94.574 Elements of Computer Systems

SCE 574

239

Virtual Memory

äIt is a technique that allows the execution of a process without having to allocate it the memory space that it needs, completely.

äVarious parts of a process are swapped into memory as they become needed during execution.

äAdvantages:

äPrograms can be larger than the size of the physical memory.

ävirtual memory provides a logical view of a memory that is larger than its physical size.

äDemand Paging:

äMost virtual memory systems use paging.

äA page is not swapped into memory until it is needed