Assume that programs and data may be shuttled from any level to any other level under the operating system’s control.The time it takes to transfer items between two particular levels is dependent upon the speed of the lowest (and slowest) level involved in the transfer.Why might the operating system choose to shuttle a program from cache directly to secondary memory, thus bypassing primary memory?
What will be an ideal response?
The copying that goes on in transfers between the various levels of the hierarchy
needs to be sensitive to the contents of each level to which something is
being moved. If the contents of a level need to be preserved, then those contents
will need to be moved out of the way before they can be overwritten. If
the contents do not need to be preserved, they may be overwritten. Thus, there
are times when these considerations might favor a direct cache-to-secondarymemory
transfer. But it is unlikely that a system would be designed this way.
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