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#!perl -w
use strict;
...
    'tr_via_readline 1m' => \&tr_via_readline_1_000_000,
}
);

X:\>perl -w tmp.pl
Running with a dataset of 200000000
...
tr_via_readline 1m   2.61/s                 20%                   2%  
+               --        -66%         -72%
tr_map_file          7.60/s                249%                 198%  
+             191%          --         -18%
tr_in_memory         9.25/s                325%                 263%  
+             254%         22%           --

                     s/iter tr_via_readline 10k tr_via_readline 100k t
+r_via_readline 1m tr_map_file tr_in_memory
tr_via_readline 10k    4.61                  --                 -15%  
+        -17%        -65%         -77%
...
tr_via_readline 1m     3.83                 20%                   2%  
+          --        -58%         -72%
tr_map_file            1.60                189%                 145%  
+        140%          --         -32%
tr_in_memory           1.08                327%                 262%  
+        255%         48%           --