IntelliSense using too much memory and resetting pch

Ok, got it.

Your PCH some logic has issues. I have 2 files PawnTank.h and PawnTank.cpp. If in PawnTank.ccp when I do a look up (hover with with left mouse button held down) cpptools.srv goes up as high as 2GB Real Mem then generates a 1.7GB PCH cache file for PawnTank.h. This takes about 50 seconds. If I close PawnTank.cpp, then reopen it, the whole process takes another 60 seconds as PawnTank.h PCH is regenerated unnecessarily yet again.

You're building a huge in memory cache structure, then dumping it when the file is closed. I recommend some sort've memory mapped DB that is local plus better cache invalidation logic.

The UE4 tutorial "Toon Tanks" is here https://gitlab.com/GameDevTV/UnrealCourse/ToonTanks. Install UE4, clone "Toon Tanks", build and step around, you'll see.

I didn't want this to be a career move so I'm going to live with what I've got.

I switched C_Cpp Tag Parser and for the time being, it works like a charm.

Originally posted by @magwa101 in https://github.com/microsoft/vscode-cpptools/issues/7143#issuecomment-796247121

Reproduce the report with the UnrealCourse ToonTanks project, focusing on PawnTank.h and PawnTank.cpp while monitoring cpptools.srv memory use and PCH cache regeneration. Compare the behavior during hover lookup, closing, and reopening PawnTank.cpp; done would mean the lookup does not create excessive memory use or unnecessarily regenerate the PCH.