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 in a
blog post
about it.
uvloop requires Python 3.8 or greater and is available on PyPI. Use pip to install it:
$ pip install uvloop
Note that it is highly recommended to upgrade pip before installing uvloop with:
$ pip install -U pip
As of uvloop 0.18, the preferred way of using it is via the
uvloop.run()
helper function:
import uvloop
async def main():
# Main entry-point.
...
uvloop.run(main())
uvloop.run()
works by simply configuring asyncio.run()
to use uvloop, passing all of the arguments to it, such as debug
,
e.g. uvloop.run(main(), debug=True)
.
With Python 3.11 and earlier the following alternative snippet can be used:
import asyncio
import sys
import uvloop
async def main():
# Main entry-point.
...
if sys.version_info >= (3, 11):
with asyncio.Runner(loop_factory=uvloop.new_event_loop) as runner:
runner.run(main())
else:
uvloop.install()
asyncio.run(main())
To build uvloop, you'll need Python 3.8 or greater:
Clone the repository:
$ git clone --recursive git@github.com:MagicStack/uvloop.git $ cd uvloop
Create a virtual environment and activate it:
$ python3 -m venv uvloop-dev $ source uvloop-dev/bin/activate
Install development dependencies:
$ pip install -e .[dev]
Build and run tests:
$ make $ make test
uvloop is dual-licensed under MIT and Apache 2.0 licenses.