WGU - C191

WGU - C191

4.7 (16 reviews) Terms in this set (61) Western Governors UniversityC 952 Save Practice questions for this set Learn1 / 7Study using Learn System libraries can be shared.Choose an answer 1What is the role of the OS?2 What is a benefit of using virtual memory?3 Which advantage does short-term scheduling have compared with long-term scheduling?4 Which system calls can be grouped under the category of process controls?Don't know?

What is the role of the OS? To manage a computer's hardware Which OS service provides functions that are helpful to the user?Program execution Which OS service provides functions that are helpful to the user?Program execution Which system call is used for device manipulation?ReadConsole() Which system calls can be grouped under the category of process controls?Allocate, free memory Which service function is responsible for identifying and correcting exceptions such as the lack of paper in a printer?Error detection Which type of OS service uses the CLI?User interface What represents layer zero (0) in the layered approach?Hardware What is a disadvantage of booting an OS stored in ROM?Changing a bootstrap requires new hardware chips.What is a valid process state? Waiting

What are two valid components of a process control block (PCB)?The process counter & The process state What is the difference between kernel and user threads?Kernel threads are directly managed by the operating system, whereas user threads are managed without kernel support.Which advantage does short-term scheduling have compared with long-term scheduling?It takes less time to select a process to execute next.What is considered stable when the average rate of process creation is equal to the average departure rate of processes leaving the system?The degree of multiprogramming Which action allows an application that is in the background to be passed to the foreground and vice versa?Memory reload What is the process of context switching?Performing a state save and a state restore Which features are included in the DTrace tool?Compiler, providers of probes, and consumers What is the difference between cooperative and preemptive scheduling?Cooperative scheduling occurs when a process terminates, whereas preemptive scheduling occurs when a process initiates.

Which scheduling criteria measures the number of processes completed per time unit?Throughput Which criterion attempts to keep the processor as busy as possible?CPU utilization When does starvation occur in the priority scheduling algorithm?When a process is waiting indefinitely Which scheduling algorithm was designed especially for time sharing systems?Round-robin What is a difference between soft and hard processor affinity?Hard affinity specifies a subset of processors on which a process may run, whereas soft affinity leaves the processor selection to the OS.What is an address that is generated by the CPU?A logical address Which general-purpose storage is accessed directly by the CPU?The main memory What is a limitation of swapping on mobile systems?Applications that fail to free up sufficient memory are terminated.What is the name of the memory allocation scheme where the operating system keeps a table of available holes?Variable partition