State two advantages and two disadvantages of a layered operating system.

The first 200 words of this essay...

Coursework 1

Question 1

State two advantages and two disadvantages of a layered operating system.

1).

- Advantages of layered operating systems are:

1. It is decomposable and therefore effects separation of concerns and different abstraction levels

2. It allows good maintenance, where you can make changes without affecting layer interfaces

- Disadvantages of layered operating systems are:

1. It is difficult to exactly assign of functionalities to the correct and appropriate layer

2. Because of having too many layers, performance of the system is

degraded

Question 2

a. Give definitions for: turnaround time, throughput, processor utilisation

b. When might a context switch occur? What exactly is saved? Why?

c. In the presence of asynchronous interrupts, even the most innocent

looking program can produce mysterious results. If concurrency can

produce subtle bugs, why use it?

2).

a. Turnaround time: - is the time taken between the submission and complete

execution of a process, which includes the actual running

time and waiting