From c237b4cc10280448736ba565229bcb99b253c640 Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Thu, 6 Apr 2023 15:19:21 -0600
Subject: [PATCH] Don't overallocate memory.

---
 source/grid/grid_tools_cache.cc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

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);
-- 
2.39.5