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Predictability of Web-server traffic congestion

Predictability of Web-server traffic congestion

引用

international workshop on Web Content Caching and Distribution, WCW

作者： Y. Baryshnikov E. Coffman G. Pierre D. Rubenstein M. Squillante T. Yimwadsana Bell Laboratories Lucent Technologies Inc. Murray Hill NJ USA Department of Electrical Engineering Columbia University New York NY USA Department of Computer Science Vrije Universiteit Amsterdam Netherlands T.J. Watson Research Center IBM Yorktown Heights NY USA

Large swings in the demand for content are commonplace within the Internet. When a traffic hotspot happens, however, there is a delay before measures such as heavy replication of content can be applied. this paper investigates the potential for predicting hotspots sufficiently far, albeit shortly, in advance, so that preventive action can be taken before the hotpot takes place. Performing accurate load predictions appears to be a daunting challenge at first glance, but this paper shows that, when applied to Web-server page-request traffic, even elementary prediction techniques can have a surprising forecasting power. We first argue this predictability from principles, and then confirm it by the analysis of empirical data, which reveals that large server overloads can often be seen well in advance. this allows steps to be taken to reduce substantially the degradation of service quality.

关键词： Telecommunication traffic Costs Internet Prediction algorithms Network servers Web server Computer science Delay Load forecasting data analysis

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An improved algorithm for locality-sensitive hashing

An improved algorithm for locality-sensitive hashing

引用

international Conference on Computer Science & Education (ICCSE)

作者： Wei Cen Kehua Miao School of Information Science and Engineering Xiamen University Xiamen China

ISBN: (纸本)9781479966011

We present an improved Locality-Sensitive Hashing for similarity search under high dimension search. Our scheme improves the running time based on the earlier algorithm Locality-Sensitive Hashing for hamming distance and euclidean distance. In this paper we have collected a database of the MNIST dataBASE, we proposed nearest neighbor search in the database and can get a good result in an acceptable time. the experimental results show that our data structure is up to about 10 times faster than ordinary Locality-Sensitive Hashing when working on a database of 60000 samples. At the same time, the accuracy rate and recall rate are higher than earlier algorithms.

关键词： Hamming distance Accuracy Euclidean distance Nearest neighbor searches Indexes data structures

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Mariposa: a new architecture for distributed data

Mariposa: a new architecture for distributed data

引用

international Conference on data Engineering

作者： M. Stonebraker P.M. Aoki R. Devine W. Litwin M. Olson Div. of Comput. Sci. California Univ. Berkeley CA USA Computer Science Div. Department of EECS University of California Berkeley CA USA

We describe the design of Mariposa, an experimental distributed data management system that provides high performance in an environment of high data mobility and heterogeneous host capabilities. the Mariposa design unifies the approaches taken by distributed file systems and distributed databases. In addition, Mariposa provides a general, flexible platform for the development of new algorithms for distributed query optimization, storage management, and scalable data storage structures. this flexibility is primarily due to a unique rule-based design that permits autonomous, local-knowledge decisions to be made regarding data placement, query execution location, and storage management.< >

关键词： Distributed databases database systems File systems Computer architecture Computer networks Computer science Query processing Memory Protection Object oriented modeling

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A map matching algorithm for intersections based on Floating Car data

A map matching algorithm for intersections based on Floating...

引用

international Conference on Advanced Communication Technology (ICACT)

作者： Wenjie Liao Weifeng Lv Tongyu Zhu DongDong Wu State Key Laboratory of Software Development Environment Beihang University China

the traditional map matching algorithms consider little about the complicated structure of the road network, and regard all roads as the same. However, in the transportation information system using the floating car data (FCD), the GPS sampling rate is low, and it is probable to figure out the incorrect result when the vehicle is in the intersection area. To solve this problem, this paper proposes a bidirectional heuristic map matching algorithm for intersections based on a data structure for intersections. this algorithm apply the data structure of intersections to separates the intersection part from common map matching, decreases the FCD map matching mistakes that caused by the complicated road network and the GPS errors, and increases the accuracy of map matching.

