11. On a single-processor system, explain the benefit the better performance of multi-threaded kernel threads over single threaded kernel threads 12. But not parallelism, it is achievable to have concurrency in operating system threading? 13. The following processes are being scheduled using a priority (a smaller priority number implies a higher priority) and shortest job first all preemptive scheduling algorithms. Process Priority Burst Arrival P1 50 30 0 P2 40 35 25 P3 40 35 30 P4 45 25 60 P5 15 20 100 P6 20 20 105 i. Draw the Gantt charts that illustrate the execution of these processes using the above scheduling algorithms. ii. What is the turnaround time of each process for each of the scheduling algorithms in part a? iii. What is the waiting time of each process for each of these scheduling algorithms? iv. Which of the algorithms results in the minimum average waiting time (over all processes)