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PDL 2.021: perl -d:NYTProf demo_win.pl 1e7  # 5.238 secs.
PDL 2.079: perl -d:NYTProf demo_win.pl 1e7  # 9.511 secs.

Calls  P  F  ExTime  InTime  Subroutine
61776  1  1   186ms   186ms  File::Which::CORE::regcomp (opcode)
...
61776  1  1  15.9ms  15.9ms  File::Which::CORE:match (opcode)
 5616  1  1   800µs   800µs  File::Which::CORE:fteexec (opcode)
 5148  1  1   668µs   668µs  File::Which::CORE:ftis (opcode)

File::Map 0.67
MCE 1.878

use strict;
use warnings;
...
}

say {*STDERR} time - $t;

$PDL::BIGPDL = 1;
PDL 2.021: perl test.pl 2e6  # 4.590 secs.
...
PDL 2.021: perl test.pl 2e6  # 4.490 secs.
PDL 2.079: perl test.pl 2e6  # 5.252 secs.