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Articles 31 - 43 of 43
Full-Text Articles in Computer Engineering
Compile-Time Performance Prediction Of Hpf/Fortran 90d, Manish Parashar, Salim Hariri
Compile-Time Performance Prediction Of Hpf/Fortran 90d, Manish Parashar, Salim Hariri
Electrical Engineering and Computer Science - All Scholarship
In this paper we present an interpretive approach for accurate and cost-effective performance prediction in a high performance computing environment, and describe the design of a compile-time HPF/Fortran 90D performance prediction framework based on this approach. The performance prediction framework has been implemented as a part of the HPF/Fortran 90D application development environment that integrates it with a HPF/Fortran 90D compiler and a functional interpreter. The current implementation of the environment framework is targeted to the iPSC/860 hypercube multicomputer system. A set of benchmarking kernels and application codes have been used to validate the accuracy, utility, and usability of the …
A Framework For Integrated Communication And I/O Placement, Rajesh Bordawekar, Alok Choudhary, J Ramanujam
A Framework For Integrated Communication And I/O Placement, Rajesh Bordawekar, Alok Choudhary, J Ramanujam
Electrical Engineering and Computer Science - All Scholarship
This paper describes a framework for analyzing dataflow within an out-of-core parallel program. Dataflow properties of FORALL statement are analyzed and a unified I/O and communication placement framework is presented. This placement framework can be applied to many problems, which include eliminating redundant I/O incurred in communication. The framework is validated by applying it for optimizing I/O and communication in out-of-core stencil problems. Experimental performance results on an Intel Paragon show significant reduction in I/O and communication overhead.
A Framework For Integrated Communication And I/O Placement, Rajesh Bordawekar, Alok Choudhary, J Ramanujam
A Framework For Integrated Communication And I/O Placement, Rajesh Bordawekar, Alok Choudhary, J Ramanujam
Electrical Engineering and Computer Science - All Scholarship
This paper describes a framework for analyzing dataflow within an out-of-core parallel program. Dataflow properties of FORALL statement are analyzed and a unified I/O and communication placement framework is presented. This placement framework can be applied to many problems, which include eliminating redundant I/O incurred in communication. The framework is validated by applying it for optimizing I/O and communication in out-of-core stencil problems. Experimental performance results on an Intel Paragon show significant reduction in I/O and communication overhead.
Webwork: Integrated Programming Environment Tools For National And Grand Challenges, Geoffrey C. Fox, Wojtek Furmanski, Marina Chen, Claudio Rebbi, James H. Cowie
Webwork: Integrated Programming Environment Tools For National And Grand Challenges, Geoffrey C. Fox, Wojtek Furmanski, Marina Chen, Claudio Rebbi, James H. Cowie
Physics - All Scholarship
Challenging-scale problems consistently demand solutions that fuse geographically distributed and heterogeneous data, personnel, expertise, and resources. For example, national health care problems require collaboration among experts of fields as diverse as medical informatics, public policy, robotics, and high performance computing to solve problems ranging from telemedicine to cost management and quality control. Indeed, many National Challenges include Grand Challenges as subcomponents. We can pose the Integrated Challenge as the solution of etaproblems hosted on world-wide metacomputers linking all three aspects: simulation, information processing, and collaboration. We suggest a hybrid approach to Integrated Challenges that combines World-Wide Web (WWW) technologies with …
Software And Hardware Requirements For Some Applications Of Parallel Computing To Industrial Problems, Geoffrey C. Fox
Software And Hardware Requirements For Some Applications Of Parallel Computing To Industrial Problems, Geoffrey C. Fox
Northeast Parallel Architecture Center
We discuss the hardware and software requirements that appear relevant for a set of industrial applications of parallel computing, these are divided into 33 separate categories, and come from a recent survey of industry in New York State. The software discussions includes data parallel languages, message passing, databases, and high-level integration systems. The analysis is based on a general classification of problem architectures originally developed for academic applications of parallel computing. Suitable hardware architectures are suggested for each application. The general discussion is crystalized with three case studies: computational chemistry, computational fluid dynamics, including manufacturing, and Monte Carlo Methods.
