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• W1998492046 abstract "QR and LU factorizations for dense matrices are important linear algebra computations that are widely used in scientific applications. To efficiently perform these computations on modern computers, the factorization algorithms need to be blocked when operating on large matrices to effectively exploit the deep cache hierarchy prevalent in today's computer memory systems. Because both QR (based on Householder transformations) and LU factorization algorithms contain complex loop structures, few compilers can fully automate the blocking of these algorithms. Though linear algebra libraries such as LAPACK provides manually blocked implementations of these algorithms, by automatically generating blocked versions of the computations, more benefit can be gained such as automatic adaptation of different blocking strategies. This paper demonstrates how to apply an aggressive loop transformation technique, dependence hoisting, to produce efficient blockings for both QR and LU with partial pivoting. We present different blocking strategies that can be generated by our optimizer and compare the performance of auto-blocked versions with manually tuned versions in LAPACK, both using reference BLAS, ATLAS BLAS and native BLAS specially tuned for the underlying machine architectures." @default.
• W1998492046 created "2016-06-24" @default.
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• W1998492046 date "2004-01-01" @default.
• W1998492046 modified "2023-10-16" @default.
• W1998492046 title "Automatic blocking of QR and LU factorizations for locality" @default.
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• W1998492046 doi "https://doi.org/10.1145/1065895.1065898" @default.
• W1998492046 hasPublicationYear "2004" @default.
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