Eventlet

A concurrent networking library for Python that provides performance and scalability of non-blocking IO while writing simple blocking code (no callbacks) using green threads.

Gevent

Gevent is a coroutine-based Python networking library that uses greenlet to provide a high-level synchronous API on top of libevent (libev after 1.0) event loop.



Use performant lower

Example

"The use of gevent is also a performant option but slightly lower than eventlet"

from question  

Flask SocketIO & uWSGI causes 'TypeError: 'SocketIO' object is not callable'

"The use of gevent is also a performant option but slightly lower than eventlet"

from question  

Flask-SocketIO server using polling instead of websockets

Others

Example

But this popular wsgi benchmark says eventlet is way slower than gevent

from question  

What does make significant difference of performance between eventlet and gevent?

If you want to use threads as your execution pool you can choose between eventlet an gevent

from question  

Celery --pool=threads -- what does this do and how do I use it properly?

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