C10K Problem

[nao16t]

Hello,

I wrote a Yesod application with this WebSocket Library.
This WebSocket Library works great, thanks.

However, I have C10K problem in terms of WebSocket connection.
My server terminates due to "failed to create OS thread"
when the number of clients exceeded about 1000 in my environment:
Windows 7 32bit,
Haskell Platform 2013.2.0.0 Windows 32bit binary.

I confirmed that the example, server.lhs, reproduced the same symptom too.
The server increases one OS Thread per client.

Is this a known problem?

Best regards,
nao16t

[jaspervdj]

It's a problem I didn't know about. I tested it using the built-in server (not Yesod) on Linux and it smoothly goes over a thousand connections when running this script: https://github.com/jaspervdj/websockets/blob/master/benchmarks/echo.js

I'll try it using the Yesod backend later. Unfortunately I don't have a Windows machine to test this though.

[nao16t]

jaspervdj-san,

Thank you for investigating quickly.
I tried echo.hs you checked in yesterday on Linux using VMWare Player too.
Ubuntu 13.10 64bit
Haskell Platform 2013.2.0.0 64bit binary

I confirmed that 10K connections worked Okay and the number of OS
threads stayed 3.

So this problem happens only on Windows.