Performance issues - occassional UI freeze

Issue Type: Performance Issue

Behaviour

I use a vim emulation extension (tried both Vim and VScode Neovim), and occasionally while editing Python projects my editor will stop responding to my vim commands for a while. Most of the time this is accompanied with the spinning icon in the status bar with “X files to analyze…”, but not always.

Expected vs. Actual Behaviour

Editor will not freeze.

Steps to reproduce:

Edit a large Python project. I have not been able to pinpoint what causes a freeze, but it’s usually after changing a file (as opposed to just moving around between files).

Attachments

I recorded a profile while the editor was stuck. There was also a message in the console saying WARN UNRESPONSIVE extension host, 'ms-python.python' took 99% of 5897.347ms, saved PROFILE here: 'file:///tmp/exthost-46bf7e.cpuprofile' , and I attached that file as well. My trace: python-stuck-CPU-20220120T190655.203Z.cpuprofile.txt Automatically captured trace from warning: exthost-46bf7e.cpuprofile.txt

Diagnostic data

• Python version (& distribution if applicable, e.g. Anaconda): 3.8.12 - self-compiled from Arch AUR
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): VirtualEnvWrapper
• Value of the python.languageServer setting: Pylance

User Settings

defaultLS: {"defaultLSType":"Pylance"}

downloadLanguageServer: true

envFile: "<placeholder>"

venvPath: "<placeholder>"

venvFolders: "<placeholder>"

condaPath: "<placeholder>"

pipenvPath: "<placeholder>"

poetryPath: "<placeholder>"

languageServer: "Pylance"

linting
• enabled: true
• cwd: "<placeholder>"
• Flake8Args: "<placeholder>"
• flake8Enabled: true
• flake8Path: "<placeholder>"
• lintOnSave: true
• banditArgs: "<placeholder>"
• banditEnabled: false
• banditPath: "<placeholder>"
• mypyArgs: "<placeholder>"
• mypyEnabled: false
• mypyPath: "<placeholder>"
• pycodestyleArgs: "<placeholder>"
• pycodestyleEnabled: false
• pycodestylePath: "<placeholder>"
• prospectorArgs: "<placeholder>"
• prospectorEnabled: false
• prospectorPath: "<placeholder>"
• pydocstyleArgs: "<placeholder>"
• pydocstyleEnabled: false
• pydocstylePath: "<placeholder>"
• pylamaArgs: "<placeholder>"
• pylamaEnabled: false
• pylamaPath: "<placeholder>"
• pylintArgs: "<placeholder>"
• pylintPath: "<placeholder>"

sortImports
• args: "<placeholder>"
• path: "<placeholder>"

formatting
• autopep8Args: "<placeholder>"
• autopep8Path: "<placeholder>"
• provider: "black"
• blackArgs: "<placeholder>"
• blackPath: "<placeholder>"
• yapfArgs: "<placeholder>"
• yapfPath: "<placeholder>"

testing
• cwd: "<placeholder>"
• debugPort: 3000
• nosetestArgs: "<placeholder>"
• nosetestsEnabled: false
• nosetestPath: "<placeholder>"
• promptToConfigure: true
• pytestArgs: "<placeholder>"
• pytestEnabled: true
• pytestPath: "<placeholder>"
• unittestArgs: "<placeholder>"
• unittestEnabled: false
• autoTestDiscoverOnSaveEnabled: true

terminal
• activateEnvironment: false
• executeInFileDir: "<placeholder>"
• launchArgs: "<placeholder>"

experiments
• enabled: true
• optInto: []
• optOutFrom: []

insidersChannel: "off"

tensorBoard
• logDirectory: "<placeholder>"

Extension version: 2021.12.1559732655 VS Code version: Code 1.63.2 (899d46d82c4c95423fb7e10e68eba52050e30ba3, 2021-12-15T09:39:46.686Z) OS version: Linux x64 5.16.1-arch1-1 Restricted Mode: No

System Info

Item	Value
CPUs	Intel® Core™ i7-8665U CPU @ 1.90GHz (8 x 2947)
GPU Status	2d_canvas: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: disabled_off opengl: enabled_on rasterization: disabled_software skia_renderer: enabled_on video_decode: disabled_software vulkan: disabled_off webgl: enabled webgl2: enabled
Load (avg)	3, 2, 2
Memory (System)	15.44GB (2.31GB free)
Process Argv	–no-sandbox --unity-launch --crash-reporter-id 4eca593c-aba3-413d-89f9-312acde53d4b
Screen Reader	no
VM	0%
DESKTOP_SESSION	undefined
XDG_CURRENT_DESKTOP	sway
XDG_SESSION_DESKTOP	undefined
XDG_SESSION_TYPE	wayland

