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ACM International Conference Proceeding Series 2010年 vii-ix页

作者： Bode, Arndt Bouissou, Marc Distefano, Salvatore Puliafito, Antonio Trivedi, Kishor Walter, Max Technische Universität München Department of Computer Architecture Germany Electricité de France R and D/MRI Department France Università di Messina Multimedia and Distributed Systems Laboratory Italy Duke University Durham Dept. of Electrical and Computer Engineering United States

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NPB-MPJ: NAS Parallel Benchmarks Implementation for Message-Passing in Java

NPB-MPJ: NAS Parallel Benchmarks Implementation for Message-...

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Euromicro Conference on Parallel, Distributed and Network-Based Processing

作者： Damián A. Mallón Guillermo L. Taboada Juan Touriño Ramón Doallo Computer Architecture Group Dept. of Electronics and Systems University of A Coruña A Coruña Spain

Java is a valuable and emerging alternative for the development of parallel applications, thanks to the availability of several Java message-passing libraries and its full multithreading support. The combination of both shared and distributed memory programming is an interesting option for parallel programming multi-core systems. However, the concerns about Java performance are hindering its adoption in this field, although it is difficult to evaluate accurately its performance due to the lack of standard benchmarks in Java. This paper presents NPB-MPJ, the first extensive implementation of the NAS Parallel Benchmarks (NPB), the standard parallel benchmark suite, for Message-Passing in Java (MPJ) libraries. Together with the design and implementation details of NPB-MPJ, this paper gathers several optimization techniques that can serve as a guide for the development of more efficient Java applications for High Performance Computing (HPC). NPB-MPJ has been used in the performance evaluation of Java against C/Fortran parallel libraries on two representative multi-core clusters. Thus, NPB-MPJ provides an up-to-date snapshot of MPJ performance, whose comparative analysis of current Java and native parallel solutions confirms that MPJ is an alternative for parallel programming multi-core systems.

关键词： Java Libraries Parallel programming Multithreading Design optimization Industrial training Scalability computer architecture Application software Availability

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Application of image processing to measure road distresses

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WSEAS Transactions on Information Science and Applications 2008年第1期5卷 1-7页

作者： Rajab, Maher I. Alawi, Mohammad H. Saif, Mohammed A. Computer Engineering Dept. College of Computer and Information Systems University of Umm Al-Qura P.O. Box 5555 Makkah Saudi Arabia Civil Engineering Dept. College of Engineering and Islamic Architecture University of Umm Al-Qura P.O. Box 5555 Makkah Saudi Arabia

Pavements usually experience different types of distress due to repeated traffic loads, aggressive environmental conditions, construction materials, soil condition of the underline subgrade, and the method of construction. Longitudinal and transverse cracking, potholes, rutting, and bleeding are common examples of such distresses associated with flexible pavements. As time progresses, the severity of these distreaaes increases and consequently, ride quality is adversely affected. Early detection and measurement of the extent of distresses coupled with prompt reactive measures are necessary to keep the pavement function at an acceptable level. Traditional methods for distress detection and measurement are laborious, time consuming, and subject the involved personnel to accidents. In contrast, image measurement methods are effortless, safe, and can be performed in a short time. This research paper performs image processing measurements to estimate areas of a pothole and alligator cracking, and sets a program for plane measurements of an area that experience rutting. The image measurements are compared with the traditional measurements. The results show that image measurements are close to those obtained by using the traditional methods.

关键词： Traffic signals

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High performance java sockets for parallel computing on clusters

High performance java sockets for parallel computing on clus...

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21st International Parallel and Distributed Processing Symposium, IPDPS 2007

作者： Taboada, Guillermo L. Touriño, Juan Doallo, Ramón Computer Architecture Group Dept. of Electronics and Systems University of A Coruña A Coruña 15071 Spain

ISBN: (纸本)1424409101

The use of Java for parallel programming on clusters relies on the need of efficient communication middleware and high-speed cluster interconnect support. Nevertheless, currently there are no solutions that fully fulfill these issues. In this paper, a Java sockets library has been tailored to increase the efficiency of Java parallel applications on clusters. This library supports high-speed cluster interconnects and its API has been extended to meet the requirements of a high performance Java RMI implementation and Java parallel applications on clusters. Thus, it provides Java with a more efficient communication middleware on clusters. The performance evaluation of this middleware on a Gigabit Ethernet (GbE) and a Scalable Coherent Interface (SCI) cluster has shown experimental evidence of throughput increase. Moreover, qualitative aspects of the solution such as transparency to the user, interoperability with other systems and no need of source code modifications are decisive to boost the performance of existing Java parallel applications and their developments in high performance Java cluster computing. © 2007 IEEE.

