![]() ![]() Less used for job scheduling, more used for process scheduling. # include # include typedef struct PCB Īdvantages: to ensure that new short jobs can be served quickly as soon as they enter the system, and the average waiting time is short.ĭisadvantages: In order to ensure the process breakpoint is live, counting the remaining time of the process increases the system overhead, which is not conducive to long operations. The Scheduling program tested with 3 processes. Long process may wait forever.Realization idea: When a new process enters the ready queue, if it needs processing time shorter than the processing time of the current process, the current process is suspended and the CPU is allocated to the new process. The CPU PRIORITY scheduling algorithm is implemented using the C Program. Starvation is possible for long process.Again it is difficult to estimate remaining time necessary to complete execution.Quite good response for short processes.This procedure is repeated till all processes complete their executionĪverage Turnaround Time: (22+8+2+8) / 4 = 40/4 = 10 ms.Īverage Waiting Time: (12+2+0+4)/4 = 18 / 4 = 4.5 ms. Whenever new process comes or current process blocks, such type of decision is taken. So, P0 is preempted and P1 is allowed to run. ![]() But, when P1 comes, it has shortest remaining run time. Initially only process P0 is present and it is allowed to run. Time required for completion (∆T)(CPU Burst Time) Consider all time values in milliseconds. Their arrival time and time required to complete the execution are given in following table. When CPU becomes free, a process from the first position in a queue is selected to run.Ĭonsider the following set of four processes. ![]() All processes in a queue are sorted in ascending order on their remaining run time. This strategy can also be implemented by using sorted FIFO queue. If the new job needs less time to finish than the current process, the current process is suspended and the new job is started. ![]() Preemptive: When a new process arrives, its total time is compared to the current process remaining run time. This is a preemptive version of SJF scheduling. The process, whose remaining run time is shortest, is served first. Algorithm: STEP 1- START STEP 2- Declare the value of bt, p, wt, tat, pr, I, j, n, total0, os, average waiting time and average turnaround time. Question-1 Explain Shortest Remaining Time Next (SRTN) scheduling algorithms with illustration.
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