Classification of Operating System

B.Tech – CS 2nd Year Operating System (KCS- 401) Dr. Pankaj Kumar
Operating System
KCS – 401
Classification of OS
Dr. Pankaj Kumar
Associate Professor – CSE
SRMGPC Lucknow

Outline of the Lecture
• Batch
• Interactive
• Time Sharing
• Distributed
• Real Time system
• Embedded
• Network
• Mobile

This type of operating system does not interact with the computer directly. The similar jobs are
grouped together into batches with the help of some operator and these batches are executed one
by one. It is the responsibility of the operator to sort jobs with similar needs.
Batch Operating System
Examples of Batch based
Operating System:
Payroll System,
Bank Statements, etc.

Batch Operating System
Advantages:
• It is very difficult to guess or know the time required for any job to complete. Processors of
the batch systems know how long the job would be when it is in queue
• Multiple users can share the batch systems
• The idle time for the batch system is very less
• It is easy to manage large work repeatedly in batch systems
Disadvantages:
• The computer operators should be well known with batch systems
• Batch systems are hard to debug
• It is sometimes costly
• The other jobs will have to wait for an unknown time if any job fails

Interactive Operating System
In Interactive Operating System there is a direct interaction between the user and the computer.
Mostly all the Personal Computers are Interactive Operating System.
In this kind of Operating system, the user input some command in the system and the system
works according to it.

Time Shared Operating System
Each task is given some time to execute so that all the tasks work smoothly. Each user gets the
time of CPU as they use a single system. These systems are also known as Multitasking Systems.
The task can be from a single user or different users also. The time that each task gets to execute
is called quantum. After this time interval is over OS switches over to the next task.

Time Shared Operating System
Advantages:
• Since equal time quantum is given to each process, so each process gets equal opportunity
to execute.
• The CPU will be busy in most of the cases and this is good to have case. (CPU idle time
can be reduced)
• Fewer chances of duplication of software
Disadvantages:
• Process having higher priority will not get the chance to be executed first because the
equal opportunity is given to each process.
• Reliability problem
• One must have to take care of the security and integrity of user programs and data
• Data communication problem

Distributed Operating System
In a Distributed Operating System, we have various
systems and all these systems have their own CPU,
main memory, secondary memory, and resources.
These systems are connected to each other using a
shared communication network. Here, each system
can perform its task individually. The best part
about these Distributed Operating System is remote
access i.e. one user can access the data of the other
system and can work accordingly. So, remote
access is possible in these distributed Operating
Systems. Example:- LOCUS, etc

Distributed Operating System
Advantages:
• Since the systems are connected with each other so, the failure of one system can't stop the
execution of processes because other systems can do the execution.
• Resources are shared between each other.
• The load on the host computer gets distributed and this, in turn, increases the efficiency.
• Since resources are being shared, computation is highly fast and durable
Disadvantages:
• Since the data is shared among all the computers, so to make the data secure and accessible to
few computers, you need to put some extra efforts.
• If there is a problem in the communication network then the whole communication will be
broken.

Network Operating System
The primary purpose of the network operating system is
to allow shared file and printer access among multiple
computers in a network, typically a local area network
(LAN), a private network or to other networks. A
Network Operating System runs on a server and
provides the server the capability to manage data, users,
groups, security, applications, and other networking
functions.
To function network operating system requires an
existing operating system.
Example : Microsoft Windows Server 2003,
Microsoft Windows Server 2008, UNIX,
Linux, Mac OS X, and Novell NetWare

Network Operating System
Advantage:
• Centralized servers are very highly stabled.
• Server managed the security concerns.
• Remote access to servers is possible from different locations and types of systems.
• It can manage multiple requests (inputs) simultaneously & also provides security in a multi-
user environment.
Disadvantage:
• High cost of buying and running a server.
• Dependency on a central location for most operations.
• Regular maintenance and updates are required.

Difference between Network and Distributed Operating System
• Main objective is to provide the local services to
remote client.
• Main objective is to manage the hardware
resources.
• In Network Operating System, Communication
takes place on the basis of files.
• In Distributed Operating System, Communication
takes place on the basis of messages and shared
memory.
• Network Operating System is more scalable than
Distributed Operating System.
• Distributed Operating System is less scalable than
Network Operating System.
• In Network Operating System, fault tolerance is
less.
• While in Distributed Operating System, fault
tolerance is high.
• Rate of autonomy in Network Operating System is
high.
• While The rate of autonomy in Distributed
Operating System is less.
• Ease of implementation in Network Operating
System is also high.
• While in Distributed Operating System Ease of
implementation is less.
• In Network Operating System, All nodes can have
different operating system.
• While in Distributed Operating System, All nodes
have same operating system.

Real Time Operating System
A real-time operating system is a type of operating system that
processes data within a very short amount of time. It means that
a real-time operating system processes the data immediately
without any delay and then produces the output. If any input is
their it responds very quickly to it. The time taken by the system
to process and respond to inputs is termed as response time.
The time taken by the system to respond to an input and display
of required updated information is termed as the response time.
Example : Scientific experiments, medical
imaging systems, industrial control
systems, weapon systems, robots, air traffic
control systems, etc.

Real Time Operating System
Advantage:
• It is an error-free system.
• This system focuses on running applications. Memory allocation is best maintained in them.
• Maximum consumption of devises & system, execution of more outputs from all the
resources.
• The time assigned for shifting tasks in these systems are very less.
Disadvantage:
• Very few tasks can run at the same time.
• System resources are more expensive.
• Complex algorithm & difficult for the designers to write on.

Embedded Operating System
Embedded Systems are a specially designed computer system that essentially contains software
and hardware for performing specific tasks. As the name suggests Embedded Operating System is
an Embedded System’s Operating System.
It has limited features. It is usually designed for some particular operations to control an
electronic device.
Embedded Operating System is defined as a combination of hardware and software. Embedded
operating systems runs on embedded processors.

Embedded Operating System
Advantages:
1. Since it is dedicated to a particular job, so it is fast.
2. Low cost.
3. These consume less memory and other resources.
Disadvantages:
1. Only one job can be performed.
2. It is difficult to upgrade or is nearly scalable.

Mobile Operating System
Mobile operating systems are those OS which is especially that are designed to power
smartphones, tablets, and wearables devices.
Some most famous mobile operating systems are Android and iOS, but others include
BlackBerry, Web, and watchOS.

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