In hierarchical memory systems, a certain amount of overhead is involved in moving programs and data between the various levels of the hierarchy. Discuss why the benefits derived from such systems justify the overhead involved.
What will be an ideal response?
Hierarchical memory systems are designed to keep information as accessible as possible
for its likely level of use. Information (programs and/or data) not likely to be needed by
an active process for some time should be kept on secondary storage. Information likely to
be needed by an active process, especially a running or ready process, should be kept in primary
memory. Information being intensely referenced by a running process should be maintained
in high-speed cache memory if it is available. The relative expense of each of these
kinds of memory prohibits us from keeping all programs and data at the fastest available
level, so we try to maintain the information at the optimal level.The trade-off is that the cost
of this management (hopefully) is significantly less than the cost of not having the information
at the optimal level when it is needed.
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What will be an ideal response?
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