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It is a Computer Science term.

Two-level scheduling is needed when memory is too small to hold all the ready

processes. Some set of them is put into memory, and a choice is made from that set.

From time to time the set of in-core processes is adjusted. This algorithm is easy to

implement and reasonably efficient, certainly a lot better than, say, round robin without

regard to whether the process was in memory or not.

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Q: Why is two-level scheduling commonly used?
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