Boots – shoes – and leggings
Patent
1991-04-03
1993-11-23
Robertson, David L.
Boots, shoes, and leggings
364DIG1, 36424341, 36424344, 36424345, G06F 1300
Patent
active
052652327
ABSTRACT:
A coherence directory and its methods of operation are disclosed for private processor caches in a multiple processor system to control data coherence in the system. It provides cross-invalidate (XI) controls for the assignment of exclusive and public ownership to data units in the processor caches, including required cross-invalidation of data units among the processor caches to obtain data coherence in the system in an efficient manner. The coherence directory can be used in a multiple processor system with or without any shared second level (L2) cache, shared or private. When a shared L2 cache is used to improve system access time, the coherence directory can also be used as the second level directory for the shared L2 cache and eliminate the need for any additional L2 directory(s).
REFERENCES:
Censier et al., "A New Solution to Coherence Problems in Multicache Systems", IEEE Transactions on Computers, C-27 No. 12, Dec. 1978, pp. 1112-1118.
Chaiken et al., "Directory-Based Cache Coherence in Large-Scale Multiprocessors", Computer, vol. 23, No. 6, Jun., 1990, pp. 49-58.
Gannon Patrick M.
Ignatowski Michael
Krygowski Matthew A.
Liu Lishing
Price Donald W.
Goldman Bernard M.
International Business Machines - Corporation
Robertson David L.
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