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12th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2005

作者： Dimitrakopoulos, G. Nikolos, D.G. Vergos, H.T. Nikolos, D. Efstathiou, C. Technology and Computer Architecture Lab Computer Engineering and Informatics Dept. University of Patras 26500 Patras Greece Informatics Department ATEI of Athens 12210 Egaleo Athens Greece

ISBN: (纸本)9789972611001

Two architectures for parallel-prefix modulo 2n - 1 adders are presented in this paper. For large wordlengths we introduce the sparse modulo 2n - 1 adders that achieve significant reduction of the wiring complexity without imposing any delay penalty. Then, the Ling-carry formulation of modulo 2n - 1 addition is presented. Ling modulo adders save one logic level of implementation and provide high-speed solutions for smaller adder widths, where wiring complexity is small. The performance of the proposed adders has been validated with static CMOS implementations. In all examined cases, the proposed designs achieve significant savings in both area and delay compared to previously published architectures.

关键词： Adders

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Server consolidation for Internet applications in virtualized data centers

Server consolidation for Internet applications in virtualize...

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24th High Performance Computing Symposium, HPC 2016, Part of the 2016 Spring Simulation Multi-Conference, SpringSim 2016

作者： Wang, Bo Song, Ying Sun, Yuzhong Liu, Jun Department of Computer Science and Technology Xi'an Jiaotong University Xi'an710049 China SKL Computer Architecture ICT CAS Beijing100190 China SPKLSTN Lab Department of Computer Science and Technology Xi'an Jiaotong University Xi'an710049 China

ISBN: (纸本)9781510824256

Server consolidation based on virtualization technology simplifies system administration and improves energy efficiency by improving resource utilizations and reducing the physical machine (PM) number in contemporary service-oriented data centers. The elasticity of Internet applications changes the consolidation technologies from addressing virtual machines (VMs) to PMs mapping schemes which must know the VMs statuses, i.e. the number of VMs and the profiling data of each VM, into providing the application-to-VM-to-PM mapping. In this paper, we study on the consolidation of multiple Internet applications, minimizing the number of PMs with required performance. We first model the consolidation providing the application-to-VM-to-PM mapping to minimize the number of PMs as an integer linear programming problem, and then present a heuristic algorithm to solve the problem in polynomial time. Extensive experimental results show that our heuristic algorithm consumes less than 4.3% more resources than the optimal amounts with few overheads. Existing consolidation technologies using the input of the VM statuses output by our heuristic algorithm consume 1.06% more PMs. © 2016 Society for Modeling & Simulation International (SCS).

关键词： Elasticity

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Platform urbanism for resident safety: A real-time predictive microclimate risk monitoring and alert system

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Urban Climate 2025年 61卷

作者： Hossain, Sk Tahsin Yigitcanlar, Tan Nguyen, Kien Xu, Yue City 4.0 Lab QUT Urban AI Hub School of Architecture and Built Environment Queensland University of Technology 2 George Street Brisbane 4000 QLD Australia School of Electrical Engineering and Robotics Queensland University of Technology 2 George Street Brisbane 4000 QLD Australia School of Computer Science Queensland University of Technology 2 George Street Brisbane 4000 QLD Australia

Urban microclimates significantly impact public health, liveability, and emergency preparedness, yet traditional weather alert systems often rely on centralised data that fails to capture the spatial variability of conditions within cities. This study presents an innovative platform that integrates ArcGIS GeoEvent Server with AIoT-driven predictive analytics to deliver hyper-localised weather alerts. The platform's adaptable design enables the incorporation of location-specific AI/ML-based predictive models and context-aware notifications, tailored to at-risk populations based on their location, health conditions, and disabilities. Featuring three GeoEvent Services and two ArcGIS Notebook Schedules, the system facilitates real-time data ingestion, processing, predictive modelling, and dissemination. A case study in Brisbane, Australia, demonstrates its capacity to address microclimatic variability, revealing significant differences in thermal stress and precipitation patterns across suburbs. Unlike traditional city-wide alerts, the platform provides targeted notifications prioritising vulnerable groups such as children, elderly, and individuals with chronic conditions or disabilities. This approach enhances urban resilience and offers a scalable framework for applications in health monitoring, emergency response, and public safety. © 2024

关键词： Artificial-intelligence-of-things Brisbane Microclimate Platform urbanism Predictive risk monitoring Weather alert system

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A virtual-physical on-chip cache for shared memory multiprocessors

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3rd International Conference on Parallel Processing, Euro-Par 1997

作者： Kim, Dongwook Lee, Joonwon Computer Architecture Lab. Computer Science Department Korea Advanced Institute of Science and Technology 373-1 Kusung-dong Yusung-ku Taejon 305-701 Korea Republic of

