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  • 1
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    Automated Generation of Message-Passing Programs: An Evaluation of CAPTools using NAS Benchmarks (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Scientists at NASA Ames Research Center have been developing computational aeroscience applications on highly parallel architectures over the past ten years. During the same time period, a steady transition of hardware and system software also occurred, forcing us to expand great efforts into migrating and receding our applications. As applications and machine architectures continue to become increasingly complex, the cost and time required for this process will become prohibitive. Various attempts to exploit software tools to assist and automate the parallelization process have not produced favorable results. In this paper, we evaluate an interactive parallelization tool, CAPTools, for parallelizing serial versions of the NAB Parallel Benchmarks. Finally, we compare the performance of the resulting CAPTools generated code to the hand-coded benchmarks on the Origin 2000 and IBM SP2. Based on these results, a discussion on the feasibility of automated parallelization of aerospace applications is presented along with suggestions for future work.
    Keywords: Computer Systems
    Type: ACM International Conference on Supercomputing; Jul 13, 1998 - Jul 17, 1998; Melbourne; Australia
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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
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    NASA TECHNICAL REPORTS
  • 3
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    Tools to Rapidly and Effectively Parallelise Serial FORTRAN Codes Using Either MPI or OpenMP (2001)
    In:  Other Sources
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    Publication Date: 2019-07-17
    Description: Significant progress has been made in hardware and software technologies, as a result the use of efficient standard message passing communication calls in parallel application codes has greatly assisted in reducing execution times. In addition, the introduction of OpenMP, an industrial standard for shared memory programming with directives addresses the issue of portability and also provides a means to deliver respectable performance. In general however, the manual parallelisation of a user's application code using either message passing or directives is still a very costly and error-prone process.
    Keywords: Computer Programming and Software
    Type: SGI Global Developer Conference; Mar 19, 2001 - Mar 22, 2001; Burlingham, CA; United States
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    NASA TECHNICAL REPORTS
  • 4
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    Comparing the OpenMP, MPI, and Hybrid Programming Paradigm on an SMP Cluster (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Clusters of SMP (Symmetric Multi-Processors) nodes provide support for a wide range of parallel programming paradigms. The shared address space within each node is suitable for OpenMP parallelization. Message passing can be employed within and across the nodes of a cluster. Multiple levels of parallelism can be achieved by combining message passing and OpenMP parallelization. Which programming paradigm is the best will depend on the nature of the given problem, the hardware components of the cluster, the network, and the available software. In this study we compare the performance of different implementations of the same CFD benchmark application, using the same numerical algorithm but employing different programming paradigms.
    Keywords: Computer Programming and Software
    Type: European Workshop on OpenMP and Applications 2003; Sep 22, 2003 - Sep 26, 2003; Aachen; Germany
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    NASA TECHNICAL REPORTS
  • 5
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    Automatic Relative Debugging of OpenMP Programs (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In this work we show how automatic relative debugging can be used to find differences in computation between a serial program and an OpenMP parallel version of that program. Backtracking and re-execution are used to determine the first OpenMP parallel region that produces a difference in computation that may lead to an incorrect value the user has indicated. Tool-parallelized programs are addressed by utilizing static analysis and directive information from the parallelization tool. Manually-parallelized programs are addressed as well by performing data dependence and directive analysis.
    Keywords: Computer Programming and Software
    Type: European Workshop on OpenMP; Sep 22, 2003 - Sep 26, 2003; Aachen; Germany
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    NASA TECHNICAL REPORTS
  • 6
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    Support of Multidimensional Parallelism in the OpenMP Programming Model (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: OpenMP is the current standard for shared-memory programming. While providing ease of parallel programming, the OpenMP programming model also has limitations which often effect the scalability of applications. Examples for these limitations are work distribution and point-to-point synchronization among threads. We propose extensions to the OpenMP programming model which allow the user to easily distribute the work in multiple dimensions and synchronize the workflow among the threads. The proposed extensions include four new constructs and the associated runtime library. They do not require changes to the source code and can be implemented based on the existing OpenMP standard. We illustrate the concept in a prototype translator and test with benchmark codes and a cloud modeling code.
    Keywords: Computer Programming and Software
    Type: International Workshop on OpenMP: Experiences and Implementation; Oct 01, 2003; Tokyo; Japan
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  • 7
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    Implementation of NAS Parallel Benchmarks in Java (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A number of features make Java an attractive but a debatable choice for High Performance Computing (HPC). In order to gauge the applicability of Java to the Computational Fluid Dynamics (CFD) we have implemented NAS Parallel Benchmarks in Java. The performance and scalability of the benchmarks point out the areas where improvement in Java compiler technology and in Java thread implementation would move Java closer to Fortran in the competition for CFD applications.
    Keywords: Computer Systems
    Type: Java Grande; Jun 03, 2000 - Jun 04, 2000; San Francisco, CA; United States
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    NASA TECHNICAL REPORTS
  • 8
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    Automatic Generation of Directive-Based Parallel Programs for Shared Memory Parallel Systems (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The shared-memory programming model is a very effective way to achieve parallelism on shared memory parallel computers. As great progress was made in hardware and software technologies, performance of parallel programs with compiler directives has demonstrated large improvement. The introduction of OpenMP directives, the industrial standard for shared-memory programming, has minimized the issue of portability. Due to its ease of programming and its good performance, the technique has become very popular. In this study, we have extended CAPTools, a computer-aided parallelization toolkit, to automatically generate directive-based, OpenMP, parallel programs. We outline techniques used in the implementation of the tool and present test results on the NAS parallel benchmarks and ARC3D, a CFD application. This work demonstrates the great potential of using computer-aided tools to quickly port parallel programs and also achieve good performance.
    Keywords: Computer Systems
    Type: ICS; May 01, 2000; Unknown
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    NASA TECHNICAL REPORTS
  • 9
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    Implementation of BT, SP, LU, and FT of NAS Parallel Benchmarks in Java (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A number of Java features make it an attractive but a debatable choice for High Performance Computing. We have implemented benchmarks working on single structured grid BT,SP,LU and FT in Java. The performance and scalability of the Java code shows that a significant improvement in Java compiler technology and in Java thread implementation are necessary for Java to compete with Fortran in HPC applications.
    Keywords: Computer Programming and Software
    Type: Parallel and Distributed Processing; May 01, 2000 - May 05, 2000; Cancun; Mexico
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    NASA TECHNICAL REPORTS
  • 10
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    Automatic Multilevel Parallelization Using OpenMP (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: In this paper we describe the extension of the CAPO parallelization support tool to support multilevel parallelism based on OpenMP directives. CAPO generates OpenMP directives with extensions supported by the NanosCompiler to allow for directive nesting and definition of thread groups. We report first results for several benchmark codes and one full application that have been parallelized using our system.
    Keywords: Computer Systems
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    NASA TECHNICAL REPORTS
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