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Compare and contrast short term, long term and medium term scheduling.

written 6.9 years ago by

priyad84 • 350

modified 2.6 years ago by

DevarenjiniP • 3.2k

operating systems

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written 2.6 years ago by

DevarenjiniP • 3.2k

Schedulers

Long Term Scheduler

The process are stored in mass storage device (typically disk). The long term scheduler selects a process from this pool and loads it into main memory for execution.
Controls degree of multiprogramming.
Executes less frequently.
It should select a mix of 1/O bound and CPU bound processes.

Short Term Scheduler

Selects among the processes that are ready to execute and allocates CPU to one of them.
Executes frequently.

Medium Term Scheduler

It removes process from memory hence reducing degree of multiprogramming. The process is swapped out and later ,swapped in by medium term scheduler.

Long-Term Scheduler	Short-Term Scheduler	Medium-Term Scheduler
It is a job scheduler	It is a CPU scheduler	It is a process swapping scheduler.
Speed is lesser than short term scheduler	Speed is fastest among other two	Speed is in between both short and long term scheduler.
It controls the degree of multiprogramming	It provides lesser control over degree of multiprogramming	It reduces the degree of multiprogramming.
It is almost absent orminimal in time sharing system	It is also minimal in time sharing system	It is a part of Time sharing systems.
It selects processes from pool and loads them into memory for execution	It selects those processes which are ready to execute	It can re-introduce the process into memory and execution can be continued.

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