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uvloop 0.9.1

Fast implementation of asyncio event loop on top of libuv

uvloop is a fast, drop-in replacement of the built-in asyncio event loop. uvloop is implemented in Cython and uses libuv under the hood.

The project documentation can be found here. Please also check out the wiki.


uvloop makes asyncio 2-4x faster.

The above chart shows the performance of an echo server with different message sizes. The sockets benchmark uses loop.sock_recv() and loop.sock_sendall() methods; the streams benchmark uses asyncio high-level streams, created by the asyncio.start_server() function; and the protocol benchmark uses loop.create_server() with a simple echo protocol. Read more about uvloop performance.


uvloop requires Python 3.5 and is available on PyPI. Use pip to install it:

$ pip install uvloop

Using uvloop

To make asyncio use uvloop, you can install the uvloop event loop policy:

import asyncio
import uvloop

Alternatively, you can create an instance of the loop manually, using:

loop = uvloop.new_event_loop()

Development of uvloop

To build uvloop, you’ll need Cython and Python 3.5. The best way is to create a virtual env, so that you’ll have cython and python commands pointing to the correct tools.

  1. git clone --recursive
  2. cd uvloop
  3. make
  4. make test


uvloop is dual-licensed under MIT and Apache 2.0 licenses.

File Type Py Version Uploaded on Size
uvloop-0.9.1-cp35-cp35m-macosx_10_11_x86_64.whl (md5) Python Wheel cp35 2017-11-29 1MB
uvloop-0.9.1-cp35-cp35m-manylinux1_i686.whl (md5) Python Wheel cp35 2017-11-29 2MB
uvloop-0.9.1-cp35-cp35m-manylinux1_x86_64.whl (md5) Python Wheel cp35 2017-11-29 2MB
uvloop-0.9.1-cp36-cp36m-macosx_10_11_x86_64.whl (md5) Python Wheel cp36 2017-11-29 1MB
uvloop-0.9.1-cp36-cp36m-manylinux1_i686.whl (md5) Python Wheel cp36 2017-11-29 2MB
uvloop-0.9.1-cp36-cp36m-manylinux1_x86_64.whl (md5) Python Wheel cp36 2017-11-29 3MB
uvloop-0.9.1.tar.gz (md5) Source 2017-11-29 1MB