What are short, longand mediumterm scheduling?
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Long term scheduler determines which programs are admitted
to the system for processing. It controls the degree of
multiprogramming. Once admitted, a job becomes a process.
Medium term scheduling is part of the swapping function.
This relates to processes that are in a blocked or
suspended state. They are swapped out of real-memory until
they are ready to execute. The swapping-in decision is
based on memory-management criteria.
Short term scheduler, also know as a dispatcher executes
most frequently, and makes the finest-grained decision of
which process should execute next. This scheduler is
invoked whenever an event occurs. It may lead to
interruption of one process by preemption.
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