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Difference Between Long-Term and Short-Term Scheduler in OS
In this post, we will understand the difference between long-term and short-term schedulers in operating system −
Long-term scheduler
It is also known as the job scheduler.
This scheduler takes the process from the ‘job pool’.
In this scheduler, the programs are setup in the queue.
Based on the requirement in hand, the relevant job is selected.
It regulates more DOM (Degree of Multi-programming).
It regulates the programs that are selected by the system to be processed.
It has less speed in comparison to the short-term scheduler.
It changes the state of the process from ‘New’ to ‘Ready’.
This kind of scheduler is not used by time-sharing operating systems.
It selects a relevant process, the right mix of I/O bound and CPU bound.
Short-term scheduler
It is also known as CPU Scheduler.
This scheduler takes the process from ‘ready’ queue.
No queue exists in this scheduler.
It regulates less DOM (Degree of Multi-programming).
It ensures the right program that is important/required to be processed.
It has a high speed in comparison to the long-term scheduler.
It changes the state of the process from ‘Ready’ to ‘Running’.
It may be used minimally in a time-sharing system.
It selects a new process for the CPU frequently.
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