Techniques For Scheduling I/O In A High Performance Multimedia-On-Demand Server, Divyesh Jadav, Chutimet Srinilta, Alok Choudhary, P. B. Berra
Techniques For Scheduling I/O In A High Performance Multimedia-On-Demand Server, Divyesh Jadav, Chutimet Srinilta, Alok Choudhary, P. B. Berra
Electrical Engineering and Computer Science - All Scholarship
One of the key components of a multi-user multimedia-on-demand system is the data server. Digitalization of traditionally analog data such as video and audio, and the feasibility of obtaining network bandwidths above the gigabit-per-second range are two important advances that have made possible the realization, in the near future, of interactive distributed multimedia systems. Secondary-to-main memory I/O technology has not kept pace with advances in networking, main memory and CPU processing power. Consequently, the performance of the server has a direct bearing on the overall performance of such a system. In this paper we present a high-performance solution to the …
Runtime Support For In-Core And Out-Of-Core Data-Parallel Programs, Rajeev Thakur
Runtime Support For In-Core And Out-Of-Core Data-Parallel Programs, Rajeev Thakur
Electrical Engineering and Computer Science - All Scholarship
Distributed memory parallel computers or distributed computer systems are widely recognized as the only cost-effective means of achieving teraflops performance in the near future. However, the fact remains that they are difficult to program and advances in software for these machines have not kept pace with advances in hardware. This thesis addresses several issues in providing runtime support for in-core as well as out-of-core programs on distributed memory parallel computers. This runtime support can be directly used in application programs for greater efficiency, portability and ease of programming. It can also be used together with a compiler to translate programs …
Discourse-Level Analysis Of Abstracts For Information Retrieval: A Probabilistic Approach, Robert N. Oddy
Discourse-Level Analysis Of Abstracts For Information Retrieval: A Probabilistic Approach, Robert N. Oddy
School of Information Studies - Faculty Scholarship
The objective of this research is to contribute to our knowledge of how people seek information, and how computer systems can be designed to help in this process. Most information retrieval research since the field emerged in the 1950's has reduced these questions to that of trying to determine how documents relevant to a user's query might be selected from a large collection of texts---a question that has proved remarkably difficult to answer. The present work takes the stance that this particular reduction increasingly limits progress towards the objective stated above. It is directed instead towards the development of a …
Towards The Use Of Situational Information In Information Retrieval, Robert N. Oddy, Elizabeth D. Liddy, Ann Bishop, Eileen Martin, Joseph Elewononi, Bhaskaran Balakrishnan
Towards The Use Of Situational Information In Information Retrieval, Robert N. Oddy, Elizabeth D. Liddy, Ann Bishop, Eileen Martin, Joseph Elewononi, Bhaskaran Balakrishnan
School of Information Studies - Faculty Scholarship
This paper is an exploratory study of one approach to incorporating situational information into information retrieval systems, drawing on principles and methods of discourse linguistics. A tenet of discourse linguistics is that texts of a specific type possess a structure above the syntactic level, which follows conventions known to the people using such texts to communicate. In some cases, such as literature describing work done, the structure is closely related to situations, and may therefore be a useful representational vehicle for the present purpose. Abstracts of empirical research papers exhibit a well-defined discourse- level structure, which is revealed by lexical …
Architectural Support For Designing Fault-Tolerant Open Distributed Systems, Salim Hariri, Alok Choudhary, Behcet Sarikaya
Architectural Support For Designing Fault-Tolerant Open Distributed Systems, Salim Hariri, Alok Choudhary, Behcet Sarikaya
Electrical Engineering and Computer Science - All Scholarship
A distributed system consists of autonomous computing modules that interact with each other using messages. Designing distributed systems is more difficult than designing centralized systems for several reasons. Physical separation and the use of heterogeneous computers complicate interprocessor communication, management of resources, synchronization of cooperating activities, and maintenance of consistency among multiple copies of information. The main advantages of distributed systems include increased fault-tolerance capabilities through the inherent redundancy of resources, improved performance by concurrently executing a single task on several computing modules, resource sharing, and the ability to adapt to a changing environment (extensibility). Distributed systems cover a wide …
Pthomas: An Adaptive Information Retrieval System On The Connection Machine., Robert Oddy, Bhaskaran Balakrishnan
Pthomas: An Adaptive Information Retrieval System On The Connection Machine., Robert Oddy, Bhaskaran Balakrishnan
School of Information Studies - Faculty Scholarship
This paper reports the state of development of PThomas, a network based document retrieval system implemented on a massively parallel fine-grained computer, the Connection Machine. The program is written in C*, an enhancement of the C programming language which exploits the parallelism of the Connection Machine. The system is based on Oddy’s original Thomas program, which was highly parallel in concept, and makes use of the Connection Machine’s single instruction multiple data (SIMD) processing capabilities. After an introduction to systems like Thomas, and their relationship to spreading activation and neural network models, the current state of PThomas is described, including …
Ask For Information Retrieval: Part Ii. Results Of A Design Study, Robert N. Oddy, N J. Belkin, H M. Brooks
Ask For Information Retrieval: Part Ii. Results Of A Design Study, Robert N. Oddy, N J. Belkin, H M. Brooks
School of Information Studies - Faculty Scholarship
In 'ASK for Information Retrieval: Part P1, we discussed the theory and background to a design study for an information retrieval (IR) system based on the attempt to represent the anomalous states of knowledge (ASKs) underlying information needs. In Part 11, we report the methods and results of the design study, and our conclusions.
Ask For Information Retrieval: Part I. Background And Theory, Robert N. Oddy, N J. Belkin, H M. Brooks
Ask For Information Retrieval: Part I. Background And Theory, Robert N. Oddy, N J. Belkin, H M. Brooks
School of Information Studies - Faculty Scholarship
We report the results of a British Library Research and Development Department funded design study for an interactive information retrieval system which will determine structural representations of the anomalous states of knowledge (ASKs) underlying information needs, and attempt to resolve the anomalies through a variety of retrieval strategies performed on a database of documents represented in compatible structural formats. Part I discusses the background to the project and the theory underlying it, Part II (next issue) presents our methods, results and conclusions. Basic premises of the project were: that information needs are not in principle precisely specifiable; that it is …