Perpetual notifications with 100% CPU & RAM usage

[ppelikan]

Hello,

I am constantly seeing this distracting message with animation:

When clicked, there are multiple notifications:

Steps to reproduce:

1. Open one or more Nim source code file in VS Code
2. Observe CPU usage jump to 100% (caused by multiple nimsuggest processes)
3. After few minutes CPU usage drops, and the never-ending notification appears.

Apparently, the time of high CPU consumption depends on how big the import'ed codebase is in the project we open, but it's hard for me to say that for sure.

Also sometimes I get OOM error - all RAM is being taken when working with this setup.

My setup

Laptop:
OS: Manjaro Linux x86_64
Kernel: 6.12.19-1-MANJARO
CPU: Intel i5-9400H (8 cores, 16 threads)
RAM: 32GB

Nim:
Nim Compiler Version 2.2.2 [Linux: amd64] Compiled at 2025-02-06 git hash: 6c34f62785263ad412f662f3e4e4bf8d8751d113
nimlangserver 1.10.0

I have installed nim via choosenim, and manually downloaded release build of nimlangserver from github.

nim-lang.org VS Code plugin - latest version (2025-03-19, 13:00:10).

The only plugin settings I have, is:
"nim.lintOnSave": true,
Setting the "nim.project" or removing it, doesn't influence the problem.

[RokkuCode]

The nimlangserver has problems when using with choosenim: nim-lang/langserver#184

But without using choosenim the problem exists, too.

[ppelikan]

Yes, I had much more problems, when I allowed vscode-nim extenstion to automatically install the nimlangserver. (First, it tried to build it from source instead of getting binaries)

So I just:

1. downloaded the built release from langserver/releases
2. then placed the executable in the ~/.nimble/bin/ directory (same directory, where nim is installed, but any PATH dir should work as I assume)

In this configuration, it behaves similarly to when I installed Nim with system package manager (on my previous PC) and this very problem occurs.

[RokkuCode]

yes thats right. I have the same problems. please enable in the vscode nim extension setting "nimlangserver > trace: server" to verbose and post the informations from "output" (there is a filter dropdown in the output panel "nim lsp". then you should see the messages)

[1c3c0l4]

I run into the same problem on Windows 11. The vscode plugin creates many nimsuggest process and takes almost 100% cpu and memory. I have to kill all the nimsuggest process regularly. This makes a really bad experience.

[xix-xeaon]

I also have the problem with lots of nimsuggest processes and extreme RAM usage (and CPU). My project (which isn't even big in any sense) is becoming too large to open unless I close everything else down first. Or, suddenly the computer freezes because I ran out of RAM as nimsuggest has been slowly growing and is now over 10 GB, which is insanely crazy.

However, I've had the most wonderful experience this past week! There was a "communication" error or something and the extension failed to start any nimsuggest processes and hasn't tried again. Some features are missing but I had nim check on save enabled and I'm not missing anything else nearly as much as I enjoy not having to deal with OOM issues.

Please add a setting to completely disable nimsuggest!