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  1. or download this
    sub mem {
    print "$_[0]:\n";
...
mem("before");
$tests{$what}->($n);
mem("after");
  2. or download this
    $ ./883539.pl iter_flat         
before:
...
after:
   SZ    VSZ
2571632 2593056           #  map needs 1.7 times as much