Add MPI barrier

python/src/distributed.cpp

@@ -44,7 +44,8 @@ void init_distributed(nb::module_& parent_module) {
               color (int): A value to group processes into subgroups.
               key (int, optional): A key to optionally change the rank ordering
                 of the processes.
-          )pbdoc");
+          )pbdoc")
+      .def("barrier", &distributed::Group::barrier, "Make a synhronization point for all nodes in the group");
 
   m.def(
       "is_available",