I/O scheduling and buffering in Operating Systems - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is I/O scheduling in operating systems?

I/O scheduling is the method an operating system uses to decide the order in which input/output requests are processed to improve efficiency and reduce wait times.

beginner

Explain buffering in the context of I/O operations.

Buffering is temporarily storing data in memory while it is being transferred between two devices or between a device and an application to handle speed differences and improve performance.

intermediate

Name two common I/O scheduling algorithms.

Two common I/O scheduling algorithms are First-Come, First-Served (FCFS) and Shortest Seek Time First (SSTF).

beginner

Why is buffering important in I/O operations?

Buffering helps to smooth out differences in speed between the producer and consumer of data, prevents data loss, and allows the CPU to continue working without waiting for slow devices.

intermediate

What is the difference between buffering and caching in I/O?

Buffering temporarily holds data during transfer to handle speed differences, while caching stores frequently accessed data to speed up future access.

What does I/O scheduling primarily aim to improve?

A The number of running processes

B The speed of the CPU

C The order of processing I/O requests to reduce wait time

D The size of the memory

I/O scheduling focuses on managing the order of I/O requests to improve efficiency and reduce waiting.

Which of the following best describes buffering?

A Permanently saving data on disk

B Storing data temporarily during transfer to handle speed differences

C Deleting unused data

D Encrypting data for security

Buffering temporarily holds data to manage differences in speed between devices.

Which I/O scheduling algorithm processes requests in the order they arrive?

A Priority Scheduling

B Shortest Seek Time First (SSTF)

C Round Robin

D First-Come, First-Served (FCFS)

FCFS processes I/O requests in the order they come without reordering.

What problem does buffering help to solve?

A Speed mismatch between devices

B CPU overheating

C Network congestion

D File corruption

Buffering helps manage speed differences between fast and slow devices during data transfer.

How does caching differ from buffering?

A Caching stores frequently used data; buffering temporarily holds data during transfer

B Caching deletes data; buffering encrypts data

C Caching slows down I/O; buffering speeds it up

D Caching is used only for input; buffering only for output

Caching keeps data for quick reuse, while buffering holds data temporarily during transfer.

Describe what I/O scheduling is and why it is important in operating systems.

Think about how the system decides which device request to handle first.

Explain buffering in your own words and give an example of when it might be used.

Consider how data flows between a fast CPU and a slower device.