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Describe the differences among

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Describe the differences among short-term,medium-term,and longterm scheduling.
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•Short-term (CPU scheduler)—selects from jobs in memory those jobs that are ready to execute and allocates the CPU to them.
•Medium-term—used especially with time-sharing systems as an intermediate scheduling level.A swapping scheme is implemented to remove partially run programs from memory and reinstate them later to continue where they left off.
•Long-term (job scheduler)—determines which jobs are brought into memory for processing.
The primary difference is in the frequency of their execution.The short-term must select a new process quite often.Long-term is used much less often since it handles placing jobs in the system and may wait a while for a job to finish before it admits another one.
发表于 2018-05-05 21:28:30 回复(0)
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