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  • 1
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    MPI, HPF or OpenMP: A Study with the NAS Benchmarks (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Porting applications to new high performance parallel and distributed platforms is a challenging task. Writing parallel code by hand is time consuming and costly, but this task can be simplified by high level languages and would even better be automated by parallelizing tools and compilers. The definition of HPF (High Performance Fortran, based on data parallel model) and OpenMP (based on shared memory parallel model) standards has offered great opportunity in this respect. Both provide simple and clear interfaces to language like FORTRAN and simplify many tedious tasks encountered in writing message passing programs. In our study, we implemented the parallel versions of the NAS Benchmarks with HPF and OpenMP directives. Comparison of their performance with the MPI implementation and pros and cons of different approaches will be discussed along with experience of using computer-aided tools to help parallelize these benchmarks. Based on the study, potentials of applying some of the techniques to realistic aerospace applications will be presented.
    Keywords: Computer Systems
    Type: Workshop on Performance Evaluation with Realistic Applications; Jan 25, 1999; San Jose, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A Comparison of Automatic Parallelization Tools/Compilers on the SGI Origin 2000 Using the NAS Benchmarks (1998)
    In:  Other Sources
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    Publication Date: 2019-07-18
    Description: Porting applications to new high performance parallel and distributed computing platforms is a challenging task. Since writing parallel code by hand is extremely time consuming and costly, porting codes would ideally be automated by using some parallelization tools and compilers. In this paper, we compare the performance of the hand written NAB Parallel Benchmarks against three parallel versions generated with the help of tools and compilers: 1) CAPTools: an interactive computer aided parallelization too] that generates message passing code, 2) the Portland Group's HPF compiler and 3) using compiler directives with the native FORTAN77 compiler on the SGI Origin2000.
    Keywords: Computer Systems
    Type: ACM Sigmetrics Symposium on Parallel and Distributed Tools; Aug 03, 1998 - Aug 04, 1998; Welches, OR; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    An Evaluation of Alternative Designs for a Grid Information Service (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Globus information service wasn't working well. There were many updates of data from Globus daemons which saturated the single server and users couldn't retrieve information. We created a second server for NASA and Alliance. Things were great on that server, but a bit slow on the other server. We needed to know exactly how the information service was being used. What were the best servers and configurations? This viewgraph presentation gives an overview of the evaluation of alternative designs for a Grid Information Service. Details are given on the workload characterization, methodology used, and the performance evaluation.
    Keywords: Computer Systems
    Type: 9th IEEE Symposium on High Performance Distributed Computing; Jan 01, 2000; United States
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    NASA TECHNICAL REPORTS
  • 4
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    Performance Modeling and Measurement of Parallelized Code for Distributed Shared Memory Multiprocessors (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: This paper presents a model to evaluate the performance and overhead of parallelizing sequential code using compiler directives for multiprocessing on distributed shared memory (DSM) systems. With increasing popularity of shared address space architectures, it is essential to understand their performance impact on programs that benefit from shared memory multiprocessing. We present a simple model to characterize the performance of programs that are parallelized using compiler directives for shared memory multiprocessing. We parallelized the sequential implementation of NAS benchmarks using native Fortran77 compiler directives for an Origin2000, which is a DSM system based on a cache-coherent Non Uniform Memory Access (ccNUMA) architecture. We report measurement based performance of these parallelized benchmarks from four perspectives: efficacy of parallelization process; scalability; parallelization overhead; and comparison with hand-parallelized and -optimized version of the same benchmarks. Our results indicate that sequential programs can conveniently be parallelized for DSM systems using compiler directives but realizing performance gains as predicted by the performance model depends primarily on minimizing architecture-specific data locality overhead.
    Keywords: Computer Systems
    Type: NAS-98-012
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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