I'm not an expert on thread memory fundamentals, but I did find something interesting. If you add the 1M scalars to the array from within the threads, IT WILL gain the memory you seek. I had to reduce the number from 100 to 50, because at 100, it was killed by the kernel.

#!/usr/bin/perl
use threads;
use threads::shared;

my @a : shared;

for (1..10) { 
   sleep 1;
   threads->new(\&foo); 
   }

sleep 1;
system "grep VmSize /proc/$$/status";
<>;

sub foo {

 my $s = " " x 1e6;
   for (1..50) { push @a, $s; }

   print @a . " elements in \@a\n";
}
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