1.2.1

    avatar
    Created by
    Salima Hassan

    Cards (67)

    • device managers works closely with special...
      system software
    • examples of device management...
      keyboard, mouse etc
    • what are device drivers
      these are small pieces of software that installs onto your computer
    • what is the purpose of a device management
      keeps track of which devices are connected to which ports
    • what other purposes does device management have
      allows applications to read/write data to each device
    • hardware interrupt
      how can they occur
      this can occur when an input or output operation completes
    • interrupt is an efficient way to tell the computer when a...
      job needs to be completed
    • interrupt service routine (ISR)
      what is it
      is a set of instruction that need to be done as part of an interrupt process write
    • is polling an efficient way of interrupts
      no its inefficient
    • software interrupts
      where does this come from
      this comes from a piece of software that need to terminate or request services from the OS to complete a task
    • what is an example of software interrupt
      opening a document
    • what is an interrupt
      this is a signal from a piece of soft/hardware that tells the CPU that it needs some attention
    • what is polling
      this is when CPU polls every piece of software and hardware if it needs anything to be done
    • what is the process manager purpose
      modern operating systems allow users to run multiple programs at once
    • what is the purpose of managing memory
      controls the allocation of the RAM to each running process
    • what are 3 examples of Mangers
      device manager
      memory manager
      process manager
    • what does API stand for
      application programming interface
    • what does device manager do
      allocates resources to external hardware devices and allows them to be used by applicators
    • what does process manager do
      controls the allocation of CPU
    • what is an API
      set of code libraries that software developers can use to write applications for that OS
    • what is Manger
      controls pieces of hardware that OS are responsible of
    • what is operating systems(OS)
      this is essentiaal piece of software that is loaded when a computer boots up
    • what is the purpose of operating system
      to control the hardware within a computer
    • in segmnetation ther is no...
      physical split
    • programs can be split across lots of pages that are non-contiguous
      what does non-contiguous mean
      managed by?
      not all together
      manager by a table map
    • segmentation can use ___ to store unuser part of program in the ____ to free ___ for something else
      what are the words
      virtual memory
      virtual memory
      space
    • what is multitasking
      modern OS allow multiple applications to run at once
    • what is Paging
      this splits the main memory (RAM) into 4kb sections known as pages
    • what is segementation
      each program is given a logical division of memory to operate in
    • first come first served
      how are jobs completed
      jobs are completed in the order they came on regardless of the time taken to complete
    • first come first served
      what are 2 disadvantages
      can cause delays when getting job done
      FCFS generate bad performance with a computer system
    • first come first served
      what is one advantage
      it is easy to manage and set up
    • is round robin east to manage and set up
      yes
    • multi-level feedback queues
      if a job is waiting too long it will...
      be moved to higher priority location in another queue to get the job completed quicker
    • multilevel feedback queues
      is the most complex form of schedulling but...
      give the best results
    • multilevel feedback queues
      may offer best results but is...
      very CPU intentive
    • round robin
      if a job is completed, the next job is loaded, so if a job is not completed
      what happens
      it is pushed to the bottom of the queue and waits for the next slot of CPU time
    • shortest job first
      not very feasible for implementation as...
      OS rarely know how long each job is
    • shortest job first
      what is it
      is a scheduller that selects the shortest job in the queue to complete first
    • shortest remaining time
      uses very little CPU usage,
      why
      as it is only compares a job when its done or arrived
    See similar decks