fgrep-problem-benchmarks.log

----- CAT


real	0m0.070s
user	0m0.007s
sys	0m0.063s

----- WC

12032690 _tmp/all-10.txt

real	0m0.213s
user	0m0.156s
sys	0m0.057s

----- FGREP


real	0m0.027s
user	0m0.023s
sys	0m0.003s

----- GREP


real	0m0.021s
user	0m0.015s
sys	0m0.006s

----- RIPGREP


real	0m0.820s
user	0m0.788s
sys	0m0.031s
0

----- read:count-lines

num_lines = 0
num_bytes = 353423380

real	0m0.118s
user	0m0.077s
sys	0m0.041s

----- read:re2c-match

num_lines = 1
num_keywords = 0
nothing = 0
num_bytes = 353423380

real	0m0.428s
user	0m0.410s
sys	0m0.017s

----- mmap

num_lines = 12032690
num_keywords = 3830430
nothing = 0

real	0m1.315s
user	0m1.287s
sys	0m0.027s
num_matches = 3830430
num_bytes = 353423380

real	0m2.211s
user	0m2.042s
sys	0m0.168s

Please do a git pull and try the following.

I just exposed the COUNT_RESULTS variable to test if they return the same number of matches. This requires LC_ALL=C on my machine.

$ COUNT_RESULTS=1 ./fixed-strings.sh grep-fixed-benchmark 

FGREP number of results
2969020

----- FGREP


real    0m1.469s
user    0m1.412s
sys     0m0.029s

GREP number of results
2969020

----- GREP


real    0m1.131s
user    0m1.076s
sys     0m0.056s

RIPGREP number of results
2969020

----- RIPGREP


real    0m0.975s
user    0m0.930s
sys     0m0.029s
0