Betekenis van:
virtual memory

virtual memory
Zelfstandig naamwoord
    • (computer science) memory created by using the hard disk to simulate additional random-access memory; the addressable storage space available to the user of a computer system in which virtual addresses are mapped into real addresses




    1. Almost all implementations of virtual memory divide the virtual address space of an application program into pages; a page is a block of contiguous virtual memory addresses.
    2. Virtual memory is a memory management technique developed for multitasking kernels.
    3. By 1969 the debate over virtual memory for commercial computers was over. An IBM research team led by David Sayre showed that their virtual memory overlay system consistently worked better than the best manually controlled systems.
    4. Some systems, such as Burroughs B5500, do not use paging to implement virtual memory. Instead, they use segmentation, that divide virtual address spaces into variable-length segments. A virtual address consists of a segment number and an offset within the segment.
    5. Pages are usually at least 4 KiB (4×1024 bytes) in size, and systems with large virtual address ranges or large amounts of real memory generally use larger page sizes.