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$ for i in $(seq 1 210); do cat large.txt; done >/tmp/big.txt
$ ls -lh /tmp/big.txt 
-rw-r--r-- 1 mario mario 5.0G May 19 11:19 /tmp/big.txt

$ time grep -c "[aA].*[eE].*[iI].*[oO].*[uU]" /tmp/big.txt 
2195760
...
real    0m8.721s
user    0m8.317s
sys     0m0.404s

$ time ./egrep.pl --max-workers=2 -c "[aA].*[eE].*[iI].*[oO].*[uU]" /t
+mp/big.txt 
2195760
...
real    0m39.068s   0m16.088s   0m8.146s    0m4.229s    0m3.084s
user    1m17.614s   1m19.624s   1m20.441s   1m21.823s   1m25.296s
sys     0m0.419s    0m0.464s    0m0.434s    0m0.526s    0m0.645s

$ time NUM_THREADS=2 ./grep-count-pcre2 "[aA].*[eE].*[iI].*[oO].*[uU]"
+ /tmp/big.txt
parallel (2) Total Lines: 105000000, Matching Lines: 2195760
...
real    0m9.256s    0m4.382s    0m2.748s    0m1.929s    0m1.689s
user    0m15.858s   0m16.563s   0m17.267s   0m18.391s   0m19.497s
sys     0m1.678s    0m1.339s    0m1.186s    0m1.225s    0m1.260s

$ time NUM_THREADS=2 ./grep-count-pmap "[aA].*[eE].*[iI].*[oO].*[uU]" 
+/tmp/big.txt
parallel (2) Total Lines: 105000000, Matching Lines: 2195760
...
real    0m8.113s    0m3.249s    0m1.675s    0m0.958s    0m0.707s
user    0m15.333s   0m15.646s   0m15.809s   0m16.775s   0m18.110s
sys     0m0.840s    0m0.266s    0m0.343s    0m0.489s    0m0.506s

$ time NUM_THREADS=2 ./grep-count-chunk "[aA].*[eE].*[iI].*[oO].*[uU]"
+ /tmp/big.txt
parallel (2) Total Lines: 105000000, Matching Lines: 2195760
...
real    0m8.017s    0m3.257s    0m1.537s    0m0.801s    0m0.618s
user    0m14.524s   0m14.997s   0m14.906s   0m15.397s   0m17.519s
sys     0m1.010s    0m1.019s    0m0.412s    0m0.515s    0m0.649s

// Grep PCRE2 and Chunking C++ OpenMP demonstration for website:
//    https://cpufun.substack.com/p/processing-a-file-with-openmp
...

   return 0;
}