gevent

What it is

Gevent is a coroutine-based Python networking library that uses greenlet to provide high-level synchronous API on top of the libev event loop. It's designed for building scalable network services and applications with non-blocking I/O operations.

Gevent offers a unique approach to Python networking by leveraging greenlets for coroutine-based execution, providing an efficient way to handle multiple connections without the overhead of threads or processes.

When it fits — and when it doesn’t

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

1. 01

   Limited language support

   Gevent is tightly coupled with Python and does not have native support for other languages, limiting its use in polyglot environments.

2. 02

   Performance issues under heavy load

   The greenlet-based coroutines can lead to performance bottlenecks when dealing with a large number of concurrent connections due to the GIL (Global Interpreter Lock).

3. 03

   Complex setup and configuration

   Setting up gevent requires careful management of monkey patching, which can lead to subtle bugs if not done correctly.

4. 04

   Poor documentation for advanced use cases

   The official documentation is sparse on detailed examples and best practices for more complex scenarios such as integrating with other Python libraries or handling edge cases.

What it does well

• Coroutine-based networking with greenlets

• High-level synchronous API on top of libev event loop

• Supports non-blocking I/O operations for scalable network services

Pricing

Free tier

YesOpen source — free to use

Paid from

$0

Model

Flat rate

Enterprise plan

No

Pricing not independently confirmed — check the vendor’s page.