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Articles 181 - 210 of 532
Full-Text Articles in Computer Sciences
Thoughts On The Structure Of An Mpj Reference Implementation, Mark Baker, Bryan Carpenter
Thoughts On The Structure Of An Mpj Reference Implementation, Mark Baker, Bryan Carpenter
Northeast Parallel Architecture Center
We sketch a proposed reference implementation for MPJ, the Java Grande Forum's MPI-like message-passing API [9, 3]. The proposal relies heavily on RMI and Jini for finding computational resources, creating slave processes, and handling failures. User-level communication is implemented efficiently directly on top of Java sockets.
The Gateway System: Uniform Web Based Access To Remote Resources, Tomasz Haupt, Erol Akarsu, Geoffrey C. Fox, Alexey Kalinichenko
The Gateway System: Uniform Web Based Access To Remote Resources, Tomasz Haupt, Erol Akarsu, Geoffrey C. Fox, Alexey Kalinichenko
Northeast Parallel Architecture Center
Exploiting our experience developing the WebFlow system, we designed the Gateway system to provide seamless and secure access to computational resources at ASC MSRC. The Gateway follows our commodity components strategy, and it is implemented as a modern three-tier system. Tier 1 is a high-level front-end for visual programming, steering, run-time data analysis and visualization, built on top of the Web and OO commodity standards. Distributed object-based, scalable, and reusable Web server and Object broker middleware forms Tier 2. Back-end services comprise Tier 3. In particular, access to high performance computational resources is provided by implementing the emerging standard for …
Formal Analysis Of A Secure Communication Channel: Secure Core-Email Protocol, Dan Zhou, Shiu-Kai Chin
Formal Analysis Of A Secure Communication Channel: Secure Core-Email Protocol, Dan Zhou, Shiu-Kai Chin
Electrical Engineering and Computer Science - All Scholarship
To construct a highly-assured implementation of secure communication channels we must have clear definitions of the security services, the channels, and under what assumptions these channels provide the desired services. We formally define secure channel services and develop a detailed example. The example is a core protocol common to a family of secure email systems. We identify the necessary properties of cryptographic algorithms to ensure that the email protocol is secure, and we verify that the email protocol provides secure services under these assumptions. We carry out the definitions and verifications in higher-order logic using the HOL theorem-prover. All our …
Performance Analysis Of Csma And Btma Protocols In Multihop Networks: Part Ii - Multiple Channel Case, Lin Wu, Pramod K. Varshney
Performance Analysis Of Csma And Btma Protocols In Multihop Networks: Part Ii - Multiple Channel Case, Lin Wu, Pramod K. Varshney
Electrical Engineering and Computer Science - All Scholarship
Busy tone multiple access protocols have been used in multihop networks to reduce the effect of the hidden terminal problem. This paper demonstrates another approach to reduce the effect of the hidden terminal problem namely the use of multiple channel schemes. A protocol that uses both the busy tone and the multiple channel techniques achieves the best performance. Using a Markov chain model and an approximation, the throughput performance of the multiple channel nonpersistent CSMA protocol and the multiple channel conservative BTMA protocol in a large network is evaluated and compared. The results show that the multichannel CSMA and BTMA …
Continuous Models Of Computation For Logic Programs: Importing Continuous Mathematics Into Logic Programming's Algorithmic Foundations, Howard A. Blair, Fred Dushin, David W. Jakel, Angel J. Rivera, Metin Sezgin
Continuous Models Of Computation For Logic Programs: Importing Continuous Mathematics Into Logic Programming's Algorithmic Foundations, Howard A. Blair, Fred Dushin, David W. Jakel, Angel J. Rivera, Metin Sezgin
Electrical Engineering and Computer Science - All Scholarship
Logic programs may be construed as discrete-time and continuous-time dynamical systems with continuous states. Techniques for obtaining explicit formulations of such dynamical systems are presented and the computational performance of examples is presented. Extending 2-valued and n-valued logic to continuousvalued logic is shown to be unique, up to choosing the representations of the individual truth values as elements of a continuous field, provided that lowest degree polynomials are selected. In the case of 2-valued logic, the constraint that enables the uniqueness of the continualization is that the Jacobian matrices of the continualizations of the Boolean connectives have only affine entries. …
