Extension causes high cpu load

[kingluda]

• Issue Type: Performance
• Extension Name: vscode-pylance
• Extension Version: 2022.10.30
• OS Version: Windows_NT x64 10.0.19044
• VS Code version: 1.72.2

⚠️ Make sure to attach this file from your home-directory:
⚠️file:///c%3A/Users/Michael/AppData/Local/Temp/ms-python.vscode-pylance-unresponsive.cpuprofile.txt

Find more details here: https://github.com/microsoft/vscode/wiki/Explain-extension-causes-high-cpu-load

[bschnurr]

do you have a public code repository? or code example to repro?

[zzzeek]

I'm also having CPU issues for several days now. This is using the sqlalchemy repository, Fedora linux. It starts out fine then after some minutes builds up to 100/200% of CPU under top and vscode functions like hover, outline, etc. become unresponsive. Closing vscode will often leave the pylance process still running and it has to be manually killed.

I will try to run some of the debugging steps later

[bschnurr]

r you using pytest?

[rchiodo]

@zzzeek can you paste your user settings.json file? I'm trying this now with sqlalchemy and not reproing the issue.

[zzzeek]

settings is attached
settings.json.txt

[zzzeek]

so locally it's not doing it now. It goes away after a restart and sometimes takes awhile before it appears again. I will try to turn on the node.js debugging stuff when it does.

[rchiodo]

Thanks, I was finally able to repro. Root cause was this commit:

microsoft/pyright@50e12b4

We should have a fix soon.

[zzzeek]

woah, with my repo? is there a way to make it happen?

[rchiodo]

I repro'd after I ran setup.py in sqlalchemy and then started pip installing more stuff into the venv. Eventually it repros on hover.

[eioe]

I'm suffering from the same issue. A quick fix would be so much appreciated from here. 🙏

[tom-mcclintock]

Also experiencing this issue with poetry venvs. Thanks for investigating @rchiodo!

[heejaechang]

This issue has been fixed in prerelease version 2022.10.41, which we've just released. You can find the changelog here: CHANGELOG.md