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Chapter 1: Introduction to Operating System - Coggle Diagram

- - - - Asymmetric multiprocessing
        -Some systems use asymmetric multiprocessing, in which each processor is assigned a specific task.
      - 2. Symmetric Multiprocessing (SMP)
        -The most common systems use symmetric multiprocessing, in which each processor performs all tasks within the operating system. SMP means that all processors are peers; no master-slave relationship exits between processors,
  - - - Asymmetrically Clustering.
        •What is one machine is in hot-standby mode while the other is running the applications.
        •The hot-standby host machine does nothing but monitor the active server.
        •If that server fails, the hot-standby host becomes the active server.
      - Symmetric Mode
        •What us two or more hosts are running applications, and are monitoring each other.
        •This mode is obviously more efficient, as it uses all of the available hardware.
        •It does require that more than one application be available to run.
    - - Parallel clusters
      - clustering over a wide-area network (WAN)
- - - - Permits users to study
      - Permits users to change
      - Improve the software
      - permits users to distribute copies
  - - - Developed by volunteers who works for peer recognition
      - Users may suggests additional features that often get implemented.
      - Software is released on a daily or weekly basis
      - Quality driven. Highly secure,
      - A highly secure system by modifying the source code
    - - Developed by companies/ developers who works for economic purposes
      - Users may suggest requirements but they may or may not be implemented
      - Release is not too often. There may be only yearly releases.
      - Market driven. Highly security risk
      - Security cannot be enhanced by modifying the source code.
- - - - user
- - - - 1) Process control
        -end, abort
        -load, execute
        -create process. terminate process
        -get process attributes, set process attributes
        -wait for time
        -wait event, signal event
        -allocate memory, free memory
      - 2) File Manipulation
        -create file, delete file
        -open, close
        -read, write, reposition
        -get file attributes, set file attributes.
      - 3)Device Manipulation
        -request device, release device.
        -read, write, reposition
        -get device attributes, set device attributes
        -logically attach or detach devices
      - 4) Information Maintenance
        -get time or date, set time or date
        -get system data, set system data
        -get process, file, or device attributes
        -set process, file, or device attributes
      - 5) Communications
        -create, delete communication connection
        -send, receive messages
        -transfer status information