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Dynamic application structuring on heterogeneous, distributed systems 13th

13th international parallel processing symposium, IPPS 1999 Held in Conjunction with the 10th symposium on parallel and distributed processing, SPDP 1999

作者： Chatterjee, Saurav SRI International Menlo ParkCA94025 United States

ISBN: (纸本)3540658319

The diversity of computers and networks within a distributed system makes these systems highly heterogeneous. System heterogeneity complicates the design of static applications that must meet quality-of-service (QoS) requirements. As part of the ERDoS2project, we have introduced a novel concept of dynamic application structuring where the system, at run time, chooses the best end-to-end implementation of an application, based on the system and resource attributes. Not only does this approach improve resource utilization and increase the total benefit to the user over that provided by the current static approaches, but it also is transparent to users and simplifies application development. We describe the models and mechanisms necessary for dynamic application structuring and use a set of multimedia applications to illustrate dynamic application structuring. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Quality of service

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Optimizing irregular HPF applications using Halos 13th

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13th international parallel processing symposium, IPPS 1999 Held in Conjunction with the 10th symposium on parallel and distributed processing, SPDP 1999

作者： Benkner, Siegfried C and C Research Laboratories NEC Europe Ltd Rathansallee 10 St AugustinD-53757 Germany

ISBN: (纸本)3540658319

This paper presents language features for High Performance Fortran (HPF) to specify non-local access patterns of distributed arrays, called halos, and to control the communication associated with these non-local accesses. Using these features crucial optimization techniques required for an efficient parallelization of irregular applications may be applied. The information provided by halos is utilized by the compiler and runtime system to optimize the management of distributed arrays and the computation of communication schedules. High-level communication primitives for halos enable the programmer to avoid redundant communication, to reuse communication schedules, and to hide communication overheads by overlapping communication with computation. Performance results of a kernel from a crash simulation code on the NEC Cenju-4, the IBM SP2, and on the NEC SX-4 show that by using the proposed extensions a performance close to hand-coded message-passing codes can be achieved for irregular problems. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Message passing

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Tailor-made operating systems for embedded parallel applications 13th

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13th international parallel processing symposium, IPPS 1999 Held in Conjunction with the 10th symposium on parallel and distributed processing, SPDP 1999

作者： Föhlich, Anthnio Augusto Schröder-Preikschat, Wolfgang GMD FIRST Rudower Chaussee 5 BerlinD-12489 Germany University of Magdeburg Universitätsplatz 2 MagdeburgD-39106 Germany

ISBN: (纸本)3540658319

This paper presents the PuRE/EPOS approach to deal with the high complexity of adaptable operating systems and also to diminish the distance between application and operating system. A system designed according to the proposed methodology may be automatically tailored to satisfy an specific application. In order to enable this, the application must be written referring to the inflated interfaces that export the system object repository and then be submitted to an analyzer that will proceed syntactical and data flow analysis to extract a blueprint for the operating system to be generated. This blueprint is then refined by dependency analysis against information about the execution scenario acquired from the user via visual tools. The outcome of this process is a configuration file consisting of selective realize keys that will support the compilation of the tailored operating system. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Blueprints

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Building an adaptive multimedia system using the utility model 13th

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13th international parallel processing symposium, IPPS 1999 Held in Conjunction with the 10th symposium on parallel and distributed processing, SPDP 1999

作者： Chen, Lei Khan, Shahadat Li, Kin F. Manning, Eric G. Siara Research Canada 305-8988 Fraserton Court BurnabyBCV5J 5H8 Canada Infranet Solutions Suite 409-100 Park Royal West VancouverBCV7T 1A2 Canada University of Victoria VictoriaBCV8W 3P6 Canada

ISBN: (纸本)3540658319

We present our experience of building a prototype system based on the Utility Model for adaptive multimedia. The Utility Model is proposed to capture the issues and dynamics in multi-session multimedia systems where the quality of service (QoS) of individual sessions is adapted to dynamic changes of available resources and of user preferences. We present the design and implementation of our prototype multimedia system, and report experimental results. We demonstrate that the Utility Model supports two types of adaptation: reactive adaptation for systems where only a subset of the applications follows the adaptation model, and proactive adaptation for systems where all the applications follow the adaptation model. Our results demonstrate that the Utility Model may be effectively used for dynamic quality adaptation in real-time multimedia systems. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Multimedia systems

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Infrastructure for building parallel database systems for multi-dimensional data

Proceedings of the International Parallel Processing Symposi...

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Proceedings of the international parallel processing symposium, IPPS 1999年 582-587页

作者： Chang, Chialin Ferreira, Renato Sussman, Alan Saltz, Joel Univ of Maryland College Park United States

Our study of a large set of scientific applications over the past three years indicates that the processing for multi-dimensional datasets is often highly stylized. The basic processing step usually consists of mapping the individual input items to the output grid and computing output items by aggregating, in some way, all the input items mapped to the corresponding grid point. In this paper, we discuss the design and performance of T2, an infrastructure for building parallel database systems that integrates storage, retrieval and processing of multi-dimensional datasets. It achieves its primary advantage from the ability to integrate data retrieval and processing for a wide variety of applications and from the ability to maintain and jointly process multiple datasets with different underlying grids. We present preliminary performance results comparing the implementation of two applications using the T2 services with custom-built integrated implementations.

