## DGGHR3

swMATH ID: | 13050 |

Software Authors: | Karlsson, Lars; Tisseur, Françoise |

Description: | Algorithms for Hessenberg-triangular reduction of Fiedler linearization of matrix polynomials. Small- to medium-sized polynomial eigenvalue problems can be solved by linearizing the matrix polynomial and solving the resulting generalized eigenvalue problem using the QZ algorithm. The QZ algorithm, in turn, requires an initial reduction of a matrix pair to Hessenberg-triangular (HT) form. In this paper, we discuss the design and evaluation of high-performance parallel algorithms and software for HT reduction of a specific linearization of matrix polynomials of arbitrary degree. The proposed algorithm exploits the sparsity structure of the linearization to reduce the number of operations and improve the cache reuse compared to existing algorithms for unstructured inputs. Experiments on both a workstation and a high-performance computing system demonstrate that our structure-exploiting parallel implementation can outperform both the general LAPACK routine DGGHRD and the prototype implementation DGGHR3 of a general blocked algorithm |

Homepage: | http://epubs.siam.org/doi/10.1137/140970458 |

Keywords: | Hessenberg-triangular reduction; polynomial eigenvalue problem; linearization; blocked algorithm; parallelization |

Related Software: | DGGHRD; NLEVP; NLEIGS; Chebfun; RKToolbox; StratiGraph; Matlab; quadeig; LAPACK |

Cited in: | 7 Documents |

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### Cited by 12 Authors

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top 5

### Cited in 7 Serials

### Cited in 5 Fields

6 | Linear and multilinear algebra; matrix theory (15-XX) |

6 | Numerical analysis (65-XX) |

2 | Operator theory (47-XX) |

1 | Approximations and expansions (41-XX) |

1 | Computer science (68-XX) |