High CPU usage

[nickpetrovic]

Type: Performance Issue

Behaviour

CPU usage should be minimal. Ideally less than 5%.

These pyenv-which and pyenv-exec processes are spawned as soon as VSCode is opened. Takes a few minutes before they start hitting 100%. They also never terminate when you completely close VSCode. Manually terminating the processes then restarting VSCode will do the same thing over again.

Steps to reproduce:

1. Open VSCode
2. Open a Python project or two
3. Make sure the Python extension is enabled
4. Wait about 5 minutes for your CPU to be pegged
5. Kill VSCode, observe the pyenv-exec processes with ms-python.vscode-pylance in the -I argument
6. Reopen VSCode and now more of the same processes are running, but CPU is completely pegged

Diagnostic data

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

XXX

Extension version: 2024.13.2024080701
VS Code version: Code 1.92.0 (b1c0a14de1414fcdaa400695b4db1c0799bc3124, 2024-07-31T23:26:45.634Z)
OS version: Darwin arm64 23.6.0
Modes:

• Python version (& distribution if applicable, e.g. Anaconda): 3.8.19
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Poetry
• Value of the python.languageServer setting: Default

User Settings

languageServer: "Pylance"

experiments
• enabled: false

Installed Extensions

Extension Name	Extension Id	Version
autoDocstring - Python Docstring Generator	njpwerner.autodocstring	0.6.1
Better Jinja	samuelcolvin.jinjahtml	0.20.0
Django Support	almahdi.code-django	0.5.4
ES7+ React/Redux/React-Native snippets	dsznajder.es7-react-js-snippets	4.4.3
Even Better TOML	tamasfe.even-better-toml	0.19.2
GitHub Actions	github.vscode-github-actions	0.26.3
GitHub Copilot	GitHub.copilot	1.220.1035
GitHub Copilot Chat	GitHub.copilot-chat	0.18.1
GitHub Pull Requests	GitHub.vscode-pull-request-github	0.95.2024080708
GitHub Theme	GitHub.github-vscode-theme	6.3.4
GitLens — Git supercharged	eamodio.gitlens	15.2.3
Go	golang.go	0.42.0
Go Template Support	jinliming2.vscode-go-template	0.2.1
HashiCorp HCL	hashicorp.hcl	0.5.0
HashiCorp Terraform	hashicorp.terraform	2.33.2024073012
IntelliCode	VisualStudioExptTeam.vscodeintellicode	1.3.1
JavaScript Debugger	ms-vscode.js-debug	1.92.0
JavaScript Debugger Companion Extension	ms-vscode.js-debug-companion	1.1.3
Kubernetes	ms-kubernetes-tools.vscode-kubernetes-tools	1.3.16
Live Share	ms-vsliveshare.vsliveshare	1.0.5936
Markdown Preview Mermaid Support	bierner.markdown-mermaid	1.23.1
Material Icon Theme	PKief.material-icon-theme	5.8.0
Modelines	chrislajoie.vscode-modelines	2.0.6
Moonlight	atomiks.moonlight	0.11.1
One Dark Pro	zhuangtongfa.material-theme	3.17.2
Packer	4ops.packer	0.3.0
Prettier - Code formatter	esbenp.prettier-vscode	10.4.0
Pylance	ms-python.vscode-pylance	2024.8.1
Python	ms-python.python	2024.13.2024080701
Python Debugger	ms-python.debugpy	2024.10.0
Table Visualizer for JavaScript Profiles	ms-vscode.vscode-js-profile-table	1.0.9
Tailwind CSS IntelliSense	bradlc.vscode-tailwindcss	0.12.5
vscode-proto3	zxh404.vscode-proto3	0.5.5
vscode-styled-components	styled-components.vscode-styled-components	1.7.8
YAML	redhat.vscode-yaml	1.15.0

