(Operating Systems)

Consider a program that performs the following steps repeatedly:
1. Use the CPU for 2 milliseconds.
2. Issue in I/O to disk for 7 milliseconds.
3. Use the CPU for 5 milliseconds.
4. Issue an I/O to the network for 9 milliseconds.
Assume that each step depends on data obtained from the previous step. Also, assume that it takes 1
millisecond to execute the device driver code for both the disk and the network at the beginning of the I/O.

Answer the following questions:

(a) Draw a time-line diagram that illustrates the utilizations of the CPU, disk, and network over the execution of two iterations of the program above.

(b) What are the utilizations of the CPU, disk and network over these two iterations?

(c & d) Assume that there are two processes of the program above running concurrently, answer parts (a) and (b) for this case showing which part belong to which process.