Performance of H-LU Preconditioning for Sparse Matrices
Lars Grasedyck, Wolfgang Hackbusch,and Ronald Kriemann
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Submission date: 08. Oct. 2008 (revised version: June 2009)
published in: Computational methods in applied mathematics, 8 (2008) 4, p. 336-349
DOI number (of the published article): 10.2478/cmam-2008-0024
MSC-Numbers: 65F05, 65F30, 65F50, 65N55
Keywords and phrases: hierarchical matrices, black-box clustering, preconditioning, lu, direct solver, iterative solver, performance
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In this paper we review the technique of hierarchical matrices and put it into the context of black-box solvers for large linear systems. Numerical examples for several classes of problems from medium to large scale illustrate the applicability and efficiency of this technique. We compare the results with those of several direct solvers (which typically scale quadratically in the matrix size) as well as an iterative solver (an algebraic multigrid method) which scales linearly (if it converges in O(1) steps).