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  • Communications and Radar  (4)
  • Numerical Analysis  (2)
  • Chemistry
  • Computer Systems
  • TEM
  • 1995-1999  (6)
  • 1925-1929
  • 1998  (6)
  • 1
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    Overview of the Preliminary Design of the Optical Communication Demonstration and High-Rate Link Facility (1998)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Keywords: Communications and Radar
    Type: Free-Space Optoelectronics; San Jose, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Lasercom Test and Evaluation Station (LTES) Development: an update (1998)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Pre-launch integrated system characterization of a lasercom terminal's (LCT's) communications and acquisition/tracking subsystems can provide a quantitative evaluation of the terminal and afford a better rigorous assessment of the benefits of any demonstration.
    Keywords: Communications and Radar
    Type: Free-Space Laser Communication Technologies; San Jose, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Results of the STRV-2 Lasercom Terminal Evaluation Tests (1998)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: The STRV-2 lasercom terminal (LCT) was designed and developed by AstroTerra Corporation of San Diego, California, under funding from the Ballistic Missile Defense Organization (BMDO). Scheduled for launch in late 1998 it will be used to demonstrate, for the first time, high data rate bi-directional satellite-to-ground optical communications.
    Keywords: Communications and Radar
    Type: Free-Space Laser Communication Technologies X; San Jose, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Using Multithreading for the Automatic Load Balancing of 2D Adaptive Finite Element Meshes (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: In this paper, we present a multi-threaded approach for the automatic load balancing of adaptive finite element (FE) meshes. The platform of our choice is the EARTH multi-threaded system which offers sufficient capabilities to tackle this problem. We implement the question phase of FE applications on triangular meshes, and exploit the EARTH token mechanism to automatically balance the resulting irregular and highly nonuniform workload. We discuss the results of our experiments on EARTH-SP2, an implementation of EARTH on the IBM SP2, with different load balancing strategies that are built into the runtime system.
    Keywords: Numerical Analysis
    Type: 5th International Symposium on Solving Irregularly Structured Problems in Parallel; Aug 09, 1998 - Aug 11, 1998; Berkley, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    PLUM: Parallel Load Balancing for Adaptive Unstructured Meshes (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Mesh adaption is a powerful tool for efficient unstructured-grid computations but causes load imbalance among processors on a parallel machine. We present a novel method called PLUM to dynamically balance the processor workloads with a global view. This paper presents the implementation and integration of all major components within our dynamic load balancing strategy for adaptive grid calculations. Mesh adaption, repartitioning, processor assignment, and remapping are critical components of the framework that must be accomplished rapidly and efficiently so as not to cause a significant overhead to the numerical simulation. A data redistribution model is also presented that predicts the remapping cost on the SP2. This model is required to determine whether the gain from a balanced workload distribution offsets the cost of data movement. Results presented in this paper demonstrate that PLUM is an effective dynamic load balancing strategy which remains viable on a large number of processors.
    Keywords: Numerical Analysis
    Type: SIAM Annual Meeting; Jul 13, 1998 - Jul 17, 1998; Toronto; Canada
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Dynamic Load Balancing for Adaptive Meshes using Symmetric Broadcast Networks (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Many scientific applications involve grids that lack a uniform underlying structure. These applications are often dynamic in the sense that the grid structure significantly changes between successive phases of execution. In parallel computing environments, mesh adaptation of grids through selective refinement/coarsening has proven to be an effective approach. However, achieving load balance while minimizing inter-processor communication and redistribution costs is a difficult problem. Traditional dynamic load balancers are mostly inadequate because they lack a global view across processors. In this paper, we compare a novel load balancer that utilizes symmetric broadcast networks (SBN) to a successful global load balancing environment (PLUM) created to handle adaptive unstructured applications. Our experimental results on the IBM SP2 demonstrate that performance of the proposed SBN load balancer is comparable to results achieved under PLUM.
    Keywords: Communications and Radar
    Type: 12th ACM International Conference on Supercomputing; Jul 13, 1998 - Jul 17, 1998; Melbourne; Australia
    Format: text
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    NASA TECHNICAL REPORTS
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