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Which scheduling class distributes CPU resources among its processes based on assigned importance?
A. Fair Share Scheduler (FSS)
B. Real-Time (RT)
C. Fixed-priority (FX)
D. Timesharing (TS)
Correct Answer: C
Explanation/Reference:
Explanation:
The FX scheduler provides a scheduling policy for processes that require user or application control of scheduling priorities. The priorities of processes that run under FX are fixed.
The FX class provides a fixed-priority preemptive scheduling policy. This policy is used by processes that require user or application control of scheduling priorities but are not dynamically adjusted by the system. By default, the FX class has the same priority range as the TS, IA, and FSS classes. The FX class allows user or application control of scheduling priorities through user priority values assigned to processes within the class. These user priority values determine the scheduling priority of a fixed- priority process relative to other processes within its class.
Incorrect:
Not A: The fair share scheduling class enables you to allocate CPU time based on shares instead of the priority scheme of the timesharing (TS) scheduling class. Not D: The goal of the time-sharing policy is to provide good response time to interactive processes and good throughput to CPUbound processes. The scheduler switches CPU allocation often enough to provide good response time, but not so often that the system spends too much time on switching. Time slices are typically a few hundred milliseconds.
The time-sharing policy changes priorities dynamically and assigns time slices of different lengths.
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Answer A:
FSS: control the allocation of available CPU resources among workloads based on their importance.
This class is share based rather than priority based. Threads managed by FSS are scheduled based on their associated shares and the processor’s utilization.
NOT C:
FX: Priorities for these threads associated with this class are fixed. In other words, they do not vary dynamically over the lifetime of the thread.