A multiprocessor system with a selective amplification of global data.

摘要

In a multiprocessor system having selective global data replication a plurality of processors communicate each with the other through a system bus, each processor is provided with an interface unit for getting access to the system bus and with a local memory accessible by the processor through a local bus, without need of access to the system bus, global data, used by a plurality of processors, are selectively replicated in the local memory of a plurality of processor, but not all of them, and a processor X, to perform an unseverable sequence of global data read-modify-write operations, first get access to the system bus in order to avoid occurrence of deadlocks and data inconsistency and requests the reading of a global data in another unit connected to the system bus and where the requested data may be missing, but once the system bus has been locked performs a read operation in its own local memory, where the requested data is certainly available, whilst the data received through the system bus in ignored.