From: Daniel Arndt <arndtd@ornl.gov>
Date: Wed, 5 May 2021 23:06:14 +0000 (-0400)
Subject: Move barrier between step-6 and step-7
X-Git-Tag: v9.3.0-rc1~128^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1f3fc4527263561a854f233f8d41c9624f0e8fad;p=dealii.git

Move barrier between step-6 and step-7
---

diff --git a/include/deal.II/base/aligned_vector.h b/include/deal.II/base/aligned_vector.h
index 6f0eddc8b0..9f093a09d4 100644
--- a/include/deal.II/base/aligned_vector.h
+++ b/include/deal.II/base/aligned_vector.h
@@ -1510,6 +1510,10 @@ AlignedVector<T>::replicate_across_communicator(const MPI_Comm &   communicator,
           new (&aligned_shmem_pointer[i]) T(std::move(elements[i]));
     }
 
+  // Make sure that the shared memory host has copied the data before we try to
+  // access it.
+  MPI_Barrier(shmem_group_communicator);
+
   // **** Step 7 ****
   // Finally, we need to set the pointers of this object to what we just
   // learned. This also releases all memory that may have been in use
@@ -1553,10 +1557,6 @@ AlignedVector<T>::replicate_across_communicator(const MPI_Comm &   communicator,
   used_elements_end      = elements.get() + array_size;
   allocated_elements_end = used_elements_end;
 
-  // Make sure that the shared memory host has copied the data before we try to
-  // access it.
-  MPI_Barrier(shmem_group_communicator);
-
   // **** Consistency check ****
   // At this point, each process should have a copy of the data.
   // Verify this in some sort of round-about way