CPU Utilization

Question

 

Comments

I understood but i was confused why it cant be A ? please elaborate on it. Rest is correct

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There is no scope to increase the degree of multiprogramming.

Why and what is multiprogramming?

To increase the CPU utilisation, multiple processes are out in the ready queue

As just to increase the degree of multiprogramming only, we were submitting more processes to ready queue of main memory. But we observed that instead of increasing CPU utilisation, it decreases. So, it's obvious that degree of multiprogramming can't be increased further, instead suspend processes from the ready queue, which is termed as decreasing the multiprogramming.

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Thnx

Answer 1

Correct option is D

The situation which is presented has occured, due to phenomena knows as Thrashing,means after certain point if we try to increase degree of multiprogramming than CPU utilization decreases drastically.So here system is in thrashing.

As we can see hard disk utilization is 85% this means system is spending more time in Page replacement this is due to increase in degree of multiprogramming. 

So as a result,we cannot increase degree of multiprogamming, if we try to increase than CPU utilization will fall more which will result in more time for completion of process.

There is no deadlock as process are executing.

D one is correct if we suspend some prcoess than system can be recovered from thrashing and CPU utlization can also be increase which in overall will improve system performance.

Answer 2

system must be thrashing because hard disk utilization is more than cpu according to me there is A or D is the correct option if you find out correct then mail me

Comments

Why D???

We need to decrease degree of multiprog.