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Performance analysis tools for parallel Java applications on shared-memory systems

Performance analysis tools for parallel Java applications on...

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International Conference on parallel Processing (ICPP)

作者： J. Guitart J. Torres E. Ayguade J.M. Bull European Center for Parallelism of Barcelona CEPBA Computer Architecture Department Technical University of Catalonia Barcelona Spain Edinburgh Parallel Computing Centre EPCC University of Edinburgh Edinburgh UK

In this paper we describe an instrumentation environment for the performance analysis and visualization of parallel applications written in JOMP, an OpenMP-like interface for Java. The environment includes two complementary approaches. The first one has been designed to provide a detailed analysis of the parallel behavior at the JOMP programming model level. At this level, the user is faced with parallel, work-sharing and synchronization constructs, which are the core of JOMP. The second mechanism has been designed to support an in-depth analysis of the threaded execution inside the Java virtual machine (JVM). At this level of analysis, the user is faced with the supporting threads layer monitors and conditional variables. The paper discusses the implementation of both mechanisms and evaluates the overhead incurred by them.

关键词： Performance analysis Java Yarn parallel processing Instruments Proposals parallel programming Application software Visualization Runtime

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Distributed parallel query processing on networks of workstations 8th

引用

8th International Conference on High Performance computing and Networking, HPCNEurope 2000

作者： Soleimany, Cyrus Dandamudi, Sivarama P. IBM Canada Toronto Canada Centre for Parallel and Distributed Computing School of Computer Science Carleton University Ottawa Canada

ISBN: (纸本)9783540675532

Network of workstations (NOW) is an attractive alternative to parallel database systems. Here we present a distributed architecture for parallel query processing on networks of workstations. We describe a comprehensive design that synthesizes knowledge from parallel and distributed systems area on scheduling, load sharing and loop scheduling. To study the performance of this architecture, we have implemented the distributed architecture using PVM on a Pentium-based NOW system. Our results show that the distributed architecture achieves good speedups and scaleups. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Query processing

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Communication support for distributed multimedia components 8

Communication support for distributed multimedia components

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8th Euromicro Workshop on parallel and Distributed Processing, EURO-PDP 2000

作者： Saleh, A. Justo, G.R.R. Centre for Parallel Computing University of Westminster 115 New Cavendish St. LondonW1M 8JS United Kingdom

ISBN: (纸本)0769505007

The development of distributed multimedia applications has always been a challenge for both expert and nonexpert developers. Middleware and supporting frameworks have emerged to simplify this process by providing reusable components that can be plugged together in many configurations to help application developers building up their applications. In distributed multimedia, the adoption of such frameworks allows the exchange of media (i.e. audio, video, etc.) and configuration data (i.e. where, how, etc.) transparently through the network. Application developers do not have to deal with details related to the location of data sources and destinations, network protocols used, or even the quality of service (QoS) requirements at the network level. Most framework designers tend to concentrate on the aspect of generalising and enhancing the functionality of the framework components and leave the communication between these components to be managed by one of the standard distributed object platforms such as CORBA, DCOM or JavaRMI. This paper describes research undertaken to tackle the problems of designing and managing communication between distributed multimedia components. The design of a supporting framework is explained with emphasis on the communicational aspect of its components. The paper also includes a case study which illustrate the use of the framework. © 2000 IEEE.

关键词： Common object request broker architecture (CORBA)

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Communication support for distributed multimedia components

Communication support for distributed multimedia components

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Euromicro Workshop on parallel and Distributed Processing

作者： A. Saleh G.R.R. Justo Centre for Parallel Computing University of Westminster London UK

关键词： Multimedia systems parallel processing Communication standards Java Identity-based encryption Tellurium Data systems Real time systems Games Teleconferencing

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A configuration-oriented framework for distributed multimedia applications 00

A configuration-oriented framework for distributed multimedi...

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2000 ACM Symposium on Applied computing, SAC 2000

作者： Saleh, Ahmed Justo, George R. R. Centre for Parallel Computing University of Westminster 115 New Cavendish St. London W1M 8JS United Kingdom

ISBN: (纸本)1581132409

Building distributed multimedia applications from pre-existing, reusable components will only take place when multimedia application developers can easily understand, extend and modify software components according to their needs. A new generation of supporting frameworks is now under investigation based on the principle of creating a configuration-oriented framework that supports the development of open distributed multimedia applications. Our idea is to create a framework focussing on the explicit construction of the system architecture in terms of components, connectors and relationships between components. This framework introduces a configurable approach that separates the concerns or paradigms of a distributed multimedia application into a set of reusable components that can be upgraded, shared, connected or substituted by components from other systems. © 2000 ACM.

关键词： Application programs

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HIPERTRANS: High performance transport network modelling and simulation 6

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6th International European Conference on parallel computing, Euro-Par 2000

作者： Ijaha, Stephen E. Winter, Stephen C. Kalantery, Nasser Centre for Parallel Computing Cavendish School of Computer Science University of Westminster 115 New Cavendish Street LondonW1M 8JS United Kingdom

ISBN: (纸本)9783540679561

HIPERTRANS (High Performance Transport network modelling and Simulation) is a fast and visually representative simulator that can predict traffic on a given urban road network. It was designed using object-oriented techniques and by re-engineering established road traffic models. It has the capability of interfacing to a range of UTC (urban traffic control) systems. Its high performance version was implemented by using a novel parallel programming platform called SPIDER;it has the capability of executing faster than real time and runs on distributed processors. The simulator provides a powerful GUI (graphical user interface) for entering road network models, configuring simulation runs, and visualising simulation results. The system provides helpful traffic diagnostic tools enabling local transport authorities, policy makers, researchers, and UTC manufacturers to gainfully exploit its functionality. The HIPERTRANS project was funded by the European Commission under the 4th Framework programme. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Roads and streets

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Performance of hybrid message-passing and shared-memory parallelism for discrete element modeling

Performance of hybrid message-passing and shared-memory para...

