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virtual storage (VS)

A virtual memory( VS) is a memory concept that has a uniform address space. These are programmatically simulated, i.e. apparent memory addresses, which the system user can treat as real memory addresses. This address space includes the memory space of the main memory and the mass memory.

Since programs that work with virtual memory use virtual addresses, while main memory works with physical addresses, the virtual address used must be converted into a physical address. This is referred to as address resolution in this context. By mapping the virtual memory to the physical memory, the computing speed is slowed down. The situation is different with physical memory, which programs process directly from RAM.

A virtual memory is replicated by an area on the hard disk. This area can be used by the operating system like normal RAM with the lower access times for hard disks. The virtual memory space is used to swap out files that are not immediately needed, the swap files. It is used when the semiconductor RAM is insufficient to load all the modules required for a program, which could reduce the performance of the computer. Virtual Storage (VS) is also the name for an IBM operating system for virtual storage. The VS operating system is the predecessor of OS/ MVS and successor of OS/ MVT.

Englisch: virtual storage - VS
Updated at: 26.01.2020
#Words: 218
Links: virtual, memory, virtual scheduling (ATM) (VS), address space (AS), system
Translations: DE

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