Combining Sparse Approximate Factorizations with Mixed-precision Iterative Refinement
Combining Sparse Approximate Factorizations with Mixed-precision Iterative Refinement
复制标题
将稀疏近似因式分解与混合精度迭代细化相结合
DOI:
10.1145/3582493
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发表时间:
2023
影响因子:
2.7
通讯作者:
Amestoy P
中科院分区:
文献类型:
--
作者:
Amestoy P
The standard LU factorization-based solution process for linear systems can be enhanced in speed or accuracy by employing mixed-precision iterative refinement. Most recent work has focused on dense systems. We investigate the potential of mixed-precision iterative refinement to enhance methods for sparse systems based on approximate sparse factorizations. In doing so, we first develop a new error analysis for LU- and GMRES-based iterative refinement under a general model of LU factorization that accounts for the approximation methods typically used by modern sparse solvers, such as low-rank approximations or relaxed pivoting strategies. We then provide a detailed performance analysis of both the execution time and memory consumption of different algorithms, based on a selected set of iterative refinement variants and approximate sparse factorizations. Our performance study uses the multifrontal solver MUMPS, which can exploit block low-rank factorization and static pivoting. We evaluate the performance of the algorithms on large, sparse problems coming from a variety of real-life and industrial applications showing that mixed-precision iterative refinement combined with approximate sparse factorization can lead to considerable reductions of both the time and memory consumption.
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DOI:
--
发表时间:
2010
期刊:
影响因子:
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作者:
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通讯作者:
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DOI:
--
发表时间:
2023
期刊:
The international journal of high performance computing applications
影响因子:
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影响因子:
2.1
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DOI:
10.1137/050629598
发表时间:
2007
期刊:
SIAM J. Matrix Anal. Appl.
影响因子:
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作者:
I. Duff;S. Pralet
通讯作者:
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DOI:
10.1137/120903476
发表时间:
2015-06
期刊:
SIAM J. Sci. Comput.
影响因子:
--
作者:
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通讯作者:
P. Amestoy;C. Ashcraft;O. Boiteau;A. Buttari;J. L’Excellent;Clément Weisbecker