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Usage of the SCALASCA toolset for scalable performance analysis of large-scale parallel applications

Usage of the SCALASCA toolset for scalable performance analy...

引用

2nd International Workshop on Parallel Tools for High Performance computing, HPC 2008

作者： Wolf, Felix Wylie, Brian J.N. Ábrahám, Erika Becker, Daniel Frings, Wolfgang Fürlinger, Karl Geimer, Markus Hermanns, Marc-André Mohr, Bernd Moore, Shirley Pfeifer, Matthias Szebenyi, Zoltán Jülich Supercomputing Centre Forschungszentrum Jülich Germany Department of Computer Science Aachen Institute for Advanced Study in Computational Engineering Science RWTH Aachen University Germany Innovative Computing Laboratory University of Tennessee United States

ISBN: (纸本)9783540685616

SCALASCA is a performance toolset that has been specifically designed to analyze parallel application behavior on large-scale systems, but is also well-suited for small- and medium-scale HPC platforms. SCALASCA offers an incremental performance-analysis process that integrates runtime summaries with in-depth studies of concurrent behavior via event tracing, adopting a strategy of successively refined measurement configurations. A distinctive feature of SCALASCA is its ability to identify wait states even for very large processor counts. The current version supports the MPI, OpenMP and hybrid programming constructs most widely used in highly-scalable HPC applications.

关键词： Large scale systems

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Replay-based synchronization of timestamps in event traces of massively parallel applications

Replay-based synchronization of timestamps in event traces o...

引用

37th International Conference on Parallel Processing Workshops, ICPP 2008

作者： Becker, Daniel Linford, John C. Rabenseifner, Rolf Wolf, Felix Forschungszentrum Jülich Institute for Advanced Simulation 52425 Jülich Germany RWTH Aachen University Department of Computer Science 52056 Aachen Germany Virginia Tech. Department of Computer Science Blacksburg VA 24061 United States University of Stuttgart High-Performance Computing-Center 70550 Stuttgart Germany

ISBN: (纸本)9780769533759

Event traces are helpful in understanding the performance behavior of message-passing applications since they allow in-depth analyses of communication and synchronization patterns. However, the absence of synchronized hardware clocks may render the analysis ineffective because inaccurate relative event timings can misrepresent the logical event order and lead to errors when quantifying the impact of certain behaviors. Although linear offset interpolation can restore consistency to some degree, inaccuracies and time-dependent drifts may still disarrange the original succession of events - especially during longer runs. In our earlier work, we have presented an algorithm that removes the remaining violations of the logical event order postmortem and, in addition, have outlined the initial design of a parallel version. Here, we complete the parallel design and describe its implementation within the SCALASCA trace-analysis framework. We demonstrate its suitability for large-scale applications running on more than thousand application processes and show how the correction can improve the trace analysis of a real-world application example. © 2008 IEEE.

关键词： Trace analysis

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Dynamic scheduling of network resources with advance reservations in optical grids

Dynamic scheduling of network resources with advance reserva...

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作者： Tanwir, Savera Battestilli, Lina Perros, Harry Karmous-Edwards, Gigi Department of Computer Science North Carolina State University Raleigh NC United States Advanced Technology Group MCNC Grid Computing and Network Services RTP NC United States ISE Department NUST Institute of Information Technology NUST Pakistan

Advance reservation of lightpaths in grid environments is necessary to guarantee QoS and reliability. In this paper, we have evaluated and compared several algorithms for dynamic scheduling of lightpaths using a flexible advance reservation model. The main aim is to find the best scheduling policy for a grid network resource manager that improves network utilization and minimizes blocking. The scheduling of lightpaths involves both routing and wavelength assignment. Our simulation results show that minimum-cost adaptive routing where link costs are determined by the current and future usage of the link provides the minimum blocking. For wavelength assignment, we have used a scheme that reduces fragmentation by minimizing unused gaps. We have also analyzed approaches for failure recovery and resource optimization. Copyright © 2008 John Wiley & Sons, Ltd.

关键词： Grid computing

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Flexible Electronics: Ultrathin Silicon Circuits With Strain‐Isolation Layers and Mesh Layouts for High‐Performance Electronics on Fabric, Vinyl, Leather, and Paper (Adv. Mater. 36/2009)

