Changelog

diff --git a/doc/news/changes/incompatibilities/20200322MartinKronbichler b/doc/news/changes/incompatibilities/20200322MartinKronbichler
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+Deprecated: SparsityTools::distribute_sparsity_pattern() and
+SparsityTools::gather_sparsity_pattern() taking the locally owned index sets
+of all processes as second arguments have been deprecated. Use the respective
+functions only providing the locally owned dofs of the calling process.
+<br>
+(Martin Kronbichler, 2020/03/22)

diff --git a/doc/news/changes/minor/20200322MartinKronbichler b/doc/news/changes/minor/20200322MartinKronbichler
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+New: Variants of SparsityTools::distribute_sparsity_pattern() and
+SparsityTools::gather_sparsity_pattern() taking only the locally owned index
+set of the calling MPI process have been added. They avoid the previously
+necessary MPI all-to-all communication to compute the owned dofs on all
+processes and instead go through Utilities::MPI::compute_index_owned with
+sparse communication. On more than around 1,000 MPI ranks, the new functions
+should be considerably faster.
+<br>
+(Martin Kronbichler, 2020/03/22)