关键词： Parallel processing systems

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Using simulation, historical and hybrid estimation systems for enhacing job scheduling on NOWs

Using simulation, historical and hybrid estimation systems f...

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2006 IEEE International Conference on Cluster Computing, Cluster 2006

作者： Hanzich, M. Hernández, P. Luque, E. Giné, F. Solsona, F. Lérida, J.L. Dept. Computer Architecture and Operating Systems University Autonoma of Barcelona Spain Dept. Computer Science University of Lleida Spain

ISBN: (纸本)1424403286

The computation capacity of the workstations in an open laboratory is enough to execute not only the local workload but some distributed computation. Unfortunately, the local workload introduces much uncertainty into the predictability of the system, which hinders the applicability of the job scheduling strategies. In this work, we introduce an estimation engine into our job scheduling system, termed CISNE. This prediction capacity allows us guarantee some limits to the turnaround time of parallel jobs. With this aim, three different estimation methods have been proposed and implemented in the CISNE system: a simulation tool, a historical system and an integration of both (hybrid). In this framework, we have compared our proposals to representative estimation methods in the literature. Likewise, we have analyzed these estimation methods in relation to different scheduling policies. These results reveal that the hybrid method achieves the best performance due to the fact that it combines the flexibility of a simulator to represent such a dynamic system as a non-dedicated cluster together with the accuracy given by the historical information. © 2006 IEEE.

关键词： Scheduling

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Development and Tuning Framework of Master/Worker Applications

Development and Tuning Framework of Master/Worker Applicatio...

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Automatic Performance Analysis 2005

作者： Morajko, Anna César, Eduardo Caymes-Scutari, Paola Mesa, José G. Costa, Genaro Margalef, Tomàs Sorribes, Joan Luque, Emilio Computer Architecture and Operating Systems Dept Universitat Autònoma de Barcelona Spain

Parallel/distributed programming is a complex task that requires a high degree of expertise to fulfill the expectations of high performance computation. The Master/Worker paradigm is one of the most commonly used because it is easy to understand and there is a wide range of applications that match this paradigm. However, there are certain features, such as data distribution and the number of workers that must be tuned properly to obtain adequate performance. In most cases such features cannot be tuned statically since they depend on the particular conditions of each execution. In this paper, we show a dynamic tuning environment that is based on a theoretical model of Master/Worker behavior and allows for the adaptation of such applications to the dynamic conditions of execution. The environment includes a pattern based application development framework that allows the user to concentrate on the design phase and makes it easier to overcome performance bottlenecks. © 2006 Dagstuhl Seminar Proceedings. All rights reserved.

关键词： dynamic tuning performance analysis performance model

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Designing a video-on-demand system for a Brazilian high speed network

Designing a video-on-demand system for a Brazilian high spee...

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26th IEEE International Conference on Distributed Computing systems Workshops, ICDCS 2006

作者： Souza, L. Ripoll, A. Yang, X.Y. Hernández, P. Suppi, R. Luque, E. Cores, F. Computer Architecture and Operating System Dept. Universitat Autonoma de Barcelona Spain Computer Science and Industrial Engineering Universitat de Lleida Spain

ISBN: (纸本)0769525415

Despite the availability of video-on-demand (VoD) services in a number of cities around the world, the large-scale deployment of VoD services has not been widely explored due to economic constraints. The high complexity founded in these systems makes the design process very difficult. This study presents a VoD system design for a high-speed metropolitan network, based on ATM technology, located in Brazil. To accomplish this goal, we have utilized our own simulation-based tool for VoD design called VODSim. This tool allows VoD research on any VoD platform, simulating the complete flow path followed by requests from clients to servers passing through the network infrastructure, allowing the configuration and tuning of multiple system parameters. Using VODSim, we analyse possible VoD architectures for the proposal environment (i.e. Centralized-server, Independent-servers, One-level-proxies and Distributed-servers), studying key-parameters that have influence in system design. Experimental results show that Distributed-server architecture is the one that adjusts better to the analyzed infrastructure, improving streaming capacity by 16%, 25% and 28% more than One-level-proxies, Centralized and Independent-servers respectively. Taking in account future growth in VoD system, the Distributed-server even provides an unlimited scalability through new local network incorporation and using P2P techniques. © 2006 IEEE.

