madeeasy os

Question

why c) option wrong?

Comments

Yes, degree of multiprogramming increases CPU utilization but after a certain limit thrashing occurs so CPU utilization goes down hence option a is wrong.

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Yes A is a possibility.

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@Somoshree Datta 5

CPU utilization does not always increase, upto a certain point it will increase , but once the number of pages per process is less than required, process will spend more time in bringing the required page into memory rather than actually executing. This is called Thrashing .

Answer 1

Option C is wrong because The kernel level threads are independent to each other and they have more number of contexts than User level thread. And the context switching time depends on the number of contexts. Also To give switch the thread in Kernel ,they required System Calls made to Operating System. And hence Kernel Level Threads require more Time than User level thread.

Option C is false statement

Option A is also False because CPU utilization does not increase ALWAYS. At some point ,on increasing DOM(Degree of Multiprogramming) The CPU utilization decreases and This phenomenon is called THRASHING.

So none of them is true 

CORRECT ME IF WRONG