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Exploiting Locality in Single Assignment Data Structures Updated Through Split-Phase Transactions

Cluster Computing 2001年第4期4卷 281-293页

作者： Amaral, José Nelson Lin, Wen-Yen Gaudiot, Jean-Luc Gao, Guang R. Department of Computing Science University of Alberta Edmonton Canada Tia Mobile Inc. Pasadena USA Department of Electrical Engineering University of Southern California Los Angeles USA Computer Architecture and Parallel Systems Laboratory Department of Electrical and Computer Engineering University of Delaware Newark USA

We present the design, implementation, and evaluation of single assignment data structures and of a software controlled cache in an existing multi-threaded architecture platform – the Efficient architecture for Running Threads (EARTH). The I-Structure Software-Controlled Cache (ISSC) exploits temporal and spatial locality of EARTH split-phased memory transactions for single-assignment memory references. Our experimental evaluation indicates that the caching mechanism for single-assignment storage makes the EARTH memory system more robust to variations in the latency of memory operations. As a consequence the system can be ported to a wider range of machine platforms and deliver speedup for both regular and irregular application.

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Adaptive Cache Memories for SMT Processors

Adaptive Cache Memories for SMT Processors

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Euromicro Symposium on Digital System Design

作者： Sonia Lopez Oscar Garnica David H. Albonesi Steven Dropsho Juan Lanchares Jose I. Hidalgo Department of Computer Engineering Rochester Institute of Technology Rochester NY USA Department of Computer Architecture Universidad Complutense de Madrid Madrid Spain Computer Systems Laboratory Cornell University Ithaca NY USA Google Inc. Zurich Switzerland

Resizable caches can trade-off capacity for access speed to dynamically match the needs of the workload. In Simultaneous Multi-Threaded (SMT) cores, the caching needs can vary greatly across the number of threads and their characteristics, offering opportunities to dynamically adjust cache resources to the workload. In this paper we propose the use of resizable caches in order to improve the performance of SMT cores, and introduce a new control algorithm that provides good results independent of the number of running threads. In workloads with a single thread, the resizable cache control algorithm should optimize for cache miss behavior because misses typically form the critical path. In contrast, with several independent threads running, we show that optimizing for cache hit behavior has more impact, since large SMT workloads have other threads to run during a cache miss. Moreover, we demonstrate that these seemingly diametrically opposed policies can be simultaneously satisfied by using the harmonic mean of the per-thread speedups as the metric to evaluate the system performance, and to smoothly and naturally adjust to the degree of multithreading.

关键词： Instruction sets Frequency domain analysis Delay Synchronization Algorithm design and analysis Adaptation model

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A parallel architecture for Ray-Tracing

A parallel architecture for Ray-Tracing

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IEEE Latin American Symposium on Circuits and systems (LASCAS)

作者： Alexandre S. Nery Nadia Nedjah Felipe M.G. França LAM - Computer Architecture and Microeletronics Laboratory Systems Engineering and Computer Science Program COPPE Universidade Federal do Rio de Janeiro Department of Electronics Engineering and Telecommunications Universidade do Estado do Rio de Janeiro

Real time rendering of three-dimensional scenes in high photorealistic detail is a hard task, such as in the Ray Tracing rendering algorithm. However, parallel implementations of Ray Tracing have been enabling real time performance, as the algorithm is embarrassingly parallel. Thus, a custom parallel design in hardware is likely to achieve an acceptable performance. In this paper, we propose a hardware parallel architecture capable of dealing with the main desirable features of Ray Tracing, such as shadows and reflection effects, imposing low area cost and acceptable rendering performance.

关键词： computer architecture Interrupters computers Light sources Process control Real-time systems Telecommunications

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Delay-bounded Sink Mobility in Wireless Sensor Networks

Delay-bounded Sink Mobility in Wireless Sensor Networks

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IEEE International Conference on Communications

作者： Yu Gu Yusheng Ji Jie Li Biao Han Baohua Zhao Information Systems Architecture Science Research Division National Institute of Informatics Department of Computer Science University of Tsukuba Tsukuba Science City State Key Laboratory of Networking and Switching Technology

ISBN: (纸本)9781457720529

This paper exploits sink mobility to prolong the network lifetime in wireless sensor networks (WSNs) where the information delay caused by moving the sink should be bounded. We build a unified framework for analyzing this joint sink mobility and routing problem. We offer a mathematical modeling that is general and captures diversified issues, e.g. sink mobility, routing, delay, etc. We discuss the induced subproblems and present efficient solutions for them. Then, we generalize these solutions and propose a polynomial-time optimal algorithm for the origin problem. In simulations, we show the benefits of involving a mobile sink. We also show that the impact of the delay bound on the network lifetime.

