Apparatus for controlling a multi-processor system, scalable node, scalable multi-processor system, and method of controlling a multi-processor system

摘要

An apparatus for controlling a multi-processor system comprises: a plurality of local ports that holds a data request made from the node; a local snoop unit that performs a local snoop on the requests held in the local ports; a broadcast queue that broadcasts the request to the other nodes when the local snoop fails to process requested data; a plurality of global ports that hold requests broadcast from the other nodes; a global snoop unit that performs a global snoop on the requests held in the global ports; and a plurality of retry-mode control units 13 that switches global retry mode to local retry mode, or vice versa, in accordance with a prescribed condition, so that a retry instruction is issued when the global snoop fails to process the requested data.