引用

advanced Materials 2009年第36期21卷

作者： Dae‐Hyeong Kim Yun‐Soung Kim Jian Wu Zhuangjian Liu Jizhou Song Hoon‐Sik Kim Yonggang Y. Huang Keh‐Chih Hwang John A. Rogers Department of Materials Science and Engineering Beckman Institute for Advanced Science and Technology and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana‐Champaign Urbana Illinois 61801 (USA) Department of Civil and Environmental Engineering Northwestern University Evanston IL 60208 (USA) Department of Mechanical Engineering Northwestern University Evanston IL 60208 (USA) Institute of High Performance Computing 1 Fusionopolis Way #16‐16 Connexis 138632 Singapore (Singapore) Department of Mechanical and Aerospace Engineering University of Miami Coral Gables FL 33146 (USA) FML Departments of Engineering Mechanics Tsinghua University Beijing 100084 (P. R. China) Department of Chemistry Beckman Institute for Advanced Science and Technology and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana‐Champaign Urbana Illinois 61801 (USA) Department of Mechanical Science and Engineering Beckman Institute for Advanced Science and Technology and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana‐Champaign Urbana Illinois 61801 (USA) Department of Electrical and Computer Engineering Beckman Institute for Advanced Science and Technology and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana‐Champaign Urbana Illinois 61801 (USA)

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Frequency offset estimation for multi-static radar system

Frequency offset estimation for multi-static radar system

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Eunjung Yang Joohwan Chun Scientific Computing Laboratory Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

Bi-static and multi-static radar requires synchronization between transmitter(s) and receiver(s) due to their separated locations. Especially, for the target Doppler estimation, the carrier frequency offset occurred by the discord between the transmit and the receive ends should be estimated before the processing. In this paper, the system model for multi-static radar is provided as a similar form of multi-input multi-output (MIMO) communication system. However, unlike the MIMO case the frequency offset for each receiver is not identical to each other which makes the modeling and problem complicated. Based on the system model, the joint maximum likelihood (ML) solution and the suboptimal estimation is presented for frequency offset compensation. In this approximated approach, each receiver frequency offset is decoupled to others and the computational complexity becomes extremely low while it provides reasonable error performance for small frequency offsets and high signal to noise ratio (SNR).

关键词： Frequency estimation Maximum likelihood estimation Frequency synchronization MIMO Transmitters Delay effects Doppler radar Signal to noise ratio Oscillators Global Positioning System

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Lattice Reduction Aided Precoding Combined with SDM for Clusters of Correlated Users

Lattice Reduction Aided Precoding Combined with SDM for Clus...

引用

IEEE Conference on Wireless Communications and Networking

作者： Jaehyun Park Joohwan Chun Scientific Computing Laboratory Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

We present a lattice reduction (LR) aided preceding scheme combined with spatial division multiplexing (SDM) for clusters of correlated multiple users. Previously, the LR aided precoding schemes are deeply studied to transmit different symbols, simultaneously, to multiple users since it shows superior performance to linear precoding schemes like zero-forcing (ZF) algorithm. However, it has high complexity compared with linear precoding schemes. To resolve it, we exploit the spatial separability between clusters. That is, we apply the LR aided scheme for highly correlated users in a same cluster and to suppress the interferences from other clusters, we apply the ZF algorithm. Furthermore, we also propose a new SDM scheme to maximize the transmit signal to interference and noise ratio, which is formulated by generalized eigenvalue problem. We verify the performance of the proposed schemes by Monte-Carlo simulations and compare the computation complexities of them with the conventional LR aided precoding scheme.

关键词： Lattices MIMO Clustering algorithms Signal to noise ratio Transmitting antennas Linear discriminant analysis Interference Eigenvalues and eigenfunctions Receiving antennas Communications Society

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A 2D Time Domain Method for Electrical Analysis of Electronic Packages

A 2D Time Domain Method for Electrical Analysis of Electroni...

引用

Electronics Packaging Technology Conference (EPTC)

作者： En-Xiao Liu Xingchang Wei Zaw Zaw Oo Er-Ping Li Advanced Advanced Electronic Institute of High Performance Computing Science Park II Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore

This paper presents a two-dimensional full-wave method for efficient analysis of power integrity and electromagnetic interference (EMI) of high-speed electronic packages. The power/ground planes in electronic packages form a multilayered parallel-plate structure due to the practice of using whole metal plate as power or ground planes. Each pair of power/ground plane is suitable to be modeled by a 2D finite-different time domain (2D FDTD) method. Both the conductor loss and the substrate loss are also modeled by the 2D method. Besides the parallel-plate structure, electronic packages also comprise of many transmission lines including microstrip- and stripline-type structures. Those two types of structures are also resolved by the 2D method. A third type of structure in an electronic package is via, which is modeled by using a contour integral approach. So a unified solver may be developed in the context of 2D method for the signal and power integrity analysis of electronic packages. The electromagnetic interference (EMI) issue of electronic packages is also studied in this paper. The focus of it is the radiation due to the edge effect of the parallel-plate structure in a package. Numerical examples are given to demonstrate the method.

