MULTI-PROCESSOR SYSTEM, PREFETCH REQUEST CONTROL METHOD TO BE USED FOR THE SAME AND ITS PROGRAM

摘要

PPROBLEM TO BE SOLVED: To provide a multi-processor system for reducing main storage access frequency, and for reducing the DA access frequency of a request agent, and for reducing the data transfer frequency of a system interface. PSOLUTION: In a multi-processor system constituted of cards (#0)1 and (#1)2, a cache status PE(Pseudo-Exclusive) showing such a status that a cache line size write is ready while the data are invalid is newly added to a cache status MESI, and a protocol on the system interface for shifting to this status is decided. In the case of a pre-fetch operation for cache line size write in the multi-processor system, it can be instantaneously implemented on its own cache memory without reading from the main storage 4 or the fetching the data from a cache memory on another card. PCOPYRIGHT: (C)2007,JPO&INPIT