System Utilization Guide in Operating Systems
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System Utilization Guide in Operating Systems

System Utilization Guide in Operating Systems

 System Utilization

The system can be used in a conversational mode or in a noncoversational mode. When using the system in the conversational mode, a terminal  device is used so that user can interact with the system on a dynamic basis. Noncoversational use of the system is initiated via a terminal or via the card reader as batch job to be run in multiprogramming mode.

In the conversational mode, the user connects his terminal by a dial-up procedure or by simply turning the terminal "on" in a hard wired  configuration. The user presses attention to initiate a "sign on" procedure and his keyboard is unlocked so that he can send information to the system-frequently referred to as "entering information into the system." The system operates as follows:

  1. The user's keyboard is unlocked so that he can enter information.
  2. The user types the information on the terminal device. As each character is typed, it is sent to the computer. The user presses return to end the message and a special character is sent to the computer. The keyboard is now "locked."
  3. The necessary processing is performed by the system next time the user's task is given control of the CPU.
  4. If a system function was requested, it is performed and the results are typed at the user's terminal. The keyboard is unlocked so that the user can enter his next command.
  5. If a processing program is executed, then it can request input from the terminal or from a data set. Similarly, it can send output to the user's terminal or write it to a data set. When the execution of the processing program is complete, the keyboard is unlocked so that the user can enter his next command.

When the user requests  that a system function be performed for him or that a processing program be executed, it is initiated the next time his task is given the CPU and is continued during subsequent time slices until that function or program is complete. The conversational mode is characterized in another way the system input device and the system output device for a task are user's terminal. When the user completes his work, he "signs off" with the log off command. The period between sign on and sign off is referred to as connect time. The actual CPU time used is usually considerably less than connect time. 

In the nonconversational mode, the user cannot interact with the system and is not connected to it with a terminal device. A nonconversational task may be time sliced or multiprogrammed depending upon the scheduling algorithm used. Nonconversational tasks are initiated in two ways:

  1. By entering a batch job into the system by the card reader.
  2. By initiating a nonconversational task with a command entered in the conversational mode.

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