关键词： Time domain analysis Electronics packaging Electromagnetic interference Electromagnetic analysis High-speed electronics Finite difference methods Conductors Power transmission lines Microstrip Stripline

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Application of Parallelism SQL in Fuzzy Relational Databases

Application of Parallelism SQL in Fuzzy Relational Databases

引用

International Conference on computer science and Information Technology (CSIT)

作者： Hrudaya Ku Tripathy B.K. Tripathy Pradip K. Das Saraju Pr. Khadanga Department of Computer Science & Engineering Institute of Advanced Computer & Research RAYAGADA ORISSA INDIA Department of Computer Science & Engineering Institute of Advanced Computer and Research Rayagada Orissa India School of Computing Sciences VIT University Vellore Tamil Nadu India Department of Computer Science & Engineering Indian Institute of Technology Guwahati North Guwahati Assam INDIA Department of Computer Science & Engineering Indian Institute of Technology Guwahati North Guwahati Assam India

Recently, new applications have emerged that require database management systems with uncertainty capabilities. Many of the existing approaches to modeling uncertainty in database management systems are based on the theory of fuzzy sets. This paper introduces basic parallelism in fuzzy relational databases and its queries. Article describes basic characteristics of fuzzy relational databases and their properties, compares fuzzy logic with Boolean one in connection with fuzzy relational databases. Deal with data classification and form of storage fuzzy data in database systems. Paper describes fuzzy queries and parallelism in queries from view of today's systems and their connection to SQL language and its extension fuzzy SQL. Discuss about pipeline parallelism of query operators and its benefits.

关键词： Databases Relational databases Parallel processing Database systems Fuzzy sets Humans Database languages

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Accelerating advanced MRI reconstructions on GPUs 08

Accelerating advanced MRI reconstructions on GPUs

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2008 Conference on computing Frontiers, CF'08

作者： Stone, Sam S. Haldar, Justin P. Tsao, Stephanie C. Hwu, Wen-Mei W. Liang, Zhi-Pei Sutton, Bradley P. Center for Reliable and High-Performance Computing University of Illinois at Urbana-Champaign Urbana IL United States Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Urbana IL United States Bioengineering Department Biomedical Imaging Center Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign Urbana IL United States

ISBN: (纸本)9781605580777

Computational acceleration on graphics processing units (GPUs) can make advanced magnetic resonance imaging (MRI) reconstruction algorithms attractive in clinical settings, thereby improving the quality of MR images across a broad spectrum of applications. At present, MR imaging is often limited by high noise levels, significant imaging artifacts, and/or long data acquisition (scan) times. advanced image reconstruction algorithms can mitigate these limitations and improve image quality by simultaneously operating on scan data acquired with arbitrary trajectories and incorporating additional information such as anatomical constraints. However, the improvements in image quality come at the expense of a considerable increase in computation. This paper describes the acceleration of an advanced reconstruction algorithm on NVIDIA's Quadro FX 5600. Optimizations such as register allocating the voxel data, tiling the scan data, and storing the scan data in the Quadro's constant memory dramatically reduce the reconstruction's required bandwidth to off-chip memory. The Quadro's special functional units provide substantial acceleration of the trigonometric computations in the algorithm's inner loops, and experimentally-tuned code transformations increase the reconstruction's performance by an additional 20%. The reconstruction of a 3D image with 1283 voxels ultimately achieves 150 GFLOPS and requires less than two minutes on the Quadro, while reconstruction on a quadcore CPU is thirteen times slower. Furthermore, relative to the true image, the error exhibited by the advanced reconstruction is only 12%, while conventional reconstruction techniques incur error of 42%. In short, the acceleration afforded by the GPU greatly increases the appeal of the advanced reconstruction for clinical MRI applications. Copyright 2008 ACM.

关键词： Magnetic resonance imaging

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Replay-Based Synchronization of Timestamps in Event Traces of Massively Parallel Applications

Replay-Based Synchronization of Timestamps in Event Traces o...

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International Conference on Parallel Processing Workshops (ICPPW)

作者： Daniel Becker John C. Linford Rolf Rabenseifner Felix Wolf Forschungszentrum Jülich Institute for Advanced Simulation Julich Germany Department of Computer Science RWTH Aachen University Aachen Germany High-Performance Computing-Center University of Stuttgart Stuttgart Germany Department of Computer Science Virginia Technology Blacksburg VA USA

Event traces are helpful in understanding the performance behavior of message-passing applications since they allow in-depth analyses of communication and synchronization patterns. However, the absence of synchronized hardware clocks may render the analysis ineffective because inaccurate relative event timings can misrepresent the logical event order and lead to errors when quantifying the impact of certain behaviors. Although linear offset interpolation can restore consistency to some degree, inaccuracies and time-dependent drifts may still disarrange the original succession of events - especially during longer runs. In our earlier work, we have presented an algorithm that removes the remaining violations of the logical event order postmortem and, in addition, have outlined the initial design of a parallel version. Here, we complete the parallel design and describe its implementation within the SCALASCA trace-analysis framework. We demonstrate its suitability for large-scale applications running on more than a thousand application processes and show how the correction can improve the trace analysis of a real-world application example.

关键词： Clocks Synchronization Algorithm design and analysis Interpolation Program processors Accuracy Servers

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