A High-Performance Implementation of a Robust Preconditioner for Heterogeneous Problems

@article{Seelinger2019AHI,
  title={A High-Performance Implementation of a Robust Preconditioner for Heterogeneous Problems},
  author={Linus Seelinger and Anne Reinarz and Robert Scheichl},
  journal={ArXiv},
  year={2019},
  volume={abs/1906.10944}
}
We present an efficient implementation of the highly robust and scalable GenEO preconditioner in the high-performance PDE framework DUNE. The GenEO coarse space is constructed by combining low energy solutions of a local generalised eigenproblem using a partition of unity. In this paper we demonstrate both weak and strong scaling for the GenEO solver on over 15,000 cores by solving an industrially motivated problem with over 200 million degrees of freedom. Further, we show that for highly… 

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