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Memory system Behavior of Java-based middleware 9

Memory system Behavior of Java-based middleware

引用

9th international symposium on High-Performance Computer Architecture

作者： Karlsson, M Moore, KE Hagersten, E Wood, DA Uppsala Univ Informat Technol Dept Comp Syst SE-75105 Uppsala Sweden

ISBN: (纸本)0769518710

Java-based middleware, and application servers, in particular are rapidly, gaining importance as a new cl ass of workload for commercial multiprocessor servers. SPEC has recognized this trend with its adoption of SPECjbb2000 and the new SPECjAppServer2001 (ECperf) as standard benchmarks. Middleware, by definition, connects other tiers of server software. SPECjbb is a simple benchmark that combines middleware services, a simple database server and client drivers into a single Java *** more closely models commercial middleware by, using a commercial application server and separate machines for the different tiers. Because it is a distributed benchmark, ECperf provides an opportunity, for architects to isolate the behavior of middleware. In this paper we present a detailed characterization of the memory, system behavior of ECperf and SPECjbb using both commercial server hardware and Simics full-system simulation. We find that the memory, footprint and primary, working sets,of these workloads are small compared to other commercial workloads (e.g., on-line transaction processing), and that a large fraction of the working sets are shared between processors. We observed two key, differences between ECperf and SPECjbb that highlight the importance of isolating the behavior of the middle tier first, ECperf has a larger instruction footprint, resulting in much higher miss rates for intermediate-size instruction caches. Second, SPECjbb's data set size increases linearly,, as the benchmark scales. up, while ECperf's remains roughly constant. This difference can lead to opposite conclusions on the design of multiprocessor memory, systems, such as the utility of moderate sized (i.e., 1 MB) shared caches in a chip multiprocessor.

关键词： Application software Data analysis databases Decision support systems Hardware Information technology Java Middleware Monitoring Virtual machining

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Mining frequent itemsets in distributed and dynamic databases

Mining frequent itemsets in distributed and dynamic database...

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作者： Otey, M.E. Wang, C. Parthasarathy, S. Veloso, A. Meira Jr., W. Computer and Information Science Dept. Ohio-State University United States Computer Science Dept. Universidade Federal de Minas Gerais Brazil

ISBN: (纸本)0769519784

Traditional methods for frequent itemset mining typically assume that data is centralized and static. Such methods impose excessive communication overhead when data is distributed, and they waste computational resources when data is dynamic. In this paper we present what we believe to be the first unified approach that overcomes these assumptions. Our approach makes use of parallel and incremental techniques to generate frequent itemsets in the presence of data updates without examining the entire database, and imposes minimal communication overhead when mining distributed databases. Further, our approach is able to generate both local and global frequent itemsets. This ability permits our approach to identify high-contrast frequent itemsets, which allows one to examine how the data is skewed over different sites. © 2003 IEEE.

关键词： Database systems

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Agent based dynamic recovery protocol in distributed databases

Agent based dynamic recovery protocol in distributed databas...

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international symposium on parallel and distributed Computing

作者： Yu Wang Xinsong Liu Research Laboratory University of Electronic Science and Technology Chengdu China

ISBN: (纸本)0769520693

Recovering from node failures is a critical issue in distributed database systems. In conventional log-based recovery protocols, the nodes providing recovery service may be overburdened, especially when the recovery is resource consuming. In this paper, an agent-based dynamic recovery protocol is presented. It divides the whole recovery process into three major steps: log-recovery, agent-recovery, and synchronization. The key idea of this protocol is to cache new database operations initiated during recovery into agents. All these cached operations are then replayed independently for further recovery. The analysis indicates that the new protocol can minimize internode's dependency and improve recovery speed As a result, system failure rate is cut down and the overall performance gets improved.

关键词： Protocols distributed databases Database systems Checkpointing Image restoration Computer crashes Delay Fault tolerance System performance distributed computing

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A general framework for searching in distributed data repositories

A general framework for searching in distributed data reposi...

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international symposium on parallel and distributed Processing (IPDPS)

作者： S. Bakiras P. Kalnis T. Loukopoulos Wee Siong Ng Department of Electrical & Electronic Engineering University of Hong Kong Hong Kong China School of Computing National University of Singapore Singapore Department of Computer Science Hong Kong University of Science and Technology Hong Kong China

This paper proposes a general framework for searching large distributed repositories. Examples of such repositories include sites with music/video content, distributed digital libraries, distributed caching systems, etc. The framework is based on the concept of neighborhood; each client keeps a list of the most beneficial sites according to past experience, which are visited first when the client searches for some particular content. Exploration methods continuously update the neighborhoods in order to follow changes in access patterns. Depending on the application, several variations of search and exploration processes are proposed. Experimental evaluation demonstrates the benefits of the framework in different scenarios.

关键词： Peer to peer computing Network servers distributed computing Drives Computer science Software libraries Internet Publishing Image databases Video sharing

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Optimal algorithms for scheduling divisible workloads on heterogeneous systems

Optimal algorithms for scheduling divisible workloads on het...

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international symposium on parallel and distributed Processing (IPDPS)

作者： O. Beaumont A. Legrand Y. Robert LaBRI UMR CNRS Bordeaux France ENS LIP UMR CNRS-INRIA Lyon France

In this paper, we discuss several algorithms for scheduling divisible loads on heterogeneous systems. Our main contributions are (i) new optimality results for single-round algorithms and (ii) the design of an asymptotically optimal multi-round algorithm. This multi-round algorithm automatically performs resource selection, a difficult task that was previously left to the user. Because it is periodic, it is simpler to implement, and more robust to changes in the speeds of the processors and/or communication links. On the theoretical side, to the best of our knowledge, this is the first published result assessing the absolute performance of a multi-round algorithm. On the practical side, extensive simulations reveal that our multi-round algorithm outperforms existing solution on a large variety of platforms, especially when the communication-to-computation ratio is not very high (the difficult case).

