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Proceedings of the eleventh workshop on parallel and distributed simulation

作者： Dilip Krishnaswamy Prithviraj Banerjee Elizabeth M. Rudnick Janak H. Patel Center for Reliable and High-Performance Computing University of IIlinois UrbanaIL Center for Parallel and Distributed Computing Northwestern University Evanston IL

ISBN: (纸本)9780818679650

We propose two new asynchronous parallel algorithms for test set partitioned fault simulation. The algorithms are based on a new two-stage approach to parallelizing fault simulation for sequential VLSI circuits in which the test set is partitioned among the available processors. These algorithms provide the same result as the previous synchronous two stage approach. However, due to the dynamic characteristics of these algorithms and due to the fact that there is very minimal redundant work, they run faster than the previous synchronous approach. A theoretical analysis comparing the various algorithms is also given to provide an insight into these algorithms. The implementations were done in MPI and are therefore portable to many parallel platforms. Results are shown for a shared memory multiprocessor.

关键词： asynchronous parallel algorithms test set partitioned fault simulation circuit analysis computing software portability dynamic characteristics redundant work MPI sequential VLSI circuits Message Passing Interface synchronous two stage approach shared memory multiprocessor circuit CAD

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A Java graphical user interface for large-scale scientific computations in distributed systems

A Java graphical user interface for large-scale scientific c...

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International Conference on High Performance computing in the Asia-Pacific Region

作者： X. Shen G. Thiruvathukal W. Liao A. Choudhary A. Singh Center for Parallel and Distributed Computing Department of Electrical and Computer Engineering Northwestern University Evanston IL USA

Large-scale scientific applications present great challenges to computational scientists in terms of obtaining high performance and in managing large datasets. These applications (most of which are simulations) may employ multiple techniques and resources in a heterogeneously distributed environment. Effective working in such an environment is crucial for modern large-scale simulations. In this paper, we present an integrated Java graphical user interface (IJ-GUI) that provides a control platform for managing complex programs and their large datasets easily. As far as performance is concerned, we present and evaluate our initial implementation of two optimization schemes: data replication and data prediction. Data replication can take advantage of 'temporal locality' by caching the remote datasets on local disks; data prediction, on the other hand, provides prefetch hints based on the datasets' past activities that are kept in databases. We first introduce the data contiguity concept in such an environment that guides data prediction. The relationship between the two approaches is discussed.

关键词： Java Graphical user interfaces Large-scale systems Computer interfaces distributed computing Computational modeling Visual databases Analytical models Data analysis Data visualization

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A distributed Multi-Storage Resource Architecture and I/O Performance Prediction for Scientific computing

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Cluster computing 2003年第3期6卷 189-200页

作者： Shen, X. Choudhary, A. Matarazzo, C. Sinha, P. Center for Parallel and Distributed Computing Department of Electrical and Computer Engineering Northwestern University Evanston USA Lawrence Livermore National Laboratory Livermore USA

I/O intensive applications have posed great challenges to computational scientists. A major problem of these applications is that users have to sacrifice performance requirements in order to satisfy storage capacity requirements in a conventional computing environment. Further performance improvement is impeded by the physical nature of these storage media even when state-of-the-art I/O optimizations are employed. In this paper, we present a distributed multi-storage resource architecture, which can satisfy both performance and capacity requirements by employing multiple storage resources. Compared to a traditional single storage resource architecture, our architecture provides a more flexible and reliable computing environment. This architecture can bring new opportunities for high performance computing as well as inherit state-of-the-art I/O optimization approaches that have already been developed. It provides application users with high-performance storage access even when they do not have the availability of a single large local storage archive at their disposal. We also develop an Application Programming Interface (API) that provides transparent management and access to various storage resources in our computing environment. Since I/O usually dominates the performance in I/O intensive applications, we establish an I/O performance prediction mechanism which consists of a performance database and a prediction algorithm to help users better evaluate and schedule their applications. A tool is also developed to help users automatically generate performance data stored in databases. The experiments show that our multi-storage resource architecture is a promising platform for high performance distributed computing.

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A 55 TFLOPS simulation of amyloid-forming peptides from yeast prion Sup35 with the special-purpose computer system MDGRAPE-3

A 55 TFLOPS simulation of amyloid-forming peptides from yeas...

