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international symposium on Software Engineering for parallel and distributed systems

作者： Kacsuk, P Hungarian Acad Sci MTA SZTAKI H-1518 Budapest Hungary

ISBN: (纸本)0769501915

The paper introduces the concept of collective breakpoints and classifies the possible parallel breakpoints comparing their mechanisms. Based on the collective breakpoints the macrostep-by-macrostep execution mode has been defined. After introducing the concept of the execution tree and meta-breakpoints the systematic debugging of message passing parallel programs is explained. The main features and distributed structure of DIWIDE, a macrostep debugger is described. The integration of DIWIDE into the GRADE and WINPAR parallel programming environments is outlined. An algorithm is shown how to generate automatically the collective breakpoints in the GRADE environment.

关键词： Program debugging

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Austrian Grid: Overview on the project with focus on parallel applications

Austrian Grid: Overview on the project with focus on paralle...

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5th international symposium on parallel and distributed Computing

作者： Volkert, Jens Johannes Kepler Univ Inst Graph & Parallel Proc A-4040 Linz Austria

ISBN: (纸本)0769526381

GRIDs are large-scale distributed computing infrastructures that enable the integrated and collaborative use of high-end computers, networks, databases, and scientific instruments owned and managed by multiple organizations. Currently, a lot of national and international grid projects aim in building and using grids. One of them is the Austrian Grid. This project targets different areas of applications, including medical sciences, high-energy physics, applied numerical simulations, astrophysical simulations and solar observations, as well as meteorology and geophysics. Corresponding to the previous experience of the initiators of the project a lot of the applications are parallele ones. In the first part of the talk an overview on Austrian Grid will be presented. We will speak about the goals and the results in general. In the second part of the lecture the focus will be on parallel applications. We will discuss some answers given by the research of Austrian Grid to questions like: how to map parallel applications onto a grid, which kind of tools are necessary, which extensions of standard middleware are desirable. © 2006 IEEE.

关键词： Grid computing

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DPFS: A distributed parallel File System

DPFS: A Distributed Parallel File System

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30th international Conference on parallel Processing (ICPP 01)

作者： Shen, XH Choudhary, A Northwestern Univ Dept Elect & Comp Engn Ctr Parallel & Distributed Comp Evanston IL 60208 USA

ISBN: (纸本)0769512577;0769512585

One of 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-balanceing and user interface are also addressed in DPFS.

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

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SparkScore: Leveraging Apache Spark for distributed Genomic Inference 30

SparkScore: Leveraging Apache Spark for Distributed Genomic ...

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30th IEEE international parallel and distributed Processing symposium (IPDPS)

作者： Bahmani, Amir Sibley, Alexander B. Parsian, Mahmoud Owzar, Kouros Mueller, Frank North Carolina State Univ Dept Comp Sci Raleigh NC 27695 USA Duke Univ Sch Med Duke Canc Inst Durham NC USA Illumina Santa Clara CA USA

ISBN: (纸本)9781509036820

The method of the efficient score statistic is used extensively to conduct inference for high throughput genomic data due to its computational efficiency and ability to accommodate simple and complex phenotypes. Inference based on these statistics can readily incorporate a priori knowledge from a vast collection of bioinformatics databases to further refine the analyses. The sampling distribution of the efficient score statistic is typically approximated using asymptotics. As this may be inappropriate in the context of small study size, or uncommon or rare variants, resampling methods are often used to approximate the exact sampling distribution. We propose SparkScore, a set of distributed computational algorithms implemented in Apache Spark, to leverage the embarrassingly parallel nature of genomic resampling inference on the basis of the efficient score statistics. We illustrate the application of this computational approach for the analysis of data from genome-wide analysis studies (GWAS). This computational approach also harnesses the fault-tolerant features of Spark and can be readily extended to analysis of DNA and RNA sequencing data, including expression quantitative trait loci (eQTL) and phenotype association studies.

关键词： Computational efficiency

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parallel Factorization of a Sparse Representation of Integral Equations Using MPI

Parallel Factorization of a Sparse Representation of Integra...

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2010 IEEE international symposium Antennas and Propagation/CNC-USNC/URSI Radio Science Meeting

作者： Zeng, Zhiyong Xu, Xin Adams, Robert J. Univ Kentucky Lexington KY 40506 USA

A parallel factorization of a sparse multilevel representation of the EFIE impedance matrix is discussed. A nonblocking asynchronous communication protocol is used to transfer data between processors. Numerical exampl... 详细信息

ISBN: (纸本)9781424449682

关键词： EFIE impedance matrix MPI data transfer distributed memory parallel cluster distributed memory systems electric field integral equations electronic data interchange impedance matrix integral equation nonblocking asynchronous communication protocol parallel algorithms parallel factorization pattern clustering protocols sparse matrices sparse representation

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Scheduling Closed-Nested Transactions in distributed Transactional Memory

Scheduling Closed-Nested Transactions in Distributed Transac...