关键词： Scheduling algorithm Load modeling Processor scheduling Delay Multimedia databases Costs Algorithm design and analysis Robustness Computational modeling Books

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Performance modeling of the Grace Hash Join on cluster architectures

Performance modeling of the Grace Hash Join on cluster archi...

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international symposium on parallel and distributed Processing (IPDPS)

作者： E. Schikuta Institut für Informatik und Wirtschaftsinformatik University of Technology Vienna Vienna Austria

The aim of the paper is to develop a concise but comprehensive analytical model for the well-known Grace Hash Join algorithm on cost effective cluster architectures. This approach is part of an ongoing project to develop algorithms for the design of quasi-optimal query execution plans for parallel database systems. We try to concentrate on a limited number of characteristic parameters to keep the analytical model clear and focused. We believe that a meaningful model can be built upon only three characteristic parameter sets, describing main memory size, the I/O bandwidth and the disk bandwidth. We justify our approach by a practical implementation and a comparison of the theoretical and real performance values.

关键词： Clustering algorithms Workstations Database systems Relational databases Algorithm design and analysis Bandwidth parallel processing Analytical models Costs Database machines

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Early error detection in industrial strength cache coherence protocols using SQL

Early error detection in industrial strength cache coherence...

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international symposium on parallel and distributed Processing (IPDPS)

作者： M. Subramaniam Computer Science Department University of Nebraska Omaha NE USA

A table-driven approach for designing industrial strength cache coherence protocols based on relational database technology is described. Protocols are specified using several interacting multi-input, multi-output controller state machines represented as database tables. Protocol scenarios specified using SQL constraints are solved to automatically generate database tables, and to statically check protocol properties including absence of deadlocks and other protocol invariants. The debugged tables are mapped to hardware using SQL operations while preserving protocol properties. The approach is deployed at Fujitsu System Technology Division in the design of their next generation multiprocessor and has discovered several errors early in the design cycle.

关键词： Protocols Relational databases Control systems Industrial relations Hardware Debugging Multiprocessing systems Testing Computer errors Computer science

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A numerical study of some parallel algebraic preconditioners

A numerical study of some parallel algebraic preconditioners

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international symposium on parallel and distributed Processing (IPDPS)

作者： Xing Cai M. Sosonkina Simula Research Laboratory University of Oslo Oslo Norway University of Minnesota Duluth MN USA

We present a numerical study of several parallel algebraic preconditioners, which speed up the convergence of Krylov iterative methods when solving large-scale linear systems. The studied algebraic preconditioners are of two types. The first type includes simple block preconditioners using incomplete factorizations or preconditioned Krylov solvers on the subdomains. The second type is an enhancement of the first type in that Schur complement techniques are added to treat subdomain-interface unknowns. The numerical experiments show that the scalability properties of the preconditioners are highly problem dependent, and a simple Schur complement technique is favorable for achieving good overall efficiency.

关键词： Linear systems Vectors Sparse matrices Concurrent computing Iterative methods Partial differential equations Kernel Laboratories Convergence of numerical methods Large-scale systems

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GridBank: a Grid Accounting Services Architecture (GASA) for distributed systems sharing and integration

GridBank: a Grid Accounting Services Architecture (GASA) for...

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international symposium on parallel and distributed Processing (IPDPS)

作者： A. Barmouta R. Buyya Department of Computer Science and Software Engineering University of Western Australia Nedlands WA Australia Grid Computing and Distributed Systems (GRIDS) Lab Department of Computer Science and Software Engineering University of Melbourne Australia

Computational Grids are emerging as a new infrastructure for Internet-based parallel and distributed computing. They enable the sharing, exchange, discovery, and aggregation of resources distributed across multiple administrative domains, organizations and enterprises. To accomplish this, Grids need infrastructure that supports various services: security, uniform access, resource management, scheduling, application composition, computational economy, and accounting. Although several initiatives are engaged in the development of Grid technologies, Grid accounting issues are yet to be addressed. To overcome this limitation, we propose a new infrastructure called GridBank that provides services for accounting. The support of computational economy and accounting services can lead to a self-regulated accountability in Grid computing. This paper presents requirements of Grid accounting and different economic models within which it can operate and proposes a Grid Accounting Services Architecture to meet them. The paper highlights implementation issues with a detailed discussion on the format for various records/databases that the GridBank needs to maintain. It also presents protocols for interaction between the GridBank and various components within Grid computing environments.

关键词： Grid computing Computer architecture distributed computing Concurrent computing Internet Security Resource management Processor scheduling Computer applications Environmental economics

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parallel and distributed computing for an adaptive visual object retrieval system

Parallel and distributed computing for an adaptive visual ob...

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international symposium on parallel and distributed Processing (IPDPS)

作者： T. Kruger J. Wickel K.F. Kraiss Lehrstuhl für Technische Informatik Chair of Technical Computer Science RWTH Aachen University Germany

Computer vision and image processing has always been an active research domain that requires an enormous computational effort. In this paper we present the architecture of a modular object retrieval system. It is based on a dataflow concept which allows flexible adaptations to different tasks. This concept facilitates parallel processing as well as distributed computing. We also present a dynamic load balancing service for heterogeneous environments that has been integrated to improve system performance. first experiments show that the developed balancer performs better than standard balancing techniques in this environment.

关键词： distributed computing Operating systems Computer vision Load management Information retrieval Middleware Application software Image processing distributed processing Concurrent computing

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