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  • 11
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    Experiences in Data-Parallel Programming (1997)
    Hindawi
    Details
    Publication Date: 1997-01-01
    Description: To efficiently parallelize a scientific application with a data-parallel compiler requires certain structural properties in the source program, and conversely, the absence of others. A recent parallelization effort of ours reinforced this observation and motivated this correspondence. Specifically, we have transformed a Fortran 77 version of GROMOS, a popular dusty-deck program for molecular dynamics, into Fortran D, a data-parallel dialect of Fortran. During this transformation we have encountered a number of difficulties that probably are neither limited to this particular application nor do they seem likely to be addressed by improved compiler technology in the near future. Our experience with GROMOS suggests a number of points to keep in mind when developing software that may at some time in its life cycle be parallelized with a data-parallel compiler. This note presents some guidelines for engineering data-parallel applications that are compatible with Fortran D or High Performance Fortran compilers.
    Print ISSN: 1058-9244
    Electronic ISSN: 1875-919X
    Topics: Computer Science , Media Resources and Communication Sciences, Journalism
    Published by Hindawi
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    PAPER CURRENT
  • 12
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    Automatic Data Distribution for Composite Grid Applications (1997)
    Hindawi
    Details
    Publication Date: 1997-01-01
    Description: Problem topology is the key to efficient parallelization support for partially regular applications. Specifically, problem topology provides the information necessary for automatic data distribution and regular application optimization of a large class of partially regular applications. Problem topology is the connectivity of the problem. This research focuses on composite grid applications and strives to take advantage of their partial regularity in the parallelization and compilation process. Composite grid problems arise in important application areas, e.g., reactor and aerodynamic simulation. Related physical phenomena are inherently parallel and their simulations are computationally intensive. We present algorithms that automatically determine data distributions for composite grid problems. Our algorithm's alignment and distribution specifications may be used as input to a High Performance Fortran program to apply the mapping for execution of the simulation code. These algorithms eliminate the need for user-specified data distribution for this large class of complex topology problems. We test the algorithms using a number of topological descriptions from aerodynamic and water-cooled nuclear reactor simulations. Speedup-bound predictions with and without communication, based on the automatically generated distributions, indicate that significant speedups are possible using these algorithms.
    Print ISSN: 1058-9244
    Electronic ISSN: 1875-919X
    Topics: Computer Science , Media Resources and Communication Sciences, Journalism
    Published by Hindawi
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  • 13
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    Deployment of a cloud pipeline for real‐time visual inspection using fast streaming high‐definition images (2020)
    Wiley
    Details
    Publication Date: 2020-03-11
    Print ISSN: 0038-0644
    Electronic ISSN: 1097-024X
    Topics: Computer Science
    Published by Wiley
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  • 14
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    Profitability computations on program flow graphs (1976)
    Elsevier
    Details
    Publication Date: 1976-01-01
    Print ISSN: 0898-1221
    Electronic ISSN: 1873-7668
    Topics: Mathematics
    Published by Elsevier
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  • 15
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    Remote Sensing of Landuse Changes and Implications for Landuse Policy (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This final report describes grant activities under which students were to study landuse changes by comparing planning and zoning documents using remote sensed data data analyzed and interpreted in the laboratory. Students were recruited through mathematics, political science and engineering classes an clubs. Work protocols were then organized for research on the county's growth patterns over the last three decades. Students and investigators made planes to identify specific scenes in Landsat and other data which would satisfy the research parameters. Finally, statistical and imaging software was identified and some was acquired.
    Keywords: Earth Resources and Remote Sensing
    Type: NASA-CR-202651 , NAS 1.26:202651
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 16
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    The ParaScope parallel programming environment (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The ParaScope parallel programming environment, developed to support scientific programming of shared-memory multiprocessors, includes a collection of tools that use global program analysis to help users develop and debug parallel programs. This paper focuses on ParaScope's compilation system, its parallel program editor, and its parallel debugging system. The compilation system extends the traditional single-procedure compiler by providing a mechanism for managing the compilation of complete programs. Thus, ParaScope can support both traditional single-procedure optimization and optimization across procedure boundaries. The ParaScope editor brings both compiler analysis and user expertise to bear on program parallelization. It assists the knowledgeable user by displaying and managing analysis and by providing a variety of interactive program transformations that are effective in exposing parallelism. The debugging system detects and reports timing-dependent errors, called data races, in execution of parallel programs. The system combines static analysis, program instrumentation, and run-time reporting to provide a mechanical system for isolating errors in parallel program executions. Finally, we describe a new project to extend ParaScope to support programming in FORTRAN D, a machine-independent parallel programming language intended for use with both distributed-memory and shared-memory parallel computers.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: IEEE, Proceedings (ISSN 0018-9219); 81; 2; p. 244-263.
    Format: text
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    NASA TECHNICAL REPORTS
  • 17
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    Compiler analysis for irregular problems in FORTRAN D (1992)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: We developed a dataflow framework which provides a basis for rigorously defining strategies to make use of runtime preprocessing methods for distributed memory multiprocessors. In many programs, several loops access the same off-processor memory locations. Our runtime support gives us a mechanism for tracking and reusing copies of off-processor data. A key aspect of our compiler analysis strategy is to determine when it is safe to reuse copies of off-processor data. Another crucial function of the compiler analysis is to identify situations which allow runtime preprocessing overheads to be amortized. This dataflow analysis will make it possible to effectively use the results of interprocedural analysis in our efforts to reduce interprocessor communication and the need for runtime preprocessing.
    Keywords: MATHEMATICAL AND COMPUTER SCIENCES (GENERAL)
    Type: NASA-CR-189664 , ICASE-92-22 , NAS 1.26:189664 , AD-A253885 , Workshop on Languages and Compilers for Parallel Computing; Aug 01, 1992; New Haven, CT; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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