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Home Articles

Introduction to Operating System – Download PDF Notes

by Reethu S Arya
January 22, 2022
in Articles, Data Science and Machine Learning
Introduction to Operating System - Download PDF Notes
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Table of Contents

  • Operating System-History
  • Operating System-Notes

An Operating System generally referred to as OS is software that exists as an interface between computer hardware components and the user. Every computer system must have at least one operating system to run other programs. Applications like Browsers, MS Office, Notepad Games, etc., need some environment to run and perform their tasks. The OS will assist the user to communicate with the computer without knowing how to speak the computer’s language. It is not possible for the user to use any computer or mobile device without having an operating system. Some refer to an operating system as system software that manages computer hardware, software resources, and provides common services for computer programs.

Time-sharing operating systems arranges tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, printing, and other resources. For hardware functions such as input and output and memory. The operating system acts as an intermediary between programs and the computer hardware, even though the application code is usually executed directly by the hardware and frequently makes system calls to an OS function or is interrupted by it. Operating systems are found on many devices that contain a computer – from cellular phones and video game consoles to web servers and supercomputers.

Operating System-History

Every computer system must have at least one operating system to run other programs. Applications like Browsers, MS Office, Notepad Games, etc., need some environment to run and perform their tasks. The OS will assist the user to communicate with the computer without knowing how to speak the computer’s language. It is not possible for the user to use any computer or mobile device without having an operating system. Some refer to an operating system as system software that manages computer hardware, software resources, and provides common services for computer programs. Time-sharing operating systems arranges tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, printing, and other resources. For hardware functions such as input and output and memory. The operating system acts as an intermediary between programs and the computer hardware, even though the application code is usually executed directly by the hardware and frequently makes system calls to an OS function or is interrupted by it.

  • Initially, in the 1940s, the electronic digital systems had no operating systems.
  • Electronic systems at that  time were programmed on rows of mechanical switches or by jumper wires on plugboards.
  • They were special-purpose systems that, for example, generated ballistics tables for the military or controlled the printing of payroll checks from data on punched paper cards.
  • After programmable general-purpose computers were discovered , machine languages(consisting of strings of the binary digits 0 and 1 on punched paper tape) were introduced that sped up the programming process (Stern, 1981).
  • The OS/360 was used on most IBM mainframe computers beginning in 1966, including computers used by the Apollo program.
  • In the early 1950s, a computer could function only one program at a time.
  • Each user had one use of the computer for a limited period and would arrive at a scheduled time with their program and data on punched paper cards or punched tape.
  • The program would be loaded into the machine, and the machine would be ready to work until the program completed or crashed.
  • Programs could generally be debugged via a front panel using toggle switches and panel lights.
  • It is said that Alan Turing was a master of this on the early Manchester Mark 1 machine, and he was already deriving the primitive conception of an operating system from the principles of the universal Turing machine.

Operating System-Notes

1: Which of the following algorithms is most suitable for classification tasks?

2: Which metric is generally used to evaluate the performance of a regression model?

3: Which of the following is not a feature scaling method?

4: In machine learning, what is overfitting?

5: Which type of machine learning algorithm is used to predict a continuous output?

    Fill out the form to see the results

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    The OS will assist the user to communicate with the computer without knowing how to speak the computer’s language. It is not possible for the user to use any computer or mobile device without having an operating system. Some refer to an operating system as system software that manages computer hardware, software resources, and provides common services for computer programs. Time-sharing operating systems arranges tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, printing, and other resources. For hardware functions such as input and output and memory.

    Types of Operating System

    • Batch Operating System
      • A set of similar jobs are stored in the main memory for execution.
      • A job gets assigned to the CPU, only when the execution of the previous job completes.
    • Multiprogramming Operating System
      • The main memory consists of jobs waiting for CPU time.
      • The OS selects one of the processes and assigns it to the CPU.
      • Whenever the executing process needs to wait for any other operation (like I/O), the OS selects another process from the job queue and assigns it to the CPU.
      • This way, the CPU is never kept idle and the user gets the flavor of getting multiple tasks done at once.
    • Multitasking Operating System-
      • Multitasking OS combines the benefits of Multiprogramming OS and CPU scheduling to perform quick switches between jobs.
      • The switch is so quick that the user can interact with each program as it runs
    • Time Sharing Operating System-
      • Time-sharing systems require interaction with the user to instruct the OS to perform various tasks.
      • The OS responds with an output.
      • The instructions are usually given through an input device like the keyboard.
    • Real Time Operating System-
      • Real-Time OS are usually built for dedicated systems to accomplish a specific set of tasks within deadlines.

    A thread is a lightweight process and forms the basic unit of CPU utilization. A process can perform more than one task at the same time by including multiple threads.

    • A thread has its own program counter, register set, and stack
    • A thread shares resources with other threads of the same process the code section, the data section, files and signals.
    • A new thread, or a child process of a given process, can be introduced by using the fork() system call.
    • A process with n fork() system calls generates 2n – 1 child processes.
    • There are two types of threads:
      • User threads
      • Kernel threads
      • Java thread, POSIX threads.
      • Example : Window Solaris.
    SI No User level thread
    Kernel level thread
    1 User threads are implemented by users.
    kernel threads are implemented by OS.
    2 OS doesn’t recognize user level threads.
    Kernel threads are recognized by OS.
    3 Implementation of User threads is easy.
    Implementation of Kernel thread is complicated.
    4 Context switch time is less.
    Context switch time is more.
    5 Context switch requires no hardware support.
    Hardware support is needed.
    6 If one user level thread performs blocking operation then entire process will be blocked.
    If one kernel thread performs blocking operation then another thread can continue execution.

    Download detailed notes on Operating System 

    Download Entri App  for more topic wise practice papers

    I hope this article was helpful. The key point to clear an exam lies in methodical and planned preparation. If you are a candidate who wants to pursue your dream career and looking for a good start, our  Entri app has got it covered for you. Our team will help you with content and insights related to the topics of your concern. Subscribe to our app today and enrol yourself into various programmes our app offers. Tune in to the app to stay updated regarding various aspects of the subject you are interested in. Feel free to post any queries and doubts in the comment section. We will try our best to reach out. Push away all those self-doubts and negative thoughts. Try to have a clear vision. Ask yourself why you want this. Focus on the good and work hard. There is a saying that goes like this, Get up and set your shoulders to the wheel-how long is life for you? as you have come to this world leave some mark behind or where is the difference between your trees and stones they too come into existence decay and die. Each day is a precious gift bestowed upon us so make it count. Work on yourself. Stop procrastinating. Today is the day, hope for the best. Good luck

    Share82SendShare

    Reethu S Arya

    Reethu is a learner, orator and storyteller who keeps it all to herself unless it’s for exams and grades. She claims her spirit animal to be a cute fluffy panda (not your regular ones)and has been its disciple since day one! She thinks she connects more with words than with people. She believes her writings will someday help somebody in some way as they did with her!

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