rust-lang / rust-lang/rust-analyzer
`node` process related to fileWatcher consumes 100% CPU due to latest rust-analyzer
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Description
rust-analyzer version: (eg. output of "rust-analyzer: Show RA Version" command, accessible in VSCode via Ctrl/⌘+Shift+P)
From "0.3.1896" and later
rustc version: (eg. output of rustc -V)
rustc 1.72.0 (5680fa18f 2023-08-23)
editor or extension: (eg. VSCode, Vim, Emacs, etc. For VSCode users, specify your extension version; for users of other editors, provide the distribution if applicable)
VSCode w/ rust-analyzer version: 0.3.1896-standalone
relevant settings: (eg. client settings, or environment variables like CARGO, RUSTC, RUSTUP_HOME or CARGO_HOME)
I am woring on Rust code in Linux machine via Remote Development Extension with VSCode.
(i.e., VSCode is installed on Windows machine but Rust code exists in Linux machine.)
And, I am developing Rust code in Android source code(AOSP).
Because code in AOSP is too HUGE, I am using Multi-root Workspace feature in VSCode.
It means I registered necessary directories for me in VSCode workspace.
repository link (if public, optional): (eg. rust-analyzer)
https://github.com/rust-lang/rust-analyzer
code snippet to reproduce:
// add your code here
n/a
more detailed information of issue:
I can see one node process in Linux machine consumes 100% CPU usage and it never dies even if I closed all VSCode.
This node process is related to fileWatcher and I found that this process is started when I open VSCode workspace which is using rust-analyzer.
Please refer below comment for process information:
I checked VSCode log (w/ verbose log enabled) and I found
- when
rust-analyzeris launched, it registers several directories to fileWatcher. - workspace directories are registered and,
- ALL Android source code directories are also registered to fileWatcher. (as I mentioned, Android source code is really huge)
Also, I found that this issue starts to occur from specific rust-analyzer version.
- ~ v0.3.1885 : issue is not occuring.
- v0.3.1896 ~ : confimed that issue is occuring.
I believe this is related to different behavior of fileWatcher registration.
- ~ v0.3.1885 : ONLY workspace directories are registered.
- v0.3.1896 ~ : workspace directories and other ALL directories in Android source tree are registered.
Please check why this 100% CPU consumption issue is happening at latest version of rust-analyzer (at least fro v0.3.1896) and give me the fix or guide.
Thanks,
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the report in VSCode using Remote Development, a multi-root AOSP workspace, and rust-analyzer 0.3.1896 or later; compare against 0.3.1885. Start with the verbose VSCode logs and the fileWatcher registrations made when rust-analyzer launches. Done means the watcher no longer registers all unrelated Android source directories and the persistent 100% CPU process is resolved.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust, vscode
- Domain
- devtools, performance
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100