The differences in Window/Unix

http://www.linuxinsider.com/story/33089.html
By Paul Murphy
LinuxInsider

That difference in design philosophy shows up everywhere. In memory management, for example, Windows NT 5.0 and its successors use clustered paging, a working set memory analogue and a free memory manager that fires up exactly once per second, while Unix uses an adaptive page specific algorithm -- often least-recently used -- to control paging. In Unix, there is no working set equivalent, and the free memory manager runs when needed.