There are also a couple of tools people have written:
- jupyter-tools/hub-stress-test.py at 747256d3a994ab36abfeba501f14cc05307facd9 · IBM/jupyter-tools · GitHub
- GitHub - yuvipanda/hubtraf: Traffic simulator for JupyterHub
and see this related thread Jupyterhub Can a large number of users start the service at the same time