# https://perlmonks.org/?node_id=11152156
$ ./rtoa-pgatram-fixed t1.txt t1.txt t1.txt t1.txt | cksum
read_input_files  : 15996000 items
read file time    :    0.356 secs
roman_to_dec time :    0.460 secs
output time       :    0.124 secs
total time        :    0.941 secs
737201628 75552000

# https://perlmonks.org/?node_id=11152177
$ NUM_THREADS=4 ./rtoa-pgatram-openmp t1.txt t1.txt t1.txt t1.txt | cksum
use OpenMP
read_input_files  : 15996000 items
read file time    :    0.159 secs
roman_to_dec time :    0.469 secs
total time        :    0.628 secs
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# https://perlmonks.org/?node_id=11152182
$ ./rtoa-pgatram-allinone t1.txt t1.txt t1.txt t1.txt | cksum
do_it_all time    :    0.637 secs
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# https://perlmonks.org/?node_id=11152186
$ ./rtoa-pgatram-allinone2 t1.txt t1.txt t1.txt t1.txt | cksum
do_it_all time    :    0.515 secs  fast_io scan, line_get
do_it_all time    :    0.490 secs  fast_io memory mapping
737201628 75552000