Truce: Agent Coordination Through Concurrent Interpretation Of Role-Based Protocols, Wilfred C. Jamison, Douglas Lea
Truce: Agent Coordination Through Concurrent Interpretation Of Role-Based Protocols, Wilfred C. Jamison, Douglas Lea
Electrical Engineering and Computer Science - All Scholarship
Established protocols for coordination are essential for implementing joint-action activities among collaborating software agent. Most existing agents, however, are designed only to support static protocols, which limit their interaction domain to specific sets of agents. We develop an agent collaboration framework for open systems that enables an agent to expand its acquaintance set and to adapt to various coordination protocols dynamically. This is achieved through writing coordination scripts that are interpreted at collaboration time. We developed a role-based coordination language for writing these scripts, where the coordination mechanism used is the concurrent interpretation of a single script by the participants …
A Matrix-Based Approach To Global Locality Optimization, Mahmut Kandemir, Alok Choudhary, J. Ramanujam, Prith Banerjee
A Matrix-Based Approach To Global Locality Optimization, Mahmut Kandemir, Alok Choudhary, J. Ramanujam, Prith Banerjee
Electrical Engineering and Computer Science - All Scholarship
Global locality optimization is a technique for improving the cache performance of a sequence of loop nests through a combination of loop and data layout transformations. Pure loop transformations are restricted by data dependences and may not be very successful in optimizing imperfectly nested loops and explicitly parallelized programs. Although pure data transformations are not constrained by data dependences, the impact of a data transformation on an array might be program-wide; that is, it can affect all the references to that array in all the loop nests. Therefore, in this paper we argue for an integrated approach that employs both …
Benchmarks And Standards For The Evaluation Of Parallel Job Schedulers, Steve J. Chapin, Walfredo Cirne, Dror G. Feitelson, James Patton Jones
Benchmarks And Standards For The Evaluation Of Parallel Job Schedulers, Steve J. Chapin, Walfredo Cirne, Dror G. Feitelson, James Patton Jones
Electrical Engineering and Computer Science - All Scholarship
The evaluation of parallel job schedulers hinges on the workloads used. It is suggested that this be standardized, in terms of both format and content, so as to ease the evaluation and comparison of different systems. The question remains whether this can encompass both traditional parallel systems and metacomputing systems. This paper is based on a panel on this subject that was held at the workshop, and the ensuing discussion; its authors are both the panel members and participants from the audience. Naturally, not all of us agree with all the opinions expressed here...
Webhla - An Interactive Multiplayer Environment For High Performance Distributed Modeling And Simulation, Geoffrey C. Fox, Wojtek Furmanski, Subhash Nair, Hasan T. Ozdemir, Zeynep Odcikin-Ozdemir, Tom A. Pulikal
Webhla - An Interactive Multiplayer Environment For High Performance Distributed Modeling And Simulation, Geoffrey C. Fox, Wojtek Furmanski, Subhash Nair, Hasan T. Ozdemir, Zeynep Odcikin-Ozdemir, Tom A. Pulikal
Northeast Parallel Architecture Center
The process of integrating DoD Modeling and Simulation paradigms around the new HLA/RTI standards proceeds in parallel with the onset of new Object Web standards for distributed objects and componentware, emergent at the crossroads of CORBA, DCOM, Java, and XML based distributed object technologies. We describe here our WebHLA approach which integrates both trends by offering Object Web based implementation of the HLA framework. WebHLA follows a three-tier architecture including: a) Web / Commodity based interactive simulation authoring and runtime front-ends given by Java applets or DirectX multiplayers; b) software bus in the middleware, given by Object Web RTI i.e. …
Mpijava: An Object-Oriented Java Interface To Mpi, Mark Baker, Bryan Carpenter, Geoffrey C. Fox, Sung Hoon Ko
Mpijava: An Object-Oriented Java Interface To Mpi, Mark Baker, Bryan Carpenter, Geoffrey C. Fox, Sung Hoon Ko
Northeast Parallel Architecture Center