关键词： parallel processing systems

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Infrastructure for building parallel database systems for multi-dimensional data

Infrastructure for building parallel database systems for mu...

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international symposium on parallel processing

作者： C. Chang R. Ferreira A. Sussman J. Saltz Department of Computer Science University of Maryland College Park MD USA Department of Pathology Johns Hopkins Medical Institutions Baltimore MD USA

Our study of a large set of scientific applications over the past three years indicates that the processing for multidimensional datasets is often highly stylized. The basic processing step usually consists of mapping the individual input items to the output grid and computing output items by aggregating, in some way, all the input items mapped to the corresponding grid point. In this paper we discuss the design and performance of T2, an infrastructure for building parallel database systems that integrates storage, retrieval and processing of multi-dimensional datasets. It achieves its primary advantage from the ability to integrate data retrieval and processing for a wide variety of applications and from the ability to maintain and jointly process multiple datasets with different underlying grids. We present preliminary performance results comparing the implementation of two applications using the T2 services with custom-built integrated implementations.

关键词： Database systems Microwave integrated circuits Information retrieval Computer science Educational institutions Pathology Application software Grid computing Reactive power Computational modeling

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A novel compilation framework for supporting semi-regular distributions in hybrid applications

A novel compilation framework for supporting semi-regular di...

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international symposium on parallel processing

作者： D.R. Chakrabarti P. Banerjee Center for Parallel and Distributed Computing ECE Department Tech.Institute Northwestern University Evanston IL USA

This paper explains how efficient support for semi-regular distributions can be incorporated in a uniform compilation framework for hybrid applications. The key focus of this work is in showing how, unlike other existing schemes, our scheme is able to minimize preprocessing overheads and maintain sophisticated communication optimizations (such as reduction of inter-processor communication during schedule generation and sharing of communicated information between regular and irregular accesses) even in the presence of semi-regular distributions. It is only natural that preprocessing overheads associated with semi-regular distributions be intermediate between those involved for regular and irregular distributions. This paper shows how various properties can be inferred for semi-regular distributions. These allow the use of the interval representation which in turn reduces the preprocessing overhead and makes possible compatible code generation for hybrid references. Experimental results on a 16-processor IBM SP-2 for a number of sparse applications using semi-regular distributions show that our scheme is feasible.

关键词： Sparse matrices Runtime Hybrid power systems Contracts Concurrent computing Costs Processor scheduling

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parallel out-of-core divide-and-conquer techniques with application to classification trees

Proceedings of the International Parallel Processing Symposi...

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Proceedings of the international parallel processing symposium, IPPS 1999年 555-562页

作者： Sreenivas, Mahesh K. AlSabti, Khaled Ranka, Sanjay Univ of Florida Gainesville United States

Classification is an important problem in the field of data mining. Construction of good classifiers is computationally intensive and offers plenty of scope for parallelization. Divide-and-conquer paradigm can be used to efficiently construct decision tree classifiers. We discuss in detail various techniques for parallel divide-and-conquer and extend these techniques to handle efficiently disk-resident data. Furthermore, a generic technique for parallel out-of-core divide-and-conquer problems is suggested. We present pCLOUDS, the parallel version of the decision tree classifier algorithm CLOUDS, capable of handling large out-of-core data sets. pCLOUDS exhibits excellent speedup, sizeup and scaleup properties which make it a competitive tool for data mining applications. We evaluate the performance of pCLOUDS for a range of synthetic data sets on the IBM-SP2.

关键词： parallel processing systems

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Novel compilation framework for supporting semi-regular distributions in hybrid applications

Proceedings of the International Parallel Processing Symposi...

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Proceedings of the international parallel processing symposium, IPPS 1999年 597-602页

作者： Chakrabarti, Dhruva R. Banerjee, Prithviraj Northwestern Univ Evanston United States

关键词： Program compilers

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Portable parallel programming for the dynamic load balancing of unstructured grid applications

Proceedings of the International Parallel Processing Symposi...

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Proceedings of the international parallel processing symposium, IPPS 1999年 338-342页

作者： Biswas, Rupak Das, Sajal K. Harvey, Daniel Oliker, Leonid NASA Ames Research Cent Moffett Field United States

The ability to dynamically adapt an unstructured grid (or mesh) is a powerful tool for solving computational problems with evolving physical features;however, an efficient parallel implementation is rather difficult, particularly from the viewpoint of portability on various multiprocessor platforms. We address this problem by developing PLUM, an automatic and architecture-independent framework for adaptive numerical computations in a message-passing environment. Portability is demonstrated by comparing performance on an SP2, an Origin2000, and a T3E, without any code modifications. We also present a general-purpose load balancer that utilizes symmetric broadcast networks (SBN) as the underlying communication pattern, with a goal to providing a global view of system loads across processors. Experiments on an SP2 and an Origin2000 demonstrate the portability of our approach which achieves superb load balance at the cost of minimal extra overhead.

关键词： parallel processing systems

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