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Synchronous distributed load balancing on totally dynamic networks

Synchronous distributed load balancing on totally dynamic ne...

引用

21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Bahi, Jacques M. Couturier, Raphaël Vernier, Flavien IUT de Belfort-Montbéliard BP 527 90016 Belfort Cedex France LISTIC Polytech'Savoie Université de Savoie Domaine Universitaire 74944 Annecy le Vieux Cedex France

ISBN: (纸本)1424409101

In this paper, first order diffusion load balancing algorithms for totally dynamic networks are investigated. Totally dynamic networks are networks in which the topology may change dynamically. Some edges or nodes can appear, disappear or move during the time. In our previous works on dynamic networks, the dynamism was limited to the edges. The main result of this study consists in proving that the load balancing algorithms reduce the unbalance on arbitrary dynamic networks. Notice that the hypotheses of our result are realistic and that for example the network does not have to be maintained connected. To study the behavior of these algorithms, we compare the load evolution by several simulations. © 2007 IEEE.

关键词： distributed computer systems

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File creation strategies in a distributed metadata file system

File creation strategies in a distributed metadata file syst...

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21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Devulapalli, Ananth Wyckoff, Pete Ohio Supercomputer Center 1 South Limestone St. Springfield OH 45502 Ohio Supercomputer Center 1224 Kinnear Road Columbus OH 43212

ISBN: (纸本)1424409101

As computing breaches petascale limits both in processor performance and storage capacity, the only way that current and future gains in performance can be achieved is by increasing the parallelism of the system. Gains in storage performance remain low due to the use of traditional distributed file systems such as NFS, where although multiple clients can access files at the same time, only one node can serve files to the clients. New file systems that distribute load across multiple data servers are being developed;however, most implementations concentrate all the metadata load at a single server still. Distributing metadata load is important to accommodate growing numbers of more powerful clients. Scaling metadata performance is more complex than scaling raw 1/0 performance, and with distributed metadata the complexity increases further. In this paper we present strategies for file creation in distributed metadata file systems. Using the PVFS distributed file system as our testbed, we present designs that are able to reduce the message complexity of the create operation and increase performance. Compared to the basecase create protocol implemented in PVFS, our design delivers near constant operation latency as the system scales, does not degenerate under high contention situations, and increases throughput linearly as the number of metadata servers increase. The design schemes are applicable to any distributed file system implementation. © 2007 IEEE.

关键词： Metadata

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Control of Line-Interactive UPS Connected in parallel Forming a Microgrid

Control of Line-Interactive UPS Connected in Parallel Formin...

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IEEE international symposium on Industrial Electronics

作者： Guerrero, Josep M. Berbel, Nestor Matas, Jose Sosa, Jorge L. Garcia de Vicuna, Luis Escola Univ Engn Tecn Ind Barcelona Sustainable Distributed Generat & Renewable Energ Dept Automat Control Syst Comte Urgell 187 Barcelona 08036 Spain Univ Politecn Cataluna Dept Elect Engn E-08028 Barcelona Spain

ISBN: (纸本)9781424407545

In this paper, the control strategy for an overall microgrid is presented. The control has two main levels: i) the droop control of the inverters, and ii) the control of the static bypass switch, and the droop settings for the management of the power flow. Thus, a flexible microgrid is obtained to operate in either grid-connected or islanded mode. Results. from line-interactive UPS inverters connected in parallel forming a microgrid are presented, showing the feasibility of the presented solution.

关键词： microgrids uninterruptible power systems distributed generation droop method

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A framework for experimental validation and performance evaluation in fault tolerant distributed system

A framework for experimental validation and performance eval...

