The document discusses batch operating systems (BOS), explaining their definition, usage, types, advantages, and disadvantages. Batch processing involves executing a series of programs without manual intervention, enabling efficient handling of large jobs. While BOS reduce processor stress and idle time, they require trained operators and can be challenging to debug.

1. BATCH OPERATING
SYSTEM

2. TOPICS OF DISCUSSION
What is BOS
Why BOS are used
Types of BOS
Advantages and Disadvantages of BOS
Example of BOS
Conclusion

3. WHAT IS BOS ?
Batch processing . Batch processing is the execution of
series of programs (“jobs”) on computer without manual
intervention.jobs are set up so they can be run to
completion without human interaction. All input
parameters are predefined through scripts , command line
arguments ,control file or job control languages

4. Working of BOS

5. WHY BOS ARE USED ?
As batch operating systems load less stress on processor
and involve less user interaction so that is why we can use
batch operating system in current day also
Another advantage of batch operating system is that the
large repeated jobs are given to the system and we don’t
have to interact with computer to tell the system that you
have to do that job after finishing that job

6. Old batch system were not interactive that is the user
interaction was not involved when the job is running . Now
in modern batch systems we have interaction also
For example we can set the timer on the job and when the
specific time comes. Then computer send the message to
the processor that time is over . This helps us to avoid to
many debug

7. TYPES OF BOS
There are mainly two types of batch operating system .these
are as follows
Simple batch system
Multi – programming batched system

8. SIMPLE BATCHED SYSTEM
The user did not directly interact with the computer system for job
execution in a simple batch operating system . However, the user
was required to prepare a job that included the program, control
information and data on the nature of the job on control cards. The
job was then submitted to the computer operator, who usually in
form of punch card. The program’s output included results and
register and memory dump in the event of a program error. The
output appeared after some time that could take days, hours, and
minutes.

9. MULTI-PROGRAMMED BATCHED SYSTEM
Spooling deals with many jobs that have already been read and waiting to run on
disk. A disk containing a pool of jobs allows the operating system to choose
which job to run maximize CPU utilization. Jobs that come on magnetic tape or
cards directly cannot be run in a different order. Jobs run sequentially because
they are executed in first come, first served manner. When various jobs are
stored on direct access device, job scheduling become possible like disk. Multi-
programming is an important feature of job scheduling. For overlapped I/O,
spooling and offline operations have their limitations. Generally, a single user
could not maintain all input/output devices, and CPU buys all time

10. ADVANTAGES OF BOS
⮚Processor consume good time while processing that mean it
knows which job to process next . In real time system we don’t
have expected time of how long the job is and what is estimate
to complete the task . But in Batch systems the processor knows
how long the job is as it is queued
⮚Sharing of Batch system for multiple users
⮚The idle time batch system is very less
⮚You can assign specific time for batch jobs
⮚The Batch system can manage large repeated work easily

11. DISADVANTAGES OF BOS
Computer operation must be trained for using batch
systems.
It is difficult to debug batch systems
Batch systems are sometime costly
If some job takes too much time. That is if error occur in
jobs will wait for unknown time

12. PRESENTED BY:
ANJALI ANAND
HANSHIKA GUPTA
THANKYOU