eventlet

Eventlet

Eventlet is a concurrent networking library for Python that allows developers to easily write highly scalable servers. It uses green threads to provide asynchronous I/O without having to deal with callback functions or program complexity.
eventlet image
python networking concurrency asynchronous green-threads

Eventlet: Concurrent Networking Library for Python

Eventlet is a concurrent networking library for Python that allows developers to easily write highly scalable servers. It uses green threads to provide asynchronous I/O without having to deal with callback functions or program complexity.

What is Eventlet?

Eventlet is a concurrent networking library for Python that allows developers to easily write highly scalable network servers. It uses cooperative multitasking and coroutines to provide a high-level synchronous API on top of asynchronous I/O. This makes it easier for developers to write concurrent and parallel code without having to deal with locks, callbacks, threading, or other complexities.

Some key features of Eventlet include:

  • Green threads - Lightweight execution units mapped onto native OS threads.
  • Asynchronous I/O - Non-blocking sockets and file operations for high scalability.
  • Cooperative multitasking - Yielding execution instead of thread blocking when I/O is occurring.
  • Synchronous programming style - Avoids complex callback-based code.
  • Integration with networking protocols - WSGI support, DNS queries, web servers, etc.

Eventlet is commonly used for building high-performance network servers and applications that need to handle a lot of concurrent users and I/O without creating thousands of threads. For example, real-time analytics systems, web APIs, streaming and caching servers. It scales very well horizontally across multiple processes and machines.

Eventlet Features

Features

  1. Asynchronous I/O
  2. Concurrency
  3. Green threads
  4. Monkey patching
  5. Cooperative multitasking

Pricing

  • Open Source

Pros

High scalability

Simplifies concurrent code

Avoids callback spaghetti

Good performance

Cons

Complex debugging

Risk of starvation

Overhead of context switching

Not compatible with all libraries


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