System Info

Item	Value
CPUs	Apple M1 Max (10 x 2400)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	10, 9, 9
Memory (System)	32.00GB (0.20GB free)
Process Argv
Screen Reader	no
VM	0%

Process Info

CPU %	Mem MB	   PID	Process
    3	   164	 79220	code main
    0	    66	 79221	   gpu-process
    0	    33	 79222	   utility-network-service
    0	   262	 79223	window [1] (metrics.py — beam-client)
    0	   229	 79224	window [2] (app.py — beta9)
    0	    66	 79348	ptyHost
    0	     0	 79354	     /bin/zsh -il
    0	     0	 79427	     /bin/zsh -i
    0	     0	 79492	     /bin/zsh -i
    1	    98	 79349	shared-process
    0	    66	 79350	fileWatcher [2]
    0	    66	 79351	fileWatcher [1]
    0	   131	 79352	extensionHost [1]
    0	     0	 79417	     /Users/npetrovic/.vscode/extensions/ms-python.python-2024.13.2024080701-darwin-arm64/python-env-tools/bin/pet server
    0	     0	 79444	       bash /Users/npetrovic/.pyenv/libexec/pyenv-exec python -c import json, sys; print('093385e9-59f7-4a16-a604-14bf206256fe');print(json.dumps({'version': '.'.join(str(n) for n in sys.version_info), 'sys_prefix': sys.prefix, 'executable': sys.executable, 'is64_bit': sys.maxsize > 2**32}))
    0	    33	 80132	     /Applications/Visual Studio Code.app/Contents/Frameworks/Code Helper (Plugin).app/Contents/MacOS/Code Helper (Plugin) /Applications/Visual Studio Code.app/Contents/Resources/app/extensions/json-language-features/server/dist/node/jsonServerMain --node-ipc --clientProcessId=79352
    0	    66	 80574	     electron-nodejs (bundle.js )
    0	     0	 81170	       bash /Users/npetrovic/.pyenv/libexec/pyenv-exec python3 -I /Users/npetrovic/.vscode/extensions/ms-python.vscode-pylance-2024.8.1/dist/bundled/files/get_pytest_options.py
    0	     0	 81177	       bash /Users/npetrovic/.pyenv/libexec/pyenv-exec python3 -I /Users/npetrovic/.vscode/extensions/ms-python.vscode-pylance-2024.8.1/dist/bundled/files/get_pytest_options.py
    0	    33	 81061	     electron-nodejs (server-node.js )
    0	    33	 82170	     electron-nodejs (tailwindServer.js )
    0	    98	 79353	extensionHost [2]
    0	     0	 79416	     /Users/npetrovic/.vscode/extensions/ms-python.python-2024.13.2024080701-darwin-arm64/python-env-tools/bin/pet server
    0	     0	 79445	       bash /Users/npetrovic/.pyenv/libexec/pyenv-exec python -c import json, sys; print('093385e9-59f7-4a16-a604-14bf206256fe');print(json.dumps({'version': '.'.join(str(n) for n in sys.version_info), 'sys_prefix': sys.prefix, 'executable': sys.executable, 'is64_bit': sys.maxsize > 2**32}))
    0	    33	 80076	     /Applications/Visual Studio Code.app/Contents/Frameworks/Code Helper (Plugin).app/Contents/MacOS/Code Helper (Plugin) /Applications/Visual Studio Code.app/Contents/Resources/app/extensions/json-language-features/server/dist/node/jsonServerMain --node-ipc --clientProcessId=79353
    0	     0	 80395	     /Users/npetrovic/.vscode/extensions/hashicorp.terraform-2.33.2024073012-darwin-arm64/bin/terraform-ls serve
    0	    66	 80530	     electron-nodejs (bundle.js )
    0	     0	 81185	       bash /Users/npetrovic/.pyenv/libexec/pyenv-exec python3 -I /Users/npetrovic/.vscode/extensions/ms-python.vscode-pylance-2024.8.1/dist/bundled/files/get_pytest_options.py
    0	     0	 81193	       bash /Users/npetrovic/.pyenv/libexec/pyenv-exec python3 -I /Users/npetrovic/.vscode/extensions/ms-python.vscode-pylance-2024.8.1/dist/bundled/files/get_pytest_options.py
    0	    33	 82521	     electron-nodejs (server-node.js )

