LOW OCCUPANCY PROTOCOL FOR MANAGING SIMULTANEOUS TRANSACTIONS WITH DEPENDENCY

摘要

PROBLEM TO BE SOLVED: To provide an SMP (symmetrical multiprocessor system) where many multiprocessor nodes including shared memories are connected to each other via a switch. ;SOLUTION: Each of architecture and coherence protocol which are used to a large SMP has a hierarchy switch structure to connect many multiprocessor nodes 10 to a switch 15 and to make them operate with each optimum performance. Every node 10 has a simultaneous buffer system to enable all processors of the node to operate with its optimum performance and also includes many elements, i.e., a victim cache, a directory and a transaction tracking table to maintain the memory coherence. The victim cache selectively selects the victim data having a preceding remote node memory to improve all performance of the memory. A delay writing buffer which is used with the directory and identifies the victim written in the memory improves better the memory performance.;COPYRIGHT: (C)1999,JPO