CS 25000 Chapter Notes - Chapter 12: Dirty Bit, Comparator, Memory Address
30 Mar 2017
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Storage mechanisms are organized into a hierarchy that includes general-purpose registers, main memory, and secondary storage. Data items migrate up and down the hierarchy, usually under control of software. In general, items move up when they"re read and move down when they"re written. 12. 3 definition of caching: the term caching refers to an important optimization technique used to improve the performance of any hardware or software system that retrieves information. In memory systems, caching can reduce the von. Designed to return answers faster than the mechanism that normally fulfills the requests. Most are < 10% of main memory storage size: active, contains an active mechanism that examines each request and decides how to respond, transparent. Say it is transparent, which means that a cache can be inserted without making changes to the requester or data store. In most cases, a cache mechanism doesn"t receive instructions on how to act or which data items to store in the storage.
