Mixed-Precision GPU-Multigrid Solvers with Strong Smoothers
Mixed-Precision GPU-Multigrid Solvers with Strong Smoothers
复制标题
具有强大平滑器的混合精度 GPU 多重网格求解器
DOI:
10.1201/b10376-11
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发表时间:
2010
期刊:
影响因子:
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通讯作者:
R. Strzodka
中科院分区:
文献类型:
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作者:
Dominik Göddeke;R. Strzodka
• Sparse iterative linear solvers are the most important building block in (implicit) schemes for PDE problems • In FD, FV and FE discretisations • Lots of research on GPUs so far for Krylov subspace methods, ADI approaches and multigrid • But: Limited to simple preconditioners and smoothing operators •Numerically strong smoothers exhibit inherently sequential data dependencies (impossible to parallelise?) • Strong smoothers required in practice: Anisotropies (mesh, operator), localised nonlinearities from the PDEs etc. increase ill-conditioning of the systems drastically •Multigrid is asymptotically optimal, all other iterative schemes suffer from h-dependencies • In our context: Multigrid = geometric multigrid