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LU factorization with panel rank revealing pivoting and its communication avoiding version

Amal Khabou 1 James Demmel 2 Laura Grigori 3 Ming Gu 2
3 GRAND-LARGE - Global parallel and distributed computing
CNRS - Centre National de la Recherche Scientifique : UMR8623, Inria Saclay - Ile de France, UP11 - Université Paris-Sud - Paris 11, LIFL - Laboratoire d'Informatique Fondamentale de Lille, LRI - Laboratoire de Recherche en Informatique
Abstract : We present the LU decomposition with panel rank revealing pivoting (LU_PRRP), an LU factorization algorithm based on strong rank revealing QR panel factorization. LU_PRRP is more stable than Gaussian elimination with partial pivoting (GEPP). Our extensive numerical experiments show that the new factorization scheme is as numerically stable as GEPP in practice, but it is more resistant to pathological cases and easily solves the Wilkinson matrix and the Foster matrix. We also present CALU_PRRP, a communication avoiding version of LU_PRRP that minimizes communication. CALU_PRRP is based on tournament pivoting, with the selection of the pivots at each step of the tournament being performed via strong rank revealing QR factorization. CALU_PRRP is more stable than CALU, the communication avoiding version of GEPP. CALU_PRRP is also more stable in practice and is resistant to pathological cases on which GEPP and CALU fail.
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https://hal.inria.fr/hal-00723564
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Submitted on : Friday, August 10, 2012 - 6:08:51 PM
Last modification on : Thursday, July 8, 2021 - 3:47:56 AM
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  • HAL Id : hal-00723564, version 1
  • ARXIV : 1208.2451

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Amal Khabou, James Demmel, Laura Grigori, Ming Gu. LU factorization with panel rank revealing pivoting and its communication avoiding version. [Research Report] RR-7867, INRIA. 2012. ⟨hal-00723564⟩

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