Multiple Choice Questions 9
Question1
The type of scheduling that involves the decision to add a process to those that are at least partially in main memory and therefore available for execution is referred to as:
选择一个答案
a. Medium-term scheduling √ |
b. None of the above |
c. Long-term scheduling |
d. I/O scheduling |
Question2
One difficulty with the Shortest Process Next (SPN) scheduling technique is:
选择一个答案
a. All of the above √ |
b. The lack of preemption |
c. The need to know or estimate required processing times for each process |
d. The starvation of longer processes |
Question3
One difficulty with the Shortest Remaining Time (SRT) scheduling technique is:
选择一个答案
a. The lack of preemption |
b. The starvation of shorter processes |
c. The need to know or estimate required processing times for each process √ |
d. All of the above |
Question4
Which of the following scheduling policies require prior knowledge or estimation of process length:
选择一个答案
a. Highest Response Ratio Next (HRRN) |
b. Shortest Remaining Time (SRT) |
c. Shortest Process Next (SPN) |
d. All of the above √ |
Question5
It is impossible to make definitive comparisons of various scheduling policies due to dependence on factors such as:
选择一个答案
a. The probability distribution of service times of the various processes |
b. The efficiency of the scheduling and context switching mechanisms |
c. All of the above √ |
d. The nature of the I/O demand and performance of the I/O subsystem |
Question6
The strategy that schedules processes based on their group affiliation is generally referred to as:
选择一个答案
a. Fair share scheduling √ |
b. All of the above |
c. Simulation modeling |
d. Queuing analysis |
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Question7
The traditional UNIX scheduler divides processes into fixed bands of priority levels, with the highest priority band being the:
选择一个答案
a. User process band |
b. None of the above |
c. File manipulation band |
d. Swapper band √ |
Question8
The decision as to which job to admit to the system next can be based on which of the following criteria:
选择一个答案
a. Priority |
b. Simple FIFO |
c. I/O requirements |
d. All of the above √ |
Question9
Typically, the swapping-in function for processes is based on the need to manage:
选择一个答案
a. Virtual memory |
b. The degree of multiprogramming √ |
c. None of the above |
d. Process priorities |
Question10
In terms of frequency of execution, the short-term scheduler is usually the one that executes:
选择一个答案
a. Least frequently |
b. None of the above |
c. About the same as the other schedulers |
d. Most frequently √ |
Question11
Response time in an interactive system is an example of:
选择一个答案
a. System-oriented criteria for short-term scheduling policies |
b. None of the above |
c. User-oriented criteria for short-term scheduling policies √ |
d. System-oriented criteria for long-term scheduling policies |
Question12
A typical way to overcome starvation of lower-priority processes in a priority-based scheduling system is to:
选择一个答案
a. Round-robin cycling of processes in a priority queue |
b. All of the above |
c. Change a process priority randomly |
d. Change a process priority with its age √ |
Question13
Which of the following scheduling policies allow the O/S to interrupt the currently running process and move it to the Ready state?
选择一个答案
a. First-come-first-served |
b. Non-Preemptive |
c. None of the above |
d. Preemptive √ |
Question14
In terms of the queuing model, the total time that a process spends in a system (waiting time plus service time) is called:
选择一个答案
a. None of the above |
b. Normalized turnaround time (TAT) |
c. Turnaround or residence time (TAT) √ |
d. Finish time (FT) |
Question15
In the Round Robin scheduling technique, the principle design issue is:
选择一个答案
a. Determining the fair distribution of time quanta to individual processes |
b. Determining the length of the time quantum √ |
c. None of the above |
d. Determining the method of cycling through a given set of processes |