超星 - Chapter 4 CPU Scheduling

单选题

The real difficulty with SJF in short term scheduling is ____________

A. it is too good an algorithm
B. knowing the length of the next CPU request
C. it is too complex to understand
D. none of the mentioned

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单选题

The FCFS algorithm is particularly troublesome for ____________

A. time sharing systems
B. multiprogramming systems
C. multiprocessor systems
D. operating systems

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单选题

Consider the following set of processes, the length of the CPU burst time given in milliseconds.Assuming the above process being scheduled with the SJF scheduling algorithm.

A. The waiting time for process P1 is 3ms
B. The waiting time for process P1 is 0ms
C. The waiting time for process P1 is 16ms
D. The waiting time for process P1 is 9ms

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单选题

Preemptive Shortest Job First scheduling is sometimes called ____________

A. Fast SJF scheduling
B. EDF scheduling – Earliest Deadline First
C. HRRN scheduling – Highest Response Ratio Next
D. SRTN scheduling – Shortest Remaining Time Next

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单选题

An SJF algorithm is simply a priority algorithm where the priority is ____________

A. the predicted next CPU burst
B. the inverse of the predicted next CPU burst
C. the current CPU burst
D. anything the user wants

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单选题

Choose one of the disadvantages of the priority scheduling algorithm?

A. it schedules in a very complex manner
B. its scheduling takes up a lot of time
C. it can lead to some low priority process waiting indefinitely for the CPU
D. none of the mentioned

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单选题

What is ‘Aging’?

A. keeping track of cache contents
B. keeping track of what pages are currently residing in memory
C. keeping track of how many times a given page is referenced
D. increasing the priority of jobs to ensure termination in a finite time

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单选题