ycm-core
Constant high CPU usage
Issue Prelude
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Issue Details
Provide a clear description of the problem, including the following key questions:
On M1 Macbook Air, the Terminal app, not the vim process, has constant high CPU usage for each opened C++ file, including new files that don't exist.
With 3 new empty C++ files opened, the Terminal app takes 30+% CPU usage constantly, even when there's no input/action to vim. Currently I only found this problem with C++ files and with YCM enabled. The problem disappears if no C++ file is opened(e.g. only .py files) with YCM enabled, or C++ files are opened with disabled YCM, both takes 0.0% CPU usage.
With actual C++ files with complicated source code opened, even higher CPU usage is taken for each file and heats the computer constantly.
- What did you do?
Include steps to reproduce here.
vim -Nu vimrc_ycm_minimal test1.cpp test2.cpp test3.cpp -O, no.cppfiles have to exist.- Check CPU usage , no editing is needed.
If you made changes to
vimrc_ycm_minimal, pase them here:
No change is made.
-
What did you expect to happen? Don't take high CPU usage when idle.
-
What actually happened? Terminal app takes high CPU usage constantly.
Diagnostic data
Output of vim --version
VIM - Vi IMproved 9.1 (2024 Jan 02, compiled Jun 18 2024 19:01:23)
macOS version - arm64
Included patches: 1-500
Compiled by Homebrew
Huge version without GUI. Features included (+) or not (-):
+acl +file_in_path +mouse_urxvt -tag_any_white
+arabic +find_in_path +mouse_xterm -tcl
+autocmd +float +multi_byte +termguicolors
+autochdir +folding +multi_lang +terminal
-autoservername -footer -mzscheme +terminfo
-balloon_eval +fork() +netbeans_intg +termresponse
+balloon_eval_term +gettext +num64 +textobjects
-browse -hangul_input +packages +textprop
++builtin_terms +iconv +path_extra +timers
+byte_offset +insert_expand +perl +title
+channel +ipv6 +persistent_undo -toolbar
+cindent +job +popupwin +user_commands
-clientserver +jumplist +postscript +vartabs
+clipboard +keymap +printer +vertsplit
+cmdline_compl +lambda +profile +vim9script
+cmdline_hist +langmap -python +viminfo
+cmdline_info +libcall +python3 +virtualedit
+comments +linebreak +quickfix +visual
+conceal +lispindent +reltime +visualextra
+cryptv +listcmds +rightleft +vreplace
+cscope +localmap +ruby +wildignore
+cursorbind +lua +scrollbind +wildmenu
+cursorshape +menu +signs +windows
+dialog_con +mksession +smartindent +writebackup
+diff +modify_fname +sodium -X11
+digraphs +mouse +sound -xattr
-dnd -mouseshape +spell -xfontset
-ebcdic +mouse_dec +startuptime -xim
+emacs_tags -mouse_gpm +statusline -xpm
+eval -mouse_jsbterm -sun_workshop -xsmp
+ex_extra +mouse_netterm +syntax -xterm_clipboard
+extra_search +mouse_sgr +tag_binary -xterm_save
-farsi -mouse_sysmouse -tag_old_static
system vimrc file: "$VIM/vimrc"
user vimrc file: "$HOME/.vimrc"
2nd user vimrc file: "~/.vim/vimrc"
3rd user vimrc file: "~/.config/vim/vimrc"
user exrc file: "$HOME/.exrc"
defaults file: "$VIMRUNTIME/defaults.vim"
fall-back for $VIM: "/opt/homebrew/share/vim"
Compilation: clang -c -I. -Iproto -DHAVE_CONFIG_H -DMACOS_X -DMACOS_X_DARWIN -g -O2 -D_REENTRANT -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: clang -o vim -lm -lncurses -lsodium -liconv -lintl -framework AppKit -L/opt/homebrew/opt/lua/lib -llua5.4 -mmacosx-version-min=14.2 -fstack-protector-strong -L/opt/homebrew/opt/perl/lib/perl5/5.38/darwin-thread-multi-2level/CORE -lperl -L/opt/homebrew/opt/[email protected]/Frameworks/Python.framework/Versions/3.12/lib/python3.12/config-3.12-darwin -lpython3.12 -framework CoreFoundation -lruby.3.3 -L/opt/homebrew/Cellar/ruby/3.3.3/lib
Output of YcmDebugInfo
Printing YouCompleteMe debug information...
