Final answer:
The HRRN scheduling policy gives priority to processes with higher waiting times rather than longer jobs. The priority is calculated by a formula that includes waiting time and service time, and it does not inherently favor longer jobs.
Step-by-step explanation:
The subject in question refers to the Highest Response Ratio Next (HRRN) scheduling policy, which is a concept in operating systems used in the context of process scheduling. The provided information suggests a misunderstanding as the HRRN scheduling algorithm actually gives longer waiting processes a higher priority, not necessarily longer jobs. The priority in HRRN is determined by a formula incorporating both the wait time and the estimated run time, preventing longer jobs from dominating CPU time.
For instance, the HRRN ratio is calculated as (Response Time = Waiting Time + Service Time) / Service Time, where a job that has been waiting longer increases its response time ratio, thus moving up in the queue. However, having a larger service time (or a “larger job”) does not inherently benefit from this ratio, as both the numerator and the denominator increase.
Consider the example of two processes, where Process A has been waiting for 10 units of time and requires 5 more units to complete, and Process B has been waiting for 20 units of time and requires 20 more units to complete. Process A's response ratio would be (10+5)/5 = 3, while Process B's would be (20+20)/20 = 2. Despite having a longer job, Process B has a lower ratio and would therefore not be favored over Process A.