Norihiro Tanaka wrote:
could you also test below for master and original grep-2.18?
$ yes abcdabc | head -50000000 >../k
$ env LANG=C time -p src/grep abcd.bd ../k
Perhaps, later will be faster.
Yes, grep 2.18 is a bit faster on that benchmark for me; it's about 3.6s
real-time, whereas the master is about 4.2s.
0001-grep-speed-up-by-replacing-incr-to-add-in-x86-and-x8.patch will fix
it. delta2 searching is higher cost than mind2 searching in original
grep-2.18. We need to reduce it for delta2 searching.
Unfortunately it doesn't help for me; it causes the same benchmark to
take about 4.3s real-time. Here, I am talking about the version
resulting from applying the patch in
<http://debbugs.gnu.org/cgi/bugreport.cgi?msg=22;filename=17230.diff;att=1;bug=17230>
to the master.
