From: Peter Munch <peterrmuench@gmail.com>
Date: Sun, 3 Apr 2022 21:04:26 +0000 (+0200)
Subject: LA::d::V:reinit() add check
X-Git-Tag: v9.4.0-rc1~337^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9545137b03ecde9c8d0fc145cbfcd5a7560fd984;p=dealii.git

LA::d::V:reinit() add check
---

diff --git a/include/deal.II/lac/la_parallel_vector.templates.h b/include/deal.II/lac/la_parallel_vector.templates.h
index 06a79961fe..f1eca66944 100644
--- a/include/deal.II/lac/la_parallel_vector.templates.h
+++ b/include/deal.II/lac/la_parallel_vector.templates.h
@@ -643,14 +643,17 @@ namespace LinearAlgebra
       const MPI_Comm &                                          comm_sm)
     {
       clear_mpi_requests();
-      partitioner = partitioner_in;
 
       this->comm_sm = comm_sm;
 
       // set vector size and allocate memory
-      const size_type new_allocated_size =
-        partitioner->locally_owned_size() + partitioner->n_ghost_indices();
-      resize_val(new_allocated_size, comm_sm);
+      if (partitioner.get() != partitioner_in.get())
+        {
+          partitioner = partitioner_in;
+          const size_type new_allocated_size =
+            partitioner->locally_owned_size() + partitioner->n_ghost_indices();
+          resize_val(new_allocated_size, comm_sm);
+        }
 
       // initialize to zero
       *this = Number();