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21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Meling, Hein Department of Electrical Engineering and Computer Science University of Stavanger 4036 Stavanger Norway

ISBN: (纸本)1424409101

Performing experimental evaluation of fault tolerant distributed systems is a complex and tedious task, and automating as much as possible of the execution and evaluation of experiments is often necessary to test a broad spectrum of possible executions of the system to obtain good coverage. The confidence of the results obtained from an experimental evaluation depends on the degree of control over the environment in which experiments are being executed. Typically, an uncontrolled environment is exposed to numerous sources of external influence that can affect the obtained results. Automated and repeated executions can be used to reduce the impact of such influences. In this paper, a framework for experimental validation and performance evaluation of fault management in a fault tolerant distributed system is presented. The framework provides a facility to execute experiments in a configured target system. It is based on injecting faults or other events needed to test the fault handling capability of the system. Relevant events are logged, and collected for postprocessing and analysis, e.g. to construct a single global timeline of events occurring at different nodes in the target system. This timeline of events can then be used to validate the behavior a system, and to evaluate its performance. ©2007 IEEE.

关键词： distributed computer systems

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Automatic parallelization of scripting languages: Toward transparent desktop parallel computing

Automatic parallelization of scripting languages: Toward tra...

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21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Ma, Xiaosong Li, Jiangtian Samatova, Nagiza F. North Carolina State University Department of Computer Engineering Raleigh NC 27695-8206 United States Oak Ridge National Laboratory Computer Science and Mathematics Division Oak Ridge TN 37831-6367 United States

ISBN: (纸本)1424409101

Desktop computing remains indispensable in scientific exploration, largely because it provides people with devices for human interaction and environments for interactive job execution. However, with today's rapidly growing data volume and task complexity, it is increasingly hard for individual workstations to meet the demands of interactive scientific data processing. The increasing cost of such interactive processing is hindering the productivity of end-to-end scientific computing workflows. While existing distributed computing systems allow people to aggregate desktop workstation resources for parallel computing, the burden of explicit parallel programming and parallel job execution often prohibits scientists to take advantage of such platforms. In this paper, we discuss the need for transparent desktop parallel computing in scientific data processing. As an initial step toward this goal, we present our on-going work on the automatic parallelization of the scripting language R, a popular tool for statistical computing. Our preliminary results suggest that a reasonable speedup can be achieved on real-world sequential R programs without requiring any code modification. © 2007 IEEE.

关键词： parallel processing systems

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Statistics API: DBMS-independent access and management of DBMS statistics in heterogeneous environments

Statistics API: DBMS-independent access and management of DB...

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9th international Conference on Enterprise Information systems (ICEIS 2007)

作者： Kraft, Tobias Mitschang, Bernhard Univ Stuttgart Inst Parallel & Distributed Syst D-70569 Stuttgart Germany

ISBN: (纸本)9789728865887

Many of todays applications access not a single but a multitude of databases running on different DBMSs. Federation technology is being used to integrate these databases and to offer a single query-interface to the user where he can run queries accessing tables stored on different remote databases. So, the optimizer of the federated DBMS has to decide what portion of the query should be processed by the federated DBMS itself and what portion should be executed at the remote systems. Thereto, it has to retrieve cost estimates for query fragments from the remote databases. The response of these databases typically contains cost and cardinality estimates but no statistics about the data stored in these databases. However, statistics are optimization-critical information which is the crucial factor for any kind of decision making in the optimizer of the federated DBMS. When this information is not available optimization has to rely on imprecise heuristics mostly based on default selectivities. To fill this gap, we propose Statistics API, a JAVA interface that provides DBMS-independent access to statistics data stored in databases running on different DBMSs. Statistics API also defines data structures used for the statistics data returned by or passed to the interface. We have implemented this interface for the three prevailing commercial DBMSs IBM DB2, Oracle and Microsoft SQL Server. These implementations are available under the terms of the GNU Lesser General Public License (LGPL). This paper introduces the interface, i.e. the methods and data structures of the Statistics API, and discusses some details of the three interface implementations.

关键词： query optimization optimizer statistics database meta data federation

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Performance evaluation of two parallel programming paradigms applied to the symplectic integrator running on COTS PC cluster

Performance evaluation of two parallel programming paradigms...