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2006 ACM/IEEE Conference on Supercomputing, SC'06

作者： Narumi, Tetsu Ohno, Yousuke Okimoto, Noriaki Koishi, Takahiro Suenaga, Atsushi Futatsugi, Noriyuki Yanai, Ryoko Himeno, Ryutaro Fujikawa, Shigenori Taiji, Makoto Ikei, Mitsuru Intel K.K. High Performance Molecular Simulation Team Genomic Sciences Center Innovative Nanopatterning Laboratory Topochemical Design Laboratory Frontier Research System Advanced Center for Computing and Communication Software and Solutions Group Parallel and Distributed Solutions Group

ISBN: (纸本)0769527000

We have achieved a sustained performance of 55 TFLOPS for molecular dynamics simulations of the amyloid fibril formation of peptides from the yeast Sup35 in an aqueous solution. For performing the calculations, we used the MDGRAPE-3 system - -a special-purpose computer system for molecular dynamics simulations. Its nominal peak performance was 415 TFLOPS for Coulomb force calculations;this is the highest-ever performance reported for classical molecular dynamics simulations. Amyloid fibril formation is known to be related to the occurrence of severe diseases such as Alzheimer's, Parkinson's, and Creutzfeldt-Jakob diseases. The Sup35 protein is a "yeast prion protein," which forms mini-crystals due to aggregation;it forms an effective platform for studying the formation process of amyloid fibrils. In these simulations, we first elucidate that the amyloid-forming peptides GNNQQNY aggregate at a higher frequency than non-amyloid-forming peptides SQNGNQQRG;further, the GNNQQNY peptides tend to form parallel two-stranded -sheets that would grow into a cross- amyloid nucleus. The results are consistent with those obtained experimentally. Furthermore, we could observe an early elongation of the amyloid nucleus. This result is expected to contribute toward a deeper understanding of the amyloid growth mechanism. © 2006 IEEE.

关键词： Peptides

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DPFS: a distributed parallel file system

DPFS: a distributed parallel file system

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International Conference on parallel Processing (ICPP)

作者： Xiaohui Shen A. Choudhary Center for Parallel and Distributed Computing Department of Electrical and Computer Engineering Northwestern University Evanston IL USA

One of the challenges brought by large-scale scientific applications is how to avoid remote storage access by collectively using enough local storage resources to hold huge amount of data generated by the simulation while providing high performance I/O. DPFS, a distributed parallel File System, is designed and implemented to address this problem. DPFS collects locally distributed unused storage resources as a supplement to the internal storage of parallel computing systems to satisfy the storage capacity requirement of large-scale applications. In addition, like parallel file systems, DPFS provides striping mechanisms that divides a file into small pieces and distributes them across multiple storage devices for parallel data access. The unique feature of DPFS is that it provides three file levels with each file level corresponding to a file striping method. In addition to the traditional linear striping method, DPFS also provides a novel multidimensional striping method that can solve performance problems of linear striping for many popular access patterns. Other issues such as load-balancing and user interface are also addressed in DPFS.

关键词： File systems parallel processing Large-scale systems Spatial databases distributed computing distributed power generation Computational modeling Computer simulation Multidimensional systems Ear

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Efficient construction of catastrophic patterns for VLSI reconfigurable arrays with bidirectional links 4

Efficient construction of catastrophic patterns for VLSI rec...

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4th International Conference on computing and Information, ICCI 1992

作者： Nayak, Amiya Pagli, Linda Santoro, Nicola Center for Parallel and Distributed Computing School of Computer Science Carleton University OttawaKlS 5B6 Canada Dipartimento di Scienze dell'Informazione University of Pisa Corso Italia 40 Pisa56100 Italy

ISBN: (纸本)081862812X

Patterns of faults that are catastrophic for regular architectures, particularly the systolic arrays, have been studied. For a given link configuration, there are many fault patterns which are catastrophic. Among those, there is a particular fault pattern, called the reference fault pattern, which is crucial for the development of testing techniques;furthermore, the efficiency of any testing algorithm can be further improved in the presence of efficient algorithms for constructing the reference fault pattern. In this paper, we develop a new algorithm for the construction of the reference fault pattern for VLSI reconfigurable arrays in which the links are bidirectional. The complexity of the new algorithm is 0(kN) which is a significant improvement over the existing 0(N2) algorithm, where k is the number of bypass links, and N is the length of the largest bypass link. ©1992 IEEE.

关键词： Systolic arrays

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PowerShake: a low power driven clustering and factoring methodology for Boolean expressions 98

PowerShake: a low power driven clustering and factoring meth...