Process Info

CPU %	Mem MB	   PID	Process
    0	   206	252664	code main
    0	    32	252667	   zygote
    0	   126	252693	     gpu-process
    0	    32	252668	   zygote
    0	   285	314060	     window (undefined)
    0	    79	316208	     issue-reporter
    0	    63	252715	   utility-network-service
    0	   158	252881	   shared-process
    0	    79	252903	     ptyHost
    0	     0	253055	       /usr/bin/fish
    0	    79	285791	     watcherServiceParcelSharedProcess
    0	     0	316227	     /usr/bin/ps -ax -o pid=,ppid=,pcpu=,pmem=,command=
    0	   601	285747	   window (extension.js - medigator - Visual Studio Code)
    0	   632	285779	   extensionHost
    0	    47	285888	     /usr/bin/nvim -N --embed -c source /home/nadav/.vscode/extensions/asvetliakov.vscode-neovim-0.0.83/vim/vscode-options.vim --cmd source /home/nadav/.vscode/extensions/asvetliakov.vscode-neovim-0.0.83/vim/vscode-neovim.vim -c cd /home/nadav/medigate/medigator
    0	   111	285958	     /opt/visual-studio-code/code --ms-enable-electron-run-as-node /home/nadav/.vscode/extensions/streetsidesoftware.code-spell-checker-2.1.4/packages/_server/dist/main.js --node-ipc --clientProcessId=285779
    0	   601	312446	     /opt/visual-studio-code/code --ms-enable-electron-run-as-node /home/nadav/.vscode/extensions/ms-python.vscode-pylance-2022.1.1/dist/server.bundle.js --cancellationReceive=file:418b001d30a217033d47d5abb273c4150e7f7ad90f --node-ipc --clientProcessId=285779
    0	   285	315720	     /opt/visual-studio-code/code --ms-enable-electron-run-as-node --max-old-space-size=3072 /opt/visual-studio-code/resources/app/extensions/node_modules/typescript/lib/tsserver.js --serverMode partialSemantic --useInferredProjectPerProjectRoot --disableAutomaticTypingAcquisition --cancellationPipeName /tmp/vscode-typescript1000/b7c2f460e29470229b77/tscancellation-1936e2fa1524f4d3e450.tmp* --globalPlugins @vsintellicode/typescript-intellicode-plugin --pluginProbeLocations /home/nadav/.vscode/extensions/visualstudioexptteam.vscodeintellicode-1.2.15 --locale en --noGetErrOnBackgroundUpdate --validateDefaultNpmLocation
    0	   411	315721	     /opt/visual-studio-code/code --ms-enable-electron-run-as-node --max-old-space-size=3072 /opt/visual-studio-code/resources/app/extensions/node_modules/typescript/lib/tsserver.js --useInferredProjectPerProjectRoot --enableTelemetry --cancellationPipeName /tmp/vscode-typescript1000/b7c2f460e29470229b77/tscancellation-df7a9c7c3d22ec906e07.tmp* --globalPlugins @vsintellicode/typescript-intellicode-plugin --pluginProbeLocations /home/nadav/.vscode/extensions/visualstudioexptteam.vscodeintellicode-1.2.15 --locale en --noGetErrOnBackgroundUpdate --validateDefaultNpmLocation
    0	    79	315747	       /opt/visual-studio-code/code --ms-enable-electron-run-as-node /opt/visual-studio-code/resources/app/extensions/node_modules/typescript/lib/typingsInstaller.js --globalTypingsCacheLocation /home/nadav/.cache/typescript/4.5 --enableTelemetry --typesMapLocation /opt/visual-studio-code/resources/app/extensions/node_modules/typescript/lib/typesMap.json --validateDefaultNpmLocation

Workspace Info

|  Window (extension.js - medigator - Visual Studio Code)
|      Error: Unable to collect workspace stats for folder /home/nadav/medigate/medigator (TypeError: t is not iterable);

A/B Experiments

vsliv368:30146709
vsreu685:30147344
python383cf:30185419
vspor879:30202332
vspor708:30202333
vspor363:30204092
pythonvspyl392:30425749
pythontb:30283811
pythonvspyt551cf:30345471
pythonptprofiler:30281270
vshan820:30294714
vstes263cf:30335440
pythondataviewer:30285071
vscod805cf:30301675
pythonvspyt200:30340761
binariesv615:30325510
bridge0708:30335490
bridge0723:30353136
vsaa593:30376534
vsc1dst:30424896
pythonvs932:30410667
vscop804:30404766
vs360cf:30404996
vsrem710cf:30416617
vsbas813:30426126

[karthiknadig]

We are re-writing the test adapters, when that work is done it should improve the test scenario (if that is the thing that was causing the UI freeze). #17242

[karthiknadig]

Thanks for letting us know. I will close this for now.