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
Biros, George
中科院分区:
数学2区
文献类型:
--
作者:
Chen, Chao;Liang, Tianyu;Biros, George

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我们引入了一个随机算法,即rchol,来构造一个给定拉普拉斯矩阵(a.k.a.,图Laplacian)。从图的角度来看,精确的Cholesky分解在消除行/列之后在底层图中引入了一个团。通过随机化,rchol使用Spielman和Kyng开发的随机采样仅保留集团中边缘的稀疏子集[私人通信,2020]。我们证明了rchol是无故障的,并将其应用于求解具有对称对角占优矩阵的大型稀疏线性方程组。此外,我们并行化rchol的基础上嵌套解剖排序共享内存的机器。我们报告的数值实验,证明了鲁棒性和可扩展性的rchol。例如,我们的并行代码在单个节点上扩展到64个线程,用于求解三维泊松方程,在1024 x 1024 x 1024网格上使用7点模板离散化,这个问题有10亿个未知数。
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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