Match the following : Codes :List - I List - II a. Multilevel feedback queue i. Time-slicing b. FCFS ii. Criteria to move processes between queues c. Shortest process next iii. Batch processing d. Round robin scheduling iv. Exponential smoothening
| a | b | c | d |
| ii | iii | iv | i |
A multilevel feedback queue needs rules for moving processes between its queues (a-ii), and FCFS is the simple policy typical of batch processing (b-iii).
Shortest process next predicts the next CPU burst using exponential averaging of past bursts (c-iv).
Round robin gives each process a fixed time slice in turn (d-i).
Hence, a-ii, b-iii, c-iv, d-i.
Similar Questions
Which of the following statements is not true for Multi Level Feedback Queue processor scheduling algorithm ?
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Match List - I with List - II.
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When we apply Shortest Job First (SJF) scheduling Policy/algorithm, Process (P2) faces partial starvation and waits for the longer time to execute. Which one of the following non-preemptive algorithms addresses this problem?
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Important Questions from CPU Scheduling
- A computer has two processors, $M_1$ and $M_2$. Four processes $P_1, P_2, P_3, P_4$ with CPU bursts of 20, 16, 25, and 10 milliseconds, respectively, arrive at the same time and these are the only processes in the system. The scheduler uses non-preemptive priority scheduling, with priorities decided as follows:
- $M_1$ uses priority of execution for the processes as, $P_1 > P_3 > P_2 > P_4$, i.e., $P_1$ and $P_4$ have highest and lowest priorities, respectively.
- $M_2$ uses priority of execution for the processes as, $P_2 > P_3 > P_4 > P_1$, i.e., $P_2$ and $P_1$ have highest and lowest priorities, respectively.
Consider the following table about processes, their burst time and arrival time
Process Burst Time Arrival Time P1 09 0 P2 30 0 P3 04 0 P4 08 2 P5 11 6
Now which of the process shall finish second last as per the respective GANTT charts for the non- preemptive SJF and Round Robin (time quantum = 10) scheduling methods.- Consider the following processes with CPU Burst time P1, P2, P3 arrived at time 0.
Process CPU Burst Time (MS) P1 24 P2 3 P3 3
What is the average waiting time of these processes executed using FCFS algorithm. - Consider the following set of processes assumed to have arrived at time 0 in order $P_1, P_2, P_3, P_4$ and $P_5$ with the length of CPU burst given in Milliseconds.What is the average waiting time (in milliseconds) using priority scheduling.
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