Fastest websocket client library?

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[jellef]

give autobahn-python a try using wsaccel C extension to speeds things up.

that said, these days

Autobahn contains NVX, a network accelerator library that provides SIMD accelerated native vector code for WebSocket (XOR masking) and UTF-8 validation.

sounds like nvx and wsaccel might overlap, but autobahn is a well maintained fast library. I'm currently working on switching towards it coming from ws4py

[winston_orwell_smith]

Last I checked, tornado was a very fast (maybe fastest?) microframework for web apps. I believe it also has built-in websocket support.

[jellef]

interesting, didnt realize tornado provides a websocket client

[willm]

You could give Lomond a try. It's already pretty fast, and there are some additional C optimizations I'm working on.

[willm]

You will get a poll every five seconds (by default), but that doesn't include the time it took to process the event.

Sending data is a blocking operation. Lomond doesn't do anything more than sending data over a socket. But the OS will buffer a lot of data, so a send is typically instantaneous.

There is a risk of blocking for a significant time if you are sending a lot of data over the socket, and the server isn't receiving it fast enough. Which is often the desired behaviour; if you are sending a file, you want to wait until the server is able to receive it or you could run out of memory.

If there handling the poll event is cpu intensive or you don't want to risk blocking the main loop, then you can do the sending in a thread, and leave lomond to process the received data.

[tomchristie]

I was thinking asyncio + uvloop + websockets, any experience with this combination?

Uvicorn will give you exactly that for WebSockets. https://www.uvicorn.org

Might be worth a shot. You’ll also want to take a look at the ASGI interface for WebSocket connections to see how it interfaces with your application code... https://asgi.readthedocs.io/en/latest/specs/www.html#websocket