MadeEasy Test Series: Operating System - Prcocess

Question

Consider the following statements:

S1: Long term scheduler sends the process from ready state to running state.

S2: Medium term scheduler controls the degree of multiprogramming.

which of the following is correct?

• A. Only S1
• B. Only S2
• C. Both S1 & S2
• D. Neither S1 & S2

Comments

both false, LTS controls degree of multiprogramming whereas STS sends process from ready to running.

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Long Term Scheduler controls the number of processes in the ready state i.e the degree of multiprogrammig where as the short term scheduler decides fromthe list of ready processes which will get the cpu next so both are fale

Answer 1

Long Term Scheduler

It is also called a job scheduler. A long-term scheduler determines which programs are admitted to the system for processing. It selects processes from the queue and loads them into memory for execution. Process loads into the memory for CPU scheduling.

The primary objective of the job scheduler is to provide a balanced mix of jobs, such as I/O bound and processor bound. It also controls the degree of multiprogramming. If the degree of multiprogramming is stable, then the average rate of process creation must be equal to the average departure rate of processes leaving the system.

Short Term Scheduler

It is also called as CPU scheduler. Its main objective is to increase system performance in accordance with the chosen set of criteria. It is the change of ready state to running state of the process. CPU scheduler selects a process among the processes that are ready to execute and allocates CPU to one of them.

Short-term schedulers, also known as dispatchers, make the decision of which process to execute next. Short-term schedulers are faster than long-term schedulers.

$So, answer\ is\ D.$

Comments

Can't we say that medium scheduler term may control the degree of multiprogramming, because it suspends the processes, thereby reducing the degree of multiprogramming?

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Nowhere mentioned like that. Maybe because thats not the primary job of midterm scheduler.

Medium-term scheduling is a part of swapping. It removes the processes from the memory. It reduces the degree of multiprogramming. The medium-term scheduler is in-charge of handling the swapped out-processes.