Computer Science Technical Reports
CS at VT

Performance Modeling and Analysis of a Massively Parallel DIRECT— Part 2

He, Jian and Verstak, Alex and Sosonkina, M. and Watson, L. T. (2007) Performance Modeling and Analysis of a Massively Parallel DIRECT— Part 2. Technical Report TR-07-02, Computer Science, Virginia Tech.

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Modeling and analysis techniques are used to investigate the performance of a massively parallel version of DIRECT, a global search algorithm widely used in multidisciplinary design optimization applications. Several highdimensional benchmark functions and real world problems are used to test the design effectiveness under various problem structures. In this second part of a twopart work, theoretical and experimental results are compared for two parallel clusters with different system scale and network connectivity. The first part studied performance sensitivity to important parameters for problem configurations and parallel schemes, using performance metrics such as memory usage, load balancing, and parallel efficiency. Here linear regression models are used to characterize two major overhead sources—interprocessor communication and processor idleness—and also applied to the isoefficiency functions in scalability analysis. For a variety of highdimensional problems and large scale systems, the massively parallel design has achieved reasonable performance. The results of the performance study provide guidance for efficient problem and scheme configuration. More importantly, the design considerations and analysis techniques generalize to the transformation of other global search algorithms into effective large scale parallel optimization tools.

Item Type:Departmental Technical Report
Keywords:DIRECT, global search algorithms, isoefficiency, load balancing, parallel optimization, performance modeling, scalability analysis
Subjects:Computer Science > Parallel Computation
ID Code:938
Deposited By:Administrator, Eprints
Deposited On:01 January 2007