Degree of multiprograming;SCHEDULERS

Question

degree of multiprogramming is controlled by which scheduler and how?

Answer 1

Degree of multiprog is control by long term scheduler.

Degree of multiprog is reduced by mid term scheduler.

• Degree of multiprog means number of process is in main memory .

• Ready ,run,wait state reside in main memory.

• Look at the diagram L.T.S is placed between new to ready state.

• If L.T.S is placed more number of process in ready state then drgree of multiprog is high.

• So if you want to control degree of multi then we says L.T.S you  dont put more number of  process in ready state.

• If ready state have already more number of process . And we want to reduce degree of multiprog.

• Then says M.T.S we suspend some process in  in suspend ready ( secondary mem).

 

Comments

how is degree of multiprogramming reduced by mid term scheduler?

I think mid term scheduler is used for swapping processes. So if a process is swapped out of main memory, then another (higher priority or desired process from the secondary memory) is put inside the main memory.

So, ultimately the number of processes inside the main memory should remain same.

Isn't it? Please correct me if i am wrong.

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@ssanjeev24 in some cases the process from MM is suspended to SM by MTS,