Operating Systems
32 articles in this topic
Operating System Interview Questions for Freshers: Top 50 with Answers
50 operating system interview questions for freshers, every one answered and grouped into the follow-up chains interviewers walk: process vs thread, context-switch cost, scheduling trade-offs, synchronization to deadlock, paging to thrashing, plus file-system quick-fires and a two-week prep plan.
IBPS SO IT Officer Operating Systems: professional knowledge topics
IBPS SO IT Officer Operating Systems: master processes, CPU scheduling, memory management, deadlock and process synchronization for the Mains PK paper.
File systems and disk scheduling in OS: allocation, directories and seek time
A file system is the operating system's answer to a simple-sounding question: where on the disk does each file's data actually live, and how do we find it again quickly? Disk scheduling is the follow-up: when many read and write requests are queued, in what order should the head service them so the disk arm travels least? The two meet in one place: how the file system scatters a file's blocks decides how far the arm travels to read them back. Both are steady exam scorers.
Memory management in OS: paging and segmentation explained
Memory management is how an operating system decides where each process lives in physical memory and maps program addresses to hardware locations. Correct mapping lets many processes share memory safely; bad mapping wastes space through fragmentation or causes invalid access. Most exam questions reduce to one skill: translating a logical address into a physical one.
CPU scheduling algorithms: FCFS, SJF, Round Robin and priority explained
When several processes are ready to run and there is one CPU, the operating system has to choose who goes next. That choice is CPU scheduling, and the algorithm it uses decides how long each process waits and how responsive the system feels. It is almost entirely mechanical: draw a Gantt chart, read off the completion times, and two subtractions give you everything an exam question asks for. Four processes, four algorithms, and the same two averages come out different every time.
Process Synchronization and Semaphores: race conditions, Peterson's solution, wait and signal
Process synchronization explained: the race condition, critical-section problem, Peterson's solution, binary and counting semaphores, and a worked trace.
Memory Hierarchy and Virtual Memory: paging, the TLB, and address translation
Memory hierarchy and virtual memory explained: registers to disk, locality, paging, page tables, the TLB, a worked address translation, and access time.
Operating Systems for GATE: How to Study Deadlocks, Scheduling and Memory
Operating Systems is one of the densest, most-tested GATE CS subjects. Here is how to study its three biggest areas (scheduling, deadlocks and memory) so the marks actually come.