Haproxy always consumes 99%-100% CPU

[lukastribus]

@mgadagi

But one thing, all the backends are not included with lua execution only 100 of 2000 I can. Still, you think that will cause the problem.

Absolutely, yes. I few requests per second will suffice to cause mayhem.

Please see:

haproxy/haproxy/blob/master/doc/lua.txt#L161

https://www.mail-archive.com/haproxy@formilux.org/msg42795.html

Lua tasks and blocking IO, okay?

Hello everyone, I had a quick question about blocking system calls while writing Lua code to expand HAproxy functionality. From https://raw.githubusercontent.com/haproxy/haproxy/master/doc/lua.txt, I’ve been reading that it is discouraged to use io.*` calls as they’re blocking in nature, so I understand that when those blocking operations are happening, HAproxy thread will not be able to process other HTTP requests. It definitely makes sense if they are done in lua service/actions etc, however…