Idle cpu consumption

[belovaf]

Expected Behavior

Actix doesn't consume cpu while idle.

Current Behavior

Actix constantly consumes 0.1% cpu while idle.

Steps to Reproduce (for bugs)

Start hello world actix server.

Context

I have tested other web frameworks: axum, ntex. They don't consume any cpu while idle as expected.

Your Environment

• Rust Version (I.e, output of rustc -V): 1.79
• Actix Web Version: 4.8.0

[belovaf]

It looks like actix-web contains a busy-loop.
My system monitor shows that an actix process constantly increases the number of "Idle Wake Ups":
Number of times a thread caused the system to wake up from idleness to begin executing the thread.

[belovaf]

I tried to debug and I see that actix-server worker threads are busy-looping.
Worker threads are constantly parked / unparked.

[belovaf]

Also the process system call counter is constantly increasing while idle.