Idle cpu consumption - Githubissues

actix / actix-web

Actix Web is a powerful, pragmatic, and extremely fast web framework for Rust.

https://actix.rs

Apache License 2.0

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Idle cpu consumption #3411

Open belovaf opened 1 week ago

belovaf commented 1 week ago

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 commented 1 week ago

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 commented 1 week ago

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

belovaf commented 1 week ago

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