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)
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 CPU-bound 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.
C