A variation of the round-robin

A variation of the round-robin scheduler is the regressive round-robin scheduler. This scheduler assigns each process a time quantum and a priority. The initial value of a time quantum is 50 milliseconds. However, every time a process has been allocated the CPU and uses its entire time quantum (does not block for I/O), 10 milliseconds is added to its time quantum, and its priority level is boosted. (The time quantum for a process can be increased to a maximum of 100 milliseconds.) When a process blocks before using its entire time quantum, its time quantum is reduced by 5 milliseconds, but its priority remains the same. What type of process (CPU-bound or I/O-bound) does the regressive round-robin scheduler favor? Explain.


The regressive round robin scheduler will favour theCPU-bound processes. Because CPU-bound processes when usesits entire time quantum, they get additionaly 10 milliseconds astime quantum as well as there priority gets boosted.

The regressive round robin scheduler will not favour theI/O-bound processes. Because these processes can beblocked for I/O before consuming the full quota of time quantum,and their priority will not get effected , its mean priority willbe same as before.

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