Minor in MPI notebooks

notebooks/julia_mpi.ipynb

@@ -260,7 +260,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "ae6b88eb",
+   "id": "7511de1b",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -505,7 +505,8 @@
     "comm = MPI.COMM_WORLD\n",
     "nranks = MPI.Comm_size(comm)\n",
     "rank = MPI.Comm_rank(comm)\n",
-    "println(\"Hello, I am process $rank of $nranks processes!\")\n",
+    "host = MPI.Get_processor_name()\n",
+    "println(\"Hello from $host, I am process $rank of $nranks processes!\")\n",
     "MPI.Finalize()\n",
     "\"\"\"\n",
     "filename = tempname()*\".jl\"\n",
@@ -565,7 +566,8 @@
     "    comm = MPI.COMM_WORLD\n",
     "    nranks = MPI.Comm_size(comm)\n",
     "    rank = MPI.Comm_rank(comm)\n",
-    "    println(\"Hello, I am process $rank of $nranks processes!\")\n",
+    "    host = MPI.Get_processor_name()\n",
+    "    println(\"Hello from $host, I am process $rank of $nranks processes!\")\n",
     "    MPI.Finalize()\n",
     "end\n",
     "run(`$(mpiexec()) -np 4 julia --project=. -e $code`);"

notebooks/mpi_collectives.ipynb

@@ -120,6 +120,16 @@
     "In this example the ranks sleep for a random amount of time and then they call barrier. It is guaranteed that the message \"Done!\" will be printed after all processes printed \"I woke up\" since we used a barrier. Try also to comment out the call to `MPI.Barrier`. You will see that the message can be printed in any order."
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "c6e78389",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "using MPI"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,