[llvm-dev] Limit clangd ram and processor usage

[Deep Majumder via llvm-dev]

Hi everyone,

I use clangd in Neovim (and CoC). Now the thing is that clangd while working on llvm source code peaks CPU usage on 4 cores. The RAM usage spikes to about 3gb. Is there a way to limit this?

Warm regards,

Deep

[Nathan James via llvm-dev]

Hi Deep,

Does your system use glibcs ptmalloc2(most linux systems do). If that
is the case, there was an issue with the allocation patterns used in
clangd causing arenas to continuously grow. This has been addressed in
the upcoming clangd-12 release. If that's not the case, would you
consider filing a bug report at https://github.com/clangd/clangd/issues
please.

~
Nathan James

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[Deep Majumder via llvm-dev]

HI Nathan,

How do I ascertain that I have ptmalloc2 on my system (I am on Ubuntu 20.04 btw).

The file /usr/include/malloc.h is not the same as the file at https://github.com/emeryberger/Malloc-Implementations/blob/master/allocators/ptmalloc/ptmalloc2/malloc.h (this is the version of ptmalloc2 I found online).

Warm regards,

Deep

[Sam McCall via llvm-dev]

Hi Deep,

If you're running a relatively standard linux system such as ubuntu then you're using the platform-standard glibc malloc which was affected by this bug.

If you're using the 11 release or earlier i'm fairly sure the bug Nathan mentioned is the cause.

In that case, can you try https://github.com/clangd/clangd/releases/tag/12.0.0-rc2 (or building from source, or downloading one of the LLVM 12 RC binary releases)?

Cheers, Sam

[Deep Majumder via llvm-dev]

Thank you Sam and Nathan! This has solved the memory build up problem.

Warm regards,

Deep