Multi-CPU system having fault monitoring facility

摘要

A multi-CPU system including a fault monitoring facility comprises a plurality of central processing units interconnected through a system bus and sending and receiving data through a plurality of bus interface units inserted in the system bus. A fault monitoring bus in parallel with the system bus is commonly accessed by the bus interface units. A bus interface unit which detects a fault notifies the other bus interface units simultaneously using the fault monitoring bus. Data-originating interface units and data-destination interface units receive fault information of the location and type of fault, which has occurred. Swift recovery from a faulty state is enabled.