Scheduling criteria

[bob]

You know scheduling criteria really shape how tasks grab processor time when you run multiple jobs at once. I recall wrestling with these ideas back when I started out. But you see utilization as one big measure that keeps the processor humming without too much idle waste. Perhaps fairness comes into play too since you want every process to get its fair share over time. Also throughput shows how many tasks finish per hour which matters when loads pile up.
Now response time grabs your attention because it decides how quick a user feels the system reacts to inputs. I think you notice waiting time builds up if a process sits too long in queues before it runs. Turnaround time tracks the full journey from submission to completion and you measure it to spot bottlenecks. Or maybe priority schemes let you boost critical jobs ahead of others when deadlines loom. Then you balance these factors since favoring one often hurts another like high utilization clashing with quick responses.
I find starvation happens when low priority tasks never get picked which frustrates you in long runs. But you adjust algorithms to prevent that by aging processes or tweaking priorities dynamically. Also efficiency ties into all this as you avoid overhead from constant switches that eat into real work. Perhaps context switching costs add up fast if criteria ignore them during heavy loads. You see these criteria interact in complex ways when you design schedulers for real systems.
This setup lets you optimize for different goals depending on the environment you work in like batch jobs versus interactive apps. I reckon you tweak waiting times down by using round robin approaches that cycle through ready tasks evenly. Or fairness ensures no single job hogs resources which you enforce with quotas or limits. Then throughput rises when you minimize idle periods through better selection rules.
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