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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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