doubt

Question

shouldn't be answer "4" short term scheduler?

Comments

No, I think CPU scheduler(or Short term scheduler) is responsible for moving the state of process from READY to RUNNING.

Long term scheduler is responsible for entering the process into START state to EXIT state until process is not going to terminated.

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LTS(long term scheduler)is responsible for creating and bringing new process into memory or ready states and control degree of multiprogramming  after its job is done then STS(short term scheduler )comes in picture which selects one process in the  ready states to schedule into running states and if that process doesn't need I/O then will terminate........here it's saying which program are admitted to system from execution and which one should be exited so my point is exited mean process terminated then STS must have done this part na?

Answer 1

Answer is Long term scheduler (option 3).

Long term scheduler decides which process enter the system, its task is to select a good combination of IO bound and CPU bound process for efficient CPU utilization. It controls degree of multiprogramming.

Short term scheduler decides which process will be selected from the process waiting in ready queue depending on scheduling algorithm used.

Medium term scheduler reduces the degree of multi-programming if required.

Comments

MTS does not control degree of multiprogramming. please check ur concepts @rahul Jain25

LTS does this work.

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Thanks. I have updated answer.

Answer 2

it is very clear that LTS controls the degree of multiprogramming and so it is responsible for selecting the process that will enter the system for execution i.e it creates job pool and perform job scheduling

whereas STS is responsible for CPU scheduling, out  of various jobs in job pool it selects one of the job for execution so it is  not handling the process which will enter the system it is already done by LTS.

and MTS is responsible for swapping the processs out of the system in order to limit the degree of multiprogramming

Coming to this question ,for me it is very confusing question creator is not clear with what answer he/she wanted from us.

still in confusion how LTS is responsible for the process exit  .

request to others please schedule this question to your CPU (brain )