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4th International Symposium on High Performance computing, ISHPC 2002

作者： Araki, Takuya Murai, Hitoshi Kamachi, Tsunehiko Seo, Yoshiki Parallel and Distributed Systems NEC Laboratory Real World Computing Partnership United States

ISBN: (纸本)354043674X

Optimizing compilers perform various optimizations in order to exploit the best performance from computer systems. However, some kinds of optimizations cannot be applied if values of variables or system parameters are not known at compilation time. To solve this problem, we designed and implemented a system which collects such information at run time, and dynamically recompiles part of the program based on it. In our system, recompilation and management of runtime information are carried out on processors other than those which execute user programs. Therefore, recompilation cost does not affect the program execution time, unlike other similar systems. The evaluation result shows that quite high speedup can be attained with this method. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Information management

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Noncontiguous I/O through PVFS

Noncontiguous I/O through PVFS

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IEEE International Conference on Cluster computing

作者： Avery Ching A. Choudhary Wei-keng Liao R. Ross W. Gropp Center for Parallel and Distributed Computing Northwestern University Evanston IL USA Mathematics and Computer Science Division Argonne National Laboratory Argonne IL USA

With the tremendous advances in processor and memory technology, I/O has risen to become the bottleneck in high-performance computing for many applications. The development of parallel file systems has helped to ease the performance gap, but I/O still remains an area needing significant performance improvement. Research has found that noncontiguous I/O access patterns in scientific applications combined with current file system methods, to perform these accesses lead to unacceptable performance for large data sets. To enhance performance of noncontiguous I/O, we have created list I/O, a native version of noncontiguous I/O. We have used the parallel Virtual File System (PVFS) to implement our ideas. Our research and experimentation shows that list I/O outperforms current noncontiguous I/O access methods in most I/O situations and can substantially enhance the performance of real-world scientific applications.

关键词： File systems File servers Concurrent computing Linux distributed computing Application software Costs Network servers Mathematics Computer science

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Using JIT compilation and configurable runtime systems for efficient deployment of java programs on ubiquitous devices

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International Conference on Ubiquitous computing, Ubicomp 2001

作者： Teodorescu, Radu Pandey, Raju Parallel and Distributed Computing Laboratory Computer Science Department University of California Davis United States

ISBN: (纸本)3540426140

As the proliferation of ubiquitous devices moves computation away from the conventional desktop computer boundaries, distributed systems design is being exposed to new challenges. A distributed system supporting a ubiquitous computing application must deal with a wider spectrum of hardware architectures featuring structural and functional differences, and resources limitations. Due to its architecture independent infrastructure and object-oriented programming model, the Java programming environment can support flexible solutions for addressing the diversity among these devices. Unfortunately, Java solutions are often associated with high costs in terms of resource consumption, which limits the range of devices that can benefit from this approach. In this paper, we present an architecture that deals with the cost and complexity of running Java programs by partitioning the process of Java program execution between system nodes and remote devices. The system nodes prepare a Java application for execution on a remote device by generating device-specific native code and application-specific runtime system on the fly. The resulting infrastructure provides the flexibility of a high-level programming model and the architecture independence specific to Java. At the same time the amount of resources consumed by an application on the targeted device are comparable to that of a native implementation. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Object oriented programming

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Optical interconnection as an IP macro of a CMOS library

Optical interconnection as an IP macro of a CMOS library

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Hot Interconnects

作者： T. Yoshikawa I. Hatakeyama K. Miyoshi K. Kurata J. Sasaki N. Kami T. Sugimoto M. Fukaishi K. Nakamura K. Tanaka H. Nishi T. Kudoh Real World Computing Partnership Optical interconnection NEC Laboratory Japan Photonic and Wireless Device Research Laboratories NEC Corporation Limited Tsukuba Ibaraki Japan Silicon System Research Laboratories NEC Corporation Limited Sagamihara Japan Production Technology Research Laboratories NEC Corporation Limited Kawasaki Japan Parallel and Distributed Architecture Group Real World Computing Partnership Tsukuba Ibaraki Japan

With the aim of producing a switch LSI with several-hundred-Gb/s-class throughput, we first developed LAN-LSIs with 10-Gb/s-class optical input/output (I/O) buffer. The optical I/O buffer was supplied as a set consisting of an optical-electrical package, soft or hard macros of the optical interface, and library files for a targeted CMOS technology. Using such library files, system LSI designers can implement an optical interface in their chips in a conventional design manner.

关键词： Libraries Optical buffering High speed optical techniques Optical attenuators Optical design Optical interconnections Integrated circuit interconnections Large scale integration CMOS logic circuits Packaging

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Runtime support for type-safe dynamic Java classes 14th

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14th European Conference on Object-Oriented Programming, ECOOP 2000

作者： Malabarba, Scott Pandey, Raju Gragg, Jeff Barr, Earl Barnes, J. Fritz Parallel and Distributed Computing Laboratory Computer Science Department University of California DavisCA95616 United States

