From: Peter Munch <peterrmuench@gmail.com>
Date: Sat, 14 Oct 2023 17:26:37 +0000 (+0200)
Subject: Fix compute_prefix_sum() for serial run
X-Git-Tag: relicensing~397^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F16139%2Fhead;p=dealii.git

Fix compute_prefix_sum() for serial run
---

diff --git a/include/deal.II/lac/sparse_matrix_tools.h b/include/deal.II/lac/sparse_matrix_tools.h
index 6a78644174..c4832c3107 100644
--- a/include/deal.II/lac/sparse_matrix_tools.h
+++ b/include/deal.II/lac/sparse_matrix_tools.h
@@ -151,6 +151,9 @@ namespace SparseMatrixTools
       (void)comm;
       return {0, value};
 #  else
+      if (comm == MPI_COMM_SELF)
+        return {0, value}; // serial triangulation
+
       T prefix = {};
 
       int ierr =