I was just wondering if anyone had done any research into the overhead associated with lists and hashes in Perl. This question arises as i was just building and array in perl, and found my memory climbing to over 100 meg, when the output of that array takes up 30 meg in a file! Now, this could be because the array had numerous small items, namely about 1.6 million entries of 30 or so bytes each. Is this all overhead? and generally , what overhead can be expected with lists? Is it constant to how many items you have + size of items? Thank you for any wisdom you can shed. (I don't think i have any mem leaks, i took out the array push and mem usage dropped to 2 meg)