An Out-of-Core Eigen-Solver with OpenMP Parallel Scheme for Large Spare Damped System

Shen-Haw Ju, H. H. Hsu

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)

摘要

An out-of-core block Lanczos method with the OpenMP parallel scheme was developed to solve large spare damped eigenproblems. The symmetric generalized eigenproblem is first solved using the block Lanczos method with the preconditioned conjugate gradient (PCG) method, and the condensed damped eigenproblem is then solved to obtain the complex eigenvalues. Since the PCG solvers and out-of-core schemes are used, a large-scale eigenproblem can be solved using minimal computer memory. The out-of-core arrays only need to be read once in each Lanczos iteration, so the proposed method requires little extra CPU time. In addition, the second-level OpenMP parallel computation in the PCG solver is suggested to avoid using a large block size that often increases the number of iterations needed to achieve convergence.

原文English
文章編號1950038
期刊International Journal of Computational Methods
16
發行號7
DOIs
出版狀態Published - 2019 十一月 1

All Science Journal Classification (ASJC) codes

  • Computer Science (miscellaneous)
  • Computational Mathematics

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