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21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Passos, Lorena B. C. Pfitscher, Gerson H. Rocha Filho, Tarcísio M. University of Brasilia Department of Computer Science 70.919-970 Brasilia - DF Brazil University of Brasilia Institute of Physics 70.919-970 Brasilia - DF Brazil

ISBN: (纸本)1424409101

There are two popular parallel programming paradigms available to high performance computing users such as engineering and physics professionals: message passing and distributed shared memory. It is interesting to have a comparative evaluation of these paradigms to choose the most adequate one. In this work, we present a performance comparison of these two programming paradigms using a Computational Physics problem as a case study. The self-gravitating ring model (Hamiltonian Mean Field model) for N particles is extensively studied in the literature as a simplified model for long range interacting systems in Physics. We parallelized and evaluated the performance of a simulation that uses the symplectic integrator to model an N particle system. From the obtained results it is possible to observe that message passing implementation of the symplectic integrator presents better results than distributed shared memory implementation. ©2007 IEEE.

关键词： parallel programming

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Open Internet-based sharing for desktop grids in iShare

Open Internet-based sharing for desktop grids in iShare

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21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Ren, Xiaojuan Basumallik, Ayon Pan, Zhelong Eigenmann, Rudolf School of ECE Purdue University West Lafayette IN 47907 United States VMWare Inc. Palo Alto CA 94304 United States

ISBN: (纸本)1424409101

This paper presents iShare, a distributed peer-to-peer Internet-sharing system, that facilitates the sharing of diverse resources located in different administrative domains over the Internet. iShare addresses the challenges of resource management in desktop grids, and integrates these resources with production grids. In this paper, we present a brief overview of the iShare system and describe how iShare leverages existing standards to provide novel solutions to the problems of resource dissemination, resource allocation and trust in desktop grids. We also discuss how iShare integrates production grid systems, such as the Teragrid, with desktop resources and compare the iShare approach with web-based user portals for production grids. To quantitatively evaluate our techniques, we measured the efficiency of resource allocation in iShare and the overheads associated with establishing trust and providing the iShare user interface for production grids. The evaluation results demonstrate that iShare enables open Internet sharing with efficiency, reliability, and security. © 2007 IEEE.

关键词： distributed computer systems

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Domain decomposition vs. master-slave in apparently homogeneous systems

Domain decomposition vs. master-slave in apparently homogene...

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21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Banino-Rokkones, Cyril Sem Sælandsvei 7-9 NO-7491 Trondheim Norway

ISBN: (纸本)1424409101

This paper investigates the utilization of the master-slave (MS) paradigm as an alternative to domain decomposition (DD) methods for parallelizing lattice gauge theory (LGT) models within distributed memory environments. The motivations for this investigation are twofold. First, LGT models are inherently difficult to parallelize efficiently with DD methods. Second, DD methods have proven useful for homogeneous environments, but are impractical for heterogeneous and dynamic environments. Besides, many modern supercomputer architectures that look homogeneous (such as multi-core or SMP), are in fact heterogeneous and dynamic environments. We highlight this issue by comparing a traditional first-come first-served MS implementation to a simple but yet efficient selective MS scheduling strategy that automatically accounts for system, heterogeneity and variability. Our experimental results with the parallelization of our LGT model, reveal that the selective MS implementation achieves good efficiency, but lacks of scalability. In contrast, the DD method is highly scalable, but at the expense of a poor efficiency. These results open up for a hybrid approach, where the MS and the DD methods would, be combined for achieving scalable high performance. © 2007 IEEE.

关键词： distributed computer systems

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A study for the parameters of a distributed framework that handles spatial areas

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10th international symposium on Advances in Spatial and Temporal databases

作者： Kantere, Verena Sellis, Timos Natl Tech Univ Athens Sch Elect & Comp Engn GR-10682 Athens Greece

ISBN: (纸本)9783540735397

In this work we study the construction of a framework for autonomous sites that are bound to spatial information and that form an overlay network;we investigate the parameters of such a distributed system in order to perform search guided by locality and directionality in space. We present the main parameters of the framework and propose appropriate values for them. A theoretical study discusses the overall search efficiency limits for two approaches concerning the main framework parameter, i.e. the distance metric. Furthermore, the behavior of the rest of the framework parameters is examined based on an experimental study.

关键词： distributed database systems

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