Flush apparatus for a dual multi-processing system. Each dual multi-processing system has a number of processors, with each processor having a store in first-level write through cache to a second-level cache. A third-level memory is shared by the dual system with the first-level and second-level caches...http://www.google.ca/patents/US6122711?utm_source=gb-gplus-sharePatent US6122711 - Method of and apparatus for store-in second level cache flush
