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70497Re: Patch 7.3.10

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  • Dominique PellĂ©
    Jun 2, 2013
    • 0 Attachment
      Bram Moolenaar wrote:

      > Syntax highlighting of XML with long lines is a lot faster now.

      Hi

      I was hoping for faster xml syntax highlighting after reading
      the above comment, but using :set regexpengine=1 (old engine)
      is much faster than :set regexpengine=0 (automatic engine).

      Here is a comparison using vim-7.3.1090 (big) on Linux x86_64:

      1/ download this xml file:

      $ wget http://svn.code.sf.net/p/languagetool/code/trunk/languagetool/languagetool-language-modules/fr/src/main/resources/org/languagetool/rules/fr/grammar.xml

      2/ create a simple ~/.vimrc

      $ cat ~/.vimrc
      set nocompatible
      set regexpengine=1
      filetype on
      filetype plugin on
      syntax on

      3/ measure (using old regexp engine):

      $ time vim -c ':norm G' -c ':redraw|q' grammar.xml
      real 0m3.511s
      user 0m3.444s
      sys 0m0.052s


      4/ change "set regexpengine=1" into "set regexpengine=0" in ~/.vimrc

      5/ measure the same command again (using new regexp engine):

      $ time vim -c ':norm G' -c ':redraw|q' grammar.xml

      real 0m16.429s
      user 0m16.117s
      sys 0m0.256s

      So in this xml example, it's x4.7 slower with the new
      regexp engine. Is this expected?

      The grammar.xml file contains a few long lines. Here is the
      length of the 5 longest lines:

      $ perl -ne 'print length($_), "\n"' < grammar.xml | sort -n | tail -5
      812
      924
      1217
      1343
      2312

      Regards
      Dominique

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