Mixed Precision Iterative Refinement Methods for Linear Systems: Convergence Analysis Based on Krylov Subspace Methods

Mixed Precision Iterative Refinement Methods for Linear Systems: Convergence Analysis Based on Krylov Subspace Methods
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线性系统混合精度迭代细化方法:基于Krylov子空间方法的收敛性分析

DOI:
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发表时间:
2010
期刊:
Workshop on Applied Parallel Computin
影响因子:
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通讯作者:
B. Rocker
B. Rocker
中科院分区:
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文献类型:
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作者:
H. Anzt;V. Heuveline;B. Rocker

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克雷洛夫子空间求解器的收敛分析通常提供计算成本的估算。精确了解使用不同浮点精度格式的误差修正方法的收敛理论,将有助于先验地确定使用某种克雷洛夫子空间方法作为误差修正求解器的混合精度迭代精化求解器在高精度方面是否优于普通求解器。本文揭示了使用克雷洛夫子空间方法作为内求解器的混合精度迭代精化方法的特点。
The convergence analysis of Krylov subspace solvers usually provides an estimation for the computational cost. Exact knowledge about the convergence theory of error correction methods using different floating point precision formats would enable to determine a priori whether the implementation of a mixed precision iterative refinement solver using a certain Krylov subspace method as error correction solver outperforms the plain solver in high precision. This paper reveals characteristics of mixed precision iterative refinement methods using Krylov subspace methods as inner solver.