\dealii{} and required various optimizations
and fixes on top of the ones mentioned above:
(i) Bug fixes to concurrent point to point communications.
-(ii) Fixes multigrid transfer with adaptive refinement and more than \num{4e9} unknowns.
+(ii) Fixes to multigrid transfer with adaptive refinement and more than \num{4e9} unknowns.
(iii) Fixes to index sets in block indices with more than \num{4e9} unknowns.
(iv) Fixes to computations with more than \num{4e9} active cells.
(v) Implementation of IDR(s) solvers to reduce memory overhead.
For more details, see \cite{clevenger_stokes19}.
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-\todo[inline]{Timo added the paragraph above. Thoughts on how much we should mention (none of this worked with 9.1)?}
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-\todo[inline]{Martin: I think (ii) worked in 9.1/9.0/8.5, and (iv) definitely worked in the uniform case for 8.5, see Fig 1 in that paper, data line `8B cells'. We just happened to break things in between. But ``fixes'' is a good wording here because it doesn't exclude that some problems with those configurations have been solved before. So I like the text.}
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\subsection{Better support for parallel $hp$-adaptive algorithms}
\label{subsec:hp}