A basic prerequisite for parallel programming is a good communication API. The recent interest in using Java for scientific and engineering application has led to several international efforts to produce a message passing interface to support parallel computation. In this paper we describe and then discuss the syntax, functionality and performance of one such interface, mpiJava, an object-oriented Java interface to MPI. We first discuss the design of the mpiJava API and the issues associated with its development. We then move on to briefly outline the steps necessary to 'port' mpiJava onto a range of operating systems, including Windows NT, …
Building Distributed Systems For The Pragmatic Object Web, Geoffrey C. Fox, Wojtek Furmanski, Tomasz Haupt
Building Distributed Systems For The Pragmatic Object Web, Geoffrey C. Fox, Wojtek Furmanski, Tomasz Haupt
Northeast Parallel Architecture Center
We review the growing power and capability of commodity computing and communication technologies largely driven by commercial distributed information systems. These systems are built from CORBA, Microsoft's COM, JavaBeans, and rapidly advancing Web approaches. One can abstract these to a three-tier model with largely independent clients connected to a distributed network of servers. The latter host various services including object and relational databases and of course parallel and sequential computing. High performance can be obtained by combining concurrency at the middle server tier with optimized parallel back end services. The resultant system combines the needed performance for large-scale HPCC applications …
Mpijava 1.2: Api Specification, Bryan Carpenter, Geoffrey C. Fox, Sung-Hoon Ko, Sang Lim
Mpijava 1.2: Api Specification, Bryan Carpenter, Geoffrey C. Fox, Sung-Hoon Ko, Sang Lim
Northeast Parallel Architecture Center
This document defines the API of mpiJava, a Java language binding for MPI 1.1. The document is not a standalone specification of the behaviour of MPI--it is meant to be read in conjunction with the MPI standard document [2]. Subsections are laid out in the same way as in the standard document, to allow cross-referencing. Where the mpiJava binding makes no significant change to a particular section of the standard document, we will just note here that there are no special issues for the Java binding. This does not mean that the corresponding section of the standard is irrelevant to …
Using Webhla To Integrate Hpc Fms Modules With Web/Commodity Based Distributed Object Technologies Of Corba, Java, Com And Xml, Geoffrey C. Fox, Wojtek Furmanski, Ganesh Krishnamurthy, Hasan T. Ozdemir, Zeynep Odcikin-Ozdemir, Tom A. Pulikal, Krishnan Rangarajan, Ankur Sood
Using Webhla To Integrate Hpc Fms Modules With Web/Commodity Based Distributed Object Technologies Of Corba, Java, Com And Xml, Geoffrey C. Fox, Wojtek Furmanski, Ganesh Krishnamurthy, Hasan T. Ozdemir, Zeynep Odcikin-Ozdemir, Tom A. Pulikal, Krishnan Rangarajan, Ankur Sood
Northeast Parallel Architecture Center
HLA standards for interoperability between various DoD Modeling and Simulation paradigms are being enforced in parallel with the rapid onset of new Object Web / Commodity standards for distributed objects and componentware, emergent at the crossroads of CORBA, COM, Java, and XML technologies. WebHLA explores synergies between and integrates both trends by offering Object Web based implementation of the HLA framework. Our goal is to deliver a uniform platform that facilitates conversion of legacy codes to and development of new codes in compliance with HLA, HPC and Object Web standards. We outline here the overall design of WebHLA, we summarize …
Internetics: Technologies, Applications And Academic Field, Or, Parallel Computing And Computational Science Do Not Quite Work, Geoffrey C. Fox
Internetics: Technologies, Applications And Academic Field, Or, Parallel Computing And Computational Science Do Not Quite Work, Geoffrey C. Fox
Northeast Parallel Architecture Center
Ten years ago, we were all sure that parallel computing technology and the interdisciplinary academic field of computational science would be center pieces of both academic and economic growth. We show that this insight was, in principle, correct but was an incomplete vision for large-scale computation implies both increased computer power and increasing numbers of users and applications. Parallel computing undoubtedly works on essentially all problems, but we were unable to produce deployable software systems. Further, few industries could achieve adequate return to justify investment in parallel computers, except in a few areas such as databases. Computational science is the …
A Hierarchical Analysis Approach For High Performance Computing And Communication Applications, Salim Hariri, Pramod Varshney, Luying Zhou, Vinod V. Menon, Shihab Ghaya