-- Resolve completions: Up front
-- Client logfile: /var/folders/kz/4wgytmy56ks64tslrymmc0vw0000gn/T/ycm_86u_2o90.log
-- Server Python interpreter: /opt/homebrew/opt/[email protected]/bin/python3.12
-- Server Python version: 3.12.4
-- Server has Clang support compiled in: False
-- Clang version: None
-- No extra configuration file found
-- C-family completer debug information:
-- Clangd running
-- Clangd process ID: 32966
-- Clangd executable: ['/Users/namniav/.vim/plugged/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin/clangd', '-header-insertion-decorators=0', '-resource-dir=/Users/namniav/.vim/plugged/Y
ouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/17.0.1', '-limit-results=500', '-log=verbose']
-- Clangd logfiles:
-- /var/folders/kz/4wgytmy56ks64tslrymmc0vw0000gn/T/clangd_stderr_3cfrw33.log
-- Clangd Server State: Initialized
-- Clangd Project Directory: /Users/namniav/.vim/plugged/YouCompleteMe
-- Clangd Open Workspaces: {'/Users/namniav/.vim/plugged/YouCompleteMe'}
-- Clangd Settings: {}
-- Clangd Compilation Command: False
-- Server running at: http://127.0.0.1:62916
-- Server process ID: 32964
-- Server logfiles:
-- /var/folders/kz/4wgytmy56ks64tslrymmc0vw0000gn/T/ycmd_62916_stdout_33v86uc8.log
-- /var/folders/kz/4wgytmy56ks64tslrymmc0vw0000gn/T/ycmd_62916_stderr_jrmf0b2z.log
-- Semantic highlighting supported: True
-- Virtual text supported: True
-- Popup windows supported: True
Output of YcmDiags
No warnings or errors detected.
Output of git rev-parse HEAD in YouCompleteMe installation directory
b5fe27bb82cc375d66a9a006cf30390bdb215ed2
Contents of YCM, ycmd and completion engine logfiles
Reproduce the issue with
vim -Nu /path/to/YCM/vimrc_ycm_minimal, which enabled debug logging and other useful diagnostics. Include a link to a [gist][] containing all of the log files listed by:YcmToggleLogs. clangd_stderr_3cfrw33.log ycm_86u_2o90.log ycmd_62916_stderr_jrmf0b2z.log ycmd_62916_stdout_33v86uc8.log
OS version, distribution, etc.
M1 Macbook Air, macOS 14.1 (23B74)
I can't reproduce.
From the logs I can see that YCM is making the expected (small) number of server message polls
YCM has a few timers that fire every ~100ms in normal mode and ~10ms in insert mode, but these callbacks are very light.
Do we know it's vim/ycmd? Considering clangd in the debug info, I bet this is just clangd indexing a big repo which is resuling in a long high cpu load.
For LLVM I needed a few hours for clangd to index everything. After that, it was smooth sailing.
@puremourning Thank you for investigating the issue.
Did you start vim with -O option to open windows side by side for each file? I noticed that more vim windows(splits) for C++ files, higher constant cpu usage taken by Terminal. Without -O it's about 14% on my side.
I can reproduce the issue stably, is there something else I could try and provide?
Do we know it's vim/ycmd? Considering clangd in the debug info, I bet this is just clangd indexing a big repo which is resuling in a long high cpu load.
No, it's not vim/ycmd/clangd process, but only Terminal taking constant high cpu usage. It's reproducible in any empty directory on my side.
I just restarted macOS and it's lower but still unexpectedly high. It's about 19% with -O and 7.x% without -O.
In directory /tmp:
-
YCM + CPP +
-O:vim -Nu ~/.vim/plugged/YouCompleteMe/vimrc_ycm_minimal test1.cpp test2.cpp test3.cpp -O -
YCM + CPP:
vim -Nu ~/.vim/plugged/YouCompleteMe/vimrc_ycm_minimal test1.cpp test2.cpp test3.cpp -
YCM + PY +
-O:vim -Nu ~/.vim/plugged/YouCompleteMe/vimrc_ycm_minimal test1.py test2.py test3.py -O -
noYCM + CPP +
-O:vim -Nu NONE test1.cpp test2.cpp test3.cpp -O
Edit: The columns of ActivityMonitor are same as your screenshot above: Process Name | %CPU | CPU Time | Threads | Idle Wake-Ups | Kind | %GPU