关键词： Sampling methods Global Positioning System Road vehicles Network topology Road transportation data structures Traffic control Information systems Intelligent transportation systems Navigation

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Computer guided product EMC compliance on user's workshop by means of cloud computing - methodologies and algorithms

Computer guided product EMC compliance on user's workshop by...

引用

international Conference on Industrial and Information Systems, ICIIS

作者： Wei Wu Yuejia Wu Institute of Innovation WEIWU INFO Lisbon Portugal Dept. of Cloud Computing Technology Zhoushan Puhua Elec. Info. Tech LTD Zhoushan China

All products are obligated to pass Electromagnetic Compatibility (EMC) tests before sale. Due to the uncertainty of Electromagnetic Interference (EMI) location in product, the product EMC compliance is expensive and time consuming. In this paper we present a novel solution to assist industrial users in product EMC compliance, which is a public Computer Aided EMC compliance service platform in Cloud, accessible through Internet by Desktop, Laptop, Pad or Smart Phone. the industrial users may measure voltage signals on EUT with a general-purpose oscilloscope, and upload the data to platform where the data are analyzed and the analysis results indicate the EMI location and EMI level on EUT, to guide users efficiently and effectively modify EUT to approach EMC compliance. It is low cost and easy to use, users only pay the Computing time in Cloud, no software installation, no operation skill and no EMC expertise are required. Methodologies and algorithms of proposed solution are introduced, and illustrated by example.

关键词： Conferences Computers Electromagnetic compatibility Electromagnetic interference Oscilloscopes Europe

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P-EDR: An algorithm for parallel implementation of Parzen density estimation from uncertain observations

P-EDR: An algorithm for parallel implementation of Parzen de...

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international Symposium on Parallel Processing

作者： P.E. Lopez de Teruel J.M. Garcia M. Acacio O. Canovas Departamento de Ingeniería y Tecnología de Computadores Facultad de Informática University of Murcia Murcia Spain

We have developed a parallel version of a new algorithm for nonparametric density estimation when the input samples are not directly known, or they have some noise. the algorithm is an extension of the Parzen method for exact observations, but management of uncertainty implies heavy computational loads in terms of both calculus and storage. therefore, a parallel version of the algorithm is more adequate to solve this extended problem in a practical time, specially for samples of medium-large sizes. Our parallel algorithm has been designed in an SPMD style and implemented in a message-passing parallel environment. An efficient treatment of the distribution of the main data structure among processors, together with a low communication cost scheme results in a high scalability of the algorithm. Preliminary performance evaluations in a cluster of workstations show excellent speed-up results.

关键词： Uncertainty Calculus Parallel algorithms Algorithm design and analysis data structures Costs Scalability Clustering algorithms Workstations

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Visionaray: A Cross-Platform Ray Tracing Template Library

Visionaray: A Cross-Platform Ray Tracing Template Library

引用

workshop on Software Engineering and Architectures for Realtime Interactive Systems (SEARIS)

作者： Stefan Zellmann Daniel Wickeroth Ulrich Lang University of Cologne

ISBN: (数字)9781538662748

ISBN: (纸本)9781538662755

We present the software architecture of the C++ ray tracing template library Visionaray, which provides generic algorithms and data structures as building blocks for applications that traverse rays through 3-D space. While many state of the art ray tracing libraries are vendor specific and focus only on acceleration data structure traversal, Visionaray is cross platform compatible and implements several ray tracing-related tasks such as parallel ray generation, shading, Monte Carlo integration, or texture sampling. Visionaray was developed with a strong focus on real-time and interactive rendering on high performance computing platforms. the generic programming approach allows for loose coupling of algorithms and efficient binary code that is optimized for data and instruction cache utilization. We discuss implementation details and software architecture considerations to achieve real-time performance on hardware platforms ranging from single-board mini computers to GPGPUs. We prove the effectiveness of our approach by evaluating and discussing four case studies that focus on real-time rendering, scientific visualization, and virtual reality.

关键词： Libraries Ray tracing C++ languages data structures Real-time systems Rendering (computer graphics) Programming

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Speeding Up Context-, Object- and Field-Sensitive SDG Generation

Speeding Up Context-, Object- and Field-Sensitive SDG Genera...

