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- .. _env_vars:
- Environment Variables
- ======================
- Eventlet's behavior can be controlled by a few environment variables.
- These are only for the advanced user.
- EVENTLET_HUB
- Used to force Eventlet to use the specified hub instead of the
- optimal one. See :ref:`understanding_hubs` for the list of
- acceptable hubs and what they mean (note that picking a hub not on
- the list will silently fail). Equivalent to calling
- :meth:`eventlet.hubs.use_hub` at the beginning of the program.
- EVENTLET_THREADPOOL_SIZE
- The size of the threadpool in :mod:`~eventlet.tpool`. This is an
- environment variable because tpool constructs its pool on first
- use, so any control of the pool size needs to happen before then.
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