Lecture 1 Flashcards
What is an operating system?
A program that acts as a link between a user of a computer and the hardware
What are the 3 goals of an operating system?
makes computer system transparent, convenient and efficient
What does an OS manage?
Manages a computers hardware
What are the 4 levels of a computer system?
User 1
Process 1
User m
Process n
System resources solve?
What do Systems and user application programs do?
they solve computing problems a user has
What does computer hardware provide?
Provides basic computing resources such as CPU, memory, I/o devices
OS is a _______ ________
OS is also a _______ ______
resource allocator
Control program
The programme running at all times is called the ______ of the OS
kernel
What is a kernel?
Main interface between computers physical hardware and the processes running on it
What is an interface?
Part of an OS that allows a user to enter and receive info
What is turnaround time?
The time it takes to receive files for processing
What is Multiprogramming?
Processes multiple jobs at once
What is timesharing?
program that services multiple interactive users
What are Real- time systems?
Response within certain bounded (limited) time period
What does open - source software do?
Allows individual to examine and modify software
What does “plug and play” do
Allows user to add and remove hardware components dynamically (as things change or develop)
What does cloud OS manage?
- Manages the operation of one or more virtual machines
- Manages the processes and threats of one or many virtual machines and servers
- Provides end users with pre installed applications and services that can be accessed through an internet browser
