Additional Cache Notes. Dan Nguyen Spring 2005 - Lee. Cache Review. Cache is used to improve computer performance by giving faster access times. IE. Internet web browsers, or even simple examples such as shops Cache RAM is fast, operates at CPU level
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Spring 2005 - Lee
A type of memory cache.
Computer systems use multi-level cache hierarchies.
These “level” caches increase functionality in chips.
Multi-level caches make the cost of accessing memory
approximately the same as the cost of accessing a register.
Example: going to a movie rental store
A)Customer asks clerk for a popular movie. Clerk checks main storage room of all movies (one level cache)
B)Customer checks the movie shelves, not found->asks clerk. Clerk checks in storage room (two level cache)
Processor L1 L2 L3
Itanium 32KB 256KB 3MB, 4MB, 6MB
Itanium 32KB 96KB 2 MB, 4MB
Xeon MP 8KB 256KB, 512KB 512KB,1MB,2Mb
P4 8KB 512KB --