A Hierarchical Analysis Approach For High Performance Computing And Communication Applications, Salim Hariri, Pramod Varshney, Luying Zhou, Vinod V. Menon, Shihab Ghaya
Electrical Engineering and Computer Science - All Scholarship
The proliferation of high performance computers and high-speed networks has made parallel and distributed computing feasible and cost-effective on High Performance Computing and Communication Systems (HPCC). However, the design, analysis and development of parallel and distributed applications on such computing systems are still very challenging tasks. Therefore, there is a great need for an integrated multilevel analysis methodology to assist in designing and analyzing the performance of both existing and proposed systems. Currently, there are no comprehensive analysis methods that address such diverse needs. This paper presents a three-level hierarchical modeling approach for analyzing the end-to-end performance of an application …
Definitional Interpreters For Higher-Order Programming Languages, John C. Reynolds
Definitional Interpreters For Higher-Order Programming Languages, John C. Reynolds
College of Engineering and Computer Science - Former Departments, Centers, Institutes and Projects
Abstract. Higher-order programming languages (i.e., languages in which procedures or labels can occur as values) are usually defined by interpreters that are themselves written in a programming language based on the lambda calculus (i.e., an applicative language such as pure LISP). Examples include McCarthy’s definition of LISP, Landin’s SECD machine, the Vienna definition of PL/I, Reynolds ’ definitions of GEDANKEN, and recent unpublished work by L. Morris and C. Wadsworth. Such definitions can be classified according to whether the interpreter contains higher-order functions, and whether the order of application (i.e., call by value versus call by name) in the defined …
Dynamic Management Of Heterogeneous Resources, Jerrell Watts, Marc Rieffel, Stephen Taylor
Dynamic Management Of Heterogeneous Resources, Jerrell Watts, Marc Rieffel, Stephen Taylor
College of Engineering and Computer Science - Former Departments, Centers, Institutes and Projects
This paper presents techniques for dynamic load balancing in heterogeneous computing environments. That is, the techniques are designed for sets of machines with varying processing capabilities and memory capacities. These methods can also be applied to homogenous systems in which the effective compute speed or memory availability is reduced by the presence of other programs running outside the target computation. To handle heterogeneous systems, a precise distinction is made between an abstract quantity of work, which might be measured as the number of iterations of a loop or the count of some data structure, and the utilization of resources, measured …
Visual Interactive Modeling In A Java-Based Hierarchical Modeling And Simulation System, Robert G. Sargent, Thorsten Daum
Visual Interactive Modeling In A Java-Based Hierarchical Modeling And Simulation System, Robert G. Sargent, Thorsten Daum
College of Engineering and Computer Science - Former Departments, Centers, Institutes and Projects
The desired set of properties of a modern simulation system is presented. The portion of the Hierarchical Modeling And Simulation System-Java (HiMASS-j) used for specifying Hierarchical Control Flow Graph (HCFG) Models is described. The specification of HCFG Models in HiMASS-j is by visual interactive modeling through the use of graphical user interfaces and dialog boxes. HCFG Models are specified using two complementary hierarchical specification structures: one to specify the components that comprise a model and how these components are interconnected, and the other to specify the behaviors of individual atomic components. A simulation of a traffic intersection using HiMASS-j is …
Partial Shape Matching Using Genetic Algorithms, Ender Ozcan, Chilukuri K. Mohan
Partial Shape Matching Using Genetic Algorithms, Ender Ozcan, Chilukuri K. Mohan
Electrical Engineering and Computer Science - All Scholarship
Shape recognition is a challenging task when images contain overlapping, noisy, occluded, partial shapes. This paper addresses the task of matching input shapes with model shapes described in terms of features such as line segments and angles. The quality of matching is gauged using a measure derived from attributed shape grammars. We apply genetic algorithms to the partial shape-matching task. Preliminary results, using model shapes with 6 to 70 features each, are extremely encouraging.
