Memory system in a multiprocessor system

Details Memory system in a multiprocessor system Memory system in a multiprocessor system

G - Physics

06

F

354/233

G06F 15/16 (2006.01) G06F 15/06 (1980.01)

Patent

CA 1147474

Abstract of the Disclosure A multiprocessor system the kind in which two or more separate processor modules are interconnected for parallel processing includes two redundant interprocessor buses dedicated exclusively to interprocessor com- munication. Any processor module may send information to any other pro- cessor module by either bus. The multiprocessor system includes a memory system in which the memory of each processor module is divided into four logical address areas user data, system data, user code and system code. The memory system includes a map which translates logical addresses to physical addresses and which coacts with the multiprocessor system to bring pages from secondary memory into primary main memory as required to imple- ment a virtual memory system. The map also provides a protection function. It provides inherent protection among users in a multiprogramming environ- ment, isolates programs from data and protects system programs from the actions of user programs. The map also provides a reference history infor- mation for each logical page as an aid to efficient memory management by the operating system.

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