Exploiting variable precision in GMRES
Exploiting variable precision in GMRES
复制标题
利用 GMRES 中的可变精度
DOI:
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发表时间:
2019
期刊:
影响因子:
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通讯作者:
P. Toint
中科院分区:
文献类型:
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作者:
S. Gratton;E. Simon;D. Titley;P. Toint
We describe how variable precision floating point arithmetic can be used in the iterative solver GMRES. We show how the precision of the inner products carried out in the algorithm can be reduced as the iterations proceed, without affecting the convergence rate or final accuracy achieved by the iterates. Our analysis explicitly takes into account the resulting loss of orthogonality in the Arnoldi vectors. We also show how inexact matrix-vector products can be incorporated into this setting.