关键词： Sinks Wireless sensor networks Routing Problem mobility mathematical modeling

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Exploring Spatial-Temporal Multi-Frequency Analysis for High-Fidelity and Temporal-Consistency Video Prediction

Exploring Spatial-Temporal Multi-Frequency Analysis for High...

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Conference on computer Vision and Pattern Recognition (CVPR)

作者： Beibei Jin Yu Hu Qiankun Tang Jingyu Niu Zhiping Shi Yinhe Han Xiaowei Li Research Center for Intelligent Computing Systems State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences University of Chinese Academy of Sciences Capital Normal University

ISBN: (数字)9781728171685

ISBN: (纸本)9781728171692

Video prediction is a pixel-wise dense prediction task to infer future frames based on past frames. Missing appearance details and motion blur are still two major problems for current models, leading to image distortion and temporal inconsistency. We point out the necessity of exploring multi-frequency analysis to deal with the two problems. Inspired by the frequency band decomposition characteristic of Human Vision System (HVS), we propose a video prediction network based on multi-level wavelet analysis to uniformly deal with spatial and temporal information. Specifically, multi-level spatial discrete wavelet transform decomposes each video frame into anisotropic sub-bands with multiple frequencies, helping to enrich structural information and reserve fine details. On the other hand, multilevel temporal discrete wavelet transform which operates on time axis decomposes the frame sequence into sub-band groups of different frequencies to accurately capture multifrequency motions under a fixed frame rate. Extensive experiments on diverse datasets demonstrate that our model shows significant improvements on fidelity and temporal consistency over the state-of-the-art works. Source code and videos are available at https://***/Bei-Jin/STMFANet.

关键词： Discrete wavelet transforms Predictive models Wavelet analysis Streaming media Time-frequency analysis

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Exploring spatial-temporal multi-frequency analysis for high-fidelity and temporal-consistency video prediction

arXiv

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arXiv 2020年

作者： Jin, Beibei Hu, Yu Tang, Qiankun Niu, Jingyu Shi, Zhiping Han, Yinhe Li, Xiaowei Research Center for Intelligent Computing Systems State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences University of Chinese Academy of Sciences Capital Normal University

Video prediction is a pixel-wise dense prediction task to infer future frames based on past frames. Missing appearance details and motion blur are still two major problems for current predictive models, which lead to image distortion and temporal inconsistency. In this paper, we point out the necessity of exploring multi-frequency analysis to deal with the two problems. Inspired by the frequency band decomposition characteristic of Human Vision System (HVS), we propose a video prediction network based on multi-level wavelet analysis to deal with spatial and temporal information in a unified manner. Specifically, multi-level spatial discrete wavelet transform decomposes each video frame into anisotropic sub-bands with multiple frequencies, helping to enrich structural information and reserve fine details. On the other hand, multi-level temporal discrete wavelet transform which operates on time axis decomposes the frame sequence into sub-band groups of different frequencies to accurately capture multi-frequency motions under fixed frame rate. Extensive experiments on diverse datasets demonstrate that our model shows significant improvements on fidelity and temporal consistency over the state-of-the-art works. Copyright © 2020, The Authors. All rights reserved.

关键词： Discrete wavelet transforms

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Scheduling of dataflow models within the Reconfigurable Video Coding framework

Scheduling of dataflow models within the Reconfigurable Vide...

