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- W1543451377 abstract "Several ordering techniques for block based preconditioning are presented.The XPABLO algorithm as an extension of the original PABLO and TPABLO algorithms incorporates as a preprocessing step a nonsymmetric permutation combined with row and column scalings to obtain a large diagonal. A more general parametrization can be implemented in XPABLO while keeping the original time complexity of PABLO. It is shown that a block Gauss-Seidel preconditioner can be implemented to have the same execution time as the corresponding block Jacobi preconditioner. Experiments are presented showing that for certain classes of matrices, the block Gauss-Seidel preconditioner used with the system permuted with the XPABLO algorithm can outperform the best ILUTP preconditioners in a large set of experiments.The new OBGP algorithm extends a given nonoverlapping block ordering to an overlapping ordering to be used for algebraic Schwarz preconditioners. It is shown by experiments that using a multiplicative Schwarz preconditioner based on the extended ordering instead of using a block Gauss--Seidel preconditioner based on the original ordering can result in faster convergence." @default.
- W1543451377 created "2016-06-24" @default.
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- W1543451377 date "2018-01-22" @default.
- W1543451377 modified "2023-09-27" @default.
- W1543451377 title "Overlapping and Nonoverlapping Orderings for Preconditioning" @default.
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