This message was sent to the submit@debbugs address with no "Package:" specified in the body. So it ended up on the help-debbugs mailing list rather than bug-grep. I have assigned it to grep and am sending this mail, which will appear on the bug-grep list.
For new reports, either use the bug-grep address, or remember to use Package: grep at the start of the body. They both have identical results. Norihiro Tanaka wrote: > Now grep and awk matchers doesn't waste buffer in case-sensisitive matching. > So I think that we can avoid line-by-line matching for them. > > It enable to speed up case-sensitive matching with grep or awk matcher > without trivial_case_ignore as fast as when with it. > > In bug#16232: >> The following times 2.16, 2.17 and 2.17+patch two ways: >> >> $ yes jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj | head -10000000 > k >> $ for i in 16 17 18; do echo $i; env LC_ALL=en_US.UTF-8 time >> /p/p/grep-2.$i/bin/grep -i foobar k; done >> 16 >> 15.96 real 14.57 user 0.12 sys >> 17 >> 1.13 real 1.07 user 0.06 sys >> 18 >> 1.96 real 1.89 user 0.06 sys >> >> The above search takes more than 70% longer with the proposed patch. > > Therefore, I think 30% slow-down is caused by the line-by-line matching > for them. [See attachment at http://debbugs.gnu.org/16893]
