This all depends on how much you are exactly storing in your hash tables, but this code should give you a hint, just run it and watch top or some other resource monitor:
#!perl -w
use strict;
$|=1;
my (%a,%b,%c);
for (0 .. 500_000) { # set higher if you dare
$a{$_} = "x" x 60; # 60 character string
$b{$_} = "x" x 60;
$c{$_} = "x" x 60;
print "\rrow $_" unless $_ % 10000;
}
note: this goes up to 190 mb for about 500_000 iterations on my machine YMMV.
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