How to use rust-analyzer only for linting?

[rawhuul]

rust-analyzer chokes my system by consuming RAM on mid-size project (80-90k LOC project split across crates), it takes almost 2GB RAM out of 8GB (this is not specific to any editor it happens in neovim, sublime, and emacs - I tested them). Lately, I realised that I don’t need all the features provided by rust-analyzer, just need linting. So, how can I use rust-analyzer to do only just linting and nothing else?

[ShoyuVanilla]

Which lints are you referring to? rust-analyzer provides two kinds of diagnostics:

• Native diagnostics, emitted directly by rust-analyzer.
• Flycheck diagnostics, which come from running cargo check (or a custom command) in the background and forwarding its output to the editor.

Anyway, there’s no option to disable anything but those diagnostics.

[rawhuul]

Yes, I only want Native Diagnostics, no completions, inlay hints, snippets, etc.

[ShoyuVanilla]

For native diagnostics, disabling other features won’t lead to a noticeable performance gain. Most of the work required for diagnostics overlaps with what rust-analyzer already does during normal operation, so memory usage won’t significantly decrease.

If your goal is to reduce memory usage at startup, you can disable rust-analyzer.cachePriming.enable. However, keep in mind that as you continue editing files, memory usage will eventually converge to a similar level regardless.

[ChayimFriedman2]

To expand on what @ShoyuVanilla said, disabling other features will help speed, but not memory usage as the features don't populate memory, it's analysis that does; and once you have one feature, it requires it.

[rawhuul]

I have disabled rust-analyzer.cachePriming.enable for now. Thanks!! I wish memory usage improves in future