From: Daniel Arndt <daniel.arndt@iwr.uni-heidelberg.de>
Date: Sat, 2 Mar 2019 16:16:12 +0000 (+0100)
Subject: Document the execution space some more
X-Git-Tag: v9.1.0-rc1~309^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=92951fa7959b8a6b53d40b61516b304068023bcc;p=dealii.git

Document the execution space some more
---

diff --git a/include/deal.II/lac/trilinos_tpetra_vector.h b/include/deal.II/lac/trilinos_tpetra_vector.h
index 35e31cc92e..69303e2284 100644
--- a/include/deal.II/lac/trilinos_tpetra_vector.h
+++ b/include/deal.II/lac/trilinos_tpetra_vector.h
@@ -54,11 +54,18 @@ namespace LinearAlgebra
      * LinearAlgebra::VectorSpaceVector class and requires Trilinos to be
      * compiled with MPI support.
      *
-     * Tpetra uses Kokkos for thread-parallelism. In case Trilinos was
-     * configured with CUDA support, this class stores the values in unified
-     * virtual memory space and performs its action on the GPU. In particular,
-     * there is no need for manually synchronizing memory between host and
-     * device.
+     * Tpetra uses Kokkos for thread-parallelism and chooses the execution and
+     * memory space automatically depending on Kokkos configuration. The
+     * priority is ranked from highest to lowest:
+     * - Kokkos::Cuda
+     * - Kokkos::OpenMP
+     * - Kokkos::Threads
+     * - Kokkos::Serial
+     *
+     * In case Kokkos was configured with CUDA support, this class stores the
+     * values in unified virtual memory space and performs its action on the
+     * GPU. In particular, there is no need for manually synchronizing memory
+     * between host and device.
      *
      * @ingroup TrilinosWrappers
      * @ingroup Vectors