SJN Homoeopathic Medical College
SJN may refer to: * Shortest job next, a scheduling policy * ISO 639-3 code for Sindarin Sindarin is one of the fictional languages devised by J. R. R. Tolkien for use in his fantasy stories set in Arda, primarily in Middle-earth. Sindarin is one of the many languages spoken by the Elves. The word is a Quenya word. Called in Eng ...

Shortest Job Next
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. Shortest job next is advantageous because of its simplicity and because it minimizes 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 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 ...
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