[Bug 223532] GNU egrep -i is terrible slow if utf-8 locale is enabled

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223532

Helge Oldach <freebsd@oldach.net> changed:

           What    |Removed                     |Added
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                 CC|                            |freebsd@oldach.net

--- Comment #3 from Helge Oldach <freebsd@oldach.net> ---
(In reply to Wolfram Schneider from comment #2)
Hmm. I have noticed that as well. I suspect it's a fallout of bug #253209, as I
noticed it was much more slowly after that fix.

However, I'm seeing the vast majority of slowdown with other locales but utf-8
as well:

root@nuc ~ # grep -V
grep (BSD grep, GNU compatible) 2.6.0-FreeBSD
root@nuc ~ # time fgrep zpipe /usr/ports/INDEX-13
        0.28 real         0.15 user         0.06 sys
root@nuc ~ # time fgrep -i zpipe /usr/ports/INDEX-13
       13.87 real        13.86 user         0.00 sys
root@nuc ~ # LANG=en_US.UTF-8 time fgrep -i zpipe /usr/ports/INDEX-13
       17.67 real        17.65 user         0.01 sys
root@nuc ~ # LANG=C.UTF-8 time fgrep -i zpipe /usr/ports/INDEX-13
       17.63 real        17.59 user         0.02 sys
root@nuc ~ # LANG=en_US.iso8859-1 time fgrep -i zpipe /usr/ports/INDEX-13
       13.97 real        13.95 user         0.02 sys
root@nuc ~ # LANG=C time fgrep -i zpipe /usr/ports/INDEX-13
       14.00 real        13.97 user         0.03 sys
root@nuc ~ #

To summarize, "-i" adds two (!) orders of magnitude, and changing to a
multibyte character set adds some more 33% further on top.

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