Well I did find something to read it
create a php file with:
<?php
echo system('free');
?>
upload it to your server.
Then run it in your browser
But I can't figure out how to read what it really means.
what I got back was:
total used free shared buffers cached Mem: 6083128 5719164 363964 0 195752 3437780 -/+ buffers/cache: 2085632 3997496 Swap: 14319608 136 14319472 Swap: 14319608 136 14319472