From: Marc Fehling <mafehling.git@gmail.com>
Date: Fri, 30 Aug 2024 17:13:51 +0000 (-0600)
Subject: Make sure stride_small_size is at least 1.
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=034fee0c8bcf7a5b33683a97745c8b34eff22f7c;p=dealii.git

Make sure stride_small_size is at least 1.
---

diff --git a/source/base/mpi_compute_index_owner_internal.cc b/source/base/mpi_compute_index_owner_internal.cc
index c7825de990..d6795a0f35 100644
--- a/source/base/mpi_compute_index_owner_internal.cc
+++ b/source/base/mpi_compute_index_owner_internal.cc
@@ -19,6 +19,8 @@
 
 #include <boost/serialization/utility.hpp>
 
+#include <algorithm>
+
 DEAL_II_NAMESPACE_OPEN
 
 namespace Utilities
@@ -439,12 +441,11 @@ namespace Utilities
 
           dofs_per_process = (size + n_procs - 1) / n_procs;
           if (dofs_per_process < range_minimum_grain_size)
-            {
-              dofs_per_process  = range_minimum_grain_size;
-              stride_small_size = dofs_per_process * n_procs / size;
-            }
-          else
-            stride_small_size = 1;
+            dofs_per_process = range_minimum_grain_size;
+
+          stride_small_size =
+            std::max<unsigned int>(dofs_per_process * n_procs / size, 1);
+
           local_range.first  = get_index_offset(my_rank);
           local_range.second = get_index_offset(my_rank + 1);