Karteikarten
SCIA 360 Chapter 4
Karten in diesem Stapel (20)
- 1A(n) ____ is created by a process, and it can be scheduled and executed independently of its parent process. a. thread b. program c. miniprocess d. instruction seta. thread
- 2____ requires that the processor be allocated to each job or to each process for a period of time and deallocated at an appropriate moment. a. Cyclic programming b. Dedicated processing c. Multiprogramming d. Multi-core processingc. Multiprogramming
- 3The ____ is also called a high-level scheduler. a. Process Scheduler b. Job Scheduler c. Program Scheduler d. Thread Schedulerb. Job Scheduler
- 4The Job Scheduler seeks to ____ when scheduling jobs. a. run all CPU intensive jobs first b. run all I/O intensive jobs first c. balance CPU and I/O intensive jobs d. run the quickest jobs firstc. balance CPU and I/O intensive jobs
- 5The Process Scheduler assigns the CPU to execute the processes for those jobs placed on the ____ queue by the Job Scheduler. a. WAITING b. NEXT c. PROCESS d. READYd. READY
- 6When a job is accepted by the system, it’s put on ____ and placed in a queue. a. HOLD b. RUNNING c. WAITING d. READYa. HOLD
- 7The transition from ____ is initiated by the Job Scheduler according to some predefined policy. At this point, the availability of enough main memory and any requested devices is checked. a. READY to RUNNING b. RUNNING to WAITING c. RUNNING back to READY d. HOLD to READYd. HOLD to READY
- 8The transition from ____ can be initiated by the Process Scheduler or the Job Scheduler. a. WAITING to READY b. RUNNING to WAITING c. RUNNING to FINISHED d. HOLD to READYc. RUNNING to FINISHED
- 9Each thread in a process is represented by a data structure called a ____ that contains basic information such as the thread’s unique identification, state, and priority. a. Thread Control Block b. Thread State Block c. Thread Pointer d. Thread Queuea. Thread Control Block
- 10An I/O request is called a(n) ____ wait in multiprogramming environments. a. forced b. natural c. scheduled d. indirectb. natural
- 11The first-come, first-served (FCFS) algorithm is fine for most ____ systems. a. multiuser b. user initiated c. interactive d. batchd. batch
- 12Assume that four jobs, A-D, are in the READY queue at Time 0 and require the CPU cycles listed below. Using the SJN algorithm, the ____ job is run first. Job: A B C D CPU cycle: 5 2 6 4 a. A b. B c. C d. Db. B
- 13Assume 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 a. 5.5 b. 6.8 c. 9.0 d. 11.1c. 9.0
- 14Some systems use a strategy known as ____ to increase the priority of jobs that have been in the system for an unusually long time in order to expedite their exit. a. lagging b. aging c. bumping d. accelerated priorityb. aging
- 15Assume that jobs A-D arrive in the READY queue in quick succession and have the CPU cycle requirements listed below. Using the SRT algorithm, the average turnaround time is ____. Arrival time: 0 1 2 3 Job: A B C D CPU cycle: 6 3 1 4 a. 2.5 b. 6.25 c. 7.75 d. 9.0b. 6.25
- 16A general rule of thumb for selecting a proper time quantum in Round Robin scheduling is that it should be long enough to allow ____ percent of the CPU cycles to run to completion. a. 20 b. 60 c. 80 d. 100c. 80
- 17No movement between queues is a very simple policy that rewards those who have ____ jobs. a. high-priority b. low-priority c. CPU-bound d. I/O-bounda. high-priority
- 18____ allows for faster turnaround of CPU-bound jobs. a. No movement between queues b. Movement between queues c. Variable time quantum per queue d. Agingc. Variable time quantum per queue
- 19____ is a dynamic-priority preemptive scheduling algorithm built to address the critical processing requirements of real-time systems and their pressing deadlines. a. Variable Time Quantum Per Queue b. Round Robin c. Shortest Job Next d. Earliest Deadline Firstd. Earliest Deadline First
- 20When the operating system detects a nonrecoverable error, the following step is performed first by the interrupt handler: ____. a. the state of the interrupted process is saved b. the type of interrupt is described and stored c. the interrupt is processed d. the processor resumes operationb. the type of interrupt is described and stored