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  2. System time - Wikipedia

    en.wikipedia.org/wiki/System_time

    In computer science and computer programming, system time represents a computer system's notion of the passage of time. In this sense, time also includes the passing of days on the calendar . System time is measured by a system clock , which is typically implemented as a simple count of the number of ticks that have transpired since some ...

  3. Timeline of operating systems - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_operating_systems

    AN/FSQ-32, another early time-sharing system begun; CTSS becomes operational (MIT's Compatible Time-Sharing System for the IBM 7094) JOSS, an interactive time-shared system that did not distinguish between operating system and language; Titan Supervisor, early time-sharing system begun; 1964 Berkeley Timesharing System (for Scientific Data ...

  4. Streamlines, streaklines, and pathlines - Wikipedia

    en.wikipedia.org/wiki/Streamlines,_streaklines...

    The dashed lines represent contours of the velocity field (streamlines), showing the motion of the whole field at the same time. (See high resolution version.) Solid blue lines and broken grey lines represent the streamlines. The red arrows show the direction and magnitude of the flow velocity. These arrows are tangential to the streamline.

  5. Epoch (computing) - Wikipedia

    en.wikipedia.org/wiki/Epoch_(computing)

    In computing, an epoch is a fixed date and time used as a reference from which a computer measures system time. Most computer systems determine time as a number representing the seconds removed from a particular arbitrary date and time. For instance, Unix and POSIX measure time as the number of seconds that have passed since Thursday 1 January ...

  6. Shortest remaining time - Wikipedia

    en.wikipedia.org/wiki/Shortest_remaining_time

    Shortest remaining time being executed. Shortest remaining time, also known as shortest remaining time first (SRTF), is a scheduling method that is a preemptive version of shortest job next scheduling. In this scheduling algorithm, the process with the smallest amount of time remaining until completion is selected to execute. Since the ...

  7. ARINC 653 - Wikipedia

    en.wikipedia.org/wiki/ARINC_653

    ARINC 653 (Avionics Application Software Standard Interface) is a software specification for space and time partitioning in safety-critical avionics real-time operating systems (RTOS). It allows the hosting of multiple applications of different software levels on the same hardware in the context of an Integrated Modular Avionics architecture.

  8. Scheduling (computing) - Wikipedia

    en.wikipedia.org/wiki/Scheduling_(computing)

    Windows NT-based operating systems use a multilevel feedback queue. 32 priority levels are defined, 0 through to 31, with priorities 0 through 15 being normal priorities and priorities 16 through 31 being soft real-time priorities, requiring privileges to assign. 0 is reserved for the Operating System. User interfaces and APIs work with ...

  9. Real-time operating system - Wikipedia

    en.wikipedia.org/wiki/Real-time_operating_system

    A real-time operating system (RTOS) is an operating system (OS) for real-time computing applications that processes data and events that have critically defined time constraints. An RTOS is distinct from a time-sharing operating system, such as Unix , which manages the sharing of system resources with a scheduler, data buffers, or fixed task ...