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IEEE Workshop on Signal Processing systems (SIPS)

作者： Jani Boutellier Veeranjaneyulu Sadhanala Christophe Lucarz Philip Brisk Marco Mattavelli Machine Vision Group University of Oulu Finland Department of Computer Science and Engineering IIT Bombay India Microelectronic Systems Laboratory Switzerland Processor Architecture Laboratory École Polytechnique Fédérale de Lausanne Switzerland

The upcoming reconfigurable video coding (RVC) standard from MPEG (ISO/IEC SC29WG11) defines a library of coding tools to specify existing or new compressed video formats and decoders. The coding tool library has been written in a dataflow/actor-oriented language named CAL. Each coding tool can be represented with an extended finite state machine and the dependencies between the tools are described as dataflow graphs. This paper proposes an approach to derive a multiprocessor execution schedule for RVC systems that are comprised of CAL actors. In addition to proposing a scheduling approach for RVC, an extension to the well-known permutation flow shop scheduling problem that enables rapid run-time scheduling of RVC tasks is introduced.

关键词： Video coding Job shop scheduling IEC standards ISO standards Libraries Transform coding Video compression Decoding Automata Runtime

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Analysis and Design of Mobile Model for DTN

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Chinese Journal of Electronics 2023年第4期18卷 635-638页

作者： Zhiting Lin Yugui Qu Yusheng Ji Baohua Zhao Department of Computer Science University of Science and Technology of China Hefei China Province Key Laboratory of Software in Computing and Communication Hefei China Information Systems Architecture Science Research Division National Institute of Informatics Tokyo Japan

Delay tolerant networks may become unexpectedly partitioned due to node mobility or variation in signal strength. However, most widely used models in some relative works are generally very simplistic. In order to exploit intelligent forwarding algorithms, a novel nodal mobile model of delay tolerant networks is presented to map reality with more accuracy. And several approaches are introduced to analyze the network structure, such as n-cliques, n-clans, degree, closeness and betweenness. Our research results showed that the centralizations became smaller when the wireless connections were concerned. It meant that quite a number of nodes became potential relays because of the new structure of networks.

关键词： Wireless communication Analytical models Wireless sensor networks Protocols Social networking (online) Sensitivity analysis Social network theory

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Explaining how intelligent control has improved the way we live: A survey on the use of Fuzzy Logic Controllers in daily human life

Explaining how intelligent control has improved the way we l...

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IEEE International Conference on Multimedia Computing and systems (ICMCS)

作者： R. Lasri I. Rojas H. Pomares Z. Sadouq Department of Computer Architecture and Computer Technology E.T.S.Ing. Informática & Telecomunicación University of Granada Spain Information and Telecommunication Systems Laboratory LASIT Faculty of Science Abdelmalek Essaadi University Tetuan Morocco

This paper focuses on the extensive use of Fuzzy Logic Controllers (FLCS) in various human applications, showing the great contribution added to intelligent control. Overall, this survey covers a broad selection of examples that demonstrates the improvements in control processes and the important role played by Fuzzy Logic Controllers (FLCS) in various fields of human life.

关键词： Fuzzy logic Humans Control systems Intelligent control Process control Heart Anesthesia

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Failure handling in a reliable multicast protocol for improving buffer utilization and accommodating heterogeneous receivers

Failure handling in a reliable multicast protocol for improv...

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Pacific Rim International Symposium on Dependable Computing

作者： Gunjan Khanna Saurabh Bagchi J. Rogers Dependable Computing Systems Laboratory School of Electrical & Computer Engineering Purdue University West Lafayette IN USA Architecture Standards & Security EngineeringInformation Security Bank of America Corporation Charlotte NC USA

Reliable multicast protocols are an important class of protocols for reliably disseminating information from a sender to multiple receivers in the face of node and link failures. A tree-based reliable multicast protocol (TRAM) provides scalable reliable multicast by grouping receivers in hierarchical repair groups and using a selective acknowledgment mechanism. We present an improvement to TRAM to minimize the resource utilization at intermediate hosts and to localize the effect of slow or malicious receivers on normal receivers. We present an evaluation of TRAM and TRAM++ on a campus-wide WAN without errors and with message errors. The evaluation brings out that, given a constraint on the buffer availability at intermediate hosts, TRAM++ can tolerate the constraint at the expense of increasing the end-to-end latency for the normal receivers by only 3.2% compared to TRAM in error-free cases. When slow or faulty receivers are present, TRAM++ is able to provide the same uninterrupted quality of service to the normal nodes while localizing the effect of the faulty ones without incurring any additional memory overhead.

关键词： Multicast protocols Delay Resource management Wide area networks Information security Streaming media Measurement Buffer storage Reliability engineering computer architecture

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