From: Timo Heister <timo.heister@gmail.com>
Date: Tue, 18 Jun 2024 22:09:24 +0000 (-0400)
Subject: MatrixCreator: use queue_size=1 in debug mode
X-Git-Tag: v9.6.0-rc1~181^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F17137%2Fhead;p=dealii.git

MatrixCreator: use queue_size=1 in debug mode
---

diff --git a/include/deal.II/numerics/matrix_creator.templates.h b/include/deal.II/numerics/matrix_creator.templates.h
index 5a67ba86a8..494922bfba 100644
--- a/include/deal.II/numerics/matrix_creator.templates.h
+++ b/include/deal.II/numerics/matrix_creator.templates.h
@@ -781,7 +781,14 @@ namespace MatrixCreator
                                                       &rhs_vector);
       },
       assembler_data,
-      copy_data);
+      copy_data
+#ifdef DEBUG
+      // use chunk_size = 1 to make multithreading bugs/races more likely:
+      ,
+      /* queue_length (default) = */ 2 * MultithreadInfo::n_threads(),
+      /* chunk_size = */ 1
+#endif
+    );
 
     matrix.compress(VectorOperation::add);
   }