Question

please answer each question in details with each answer being highlighted thank you

1. Describe differences between kernel and user mode (10 points )
2. Consider the following set of processes, with the length of the CPU burst given in milliseconds

Process	Burst time	Priority
P1	10	3
P2	1	1
P3	2	3
P4	1	4
P5	5	2

The processes are assumed to have arrived in the order, all in time 0.

1. Fill-up 4 Gantt charts that illustrate the execution of these processes using the following scheduling algorithms: (15 points)

1. SJF

Time	0
CPU
Ready queue

2. Preemptive priority (smallest priority number – higher priority)

Time	0
CPU
Ready queue

3. RR (quantum=1)

Time	0
CPU
Ready queue

4. HRRF

Time	0
CPU
Ready queue

2. Include analysis table: TAT, Normalized TAT, waiting time (5 points)
3. Which of the algorithms from part a) results in the minimum average waiting time (overall processes)? (5 points)

3. Explain how time quantum value and context switching time affect each other, in a Round Robin scheduling algorithm. (10 points)
4. Consider the following piece of C code:

void main(){

              if(fork()){

              fork();

}

              fork();

              exit();

}

How many child processes are created upon the execution of this program?

Answer 1

solved the complete question but i dont able to upload multiple images,

No. Of child process created is 5

User level thread implemented by user or programmer while kernel thread created by Os.

Os cant recognize user thread but can kelnel thread

User level thread are dependent thread but kernel thread are independent

User level thread implementation is easy but kernel thread not.

User level thread having less context but level thread having high context.