Storage-Device Hierarchy
Caching
Important principle, performed at
many levels in a computer (in hardware, operating system, software)
Information in use copied from
slower to faster storage temporarily
Faster storage (cache) checked
first to determine if information is there
If it is, information used
directly from the cache (fast)
If not, data copied to cache and
used there
Cache smaller than storage being
cached
Cache management important design
problem
Cache size and replacement policy
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