) itself and the computed slices within the program dependence graph are results that should be presented to the user in a comprehensible form, if not used in subsequent analyses. A graphical presentation would be preferred as it is usually more intuitive than textual ones. This work describes how a layout for the PDGs can be generated to enable an appealing presentation. However, experience shows that the graphical presentation is less helpful than expected and a textual presentation is superior. Therefore, this work contains an approach to textually present slices of PDGs in source code. The innovation of this approach is the fine-grained visualization of arbitrary node sets based on tokens and not on complete lines like in other approaches. Furthermore, a major obstacle in visualization and comprehension of slices is the loss of locality. Thus, this work presents a simple, yet effective, approach to limit the range of a slice. This approach enables a visualization of slices where the local effects stand out against the more global effects. A second, more sophisticated approach visualizes the influence range of chops for variables and procedures. This enables a visualization of the impact of procedures and variables on the complete system.

关键词： Visualization Layout Software maintenance Technological innovation Application software Software testing Area measurement Software measurement data flow computing Iterative methods

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System level asynchronous virtual pipeline on dynamically and partially reconfigurable architecture

System level asynchronous virtual pipeline on dynamically an...

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International Conference on Solid-State and Integrated Circuit Technology

作者： Min Li Xiaobo Wu Menglian Zhao Hui Wang Ping Li Institute of VLSI Design University of Zhejiang China

ISBN: (纸本)078038511X

Nowadays, dynamically and partially reconfigurable architectures (DPRA) have been widely adopted by backbone equipment manufacturers to tackle the market pressure in terms of cost, performance, time to market, etc. Among all the advantages of DPRA, the run time rapid reconfiguration is still not fully utilized to deliver the greatest potential. In our work, a system level asynchronous virtual pipeline (SLAVP) is studied on a block partitioned DPRA for throughput critical telecommunication applications. Unlike previous approaches, SLAVP does not constrain the computation of pipeline stages to be strictly balanced, and it does not constrain the input specification to be a sequential data flow graph. By swapping tasks in/out, more logic stages are implemented than the physically available resources, and this achieves greater efficiency on the DPRA. In addition, we proposed a method to transform the problem to a generic system level synthesis problem, and then developed a hierarchical genetic algorithm (GA) based tool for synthesis on a block partitioned DPRA.

关键词： Pipelines Reconfigurable architectures data flow computing Spine Manufacturing Costs Time to market Throughput Telecommunication computing flow graphs

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Agent-oriented software analysis

Agent-oriented software analysis

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Australian Conference on Software Engineering

作者： K. Chan L. Sterling S. Karunasekera University of Melbourne Australia

Agent-oriented software engineering (AOSE) has become an active area of research in recent years. We look at the use of agent-oriented concepts for software analysis. Using agent-oriented analysis may offer benefits even if the system is implemented without an agent-based language or framework (e.g. using an object-oriented detailed design and language). We examine the software analysis components of a number of existing agent-oriented methodologies. We discuss the benefits that can be gained by using agent-oriented concepts, and where the concepts require further development. Based on this analysis, we present the agent-oriented methodology that we are developing, and describe an example of how it may be applied for software analysis.

关键词： Object oriented modeling Software engineering Application software Programming Buildings Information analysis Humans data analysis Software systems data flow computing

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A new cache approach based on graph for Web servers

A new cache approach based on graph for Web servers

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Mexican International Conference on Computer Science (ENC)

作者： E. Edi D. Trystram J.M. Vincent Laboratoire Informatique et Distribution ID-IMAG Montbonnot Saint Martin France

This work deals with the problem of data cache for dynamic Web servers. A set of requests (which number could be large) is submitted to a server for computing. Every request is modelled by a series-parallel graph of elementary tasks. These tasks are computed and their results are submitted to be stored into a cache. Due to the limitation of the cache capacity, some strategies should be used to select the right ones. The aim of This work is to determine, in a static session, what tasks results have to be cached in order to reduce the computing time. The problem has been formalized using graphs representation whose complexity is briefly shown to be NP-hard. Then, heuristics are proposed to select the cached data. Finally some preliminary experimental results are discussed.

关键词： Web server Delay Personal communication networks Network servers Time factors data flow computing Ethernet networks Bandwidth Web and internet services Quality of service

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