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2000 ACM/IEEE Conference on Supercomputing, SC 2000

作者： Henty, D.S. Edinburgh Parallel Computing Centre The University of Edinburgh James Clerk Maxwell Building The King's Buildings Mayfield Road EdinburghEH9 3JZ United Kingdom

ISBN: (纸本)0780398025

The current trend in HPC hardware is towards clusters of shared-memory (SMP) compute nodes. For applications developers the major question is how best to program these SMP clusters. To address this we study an algorithm from Discrete Element Modeling, parallelised using both the message-passing and shared-memory models simultaneously ("hybrid" parallelisation). The natural load-balancing methods are different in the two parallel models, the shared-memory method being in principle more efficient for very load-imbalanced problems. It is therefore possible that hybrid parallelism will be beneficial on SMP clusters. We benchmark MPI and OpenMP implementations of the algorithm on MPP, SMP and cluster architectures, and evaluate the effectiveness of hybrid parallelism. Although we observe cases where OpenMP is more efficient than MPI on a single SMP node, we conclude that our current OpenMP implementation is not yet efficient enough for hybrid parallelism to outperform pure message-passing on an SMP cluster. © 2000 IEEE.

关键词： Message passing

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An investigation of feedback guided dynamic scheduling of nested loops

An investigation of feedback guided dynamic scheduling of ne...

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International Conference on parallel Processing Workshops (ICPPW)

作者： D.J. Hancock J.M. Bull R.W. Ford T.L. Freeman Centre for Novel Computing University of Manchester Institute of Science and Technology Manchester UK Edinburgh Parallel Computing Centre University of Edinburgh Edinburgh UK

In previous papers (J.M. Bull, 1998; J.M. Bull et al., 1996; R.W. Ford et al., 1994) feedback guided loop scheduling algorithms have been shown to be very effective for certain loop scheduling problems. In particular they perform well for problems that involve a sequential outer loop and a parallel inner loop, and timing information gathered during one execution of the parallel inner loop can be used to inform the scheduling of the subsequent execution of this loop. The authors consider the extension of these feedback guided scheduling algorithms to the more important case of nested parallel loops, again within a sequential outer loop. We describe three alternative ways of scheduling nested loops; two are based on reducing the nested loops to a single loop and applying one-dimensional techniques; the third addresses the multidimensionality of the nested loops directly.

关键词： Feedback loop Dynamic scheduling Scheduling algorithm Processor scheduling Performance loss parallel processing Timing Concurrent computing Multidimensional systems Pipeline processing

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An approach to support a single service provider address image for wide area networks environment

An approach to support a single service provider address ima...

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International Conference on parallel computing in Electrical Engineering (PARLEC)

作者： J.H. Abawajy Centre for Parallel and Distributed Computing School of Computer Science Carleton University Ottawa ONT Canada

Request dispatching mechanism is at the heart of any cluster-computing environment. The goal is to support a single service provider address image for a given cluster of workstations. That is to say a given cluster publicises a single IP address and client requests are addressed to that IP address. This means, from the client's viewpoint, there are no nodes in the cluster, only services and the network names through which they are accessible. As a result, the cluster becomes a single virtual node. We propose a simple and elegant scheme for making the cluster transparent to clients outside the cluster such that the clients can interact with the cluster as if it were a single high-performance and highly available resource.

关键词： Wide area networks Workstations Computer architecture Network servers Dispatching Local area networks Distributed computing Computer science Heart Buildings

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Performance evaluation of nested-loop join processing on networks of workstations

Performance evaluation of nested-loop join processing on net...

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International Conference on parallel and Distributed Systems (ICPADS)

作者： K. Imasaki S. Dandamudi Centre for Parallel and Distributed Computing School of Computer Science Carleton University Ottawa ONT Canada

Networks of workstations (NOWs) are attractive for parallel processing due to their cost advantage. This paper investigates the performance issues in processing join operations and the inherent tradeoff in the networked workstation environment. Specifically, we look at the performance of the nested-loop join algorithm. Since NOWs are heterogeneous in nature, load sharing is important for their performance. We evaluated the performance of three load sharing methods: static equal, static proportional and dynamic scheduling with fixed-chunk size. The three scheduling methods are evaluated on an experimental heterogeneous network of workstations with non-query background loads. Our experimental result suggest that, when there is no background load, dynamic scheduling outperforms static equal scheduling (up to 40%) and marginally better (about 10% better speedup) than the static proportional scheduling. When there is dynamic background load on nodes, dynamic scheduling provides substantial performance improvement over the static proportional scheduling (up to 50%) and static equal scheduling (up to about 100%). In all cases, selection of an appropriate chunk size is important in dynamic scheduling.

关键词： Workstations Dynamic scheduling Concurrent computing Databases parallel processing Master-slave Processor scheduling Application software Throughput Distributed computing

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