From: Peter Munch <peterrmuench@gmail.com>
Date: Thu, 7 Oct 2021 12:39:39 +0000 (+0200)
Subject: Global coarsening: reset ghost state of internal vectors
X-Git-Tag: v9.4.0-rc1~952^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4b389babd77ec7b466bfef654badb1925f35ada0;p=dealii.git

Global coarsening: reset ghost state of internal vectors
---

diff --git a/include/deal.II/multigrid/mg_transfer_global_coarsening.templates.h b/include/deal.II/multigrid/mg_transfer_global_coarsening.templates.h
index 71c38856ef..d0a9fa7164 100644
--- a/include/deal.II/multigrid/mg_transfer_global_coarsening.templates.h
+++ b/include/deal.II/multigrid/mg_transfer_global_coarsening.templates.h
@@ -2560,6 +2560,12 @@ MGTwoLevelTransfer<dim, LinearAlgebra::distributed::Vector<Number>>::
         }
     }
 
+  // clean up related to update_ghost_values()
+  if (use_src_inplace == false)
+    vec_fine_ptr->set_ghost_state(false); // internal vector
+  else if (fine_element_is_continuous)
+    vec_fine_ptr->zero_out_ghost_values(); // external vector
+
   this->vec_coarse.compress(VectorOperation::add);
 
   dst.copy_locally_owned_data_from(this->vec_coarse);
@@ -2669,6 +2675,12 @@ MGTwoLevelTransfer<dim, LinearAlgebra::distributed::Vector<Number>>::
         }
     }
 
+  // clean up related to update_ghost_values()
+  if (use_src_inplace == false)
+    vec_fine_ptr->set_ghost_state(false); // internal vector
+  else if (fine_element_is_continuous)
+    vec_fine_ptr->zero_out_ghost_values(); // external vector
+
   dst.copy_locally_owned_data_from(this->vec_coarse);
 }