While I am working with nvim, I get occasion periods of 100% cpu stems mostly from the Python subprocess of nvim (some other times it is node). It happens when I do nothing in vim.

I tried to do profiling of vim functions, but nothing came up.

Apperently, the python plugins are: coc-python, leaderF, vim-netranger, ycm(disabled prob), vimspector. They are ordered by likelihood from the most likely to the least.

Is there a good way to debug this?

  • 2
    you may have answers if you disclose which python plugins you are using
    – Mass
    Jun 5, 2020 at 0:29
  • I will examine more carefully the open files and ports in activity monitor.
    – eyal karni
    Jun 5, 2020 at 0:42
  • @eyalkarni please edit your question to include these information, it's easier to spot than in the comments
    – statox
    Jun 5, 2020 at 10:20
  • Are there autocommands setup on CursorHold?
    – D. Ben Knoble
    Jun 5, 2020 at 12:35
  • coc_nvim , gitgutter , ALEEvents, auto_save , gitgutter, airline_ale
    – eyal karni
    Jun 5, 2020 at 20:09

1 Answer 1


You could use that vimspector you have installed (in another instance of vim) to attach to the python process and get a stack trace.

Debugpy supports attach-by-PID so you do something like this:

python -m debugpy --listen localhost:5678 --pid <pid of the spinning process>

Then use vimspector to attach to it, using the simple remote-attach config.

You should then be able to see what it's doing; from the stack trace you could at least identify the errant plugin and report to the maintainer. I hope it's not one of mine ;)

Of course, you could also use pdb or something :)

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