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26th IEEE international parallel and distributed Processing symposium (IPDPS) / Workshop on High Performance Data Intensive Computing

作者： Kim, Junwhan Ravindran, Binoy Virginia Tech ECE Dept Blacksburg VA 24061 USA

ISBN: (纸本)9780769546759

distributed software transactional memory (D-STM) is an emerging, alternative concurrency control model for distributed systems that promises to alleviate the difficulties of lock-based distributed synchronization-e.g., distributed deadlocks, livelocks, and lock convoying. We consider Herlihy and Sun's dataflow D-STM model, where objects are migrated to invoking transactions, and the closed nesting model of managing inner (distributed) transactions. We present a transactional scheduler called, reactive transactional scheduler (or RTS) to boost the throughput of closed-nested transactions. RTS determines whether a conflicting parent transaction must be aborted or enqueued according to the level of contention. If a transaction is enqueued, its nested inner transactions do not have to retrieve objects again, resulting in reduced communication delays. Our implementation of RTS in the HyFlow D-STM framework and experimental evaluations reveal that RTS improves throughput over D-STM without RTS, by as much as 88%.

关键词： Software Transactional Memory Closed-Nested Transactions Transactional Scheduling distributed systems

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parallelized simulation of complicated polymer structures and its efficiency

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IEICE TRANSACTIONS ON INFORMATION AND systems 1997年第4期E80D卷 531-537页

作者： Shida, K Ohno, K Kimura, M Kawazoe, Y Japan Advanced Institute of Science and Technology Hokuriku Ishikawa-ken. 901-21 Japan Institute for Materials Research Tohoku University Sendai-shi 980-77 Japan

A large scale simulation for polymer chains in good solvent is performed. The implementation technique for efficient parallel execution, optimization, and load-balancing are discussed on this practical application. Fi... 详细信息

关键词： parallel supercomputing computational physics Monte-Carlo simulation dynamic load balancing

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Algorithm for Virtual Synchronous Machine Phase Resynchronization 9

Algorithm for Virtual Synchronous Machine Phase Resynchroniz...

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9th IEEE international symposium on Power Electronics for distributed Generation systems (PEDG)

作者： Petti, Joseph J. Lewis, Patrick T. Kelly-Pitou, Katrina M. Reed, Gregory F. Univ Pittsburgh Swanson Sch Engn Dept Elect & Comp Engn 3700 OHara St Pittsburgh PA 15260 USA

ISBN: (纸本)9781538667057

In this paper, the idea of operating parallel inverters to mimic the dynamic stability of a synchronous generator (SG) is investigated when the inertia and damping constants are differed. These inverters are virtual synchronous machines (VSM) due to the replication of the inertial dynamics inherent to the SGs. Instead of using a conventional Phase-Lock Loop (PLL) in order to synchronize distributed generation (DG) to the grid frequency, the swing equation inherent to SG dynamics implemented. parallel VSM controlled inverters can have behaviors based on the constants of their individual swing equation. This can cause the phase angles to differ beyond IEEE synchronization limits. The proposed algorithm is implemented to correct the phase angle and return parallel VSMs to acceptable operating ranges. Simulation results are performed in PSCAD-EMTDC simulation environment.

关键词： distributed Generation Inertia Stability Virtual Synchronous Machine

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parallel Symbolic Observation Graph 15

Parallel Symbolic Observation Graph

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15th IEEE international symposium on parallel and distributed Processing with Applications (ISPA) / 16th IEEE international Conference on Ubiquitous Computing and Communications (IUCC)

作者： Ouni, Hiba Klai, Kais Abid, Chiheb Ameur Zouari, Belhassen Univ Tunis El Manar Fac Sci Tunis Tunis 2092 Tunisia Univ Carthage Higher Sch Commun Tunis Mediatron Lab Tunis Tunisia Univ Paris 13 Sorbonne Paris Cite CNRS UMR 7030 LIPN Villetaneuse France

ISBN: (纸本)9781538637906

Model checking is a powerful technique for verifying and analyzing complex systems in many application fields. The analysis process of complex and concurrent systems often requires large computation resources which represents a real challenge. Even with simple configurations, the well-known state explosion problem is faced as the generated state space of such systems grows exponentially with the number of the system components. Numerous methods and techniques have been developed to overcome this problem including parallel and distributed-memory processing. In this paper, we aim at improving the performances of the so called Symbolic Observation Graph (SOG) construction by using parallelization techniques. A SOG is a hybrid structure where the transitions of a system are divided into observed and unobserved ones. The nodes of this graph are then defined as sets of states linked with unobserved transitions (and encoded symbolically with a BDD) and edges are labeled with observed transitions only (and are explicitly represented). We propose two parallel algorithms to build the SOG. The first algorithm is dedicated for shared memory architectures, and is based on the distribution of the SOG construction on several threads using a dynamic load balancing scheme. The second algorithm is proposed for distributed memory architectures, and distributes the SOG construction on processes using a static load balancing scheme. These two algorithms are implemented and their performances are studied and compared to each other and to the sequential construction of the SOG.

关键词： distributed memory Multi threading parallel model checking Symbolic reachability

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Normality versus system mobility 9

Normality versus system mobility

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9th international Conference on parallel and distributed systems (ICPADS 2002)

作者： Gradinariu, M Univ Rennes 1 IRISA F-35042 Rennes France

ISBN: (纸本)0769517609

Normality, consitancy criteria stronger than sequentiality and equivalant to linearizability for the unary operations case, has the main advantage that it avoids the use of the "global real-time ordering". This work presents the first algorithm that implements normality without using strong communication primitives (i.e. atomic broadcast or global clock syncronization). Moreover, our implementation allows the dynamic changes of the system configuration, handles replication and refers the general case of multi-object operations. Although the use of terms as client or server our algorithm is entirely based on a peer-to-peer approach.

关键词： Broadcasting Clocks distributed algorithms distributed databases Network servers Network topology Peer to peer computing Real time systems Routing protocols Scalability

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