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Exam 4: Processor Management

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Question 21

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Most computer programs alternate between CPU cycles and I/O cycles.

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Question 22

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The control program that handles the interruption sequence of events is called the event scheduler.

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First-come,first-served (FCFS)is a preemptive scheduling algorithm that handles jobs according to their arrival time.

The Job Scheduler seeks to ____ when scheduling jobs.

The ____ is also called a high-level scheduler.

Shortest job next (SJN)is a nonpreemptive scheduling algorithm (also known as shortest job first,or SJF)that handles jobs based on the length of their CPU cycle time.

A processor is also known as a CPU.

The Process Scheduler assigns the CPU to execute the processes for those jobs placed on the ____ queue by the Job Scheduler.

CPU-bound jobs (such as printing a series of documents)have many brief CPU cycles and long I/O cycles.

The shortest remaining time (SRT)algorithm is often used in interactive systems.

A single processor can be shared by several jobs,or several processes,but only if the operating system has a scheduling policy,as well as a scheduling algorithm,to determine when to stop working on one job and proceed to another.

When the operating system detects a nonrecoverable error,the following step is performed first by the interrupt handler: ____.

In Round Robin scheduling,if processing isn't finished when time expires,the job is preempted and put at the end of the READY queue and its information is saved in its Process Control Block.

It is possible to minimize response time by running only interactive jobs and letting batch jobs wait until the interactive load ceases.

A program is an active entity that requires a set of resources,including a processor and special registers,to perform its function.

The Processor Manager is a composite of at least two submanagers: one in charge of job scheduling and the other in charge of program scheduling.

Assume that four jobs,A-D,require the CPU cycles listed below.Using the SJN algorithm,the average turnaround time is ____. Job: A B C D CPU cycle: 5 2 6 4

Context switching is required by all preemptive algorithms.

____ allows for faster turnaround of CPU-bound jobs.

Web browsers use multithreading routinely.For example,one thread can retrieve images while another sends and retrieves e-mail.