31 Questions
What is the purpose of the target latency in the CFS scheduler?
To determine the time interval during which a task should run at least once
What is the effect of increasing the number of active tasks on the target latency in the CFS scheduler?
Target latency increases
What is the role of the decay factor in the CFS scheduler?
To associate a lower priority with a higher decay rate
What is the scheduling algorithm used in Windows?
Priority-based preemptive scheduling
In a symmetric multiprocessing system, how do processors access the system data structures?
Each processor accesses the system data structures
What is the purpose of the priority classes in Windows?
To combine with relative priority to give a numeric priority
What is the effect of waiting on a resource in Windows?
Priority is boosted
In an asymmetric multiprocessing system, which processor accesses the system data structures?
Only one processor accesses the system data structures
What is processor affinity in multiprocessing?
The process has a soft affinity for the processor on which it is currently running
What is the purpose of the dispatch table in Solaris?
To convert class-specific priorities into a global priority
What is the function of the dispatcher module in an operating system?
To give control of the CPU to the process selected by the short-term scheduler
What is the effect of having multiple threads at the same priority in Solaris?
The threads are selected via Round Robin scheduling
What is the purpose of load balancing in multiple-processor scheduling?
To distribute workload evenly among all CPUs
What is the purpose of the global priority in Solaris?
To select the next task to run
What is dispatch latency?
The time it takes for the dispatcher to stop one process and start another
What is push migration in load balancing?
Periodic task checks load on each processor, and if found pushes task from overloaded CPU to other CPUs
What is the advantage of multicore processors?
They are faster and consume less power
What is the criteria for selecting a CPU-scheduling algorithm for an OS?
The algorithm's suitability for the OS's requirements
What is the goal of maximizing CPU utilization?
To keep the CPU as busy as possible
What is the convoy effect in FCFS scheduling?
A short process is delayed by a long process
What is the purpose of thread scheduling in multicore processors?
To utilize multiple threads per core
What is the advantage of using Shortest-Job-First (SJF) scheduling?
It is optimal and gives minimum average waiting time
What is the difference between hard and soft real-time systems?
Hard real-time systems have a guarantee as to when critical real-time process will be scheduled, while soft real-time systems have no guarantee
What is load balancing in multiple-processor scheduling?
To keep all CPUs loaded for efficiency
How does the SJF scheduling algorithm determine the length of the next CPU burst?
By estimating the length based on previous CPU bursts
What is the purpose of pull migration in load balancing?
Idle processors pull waiting tasks from busy processors
What is the main difference between FCFS and SJF scheduling?
FCFS schedules based on arrival time, while SJF schedules based on burst time
In a multiprocessor system, what is the advantage of symmetric multiprocessing?
Each processor accesses the system data structures, alleviating the need for data sharing
What is the purpose of the scheduling criteria?
To optimize system performance
What is the goal of minimizing waiting time in scheduling?
To reduce the time a process has been waiting in the ready queue
What is the role of the short-term scheduler in an operating system?
To select the next process to execute
Test your knowledge on multilevel queue scheduling, a CPU scheduling algorithm that allows processes to move between queues. Learn about time slicing, foreground and background processes, and how aging is implemented. Based on Operating System Concepts, 9th Edition by Silberschatz, Galvin, and Gagne.
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