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

UnrealCourse ToonTanks プロジェクトで報告内容を再現し、PawnTank.h と PawnTank.cpp に焦点を当てながら、cpptools.srv のメモリ使用量と PCH キャッシュの再生成を監視します。hover lookup 中、PawnTank.cpp を閉じたとき、および再度開いたときの動作を比較します。lookup によって過剰なメモリ使用が発生せず、PCH が不必要に再生成されなければ完了です。