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In previous post, we have discussed of SJF i.e. In this post we will discuss the preemptive version of SJF known as Shortest Remaining Time First (SRTF).
In this scheduling algorithm, the process with the smallest amount of time remaining until completion is selected to execute. Since the currently executing process is the one with the shortest amount of time remaining by definition, and since that time should only reduce as execution progresses, processes will always run until they complete or a new process is added that requires a smaller amount of time. Preemptive SJF: Example Process Duration Order Arrival Time P1 9 1 0 P2 2 2 2 P1 waiting time: 4-2 = 2 P2 waiting time: 0 The average waiting time(AWT): (0 + 2) / 2 = 1 Advantage: 1- Short processes are handled very quickly. 2- The system also requires very little overhead since it only makes a decision when a process completes or a new process is added. 3- When a new process is added the algorithm only needs to compare the currently executing process with the new process, ignoring all other processes currently waiting to execute. Disadvantage: 1- Like shortest job first, it has the potential for process starvation. 2- Long processes may be held off indefinitely if short processes are continually added.
Filternone Output: Processes Burst time Waiting time Turn around time 1 6 3 9 2 8 16 24 3 7 8 15 4 3 0 3 Average waiting time = 6.75 Average turn around time = 12.75 This article is contributed. If you like GeeksforGeeks and would like to contribute, you can also write an article using or mail your article to [email protected]. See your article appearing on the GeeksforGeeks main page and help other Geeks. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
Jun 16, 2018 - C program for shortest remaining time first scheduling algorithm. If a new process arrives with CPU burst length less than remaining time of current. This scheme is know as the Shortest-Remaining-Time-First (SRTF). Here you will get C and C++ program for priority scheduling algorithm. Not being dealt with by the CPU. Round Robin Scheduling Program in C.. Shortest remaining time first (SRTF), is a scheduling method that is a preemptive version of shortest job next scheduling.