Performance issue debug

[kdelchev]

• Category
  • [x] Question
• OS
  • [x] Mac OS X
• Vim
  • [x] Vim

I possibly have an issue with fzf. See the question I opened here and related comments. Here is attached profile file created with debugging steps.

The issue is with the preview - it's loading too slow for me. Using the minimum configuration provided the preview is not working at all. I have installed fzf and vim-fzf with recommended steps and have vim-plug as plugin manager. Also I am using oh-my-zsh. Here is my config. And my .vimrc so far.

[edi9999]

The default command run by fzf is :

`find . -path '*/\.*' -prune -o -type f -print -o -type l -print 2> /dev/null | sed s/^..//`

Maybe, this is slow because you have many files in your folder that you are not interested in (.git files, others).

One good alternative is :

export FZF_DEFAULT_COMMAND='ag -g ""'

(You have to put this in your .zshrc)

(See https://github.com/junegunn/fzf/tree/c39c039e155c50bcf8fecc5956c4bdd3b5c6bea1#environment-variables )

You have to install ag (the_silver_searcher)

[kdelchev]

I tried the default command like this

time (find . -path '*/\.*' -prune -o -type f -print -o -type l -print 2> /dev/null | sed s/^..//)

and it finishes quite fast 0.04s user 0.04s system 92% cpu 0.087 total. The delay I have in vim is about 6.7 seconds according to the profiled result. A colleague of mine is having the same config and running the plugin with the preview is instant. The only difference is rbenv (I am using rvm).

[edi9999]

How many files are appearing after 6.7 seconds in vim ?

[edi9999]

What if you run your time command from with vim ?

Like this in vim

:!time (find . -path '*/\.*' -prune -o -type f -print -o -type l -print 2> /dev/null | sed s/^..//)

[kdelchev]

The files are 5057. They load below 1 second after running :Files. The preview is taking a lot before shows the file preview. If I switch to another file the preview is delayed. There is also syntax in the preview. Could it be the syntax? How can I turn it off?

The above command in vim is running quite fast: 0.05s user 0.07s system 104% cpu 0.107 total

[edi9999]

I see that in your dotfiles : https://github.com/kdelchev/.vim/blob/master/.vimrc#L59

You are doing :

let g:fzf_files_options =
  \ '--preview "(coderay {} || cat {}) 2> /dev/null | head -'.&lines.'"'

Maybe this is too slow, try disabling it for now to be sure it comes from that

[kdelchev]

I do this as described here: https://github.com/junegunn/fzf.vim#command-local-options

Disabled now - no preview at all.

[edi9999]

And is this faster ?

[edi9999]

How do you run FZF ? Do you type :FZF ?

[kdelchev]

Its the same, but the issue is not that. I maybe was not clear. It is the preview which is slow. I type :Files. There is no preview with :FZF.

[edi9999]

Ok, I understand now. So probably the command coderay filename is slow to run for some kinds of files ?

[edi9999]

I think you should try to reproduce the issue with a simple file (eg show that time coderay filename is slow for some kinds of files, and probably report this bug report to coderay)

[kdelchev]

You are right. Looks like its coderay issue: time (coderay README.md)

1.61s user 0.11s system 99% cpu 1.735 total

I get the same result for all kind of files rb, erb etc.

Thanks a lot for the help.

[edi9999]

I personnaly just use "head -n 30 {}" as my preview argument, it is extremely fast and does the job well (but they is no coloring of course)

[kdelchev]

Perfect! I do the same now. I dont care about colors.

Thanks again.

[junegunn]

@edi9999 Thanks for looking into this.

@kdelchev It is probably an issue of your RVM installation. CodeRay for me is sufficiently fast.

wc -l README.md; time coderay README.md > /dev/null
     413 README.md

real    0m0.053s
user    0m0.042s
sys     0m0.010s

[kdelchev]

I can confirm the issue was with my rvm installation. Moved to rbenv - no performance issues now. Thanks again for the help.