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• W2108634150 abstract "This work revisits existing algorithms for the QR factorization of rectangular matrices composed of p × q tiles, where p ≥ q. Within this framework, we study the critical paths and performance of algorithms such as Sameh-Kuck, Fibonacci, Greedy, and those found within PLASMA. Although neither Fibonacci nor Greedy is optimal, both are shown to be asymptotically optimal for all matrices of size p = q2f(q), where f is any function such that lim+∞ f = 0. This novel and important complexity result applies to all matrices where p and q are proportional, p = λq, with λ ≥ 1, thereby encompassing many important situations in practice (least squares). We provide an extensive set of experiments that show the superiority of the new algorithms for tall matrices." @default.
• W2108634150 created "2016-06-24" @default.
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• W2108634150 date "2011-11-12" @default.
• W2108634150 modified "2023-10-17" @default.
• W2108634150 title "Tiled QR factorization algorithms" @default.
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• W2108634150 doi "https://doi.org/10.1145/2063384.2063393" @default.
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