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doc/news/changes/incompatibilities/20190603MartinKronbichler
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Changed: The functions DoFHandler::n_locally_owned_dofs_per_processor(), | ||
DoFHandler::locally_owned_dofs_per_processor() and | ||
DoFHandler::locally_owned_mg_dofs_per_processor() previously return a | ||
reference to an internally stored array of index sets on all processors. As | ||
this cannot scale to large processor counts, these functions have been marked | ||
deprecated and only populate the internal vectors on the first demand. Use the | ||
new functions DoFHandler::compute_n_locally_owned_dofs_per_processor(), | ||
DoFHandler::compute_locally_owned_dofs_per_processor() and | ||
DoFHandler::compute_locally_owned_mg_dofs_per_processor() instead or, even | ||
better for scalability, avoid them in favor of some local communication. | ||
<br> | ||
(Martin Kronbichler, 2019/06/03) |
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Improved: A number of places in deal.II previously called `MPI_Allgather` | ||
followed by some local sums to compute prefix sums. Now the more appropriate | ||
`MPI_Exscan` is used instead, which improves scalability of setup routines on | ||
more than 10k processors. | ||
<br> | ||
(Martin Kronbichler, Peter Munch, 2019/06/03) |