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70114Re: Some performance figures for the new regexp engine

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  • Bram Moolenaar
    May 25, 2013
      Glts wrote:

      > there is simple but straightforward "Benchmark of Regex Libraries" at
      > http://lh3lh3.users.sourceforge.net/reb.shtml
      > I measured search durations for both regexp engines in Vim 7.3.1010,
      > using the same regular expressions and the same data they used. I added
      > one simpler test, which is listed in the final column ("Word") below.
      > Please refer to that web site for more information.
      > URI Email Date Sum3 URI|Email Word
      > re=1 16.34 13.65 4.07 34.06 29.46 0.49
      > re=2 92.03 9.75 4.47 106.25 105.39 5.22
      > Python 2.7.3 2.69 5.17 1.01 8.87 7.72 3.40
      > Perl 5.14.2 0.35 0.33 0.32 1.00 8.12 0.31
      > GNU egrep 2.10 0.21 0.16 0.56 0.93 10.86 0.03
      > The figures (in s) are averages of five runs each, on Linux, 64-bit
      > i7-2700K CPU @ 3.50GHz x 8. (The Python, Perl, and egrep figures are
      > just for comparison with the original benchmark.)
      > I made a gist with the necessary materials here:
      > https://gist.github.com/glts/5646749

      Interesting and useful. Since using short text there will be quite a
      bit of overhead from executing the regexp though.

      Did you also check for correctness? It's easy to make a regexp engine
      that's fast but wrong. And do they possibly run out of memory and
      crash? I rewrote the original Vim regexp engine to be iterative instead
      of recursive to handle that.

      I need some tests to do profiling, I could perhaps use some of this.

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