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$ time ./rtoa-pgatram-fixed t1.txt t1.txt t1.txt t1.txt >f.tmp
read_input_files  : 15996000 items
...
$ cksum f.tmp p.tmp
737201628 75552000 f.tmp
737201628 75552000 p.tmp

   // Convert roman to decimal
   cstart2 = high_resolution_clock::now();
...
   
   double ctaken = elaspe_time(cend2, cstart1);
   std::cerr << "total time        : " << std::setw(8) << ctaken   << 
+" secs\n";

$ time ./rtoa-pgatram-fixed2 t1.txt t1.txt t1.txt t1.txt >f.tmp
read_input_files  : 15996000 items
...
real    0m0.799s
user    0m15.147s
sys     0m0.131s

# https://perlmonks.org/?node_id=11152168 max_workers => 21
$ time perl rtoa-pgatram-mce.pl t1.txt t1.txt t1.txt t1.txt >p.tmp
...
real    0m0.502s
user    0m13.732s
sys     0m0.246s