@@ -338,6 +338,8 @@ class BlockingRunner(BaseRunner):

             self._cleanup()

     def elapsed_time(self):

+        """Return the total time elapsed since the runner

+        was started."""

         if self.end_time is None:

             # This shouldn't happen if the BlockingRunner

             # correctly finished.

@@ -532,6 +534,8 @@ class AsyncRunner(BaseRunner):

             self._cleanup()

     def elapsed_time(self):

+        """Return the total time elapsed since the runner

+        was started."""

         if self.task.done():

             end_time = self.end_time

             if end_time is None:

@@ -298,6 +298,15 @@ raise the exception with the stack trace:

     runner.task.result()

+

+You can also check ``runner.tracebacks`` which is a mapping from

+point → traceback.

+

+.. jupyter-execute::

+

+    for point, tb in runner.tracebacks.items():

+        print(f'point: {point}:\n {tb}')

+

 Logging runners

 ~~~~~~~~~~~~~~~

@@ -337,10 +346,16 @@ set of operations on another runner:

     learner.plot().Scatter.I.opts(style=dict(size=6)) * reconstructed_learner.plot()

-Timing functions

-~~~~~~~~~~~~~~~~

+Adding coroutines

+-----------------

+

+In the following example we'll add a `~asyncio.Task` that times the runner.

+This is *only* for demonstration purposes because one can simply

+check ``runner.elapsed_time()`` or use the ``runner.live_info()``

+widget to see the time since the runner has started.

-To time the runner you **cannot** simply use

+So let's get on with the example. To time the runner

+you **cannot** simply use

 .. code:: python