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Embedded computer Systems: architectures, Modeling, and Simulation 1

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丛书名： Lecture Notes in computer Science

1000年

作者： Timo D. Hämäläinen Andy D. Pimentel Jarmo Takala Stamatis Vassiliadis

ISBN: (数字)9783540316640

ISBN: (纸本)9783540269694

The SAMOS workshop is an international gathering of highly quali?ed researchers from academia and industry, sharing in a 3-day lively discussion on the quiet and - spiring northern mountainside of the Mediterranean island of Samos. As a tradition, the workshop features workshop presentations in the morning, while after lunch all kinds of informal discussions and nut-cracking gatherings take place. The workshop is unique in the sense that not only solved research problems are presented and discussed but also (partly) unsolved problems and in-depth topical reviews can be unleashed in the sci- ti?c arena. Consequently, the workshop provides the participants with an environment where collaboration rather than competition is fostered. The earlier workshops, SAMOS I–IV (2001–2004), were composed only of invited presentations. Due to increasing expressions of interest in the workshop, the Program Committee of SAMOS V decided to open the workshop for all submissions. As a result the SAMOS workshop gained an immediate popularity; a total of 114 submitted papers were received for evaluation. The papers came from 24 countries and regions: Austria (1), Belgium (2), Brazil (5), Canada (4), China (12), Cyprus (2), Czech Republic (1), Finland (15), France (6), Germany (8), Greece (5), Hong Kong (2), India (2), Iran (1), Korea (24), The Netherlands (7), Pakistan (1), Poland (2), Spain (2), Sweden (2), T- wan (1), Turkey (2), UK (2), and USA (5). We are grateful to all of the authors who submitted papers to the workshop.

关键词： Theory of Computation computer Hardware Processor architectures computer Communication Networks System Performance and Evaluation computer System Implementation

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Simulation of hardware support for OpenGL graphics architecture 1

Simulation of hardware support for OpenGL graphics architect...

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1st International Conference on Information technology: Coding and Computing, ITCC 2000

作者： Paltashev, T. Govind, N. Abla, G. Department of Electrical and Computer Engineering SD School of Mines and Technology United States Intel Corporation Computing Enhancement Architecture Lab. United States

ISBN: (纸本)0769505406

The growing number of applications for 3D graphics and imaging systems in the mass market requires the customized approach to the design of high-performance 3D graphics and imaging system architectures. That fact coupled with the strong trends to industrial standardization of graphics API, such as OpenGL, leads to enhanced portability for imaging and graphics applications. The progress on the hardware support of API functionality gives a real possibility to use a top-down approach in the design of custom graphics/imaging systems based on the mixed hardware/software implementation of the OpenGL architecture. Software simulation is a relatively cheap and fast way for initial graphics architecture template development and evaluation to acquire the structure and parameters that can be used later for HDL elaboration and simulation. This paper discusses a 3D graphics and imaging system architecture model implementation based on OpenGL API hardware support simulation. The object-oriented approach has been used for this development of analytic and software models simulating hardware units on different stages of the graphics pipeline. The Interactive Imaging System architecture Composer has been developed in this project for fast run-time simulation management, data acquisition and interpretation. The expandable set of architecture templates uses a reconfigurable shared library of "virtual hardware units" simulating the different hardware structures for graphics and image processing. © 2000 IEEE.

关键词： Imaging systems

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An ant-based rule for UMDA's update strategy

An ant-based rule for UMDA's update strategy

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Lecture Notes in computer Science

作者： Fernandes, C.M. Lima, C.F. Laredo, J.L.J. Rosa, A.C. Merelo, J.J. Department of Computer's Architecture and Technology University of Granada Spain Portugal Informatics Lab. University of Algarve Gambelas Campus 8000-117 Faro Portugal

ISBN: (纸本)9783642213137

This paper investigates an update strategy for the Univariate Marginal Distribution Algorithm (UMDA) probabilistic model inspired by the equations of the Ant Colony Optimization (ACO) computational paradigm. By adapting ACO's transition probability equations to the univariate probabilistic model, it is possible to control the balance between exploration and exploitation by tuning a single parameter. It is expected that a proper balance can improve the scalability of the algorithm on hard problems with bounded difficulties and experiments conducted on such problems with increasing difficulty and size confirmed these assumptions. These are important results because the performance is improved without increasing the complexity of the model, which is known to have a considerable computational effort. © 2011 Springer-Verlag.

