Job Scheduling

Operating Systems job scheduling algorithms explained

This is an easy conceptual question on job scheduling — a core operating systems topic that tests whether you can distinguish between real scheduling approaches and imposters. It's foundational material that appears in systems interviews and OS courses, and understanding the key algorithms helps you reason about process management, CPU utilization, and fairness.

Job scheduling algorithms sit at the heart of how operating systems decide which process runs next. Real algorithms each make different trade-offs: some prioritize minimizing average turnaround time, others reduce wait time for interactive jobs, and some aim for fairness across users. Knowing the names, key properties, and typical use cases of algorithms like FIFO, SJF, round-robin, and priority-based approaches is essential for any systems interview.

• FIFO (First In, First Out) and Convoy Effect
• Shortest Job First (SJF) and preemption
• Round-Robin and time-slice selection
• Priority scheduling and starvation
• Multi-level queue and feedback scheduling