Thrashing (computer science)
Constant exchange between memory and storage
In computer science, thrashing occurs in a system with memory paging when a computer's real memory (RAM) resources are overcommitted, leading to a constant state of paging (swapping, i.e. moving a page to disk) and page faults, slowing most application-level processing. This causes the performance of the computer to degrade or even collapse.
From Wikipedia, under CC BY-SA. More on occurri.