关键词： Ant colony optimization

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Structural health monitoring via dynamic visualization

Structural health monitoring via dynamic visualization

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2011 7th International Conference on Computational Intelligence and Security, CIS 2011

作者： Sun, Peng Guo, Xin College of Computer Science Northwestern Polytechnical University Xi'an China Lab. of Structural Engineering and Earthquake Resistance Xi'an University of Architecture and Technology Xi'an China

ISBN: (纸本)9780769545844

Visualization modeling based on DAQ (Data Acquisition) of SHM (Structural Health Monitoring) system helps nondestructive and Intelligent evaluation on structure. It makes up the shortage of traditional visual methods and speeds up mastering the state of structural health. It promotes the security of structure greatly. Using simulation data from the Key laboratory of Structural Engineering and Earthquake Resistance, the DynaTree method completes dynamic data visualization on SHM with OpenInventor toolkit. © 2011 IEEE.

关键词： Structural health monitoring

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Memory bandwidth optimization of SpMV on GPGPUs

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Frontiers of computer Science 2015年第3期9卷 431-441页

作者： Chenggang Clarence YAN Hui YU Weizhi XU Yingping ZHANG Bochuan CHEN Zhu TIAN Yuxuan WANG Jian YIN Key Lab of Intelligent Information Processing Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Institute of Microelectronics Tsinghua University Beijing 100084 China Automation Department Tsinghua University Beijing 100084 China State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China State Grid Information & Communication Company of Hunan EPC Changsha 410007 China Department of Computer Shandong University Weihai 250101 China

It is an important task to improve performance for sparse matrix vector multiplication （SpMV）, and it is a difficult task because of its irregular memory access. Gen- eral purpose GPU （GPGPU） provides high computing abil- ity and substantial bandwidth that cannot be fully exploited by SpMV due to its irregularity. In this paper, we propose two novel methods to optimize the memory bandwidth for SpMV on GPGPU. First, a new storage format is proposed to exploit memory bandwidth of GPU architecture more effi- ciently. The new storage format can ensure that there are as many non-zeros as possible in the format which is suitable to exploit the memory bandwidth of the GPU. Second, we pro- pose a cache blocking method to improve the performance of SpMV on GPU architecture. The sparse matrix is partitioned into sub-blocks that are stored in CSR format. With the block- ing method, the corresponding part of vector x can be reused in the GPU cache, so the time to access the global memory for vector x is reduced heavily. Experiments are carried out on three GPU platforms, GeForce 9800 GX2, GeForce GTX 480, and Tesla K40. Experimental results show that both new methods can efficiently improve the utilization of GPU mem- ory bandwidth and the performance of the GPU.

关键词： GPGPU performance tuning SpMV cacheblocking memory bandwidth

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Tighter Bounds of Speedup Factor of Partitioned EDF for Constrained-Deadline Sporadic Tasks 42

Tighter Bounds of Speedup Factor of Partitioned EDF for Cons...

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42nd IEEE Real-Time Systems Symposium, RTSS 2021

作者： Liu, Xingwu Chen, Zizhao Han, Xin Sun, Zhenyu Guo, Zhishan School of Mathematical Sciences Dalian University of Technology China SK-Lab of Media Convergence Production Technology and Systems Chinaso Inc School of Software Technology Dalian University of Technology China SK-Lab of Computer Architecture ICT CAS University of CAS Beijing China Department of Electrical and Computer Engineering University of Central Florida United States

ISBN: (纸本)9781665428026

Even though earliest-deadline-first (EDF) is optimal in terms of uniprocessor schedulability, it is co-NP-hard to precisely verify uniprocessor schedulability for constrained-deadline task sets. The most efficient way to solve this problem in polynomial time is via a partially linear approximation of the demand bound function. Such approximation leads to a simple uniprocessor schedulability testing with speedup factor ρ. Such a result further leads to Deadline-Monotonic Partitioned-EDF on multi-processors with speedup factor of 1 + ρ − 1/m (where m is the number of processors). The current state of the art results indicate that ρ is within the range [1.5, 14/9]. Especially, it has been a conjecture that ρ = 1.5. This paper improves the range of ρ to (1.5026, 1.5380). The improved lower bound disproves the conjecture of lower bound 1.5. A novel technique is to construct an auxiliary function that is larger than the approximate demand bound function but keeps the supremum ρ unchanged. It solves the dilemma that beating the lower bound 1.5 requires extremely large task sets, while the large size makes it difficult to check the schedulability. This technique not only enables us to disprove 1.5 by a task set of only eight tasks, but also sheds light on future work in transferring/downsizing task sets and deriving utilization bound based tests for various workload abstraction models, such as DAG tasks. ©2021 IEEE

关键词： Polynomial approximation

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