Question 1

When using a multiple-level queue strategy,aging is used to ensure that jobs in lower-level queues will eventually complete their execution.

Accepted Answer

Aging is used in multiple-level queue strategy to ensure that jobs in lower-level queues get a chance to execute and do not get starved by jobs in higher-level queues. This is achieved by gradually increasing the priority of jobs in lower-level queues as they wait in the queue for a longer time.

Question 2

Context switching is required by all preemptive algorithms.

Accepted Answer

Preemptive algorithms rely on context switching to interrupt the current process and switch to another process. This allows for efficient use of CPU time and is necessary for proper multitasking.

Question 3

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.

Accepted Answer

This is the basic concept of Round Robin scheduling where jobs are given a time slice to execute and if the processing is not completed within that time slice, the job is sent back to the end of the READY queue and its relevant information is saved in its Process Control Block.

Question 4

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

Accepted Answer

Most computer programs require both processing by the CPU and input/output operations, such as reading and writing data to memory or storage devices. Therefore, programs usually alternate between CPU cycles and I/O cycles in order to complete tasks effectively.

Question 5

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

Accepted Answer

First-come, first-served (FCFS) is a non-preemptive scheduling algorithm, meaning it processes jobs in the order they arrive without interrupting them once they have started.

Question 6

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

Accepted Answer

Web browsers use multithreading to perform multiple tasks simultaneously, such as retrieving images and sending/receiving emails, among other things.

Question 7

A job's state moves from HOLD to WAITING when it's ready to run but is waiting for the CPU.

Accepted Answer

A job moves from HOLD to READY state when it's ready to run, not WAITING. WAITING typically refers to a job that is ready to run but waiting for some other resources (not the CPU) or for an event to occur.

Question 8

As a process moves through the system,its status changes.Possible process statuses include HOLD,READY,RUNNING,WAITING,and
FINISHED.

Accepted Answer

This statement is true. Process statuses can change as they move through the system, and some of the possible statuses include HOLD, READY, RUNNING, WAITING, and FINISHED.

Question 9

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

Accepted Answer

Running only interactive jobs and letting batch jobs wait until the interactive load ceases can help minimize response time for interactive users. This ensures that the system resources are dedicated to executing user commands in real-time without any delays caused by background batch job processing.

Question 10

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.

Accepted Answer

This statement is correct. A scheduling policy and algorithm are necessary for an operating system to efficiently share a processor among multiple jobs or processes.

Question 11

A processor is also known as a CPU.

Accepted Answer

CPU stands for Central Processing Unit, which is the main processor in a computer system.

Question 12

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

Accepted Answer

The control program that handles the interruption sequence of events is called the interrupt handler or interrupt service routine (ISR), not the event scheduler. The event scheduler is typically involved in managing the execution of software tasks based on timing or event priorities.

Question 13

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.

Accepted Answer

SJN schedules jobs based on their CPU cycle time and is nonpreemptive, meaning the jobs cannot be interrupted once started.

Question 14

When using priority scheduling,priorities are assigned to jobs by the owner of the job (the user).

Accepted Answer

In priority scheduling, priorities can be assigned either by the system or by the users, depending on the specific implementation of the scheduling system.

Question 15

Dual core or quad core multi-core chips are larger than a single-processor chip but produce less current leakage and heat.

Accepted Answer

Dual core or quad core multi-core chips are indeed larger than a single-processor chip, but they do not inherently produce less current leakage and heat. In fact, increasing the number of cores can potentially lead to higher power consumption and heat generation, although advancements in technology and design techniques aim to mitigate these effects.

Question 16

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.

Accepted Answer

The Processor Manager is typically composed of two submanagers: one in charge of process scheduling and the other in charge of job scheduling. There isn't a submanager specifically for "program scheduling" as described; the correct term is process scheduling.

Question 17

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

Accepted Answer

A program is a passive entity consisting of instructions; it becomes a process (an active entity) when loaded into memory and executed by a processor.

Question 18

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

Accepted Answer

CPU-bound jobs are characterized by tasks that primarily require significant CPU time for processing rather than waiting on I/O operations. Printing a series of documents would involve more I/O cycles (waiting for the printer) than CPU cycles.

Question 19

If one job monopolizes the system,the extent of its overall effect on system performance depends on the scheduling policy and whether the job is CPU-bound or I/O-bound.

Accepted Answer

The statement is true. The scheduling policy and the type of job (CPU-bound or I/O-bound) can have a significant impact on system performance when one job monopolizes the system.

Question 20

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

Accepted Answer

The answer of The shortest remaining time (SRT)algorithm is often...

Quiz 4: Processor Management