When can page cache and register cache be used for same purpose?

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i can't figure this out! i read the question somewhere.
please answer in context with Operating Systems.
~~[its urgent]~~

Posted 1-May-12 7:59am

Ghost_x

Updated 15-Jun-13 12:12pm

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Sergey Alexandrovich Kryukov 1-May-12 14:06pm

Urgent? If it was for your work, the question would be different. Sounds like it's one of those test or interview questions...
--SA

Nelek 1-May-12 14:15pm

Saying "it is urgent" is not going to help you at all

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Ganesan Senthilvel · Answer 1 · 2012-05-08T07:01:00

Page cache is the cache of disk pages kept by the operating systems, stored in unused main memory. Memory cache is random access memory (RAM) that a computer microprocessor can access more quickly than it can access regular RAM.

If performance is top priority, then memory cache is the choice. If the storage size is important, then page cache is the option.