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  1. or download this
    $s = '0123456789';
printf "%x\n", unpack 'Q', pack 'P', $s
...
# 55fd180fcc60
# 55fd18107f30
  2. or download this
    use strict;
use warnings;
...
Length:  1000000, addresses:      2, user:  0.844, system:  1.063
Length: 10000000, addresses:     70, user: 154.453, system: 253.812