METHOD AND DEVICE FOR CONTROLLING VIRTUAL CACHE

摘要

PROBLEM TO BE SOLVED: To provide a method and a system for managing a cache in a data processing system. SOLUTION: The data processing system including a communication network connecting plural devices is provided. A 1st device out of plural ones includes plural requesters (or queues) and one corresponding inherent tag out of plural inherent tags is permanently allocated to each requester. In response to a communication request by a requester in the 1st device, the tag allocated to the requester is transferred to the communication network together with a requested communication transaction. The data processing system includes a cache having a cache directory 60. A status index indicating the status of at least one of plural data entries of the cache is stored in the directory 60. In response to the reception of a cache operation request, whether the status index is to be updated or not is checked.