VMs and Device Drivers

Question 1

Scheduler

Answer 1

A program that manages the amount of time different processes have in the CPU - uses a scheduling algorithm

Question 2

What does a scheduler manage?

Answer 2

Which process to execute next and the length of time the next process can execute for

Question 3

Round Robin

Answer 3

Equally distributes processor time amongst all processes

Question 4

First Come First Served

Answer 4

Prioritises processes that arrive at the queue first

Question 5

Multi Level Feedback Queue

Answer 5

Shorter and more critical tasks are processed first

Question 6

Shortest Job First

Answer 6

Shorter jobs are placed at the front of the priority queue

Question 7

Shortest Remaining Time First

Answer 7

Processes with the shortest remaining time are higher priority

Question 8

5 Scheduling Algorithms

Answer 8

1) Round Robin
2) First Come First Served
3) Multi Level Feedback Queue
4) Shortest Job First
5) Shortest Remaining Time First

Question 9

Device Driver

Answer 9

Software that tells the OS how to communicate with a device e.g. printers, graphics cards and network cards

Question 10

Virtual Machine

Answer 10

A program that has the same functionality as a physical computer

Question 11

What do emulators do?

Answer 11

Trick a program into thinking it is running on its native hardware, when it is actually running on an entirely different machine

Question 12

When a virtual machines commonly used?

Answer 12

For testing programs on different OS, saving the time and money of purchasing multiple devices for testing

Question 13

Intermediate Code

Answer 13

Code halfway between machine code and object code - independent of the processor architecture so can be run across different machines
- Running Intermediate Code on a VM is considerably slower