priority scheduling - определение. Что такое priority scheduling
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Что (кто) такое priority scheduling - определение

Fixed priority pre-emptive scheduling; Fixed-priority scheduling

priority scheduling      
<operating system> Processes scheduling in which the scheduler selects tasks to run based on their priority as opposed to, say, a simple round-robin. Priorities may be static or dynamic. Static priorities are assigned at the time of creation, while dynamic priorities are based on the processes' behaviour while in the system. For example, the scheduler may favour I/O-intensive tasks so that expensive requests can be issued as early as possible. A danger of priority scheduling is starvation, in which processes with lower priorities are not given the opportunity to run. In order to avoid starvation, in preemptive scheduling, the priority of a process is gradually reduced while it is running. Eventually, the priority of the running process will no longer be the highest, and the next process will start running. This method is called aging.
Fixed-priority pre-emptive scheduling         
Fixed-priority preemptive scheduling is a scheduling system commonly used in real-time systems. With fixed priority preemptive scheduling, the scheduler ensures that at any given time, the processor executes the highest priority task of all those tasks that are currently ready to execute.
Marcan priority         
  • [[Gottlob Christian Storr]]
  • Pasqualotto, ''St. Mark writes his Gospel at the dictation of St. Peter'', 17th century.
  • The [[two-source hypothesis]], one of several built upon Marcan priority, holds that a hypothetical document (the [[Q source]]) was also used as a source by Matthew and Luke independently.
  • Two-Gospel (Griesbach) theory]], an alternative to Marcan priority, holds that Mark used Matthew and Luke as sources.
HYPOTHESIS THAT THE GOSPEL OF MARK WAS USED AS A SOURCE BY THE OTHER SYNOPTIC GOSPELS (MATTHEW AND LUKE)
Markan Priority; Marcan Priority; Markan priority; User:SlothMcCarty/Marcan priority
Marcan priority is the hypothesis that the Gospel of Mark was the first of the three synoptic gospels to be written, and was used as a source by the other two (Matthew and Luke). It is a central element in discussion of the synoptic problem; the question of the documentary relationship among these three gospels.

Википедия

Fixed-priority pre-emptive scheduling

Fixed-priority preemptive scheduling is a scheduling system commonly used in real-time systems. With fixed priority preemptive scheduling, the scheduler ensures that at any given time, the processor executes the highest priority task of all those tasks that are currently ready to execute.

The preemptive scheduler has a clock interrupt task that can provide the scheduler with options to switch after the task has had a given period to execute—the time slice. This scheduling system has the advantage of making sure no task hogs the processor for any time longer than the time slice. However, this scheduling scheme is vulnerable to process or thread lockout: since priority is given to higher-priority tasks, the lower-priority tasks could wait an indefinite amount of time. One common method of arbitrating this situation is aging, which gradually increments the priority of waiting processes and threads, ensuring that they will all eventually execute. Most real-time operating systems (RTOSs) have preemptive schedulers. Also turning off time slicing effectively gives you the non-preemptive RTOS.

Preemptive scheduling is often differentiated with cooperative scheduling, in which a task can run continuously from start to end without being preempted by other tasks. To have a task switch, the task must explicitly call the scheduler. Cooperative scheduling is used in a few RTOS such as Salvo or TinyOS.

Примеры употребления для priority scheduling
1. The commissioner also has made public relations a priority, scheduling appearances at synagogues, mosques and, recently, the headquarters of the Rev.