Frequent window not responding popup

[sssteja5]

Issue Type: Bug

After disabling all extensions, and enabling one by one, i notice that this extension causes frequent 'Window not responding' popup.

Extension version: 1.9.7
VS Code version: Code 1.66.0 (e18005f0f1b33c29e81d732535d8c0e47cafb0b5, 2022-03-30T05:50:14.623Z)
OS version: Windows_NT x64 10.0.19042
Restricted Mode: No
Remote OS version: Linux x64 5.4.0-90-generic

[michelleangela]

@sssteja5 could you provide more info to help us investigate the issue?

Does the "Window not responding" happen during any specific IntelliSense operation, such as find all references, running code analysis, hover on symbol, etc.? Are there any C_Cpp.* settings configured? Does this only happen when using the extension on a remote machine, or does it also happen when using the extension on the local machine?

[sean-mcmanus]

Also, is there any high CPU or memory usage from VS Code or any of its child processes like cpptools/cpptools-srv processes?

[sssteja5]

@michelleangela : 'windows not responding' happens randomly. No correlation with hover/find_reference, etc.
I dont have a local machine and always use this extension on a remote ssh machine.
These are my extension settings
"C_Cpp.configurationWarnings": "Disabled",
"C_Cpp.errorSquiggles": "Enabled",
"C_Cpp.intelliSenseEngineFallback": "Enabled",
"C_Cpp.workspaceSymbols": "All",
"C_Cpp.codeAnalysis.runAutomatically": false

@sean-mcmanus : I don't see high CPU or mem usage or or high network usage related to VS code at the time of issue.

[michelleangela]

I dont have a local machine and always use this extension on a remote ssh machine.

Just to rule out the Remote SSH extension, does this also occur even when the C/C++ extension is disabled on the remote machine?

[sssteja5]

No. The issue doesn't occur when disabled C/C++ extension as described before with everything else kept as it is. Hence it's narrowed down to this extension.

[michelleangela]

Could you collect a performance profile using the developer tools on VS Code? Note, the performance profile records screenshots of the session, so we recommend to use a project or sample project you wouldn't mind sharing publicly.

Instructions to collect performance profile:

1. Run "Developer: Toggle Developer Tools" from VS Code command palette.
2. Select "Performance" tab
   
3. Start recording session.
4. After repro occurs, stop recording.
5. Right click to "save profile".

[zouyonghao]

Profile-20220517T170934.zip

Hi @michelleangela
I try to use the developer tools and upload the profile, you can see if it helps.

[zouyonghao]

Can we solve the performance issue, because my vscode cannot work due to this for several days.
Maybe some issues are related, like #9339

[michelleangela]

@zouyonghao
The profile log doesn't show anything related to the cpptools extension. The bottleneck could be caused by Remote SSH, I suggest to post the profile logs at the Remote SSH repro https://github.com/microsoft/vscode-remote-release/issues.

In case it is related to #9339, have you tried disabling the IntelliSense cache or setting C_Cpp.intelliSenseCacheSize to 0 to see if that improves performance? Or does this issue occur during any formatting operations? If so, could you also try disabling formatting by the cpptools extension by setting C_Cpp.formatting to Disabled?

[zouyonghao]

@michelleangela
Today I switch to clangd extension, and vscode does not stuck again with same other extensions.

I tried setting C_Cpp.intelliSenseCacheSize to 0, and it still stucks.
I also tried setting C_Cpp.intelliSenseEngine to Disabled, it does not stuck.
I will try C_Cpp.formatting later.

[github-actions]

Hey @michelleangela, this issue might need further attention.

@sssteja5, you can help us out by closing this issue if the problem no longer exists, or adding more information.

[sssteja5]

Hi,
I am no longer seeing this issue after recent vscode updates. not sure what fixed my problem.

[michelleangela]

Closing as resolved.