An Efficient Parallel Algorithm For High Dimensional Similarity Join, Khaled Alsabti, Sanjay Ranka, Vineet Singh
An Efficient Parallel Algorithm For High Dimensional Similarity Join, Khaled Alsabti, Sanjay Ranka, Vineet Singh
Electrical Engineering and Computer Science - All Scholarship
Multidimensional similarity join finds pairs of multi-dimensional points that are within some small distance of each other: The 6-k-d-B tree has been proposed as a data structure that scales better as the number of dimensions in-creases compared to previous data structures. We present a cost model of the E-k-d-B tree and use it to optimize the leaf size. We present novel parallel algorithms for the similarity join using the E-k-d-B tree. A load-balancing strategy based on equi-depth histograms is shown to work well for uniform or low-skew situations, whereas another based on weighted equi-depth histograms works far better for high-skew …
Darp: Java-Based Data Analysis And Rapid Prototyping Environment For Distributed High Performance Computations, Erol Akarsu, Geoffrey C. Fox, Tomasz Haupt
Darp: Java-Based Data Analysis And Rapid Prototyping Environment For Distributed High Performance Computations, Erol Akarsu, Geoffrey C. Fox, Tomasz Haupt
Northeast Parallel Architecture Center
The integration of a compiled and interpreted HPF gives us an opportunity to design a powerful application development environment targeted for high performance parallel and distributed systems. This Web based system follows a three-tier model. The Java front-end holds proxy objects which can be manipulated with an interpreted Web client (a Java applet) interacting dynamically with compiled code through a tier-2 server. Although targeted for HPF back-end, the system’s architecture is independent of the back-end language, and can be extended to support other high performance languages.
Common Runtime Support For High Performance Languages, Geoffrey C. Fox
Common Runtime Support For High Performance Languages, Geoffrey C. Fox
Northeast Parallel Architecture Center
Widespread adoption of parallel computing depends on the availability of improved software environments. An essential component of these environments will be high-level languages. Several languages for exploiting data-parallelism (or task-parallelism) have been developed, or are under development. The stated goal of this project has been to provide a public domain infrastructure for runtime support of these high-level languages. The targeted languages include parallel versions of Fortran and C++, but our intention has been to provide uniform runtime support for many source languages.
Object Web (Java/Corba) Based Rti To Support Metacomputing M&S, Geoffrey C. Fox, Wojtek Furmanski, Hasan T. Ozdemir
Object Web (Java/Corba) Based Rti To Support Metacomputing M&S, Geoffrey C. Fox, Wojtek Furmanski, Hasan T. Ozdemir
Northeast Parallel Architecture Center
We present here our Pragmatic Object Web based approach to High Performance Modeling and Simulation and we describe the associated middleware software recently prototyped at NPAC: JWORB (Java Web Object Request Broker) which integrates HTTP and IIOP protocols, and Object Web RTI which implements DMSO RTI 1.3 on top of the JWORB based CORBA / Java software bus. We explain how JWORB and OW RTI are used to build WebHLA – an interactive FMS training environment and we outline our plan towards WebHLA based Virtual Prototyping Environments for Testing, Evaluation and Simulation Based Acquisition.
Techniques For Empirical Testing Of Parallel Random Number Generators, Paul D. Coddington, Sung-Hoon Ko
Techniques For Empirical Testing Of Parallel Random Number Generators, Paul D. Coddington, Sung-Hoon Ko
Northeast Parallel Architecture Center
Parallel computers are now commonly used for computational science and engineering, and many applications in these areas use random number generators. For some applications, such as large-scale Monte Carlo simulations, it is crucial that the random number generator have good randomness properties. Many programs are available for testing the quality of sequential random number generators, but very little work has been done on testing parallel random number generators. We present some techniques for empirical testing of random number generators on parallel computers, using tests based on computational science applications as examples. In particular, we focus on tests based on parallel …
A High Level Spmd Programming Model: Hpspmd And Its Java Language Binding, Guansong Zhang, Bryan Carpenter, Geoffrey C. Fox, Xinying Li
A High Level Spmd Programming Model: Hpspmd And Its Java Language Binding, Guansong Zhang, Bryan Carpenter, Geoffrey C. Fox, Xinying Li
Northeast Parallel Architecture Center
This report introduces a new language, HPJava, for parallel programming on message passing systems. The language provides a high level SPMD programming model. Through examples and performance results, the features of the new programming style, and its implementation, are illustrated.
