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  2. Time Stamp Counter - Wikipedia

    en.wikipedia.org/wiki/Time_Stamp_Counter

    On Linux systems, a program can get similar function by reading the value of CLOCK_MONOTONIC_RAW clock using the clock_gettime function. [3] Starting with the Pentium Pro, Intel processors have practiced out-of-order execution, where instructions are not necessarily performed in the order they appear in the program.

  3. Rate-monotonic scheduling - Wikipedia

    en.wikipedia.org/wiki/Rate-monotonic_scheduling

    In computer science, rate-monotonic scheduling (RMS) [1] is a priority assignment algorithm used in real-time operating systems (RTOS) with a static-priority scheduling class. [2] The static priorities are assigned according to the cycle duration of the job, so a shorter cycle duration results in a higher job priority.

  4. Unix time - Wikipedia

    en.wikipedia.org/wiki/Unix_time

    The decoding logic required to cope with this style of Unix clock would also correctly decode a hypothetical POSIX-conforming clock using the same interface. This would be achieved by indicating the TIME_INS state during the entirety of an inserted leap second, then indicating TIME_WAIT during the entirety of the following second while ...

  5. Earliest deadline first scheduling - Wikipedia

    en.wikipedia.org/wiki/Earliest_deadline_first...

    The AQuoSA project constitutes a modification to the Linux kernel enriching the process scheduler with EDF scheduling capabilities. The timing of the scheduling cannot be as precise as in the case of the above hard real-time Operating Systems, yet it is sufficiently precise so as to greatly enhance predictability, and thus fulfill the real-time ...

  6. Year 2038 problem - Wikipedia

    en.wikipedia.org/wiki/Year_2038_problem

    The XFS filesystem, starting with Linux 5.10, has an optional "big timestamps" feature which extends the timestamp range to the year 2486. [27] While the native APIs of OpenVMS can support timestamps up to 31 July 31086, [28] the C runtime library (CRTL) uses 32-bit integers for time_t. [29]

  7. Dynamic priority scheduling - Wikipedia

    en.wikipedia.org/wiki/Dynamic_priority_scheduling

    Higher schedulable utilization means higher utilization of resource and the better the algorithm. In preemptible scheduling, dynamic priority scheduling such as earliest deadline first (EDF) provides the optimal schedulable utilization of 1 in contrast to less than 0.69 with fixed priority scheduling such as rate-monotonic (RM). [1]

  8. Fair-share scheduling - Wikipedia

    en.wikipedia.org/wiki/Fair-share_scheduling

    Fair-share scheduling is a scheduling algorithm for computer operating systems in which the CPU usage is equally distributed among system users or groups, as opposed to equal distribution of resources among processes.

  9. Real-time operating system - Wikipedia

    en.wikipedia.org/wiki/Real-time_operating_system

    An RTOS like Linux 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 prioritization in multitasking or multiprogramming environments.