引用

IEEE international workshop on Source Code Analysis and Manipulation

作者： Jurgen Graf Karlsruhe Institute of Technology Karlsruhe Germany

System dependence graphs (SDGs) are an established tool for precise interprocedural program analysis. We present new techniques for the efficient generation of SDGs for full Java, which are context-, field- and object-sensitive. We show that previous approaches to the generation of interprocedural dependencies for Java do not scale, as they interfere with the points-to analysis. Our new algorithm is based on the WALA framework and reduces time and memory consumption up to 90%, while maintaining precision.

关键词： Runtime Object oriented modeling Scalability Computational modeling Analytical models Java data structures

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On the formation of periodic electric field domains in p-Si/SiGe quantum cascade structures

On the formation of periodic electric field domains in p-Si/...

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international workshop on Computational Electronics

作者： Ikonic Harrison Kelsall School of Electronic and Electrical Engineering University of Leeds Leeds UK

Biased semiconductor quantum well cascade structures, as are nowadays used in intersubband infrared photodetectors and lasers, are well known to be susceptible to the formation of electric field domains. the homogeneous electric field in a structure is broken, due to charge redistribution over individual wells and the appearance of the associated space-charge contribution to the potential. In this work we consider the formation of stationary periodic domains in p-type Si/SiGe cascade structures. Hole transport is described via scattering between quantized subbands in subsequent wells, as calculated using the 6/spl times/6 k.p method which accounts for the full anisotropy of heavy hole and light hole subbands. the scattering mechanisms taken into account are deformation potential (acoustic and optical phonons), alloy disorder, and carrier-carrier scattering. In order to find the possibility of domain formation the hole scattering rates between all pairs of states in subsequent wells in a homogeneous cascade are calculated, as a function of the electric field, taking the carrier heating (thermal self-consistency) into account. these are then used (via interpolation) to solve a system of rate equations for the subband populations in each quantum well, coupled with the discretized Poisson equation. In order to avoid use of contact boundary conditions, for which no experimental data is presently available, we use periodic boundary conditions, in which the electric field distribution in a long homogeneous cascade is assumed to break into an arbitrary number of periodic segments. this is a generalization of the period-doubling model described in (Ryzhii et al. (2000).

关键词： Quantum wells Charge carrier mobility Electric fields Germanium alloys Silicon alloys Infrared detectors Photodetectors

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dIP: A Non-intrusive Debugging IP for Dynamic data Race Detection in Many-Core

dIP: A Non-intrusive Debugging IP for Dynamic Data Race Dete...

引用

international Symposium on Parallel Architectures, algorithms and Networks (ISPAN)

作者： Chi-Neng Wen Shu-Hsuan Chou Tien-Fu Chen National Chung Cheng University Chiayi Taiwan

Traditional debug facilities are limited in providing debugging requirements for multicore parallel programming. Synchronization problems or bugs due to race conditions are particularly difficult to detect with software debugging tools. this work presents a fast and feasible hardware-assistant solution for many-core non-intrusive debugging. the key idea is to keep tracks of data accesses of shared memory areas and their lock synchronization activities by proposed data structures in proposed debugging IP (dIP). A page-based shared variable cache is provided to keep shared variables as long as possible, and an inexpensive pluggable off-chip RAM can eliminate the false-positive rate efficiently. To decrease the debugging traffic block, this work provides a thread library to specify shared memory/lock events and transmit those events to the dIP by a small proper hardware co-processor (eXtend dIP) of each core. Our experimental result shows the debugging traffic block (worse-case) by increasing cores, and adding tolerance buffers in XdIP can efficiently ease off. Moreover, the real workloads (SPLASH-2, MPEG-4, and H.264) are executed by the dIP non-instructive race-detection with only 4.7%~12.2% slow down in average. Finally, the hardware cost of dIP is also low when the growing of many-core.

关键词： Random access memory Hardware Multicore processing Parallel programming Computer bugs Software debugging data structures Read-write memory Yarn Libraries

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