Design, Implementation, And Evaluation Of Parallell Pipelined Stap On Parallel Computers, Alok Choudhary, Wei-Keng Liao, Donald Weiner, Pramod Varshney, Richard Linderman, Mark Linderman
Design, Implementation, And Evaluation Of Parallell Pipelined Stap On Parallel Computers, Alok Choudhary, Wei-Keng Liao, Donald Weiner, Pramod Varshney, Richard Linderman, Mark Linderman
Electrical Engineering and Computer Science - All Scholarship
Performance results are presented for the design and implementation of parallel pipelined space-time adaptive processing (STAP) algorithms on parallel computers. In particular, the issues involved in parallelization, our approach to parallelization, and performance results on an Intel Paragon are described. The process of developing software for such an application on parallel computers when latency and throughput are both considered together is discussed and tradeoffs considered with respect to inter and intratask communication and data redistribution are presented. The results show that not only scalable performance was achieved for individual component tasks of STAP but linear speedups were obtained for the …
A Multithreaded Message-Passing System For High Performance Distributed Computing Applications, Sung-Yong Park, Joohan Lee, Salim Hariri
A Multithreaded Message-Passing System For High Performance Distributed Computing Applications, Sung-Yong Park, Joohan Lee, Salim Hariri
Electrical Engineering and Computer Science - All Scholarship
High Performance Distributed Computing (HPDC) applications require low-latency and high-throughput communication services and HPDC applications have different Quality of Service (QOS) requirements (e.g., bandwidth requirement, flow/error control algorithms, etc.). The communication services provided by traditional message-passing systems are fixed and thus can not be changed to meet the requirements of different HPDC applications. NYNET (ATM wide area network testbed in New York state) Communication System (NCS) is a multithreaded message-passing system developed at Syracuse University that provides high-performance and flexible communication services. In this paper, we overview the general architecture of NCS and present how NCS communication services are implemented. …
A Problem Solving Environment For Network Computing, Salim Hariri, Haluk Topcuoglu, Wojtek Furmanski, Dongmin Kim, Yoonhee Kim
A Problem Solving Environment For Network Computing, Salim Hariri, Haluk Topcuoglu, Wojtek Furmanski, Dongmin Kim, Yoonhee Kim
Electrical Engineering and Computer Science - All Scholarship
The current advances in high-speed networks and WWW technologies have made network computing a cost-effective high performance computing environment. New software development models and problem solving environments must be developed to utilize the network computing environment efficiently. In this paper we present Virtual Distributed Computing Environment (VDCE), which provides a problem solving environment for high-performance distributed computing over wide-area networks. VDCE enables scientists to develop distributed applications without knowing the detailed architecture of the underlying resources. VDCE provides well-defined library functions that relieve end users from tedious task implementations and it supports software reusability. The VDCE software architecture consists of …
Automatic Granularity Control For Load Balancing Of Concurrent Particle Simulations, Marc Rieffel, Stephen Taylor, Jerrell Watts
Automatic Granularity Control For Load Balancing Of Concurrent Particle Simulations, Marc Rieffel, Stephen Taylor, Jerrell Watts
Electrical Engineering and Computer Science - All Scholarship
This paper demonstrates the use of automatic granularity control as part of dynamic load balancing for irregular, particle-based simulations. Performance optimization techniques are considered in the context of a concurrent Direct Simulation Monte Carlo method used to study the rarefied gas flow inside three-dimensional plasma reactors. Several computational techniques are used to reduce the overall time to deliver realistic threedimensional results. The effectiveness of dynamic load balancing and granularity control are presented for large-scale simulations on distributed-memory multicomputers.
Performance Enhancement Using Intra-Server Caching In A Continuous Media Server, Chutimet Srinilta, Alok Choudhary
Performance Enhancement Using Intra-Server Caching In A Continuous Media Server, Chutimet Srinilta, Alok Choudhary
Electrical Engineering and Computer Science - All Scholarship
Continuity of stream playback is the crucial constraint in designing a continuous media server. From a distributed memory architectural model developed earlier, we found that there were many points where the stream capacity of the server could be improved. The stream capacity was usually limited by the storage bottlenecks. Serving streams from memory cache eliminates disk accesses and data transfers between nodes which, in turn, helps relieve those bottlenecks. However, the capacity of the server ultimately depends on client access pattern. Client request assignment has an impact on cache hit ratio as well as workload distribution. It is also the …