Shortest job next ( SJN ), also known as shortest job first ( SJF ) or shortest process next ( SPN ), is a scheduling policy that selects for execution the waiting process with the smallest execution time. SJN is a non- preemptive algorithm. Shortest remaining time is a preemptive variant of SJN.
5-413: SJN may refer to: Shortest job next , a scheduling policy ISO 639-3 code for Sindarin , a fictional language devised by J. R. R. Tolkien Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title SJN . If an internal link led you here, you may wish to change the link to point directly to
10-415: A pattern of alternating between waiting for a command and executing it. If the execution burst of a process is regarded as a separate "job", the past behaviour can indicate which process to run next, based on an estimate of its running time. Shortest job next is used in specialized environments where accurate estimates of running time are available. Weighted shortest job first (WSJF) is a modification of
15-447: Is that the total execution time of a job must be known before execution. While it is impossible to predict execution time perfectly, several methods can be used to estimate it, such as a weighted average of previous execution times. Multilevel feedback queue can also be used to approximate SJN without the need for the total execution time oracle. Shortest job next can be effectively used with interactive processes which generally follow
20-404: The average amount of time each process has to wait until its execution is complete. However, it has the potential for process starvation for processes which will require a long time to complete if short processes are continually added. Highest response ratio next is similar but provides a solution to this problem using a technique called aging . Another disadvantage of using shortest job next
25-417: The intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=SJN&oldid=1060106013 " Category : Disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Shortest job next Shortest job next is advantageous because of its simplicity and because it minimizes
#62937