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 Understanding Eventlet 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
   "eventlet.hubs.use_hub()" at the beginning of the program.

EVENTLET_THREADPOOL_SIZE

   The size of the threadpool in "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.