ISBN: (纸本)3540676600

Modern software must evolve in response to changing condi- tions. In the most widely used programming environments, code is static and cannot change at runtime. This poses problems for applications that have limited down-time. More support is needed for dynamic evolution. In this paper we present an approach for supporting dynamic evolution of Java programs. In this approach, Java programs can evolve by changing their components, namely classes, during their execution. Changes in a class lead to changes in its instances, thereby allowing evolution of both code and state. The approach promotes compatibility with existing Java applications, and maintains the security and type safety controls imposed by Java's dynamic linking mechanism. Experimental analyses of our implementation indicate that the implementation imposes a moderate performance penalty relative to the unmodified virtual machine. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Java programming language

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Secure execution of mobile programs

Secure execution of mobile programs

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DARPA Information Survivability Conference and Exposition, DISCEX 2000

作者： Pandey, R. Hashii, B. Lal, M. Parallel and Distributed Computing Laboratory Computer Science Department University of California DavisCA95616 United States

ISBN: (纸本)0769504906

There is increasing interest in computing models that support extensibility of systems through code migration. Although appealing both from the system design and extensibility points of view, extensible systems are vulnerable to an external program's aberrant execution behaviors. We examine the problems of resource access control and resource consumption. We propose solutions for these problems and analyze their effectiveness. © 2000 IEEE.

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A Java graphical user interface for large-scale scientific computations in distributed systems 4

A Java graphical user interface for large-scale scientific c...

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4th International Conference/Exhibition on High Performance computing in the Asia-Pacific Region, HPC-Asia 2000

作者： Shen, X. Thiruvathukal, G. Liao, W. Choudhary, A. Singh, A. Center for Parallel and Distributed Computing Department of Electrical and Computer Engineering Northwestern University EvanstonIL60208 United States School of Computing Telecommunications and Information Sciences JHPC Laboratory DePaul University United States

ISBN: (纸本)0769505902

Large-scale scientific applications present great challenges to computational scientists in terms of obtaining high performance and in managing large datasets. These applications (most of which are simulations) may employ multiple techniques and resources in a heterogeneously distributed environment. Effective working in such an environment is crucial for modern large-scale simulations. In this paper, we present an integrated Java graphical user interface (IJ-GUI) that provides a control platform for managing complex programs and their large datasets easily. As far as performance is concerned, we present and evaluate our initial implementation of two optimization schemes: data replication and data prediction. Data replication can take advantage of 'temporal locality' by caching the remote datasets on local disks;data prediction, on the other hand, provides prefetch hints based on the datasets' past activities that are kept in databases. We first introduce the data contiguity concept in such an environment that guides data prediction. The relationship between the two approaches is discussed. © 2000 IEEE.

关键词： Forecasting

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A novel workflow management model based on mobile agents for Internet electronic commerce

A novel workflow management model based on mobile agents for...

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Technology of Object-Oriented Languages and Systems (TOOLS)

作者： Wu Gang Wu Quanyuan Wang Huaimin Parallel & Distributed Computing National Laboratory Changsha Institute of Technology Changsha China

Electronic commerce on the Internet is receiving a lot of attention. Workflow management is regarded as an effective mechanism for managing the business processes behind electronic commerce, but the present workflow management model has many drawbacks in this field. The paper gives a novel workflow management model based on mobile agents for Internet electronic commerce, and its advantages are also presented.

关键词： Mobile agents Internet Electronic commerce Companies Application software Technology management Business continuity distributed computing Laboratories Business communication

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Secure execution of mobile programs

Secure execution of mobile programs

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DARPA Information Survivability Conference & Exposition

作者： R. Pandey B. Hashii M. Lal Parallel and Distributed Computing Laboratory Computer Science Department University of California Davis CA USA

关键词： Operating systems Kernel Concurrent computing Computer science Internet Communication system security Government Laboratories Read only memory Java

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Data management for large‐scale scientific computations in high performance distributed systems

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Cluster computing 2000年第1期3卷 45-60页

作者： Choudhary, A. Kandemir, M. No, J. Memik, G. Shen, X. Liao, W. Nagesh, H. More, S. Taylor, V. Thakur, R. Stevens, R. Center for Parallel and Distributed Computing Department of Electrical and Computer Engineering Northwestern University Evanston USA Department of Computer Science and Engineering The Pennsylvania State University University Park USA Mathematics and Computer Science Division Argonne National Laboratory Argonne USA

With the increasing number of scientific applications manipulating huge amounts of data, effective high-level data management is an increasingly important problem. Unfortunately, so far the solutions to the high‐level data management problem either require deep understanding of specific storage architectures and file layouts (as in high-performance file storage systems) or produce unsatisfactory I/O performance in exchange for ease-of-use and portability (as in relational DBMSs). In this paper we present a novel application development environment which is built around an active meta-data management system (MDMS) to handle high-level data in an effective manner. The key components of our three-tiered architecture are user application, the MDMS, and a hierarchical storage system (HSS). Our environment overcomes the performance problems of pure database-oriented solutions, while maintaining their advantages in terms of ease-of-use and portability. The high levels of performance are achieved by the MDMS, with the aid of user-specified, performance-oriented directives. Our environment supports a simple, easy-to-use yet powerful user interface, leaving the task of choosing appropriate I/O techniques for the application at hand to the MDMS. We discuss the importance of an active MDMS and show how the three components of our environment, namely the application, the MDMS, and the HSS, fit together. We also report performance numbers from our ongoing implementation and illustrate that significant improvements are made possible without undue programming effort.

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