x32 mode can be a huge win if your data structures contain lots of pointers&#x2F;references. It can shrink the memory usage and speed up computation by surprising amounts (compared to running the same process in a &#x27;full&#x27; 64 bit mode). It&#x27;s not just for when you are writing your own intricate code, either. An x32 build of perl sped up some of my programs dramatically, and let me run stuff on a 4GB machine that previously couldn&#x27;t fit the data in.<p>Ubuntu has some x32 packages available for their standard 64 bit distribution, but the selection is limited.