Re: Vim hangs and consums 24% of CPU

Am 2015-07-02 03:14, schrieb wolfv:
> This is a weird bug.
>
> When the attached test_vim.txt file is opened in Vim, and scrolled
> down to line 372, Vim hangs and consumes 24% of CPU.
> This only happens with the attached vimrc and test_vim.txt. All other
> files I tried work nice with the attached vimrc.
>
> The test_vim.txt file works nice if it is:
>
> * opened in less
>
> * opened in vi
>
> * opened in Vim with the last 7 lines of the attached vimrc commented
>
> The test_vim.txt file also works nice if a blank line is inserted on
> line 372 like this:
>
> FILE_CONTENT FILE_CONTENT FILE_CONTENT
>
>
> http://www.linux4windows.com/Articles/linux_concepts_for_beginners5.html
>
> The attached test_vim.txt file is 504 lines long.
> I have reproduced the bug by copying lines 360 to line 375 into a new
> file, but it only hangs for a couple seconds. And does not hang if
> the last 7 lines of the vimrc are commented.
>
> I am running Vim version 7.4.6.40 on Linux Fedora 22 on hardware
> Haswell Intel NUC Kit D54250WYK.
>
> Thank you.

1) Try to reproduce according to the description here:
http://vimhelp.appspot.com/vim_faq.txt.html#faq-2.5

2) I suspect, markdown syntax highlighting is causing this problem for
you.
(since it goes away, if you disable setting the filetype)
You can check with the :syntime command, which pattern is slow
(see :h :syntime) and also you might want to try to switch to the old
re-engine (:set re=1 see :h two-engines), to see if this makes a
difference.
If this is the case, contact the maintainer of the markdown syntax file.
He can likely assist on how to proceed and hopefully fix the syntax
file.

Best,
Christian

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