If I run N versions of program that occupies 8mb of memory the memory footprint of the code is much less than N*8mb due to shared libraries/memory pages. It's

If I run N versions of program that occupies 8mb of memory the memory footprint of the code is much less than N*8mb due to shared libraries/memory pages. It's a factor, sure. But, one you should weigh with other factors to determine what is best.