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Scaling, reordering, and diagonal pivoting in ILU preconditionings. (English) Zbl 1183.65044

Summary: We consider several techniques for construction of general-purpose ILU preconditioning. We also provide some new theoretical results supporting the proposed preconditioning strategy. For the preprocession stage we consider row/column norm-equalizing two-side scaling, as well as diagonal dominance improvement by unsymmetric permutations. Within the incomplete LU-factorization, we use a variant of the inverse norm-reducing complete diagonal pivoting. Numerical results are given for 67 test problems chosen from publicly available matrix sets.

MSC:

65F35 Numerical computation of matrix norms, conditioning, scaling
65F10 Iterative numerical methods for linear systems

Software:

ILU++; SparseMatrix
Full Text: DOI

References:

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