>The memory size argument never really made sense to me; there just aren't that many ints in the average program.
If you have a structure of just 5000 ints (which I imagine is fairly common), the difference between ILP64 and LP64 is the difference between your data fitting into the L1 cache and some of your data being pushed out into the L2 cache. In a thight loop that can be a big difference.
If you have a structure of just 5000 ints (which I imagine is fairly common), the difference between ILP64 and LP64 is the difference between your data fitting into the L1 cache and some of your data being pushed out into the L2 cache. In a thight loop that can be a big difference.