+Lab 3: Execution Sampling on EP
+-------------------------------
+
+The second method to speed up simulations is to sample the computation
+parts in the code. This means that the person doing the simulation
+needs to know the application and identify parts that are compute
+intensive and take time, while being regular enough not to ruin
+simulation accuracy. Furthermore there should not be any MPI calls
+inside such parts of the code.
+
+Use the EP benchmark, class B, 16 processes.
+
+.. todo:: write this section, and the following ones.
+
+Further Readings
+----------------
+
+You may also be interested in the `SMPI reference article
+<https://hal.inria.fr/hal-01415484>`_ or these `introductory slides
+<http://simgrid.org/tutorials/simgrid-smpi-101.pdf>`_. The `SMPI
+reference documentation <SMPI_doc>`_ covers much more content than
+this short tutorial.
+
+Finally, we regularly use SimGrid in our teachings on MPI. This way,
+our student can experiment with platforms that they do not have access
+to, and the associated visualisation tools helps them to understand
+their work. The whole material is available online, in a separate
+project: the `SMPI CourseWare <https://simgrid.github.io/SMPI_CourseWare/>`_.
+