- noun a configuration or program fault in a virtual memory system that results in a CPU wasting time moving pages of data between main memory and disk or backing store
- A state in which computer processes or tasks progress very slowly or not at all. This may occur, for instance, when an operating system is having difficulties in allocating resources for one program, and when accomplished, creates limitations in another program, which starts another such cycle. 2. Thrashing (1) due to excessive paging in and out of memory.