The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 08, 2002
Filed:
Mar. 31, 1999
Douglas J. Joseph, Danbury, CT (US);
Maged M. Michael, Danbury, CT (US);
Ashwini Nanda, Mohegan Lake, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method and structure for a system for maintaining coherence of cache lines in a shared memory multiplexor system comprises a system area network and a plurality of compute nodes connected to the system area network. Each of the computer nodes includes a local main memory, a local shared cache and a local coherence controller and computer nodes external to a given compute node include external shared caches and the coherence controller includes shadow directories, each corresponding to one of the external shared caches. Each of the shadow directories includes state information of the local main memory cached in the external shared caches. The shadow directories include only state information of the local main memory cached in the external shared caches.