Screen shots

VSCode running

VSCode closed/quit

Process explorer capturing the high CPU

Things tried

• Completely removed pyenv and deleted the ~/.pyenv directory.
• Tried an older version of pyenv (v2.3.21)
• Wiped out my .venv directories for my projects and reinstalled with poetry
• Disabled the Python extension in VSCode, resolves the issue, but then there's no Python support
• Disabled the Python Debugger, isort, and Ruff extensions in VSCode
• Disabled the Pylance extension, this looks like it resolves it, but after having VSCode open for about 5 minutes, htop shows pyenv-which is still hitting 100% at least every other second, but the process is no where to be found in the process explorer.
• Confirmed that pyenv-which pyenv-exec processes continue to spawn as long as VSCode is opened.
• Set the Python: Language Server setting to None, issue still happens
• This looks identical to this issue on python-environment-tools - High CPU usages python-environment-tools#134

[karthiknadig]

@nickpetrovic is this with particular pyenv environment or just anything in general? Could you share the logs from Output > Python?

[nickpetrovic]

If I remove pyenv entirely, it goes away. Doesn't matter which python project I open up. (See my "Things tried" section.

In my screenshots section, you can see the parent process of pyenv-which is /Users/npetrovic/.vscode/extensions/ms-python.python-2024.13.2024080901-darwin-arm64/python-env-tools/bin/pet server.

Here are the logs you asked for.

2024-08-09 14:22:33.537 [error] Reading directory to watch failed [Error: ENOENT: no such file or directory, scandir '/Users/npetrovic/Projects/beam-client/.pixi/envs'
	at Object.readdirSync (node:fs:1509:26)
	at t.readdirSync (node:electron/js2c/node_init:2:11418)
	at /Users/npetrovic/.vscode/extensions/ms-python.python-2024.13.2024080901-darwin-arm64/out/client/extension.js:2:583006
	at /Users/npetrovic/.vscode/extensions/ms-python.python-2024.13.2024080901-darwin-arm64/out/client/extension.js:2:583197
	at Array.map (<anonymous>)
	at d.initWatchers (/Users/npetrovic/.vscode/extensions/ms-python.python-2024.13.2024080901-darwin-arm64/out/client/extension.js:2:582915)
	at async d.ensureWatchersReady (/Users/npetrovic/.vscode/extensions/ms-python.python-2024.13.2024080901-darwin-arm64/out/client/extension.js:2:539326)] {
  errno: -2,
  code: 'ENOENT',
  syscall: 'scandir',
  path: '/Users/npetrovic/Projects/beam-client/.pixi/envs'
}
2024-08-09 14:22:33.537 [error] Dir "/Users/npetrovic/Projects/beam-client/.pixi/envs" is not watchable (directory does not exist)
2024-08-09 14:22:33.571 [info] Default formatter is set to charliermarsh.ruff for workspace /Users/npetrovic/Projects/beam-client
2024-08-09 14:22:33.580 [info] Python interpreter path: ./.venv/bin/python
2024-08-09 14:22:33.728 [info] > ~/.pyenv/bin/pyenv which python
2024-08-09 14:22:33.728 [info] cwd: .
2024-08-09 14:22:34.669 [info] Starting Pylance language server.

[reserschnell]

I think I have the same issue when I'm working remote with my Raspberry Pi. The CPU overload goes that high, that the SSH connection breaks and I can not reconnect.

[karthiknadig]

This (specifically the pixi error) should get addressed by #23937 . Try the latest pre-release.

[karthiknadig]

Duplicate of #23906