Types of Operating Systems: Batch, Time-Sharing, RTOS & Distributed Systems

1. Batch Processing Operating System: • Principle: Similar jobs with same requirements are collected into batches by an operator and executed sequentially without interactive user control. • Advantage: High CPU throughput for non-interactive jobs. • Limitation: High turnaround time, difficult debugging (e.g. IBM OS/360, Payroll batch). 2. Multi-Programming Operating System: • Principle: Keeps multiple processes resident in primary RAM simultaneously. When the active process waits for I/O, the OS immediately switches the CPU to another ready job, keeping CPU utilization near 100%. 3. Time-Sharing (Multi-Tasking) Operating System: • Principle: An extension of multiprogramming where CPU time is divided into microscopic time slices (Time Quanta: 10 - 50 ms) allocated round-robin across multiple users. • Advantage: Interactive response time, multi-user concurrency (e.g. Linux, Windows 11, UNIX). 4. Real-Time Operating System (RTOS): • Principle: Operating systems designed for applications where computational results must be delivered within strict, deterministic time constraints. • Sub-Types: a) Hard RTOS: Guarantees critical tasks complete strictly on time. Missing a deadline causes catastrophic failure (e.g. Missile Guidance, Automobile Airbag deployment, Aircraft Flight Control, Pacemakers). b) Soft RTOS: Deadlines are important, but occasional misses cause quality degradation rather than catastrophic failure (e.g. Video Streaming, Online Gaming, Audio playback). 5. Distributed & Network Operating Systems: • Principle: Manages a collection of independent networked computers, presenting them to users as a single unified system (e.g. Cloud Kubernetes clusters).