RCHOL: Randomized Cholesky Factorization for Solving SDD Linear Systems
RCHOL: Randomized Cholesky Factorization for Solving SDD Linear Systems
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RCHOL:用于求解 SDD 线性系统的随机 Cholesky 分解
DOI:
10.1137/20m1380624
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发表时间:
2021
影响因子:
3.1
通讯作者:
Biros, George
中科院分区:
文献类型:
--
作者:
Chen, Chao;Liang, Tianyu;Biros, George
We introduce a randomized algorithm, namely, rchol, to construct an approximate Cholesky factorization for a given Laplacian matrix (a.k.a., graph Laplacian). From a graph perspective, the exact Cholesky factorization introduces a clique in the underlying graph after eliminating a row/column. By randomization, rchol only retains a sparse subset of the edges in the clique using a random sampling developed by Spielman and Kyng [private communication, 2020]. We prove rchol is breakdown free and apply it to solving large sparse linear systems with symmetric diagonally dominant matrices. In addition, we parallelize rchol based on the nested-dissection ordering for shared-memory machines. We report numerical experiments that demonstrate the robustness and the scalability of rchol. For example, our parallel code scaled up to 64 threads on a single node for solving the three-dimensional Poisson equation, discretized with the 7-point stencil on a 1024 x 1024 x 1024 grid, a problem that hasone billionunknowns.
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影响因子:
3.1
作者:
J. Hook;J. Scott;F. Tisseur;Jonathan D. Hogg
通讯作者:
Jonathan D. Hogg
DOI:
10.1137/1.9780898718003
发表时间:
2003-05
期刊:
--
影响因子:
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Y. Saad
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Y. Saad
DOI:
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2008
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DOI:
--
发表时间:
2020
期刊:
Smoky Mountains Computational Sciences & Engineering Conference (SMC2020
影响因子:
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作者:
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通讯作者:
Dongarra, J.
影响因子:
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作者:
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