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Design, Automation and Test in Europe Conference and Exhibition

作者： S. Roy H. Arts P. Banerjee Ambit Design Systems Santa Clara USA Center for Parallel & Distributed Computing Northwestern University USA

ISBN: (纸本)9780818683596

This paper describes algebraic techniques that target low power consumption. A unique power cost function based on decomposed factored form representation of a Boolean expression is introduced to guide the structural transformations. Circuits synthesized by the SIS and POSE consume 54.5% and 10.4% more power than that obtained by our tool respectively.

关键词： Cost function Capacitance Energy consumption Design optimization Contracts Binary trees Art Concurrent computing Circuit synthesis Digital circuits

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A resource broker for computing nodes selection in grid computing environments 3rd

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3rd International Conference on Grid and Cooperative computing, GCC2004

作者： Yang, Chao-Tung Lai, Chuan-Lin Shih, Po-Chi Li, Kuan-Ching High-Performance Computing Laboratory Department of Computer Science and Information Engineering Tunghai University Taichung407 Taiwan Parallel and Distributed Processing Center Department of Computer Science and Information Management Providence University Shalu Taichung433 Taiwan

ISBN: (纸本)3540235647

As Grid computing is becoming a reality, there is a need for managing and monitoring the available resources worldwide, as well as the need for conveying these resources to the everyday user. This paper describes a resource broker with its main function as to match the available resources to the user’s needs. The use of the resource broker provides a uniform interface to access any of the available and appropriate resources using user’s credentials. The resource broker runs on top of the Globus Toolkit. Therefore, it provides security and current information about the available resources and serves as a link to the diverse systems available in the Grid. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Grid computing

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A Multi-Dimensional Assessment Model and Its Application in E-learning Courses of Computer Science 20

A Multi-Dimensional Assessment Model and Its Application in ...

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21st Annual Conference of the Special Interest Group in Information Technology Education, SIGITE 2020

作者： Luo, Jiwen Lu, Feng Wang, Tao Key Lab. of Parallel and Distributed Computing College of Computer National University of Defense Technology Changsha China National Engineering Research Center for Big Data Technology and System Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781450370455

Computer science is a practical discipline. It is always a great challenge to evaluate students' computer practice using computer-aided means for large scale students. We always need to address problems such as suspected plagiarism and deviation of the overall difficulty factor. In this paper, a multi-dimensional assessment model is designed for CS courses based on the detailed practice processing data in an E-learning system. The model comprehensively evaluates the students' learning process and results in three aspects of correctness, originality, and quality detection. Besides, the teacher can easily participate in the assessment according to their needs. The correctness is an essential requirement, and the originality is based on the clustering results of students' behaviors after clone detection to curb homework plagiarism. SonarQube is used to detect code quality and put forward higher requirements for codes. Manual participation intelligence has improved the flexibility and applicability of the model to a certain extent. We applied this model on the EduCoder online education platform and carried out a comprehensive analysis of 485 students in the parallel Programming Principles and Practice Class of Huazhong University of Science and Technology. Experiment results confirm the distinction, rationality, and fairness of the model in assessing student performance. It not only gives students a credible, comprehensive score in large-scale online practical programming courses but also gives teachers and students corresponding suggestions based on the evaluation results. Furthermore, the model can be extended to other online education platforms. © 2020 ACM.

关键词： Students

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An integrated graphical user interface for high performance distributed computing

An integrated graphical user interface for high performance ...

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International Symposium on Database Engineering and Applications (IDEAS)

作者： X. Shen W.-K. Liao A. Choudhary Center for Parallel and Distributed Computing Department of Electrical and Computer Engineering Northwestern University Evanston IL USA

ISBN: (纸本)0769511406

It is very common that modern large-scale scientific applications employ multiple compute and storage resources in a heterogeneously distributed environment. Working effectively and efficiently in such an environment is one of the major concerns for designing meta-data management systems. The authors present an integrated graphical user interface (GUI) that makes the entire environment virtually an easy-to-use control platform for managing complex programs and their large datasets. To hide the I/O latency when the the user carries out interactive visualization, aggressive prefetching and caching techniques are employed in our GUI. The performance numbers show that the design of our Java GUI has achieved the goals of both high performance and ease-of-use.

关键词： Graphical user interfaces distributed computing Analytical models Delay Data visualization Prefetching Visual databases Large-scale systems Environmental management Java

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