关键词： systems analysis

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Designing a Video-on-Demand System for a Brazilian High Speed Network

Designing a Video-on-Demand System for a Brazilian High Spee...

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International Conference on Distributed Computing systems Workshop

作者： L. Souza A. Ripoll X.Y. Yang P. Hernandez F. Cores Computer Architecture & Operating System Dept. Universitat Autonoma de Barcelona Spain

Despite the availability of video-on-demand (VoD) services in a number of cities around the world, the large-scale deployment of VoD services has not been widely explored due to economic constraints. The high complexity founded in these systems makes the design process very difficult. This study presents a VoD system design for a highspeed metropolitan network, based on ATM technology, located in Brazil. To accomplish this goal, we have utilized our own simulation-based tool for VoD design called VODSim. This tool allows VoD research on any VoD platform, simulating the complete flow path followed by requests from clients to servers passing through the network infrastructure, allowing the configuration and tuning of multiple system parameters. Using VODSim, we analyse possible VoD architectures for the proposal environment (i.e. Centralized-server, Independent-servers, One-level-proxies and Distributedservers), studying key-parameters that have influence in system design. Experimental results show that Distributed-server architecture is the one that adjusts better to the analyzed infrastructure, improving streaming capacity by 16%, 25% and 28% more than One-level-proxies, Centralized and Independent-servers respectively. Taking in account future growth in VoD system, the Distributed-server even provides an unlimited scalability through new local network incorporation and using P2P techniques.

关键词： High-speed networks Network servers Computational modeling computer architecture Large-scale systems Proposals Analytical models Contracts Tin operating systems

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Bayesian sampling with applications to energy decay analysis in acoustically coupled spaces

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The Journal of the Acoustical Society of America 2005年第4_SUPPLEMENT期117卷 2493-2493页

作者： Tomislav Jasa Ning Xiang School of Architecture and Dept. of Electrical Computer and Systems Eng. Rensselaer Polytechnic Inst. Troy NY 12180

Bayesian inference comprises of parameter estimation and model selection/comparison. A common approach to solving both of these problems has been to use statistical sampling techniques that are inherently non‐Bayesian. This paper presents new Bayesian sampling method that solves both problems by changing the focus of Bayesian inference to the model selection problem first. In the papers [N. Xiang and P. M. Goggins, J. Acoust. Soc. Am. 110, 1415–1424 (2001); 113, 2685–2697 (2003)], the authors developed a model for the decay times and decay modes of acoustically coupled rooms in terms of measured Schroeder’s decay functions. This paper shows how the Bayesian sampling method can be used to evaluate the ‘‘Bayesian evidence’’ term used in model selection as well as determining the decay times along with error estimates.

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Sampling methods for decay time evaluation in acoustically coupled spaces

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The Journal of the Acoustical Society of America 2005年第4_SUPPLEMENT期117卷 2581-2581页

作者： Tomislav Jasa Ning Xiang Mendel Kleiner School of Architecture and Dept. of Electrical Computer and Systems Eng. Rensselaer Polytechnic Inst. Troy NY 12180

This paper applies the methods of Bayesian inference to the estimation of decay times in coupled rooms. Previous papers [N. Xiang and P. M. Goggans, J. Acoust. Soc. Am. 110, 1415–1424 (2001); 113, 2685–2697 (2003)] developed a solution method to estimate the decay times and the number of decay modes in terms of measured Schroeder’s decay functions. This paper extends the previous work by using statistical sampling methods to efficiently determine the decay times along with error estimates and evaluate the ‘‘Bayesian evidence’’ term used in determining the number of decay modes. This paper discusses the implemented methods together with the previous work to solve the problem of decay time estimation as well as determining the number of decay modes in acoustically coupled rooms.

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