From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Thu, 6 Apr 2023 21:19:21 +0000 (-0600)
Subject: Don't overallocate memory.
X-Git-Tag: v9.5.0-rc1~368^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c237b4cc10280448736ba565229bcb99b253c640;p=dealii.git

Don't overallocate memory.
---

diff --git a/source/grid/grid_tools_cache.cc b/source/grid/grid_tools_cache.cc
index 4caa9a671a..d6e873cad3 100644
--- a/source/grid/grid_tools_cache.cc
+++ b/source/grid/grid_tools_cache.cc
@@ -155,7 +155,12 @@ namespace GridTools
           BoundingBox<spacedim>,
           typename Triangulation<dim, spacedim>::active_cell_iterator>>
           boxes;
-        boxes.reserve(tria->n_active_cells());
+        if (const parallel::TriangulationBase<dim, spacedim> *parallel_tria =
+              dynamic_cast<const parallel::TriangulationBase<dim, spacedim> *>(
+                &*tria))
+          boxes.reserve(parallel_tria->n_locally_owned_active_cells());
+        else
+          boxes.reserve(tria->n_active_cells());
         for (const auto &cell : tria->active_cell_iterators() |
                                   IteratorFilters::LocallyOwnedCell())
           boxes.emplace_back(mapping->get_bounding_box(cell), cell);