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use v5.030;

...
    MCE::relay { print $output; };
  }
)->run;

$ time perl test.pl > out  # 17GB ~ 19GB file size

...

$ wc -l out
1000000000

# Sorting consumes 17GB ~ 19GB temporary space.
# Specify a path with sufficient storage.
...
Math::Random::random_uniform  . .   799455502
Math::Random::MT::Auto::rand  . .   999999527
$prngMT->rand . . . . . . . . . .   999999527