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  • 1
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    Design and Performance of a Heterogeneous Grid Partitioner (2006)
    Springer
    Details
    Publication Date: 2006-05-24
    Print ISSN: 0178-4617
    Electronic ISSN: 1432-0541
    Topics: Computer Science , Mathematics
    Published by Springer
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    PAPER CURRENT
  • 2
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    The treewidth of line graphs (2018)
    Elsevier
    Details
    Publication Date: 2018-09-01
    Print ISSN: 0095-8956
    Electronic ISSN: 1096-0902
    Topics: Mathematics
    Published by Elsevier
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    PAPER CURRENT
  • 3
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    Computational modelling of lung injury: is there potential for benefit? (2011)
    The Royal Society
    Details
    Publication Date: 2011-01-27
    Description: State-of-the-art medical care of the victims of current conflicts is generating large quantities of quality clinical data as a by-product. Observational research based on these data is beginning to have a profound influence on the clinical management of both military and civilian trauma patients. Computational modelling based on these datasets may offer the ability to investigate clinical treatment strategies that are practically, ethically or scientifically impossible to investigate on the front line. This article reviews the potential of this novel technology to aid development of treatment for blast lung and other unresolved medical scenarios.
    Print ISSN: 0962-8436
    Electronic ISSN: 1471-2970
    Topics: Biology
    Published by The Royal Society
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    PAPER CURRENT
  • 4
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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
  • 5
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    A Latency-Tolerant Partitioner for Distributed Computing on the Information Power Grid (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA's Information Power Grid (IPG) is an infrastructure designed to harness the power of graphically distributed computers, databases, and human expertise, in order to solve large-scale realistic computational problems. This type of a meta-computing environment is necessary to present a unified virtual machine to application developers that hides the intricacies of a highly heterogeneous environment and yet maintains adequate security. In this paper, we present a novel partitioning scheme. called MinEX, that dynamically balances processor workloads while minimizing data movement and runtime communication, for applications that are executed in a parallel distributed fashion on the IPG. We also analyze the conditions that are required for the IPG to be an effective tool for such distributed computations. Our results show that MinEX is a viable load balancer provided the nodes of the IPG are connected by a high-speed asynchronous interconnection network.
    Keywords: Computer Programming and Software
    Type: IPDPS Conference; Apr 23, 2001 - Apr 27, 2001; San Francisco, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Latency Hiding in Dynamic Partitioning and Load Balancing of Grid Computing Applications (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Information Power Grid (IPG) concept developed by NASA is aimed to provide a metacomputing platform for large-scale distributed computations, by hiding the intricacies of highly heterogeneous environment and yet maintaining adequate security. In this paper, we propose a latency-tolerant partitioning scheme that dynamically balances processor workloads on the.IPG, and minimizes data movement and runtime communication. By simulating an unsteady adaptive mesh application on a wide area network, we study the performance of our load balancer under the Globus environment. The number of IPG nodes, the number of processors per node, and the interconnected speeds are parameterized to derive conditions under which the IPG would be suitable for parallel distributed processing of such applications. Experimental results demonstrate that effective solution are achieved when the IPG nodes are connected by a high-speed asynchronous interconnection network.
    Keywords: Computer Programming and Software
    Type: CCGrid Conference; May 15, 2001 - May 18, 2001; Brisbane; Australia
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Adaptive Load-Balancing Algorithms using Symmetric Broadcast Networks (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: In a distributed computing environment, it is important to ensure that the processor workloads are adequately balanced, Among numerous load-balancing algorithms, a unique approach due to Das and Prasad defines a symmetric broadcast network (SBN) that provides a robust communication pattern among the processors in a topology-independent manner. In this paper, we propose and analyze three efficient SBN-based dynamic load-balancing algorithms, and implement them on an SGI Origin2000. A thorough experimental study with Poisson distributed synthetic loads demonstrates that our algorithms are effective in balancing system load. By optimizing completion time and idle time, the proposed algorithms are shown to compare favorably with several existing approaches.
    Keywords: Numerical Analysis
    Format: application/pdf
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  • 8
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    Performance of a Heterogeneous Grid Partitioner for N-body Applications (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: An important characteristic of distributed grids is that they allow geographically separated multicomputers to be tied together in a transparent virtual environment to solve large-scale computational problems. However, many of these applications require effective runtime load balancing for the resulting solutions to be viable. Recently, we developed a latency tolerant partitioner, called MinEX, specifically for use in distributed grid environments. This paper compares the performance of MinEX to that of METIS, a popular multilevel family of partitioners, using simulated heterogeneous grid configurations. A solver for the classical N-body problem is implemented to provide a framework for the comparisons. Experimental results show that MinEX provides superior quality partitions while being competitive to METIS in speed of execution.
    Keywords: Computer Programming and Software
    Type: 32nd International Conference on Parallel Processing (ICPP); Unknown; Unknown
    Format: application/pdf
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  • 9
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    Parallel Processing of Adaptive Meshes with Load Balancing (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: Many scientific applications involve grids that lack a uniform underlying structure. These applications are often also dynamic in nature in that the grid structure significantly changes between successive phases of execution. In parallel computing environments, mesh adaptation of unstructured grids through selective refinement/coarsening has proven to be an effective approach. However, achieving load balance while minimizing interprocessor communication and redistribution costs is a difficult problem. Traditional dynamic load balancers are mostly inadequate because they lack a global view of system loads across processors. In this paper, we propose a novel and general-purpose load balancer that utilizes symmetric broadcast networks (SBN) as the underlying communication topology, and compare its performance with a successful global load balancing environment, called PLUM, specifically created to handle adaptive unstructured applications. Our experimental results on an IBM SP2 demonstrate that the SBN-based load balancer achieves lower redistribution costs than that under PLUM by overlapping processing and data migration.
    Keywords: Computer Systems
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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