G - Physics – 06 – F
Patent
G - Physics
06
F
354/233
G06F 15/16 (2006.01) G06F 9/46 (2006.01) G06F 15/17 (2006.01) G06F 15/173 (2006.01)
Patent
CA 1291827
ABSTRACT In a multiprocessor system, where in each local group a processor and its local memory are included, and the local memory is accessed from the either processor in the same group or other group through a communication media, the system according to the present invention is provided with a LOCK flag, a SYNC flag and a control circuit for controlling accesses to the own memory from the own processor and the other group's processor depending on the status of the flags. The LOCK flag inhibits a reading-out the memory from other processor while the own processor is writing therein. The SYNC flag permits reading-out the memory from other processor and inhibits the own processor to write therein. A read request as well as a write request to the memory from the processors are inputted to the control circuit which control to convey the requests to the memory. Thus, the flag setting/resetting is carried out within a group, therefore, the synchronization software which requires much of overhead, or control lines which interconnects the processors are not necessary, resulting in accomplishment of a reduced network traffic, that is, a high-speed multiprocessor operation.
542012
Fetherstonhaugh & Co.
Fujitsu Limited
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