C++ IntelliSense memory leak

[RARain]

Type: LanguageService

Describe the bug

• OS and Version: ubuntu16.04
• VS Code Version: 1.31
• C/C++ Extension Version: 0.21.0
• Other extensions you installed (and if the issue persists after disabling them):
• A clear and concise description of what the bug is.

To Reproduce

1. Go to 'https://www.hikvision.com/cn/download_more_403.html'
2. Click on download 'SDK_V6.0.2.2(for Linux64)'
3. Extract and Open, click ./incCn/HCNetSDK.h in VsCode
4. Open SystemMonitor, watch the intellisense memory a moment
5. See error

Expected behavior

Screenshots

Additional context

[ben-the-hedgehog]

Seeing this as well with Ubuntu 14.04, code-insiders 1.32.0, and C/C++ ext 0.21.0

[sean-mcmanus]

Can you try the latest Insiders release? We improved the memory usage: https://github.com/Microsoft/vscode-cpptools/releases , although we didn't intentionally fix any "leak".

[ben-the-hedgehog]

Still seeing the same issues with the pre-release version. Not sure if the issue is a "memory leak", but Intellisense uses up all of the available memory on startup.

[sean-mcmanus]

@ben-the-hedgehog Are you on 32-bit Linux? The memory improvement we made doesn't work on 32-bit Linux.

[ben-the-hedgehog]

I'm on 64 bit Ubuntu 14.04
4.4.0-131-generic #157~14.04.1-Ubuntu SMP Fri Jul 13 08:53:17 UTC 2018 x86_64 GNU/Linux

[sean-mcmanus]

This only repros for you when opening certain files, right? Do you have a lot of red or green squiggles from missing includes -- in that case it can cause our parser to accumulate an unusually large size. I think we will need some sort of repro in order to investigate/fix this, but I seem to recall on chromium I got 2 GB of usage and it was "by design", but I can re-check if that case got worse or not.

[nerdmaennchen]

I think I'm experiencing the same thing.
I'm working tao::pegtl in a project and Intellisense eats all my RAM and swap (24GB total until it runs out of memory and crashes).

I love vscode but this behavior is really painfull for me as it renders vscode hardly usable for big (template heavy) C++ projects.

FYI: I'm on ARCH
Linux Urmel 5.4.6-arch3-1 #1 SMP PREEMPT Tue, 24 Dec 2019 04:36:53 +0000 x86_64 GNU/Linux

[sean-mcmanus]

@nerdmaennchen Can you confirm you're using the C/C++ extension version 0.26.2 (and not 0.26.3-insiders2) and that the process using memory is Microsoft.VSCode.CPP.IntelliSense.Msvc.linux and not Microsoft.VSCode.CPP.Extension.linux (want to make sure it's not a different issue).