Introduction of Shortest Remaining Time First (SRTF) algorithm Last Updated : 28 Dec, 2024 Comments Improve Suggest changes Like Article Like Report Shortest Remaining Time First (SRTF) is the preemptive version of Shortest Job Next (SJN) algorithm, where the processor is allocated to the job closest to completion. This algorithm requires advanced concept and knowledge of CPU time required to process the job in an interactive system, and hence can't be implemented there. But, in a batch system where it is desirable to give preference to short jobs, SRT algorithm is used. However, SRT involves more overheads than SJN, as the OS is required to frequently monitor the CPU time of the jobs in the READY queue and perform context switching. As illustrated above, for the same set of jobs, SRT algorithm is faster in execution than SJN algorithm. But, here the overhead charges, i.e., time required for context switching has been ignored. When a job is preempted, all of it's processing information must be saved in it's PCB for later when it is to be continued, and the contents of the PCB of the other job to which the OS is switching are loaded into the registers in the memory. This is known as Context Switching. Advantages: SRTF algorithm makes the processing of the jobs faster than SJN algorithm, given it's overhead charges are not counted. Allows for easier management of library updates or replacements without recompiling the program. Enables efficient memory usage, as libraries can be shared among multiple instances of the program. Provides better portability, as the program can be executed on different systems with compatible libraries available at runtime. Disadvantages: The context switch is done a lot more times in SRTF than in SJN, and consumes CPU's valuable time for processing. This adds up to it's processing time and diminishes it's advantage of fast processing. Slightly slower program startup due to the additional linking process. Requires proper handling of library dependencies to ensure correct execution. Debugging can be slightly more complex, as libraries are separate entities loaded at runtime. Comment More infoAdvertise with us Next Article Introduction of Shortest Remaining Time First (SRTF) algorithm T Tarun_Singhal Follow Improve Article Tags : Operating Systems GATE CS cpu-scheduling Similar Reads Shortest Remaining Time First (Preemptive SJF) Scheduling Algorithm In this post, we will talk about the pre-emptive version of Shortest Job First (SJF) scheduling, called Shortest Remaining Time First (SRTF). In SRTF, the process with the least time left to finish is selected to run. The running process will continue until it finishes or a new process with a shorte 8 min read Shortest Remaining Time First (SRTF) With predicted Time CPU scheduling algorithms are essential components of operating systems that determine the order in which processes are executed on a computer's central processing unit (CPU). These algorithms aim to optimize CPU utilization, reduce waiting times, and enhance system performance by efficiently managi 9 min read Shortest Job First (or SJF) CPU Scheduling Non-preemptive algorithm using Segment Tree Shortest job first (SJF) or shortest job next, is a scheduling policy that selects the waiting process with the smallest execution time to execute next. SJN is a non-preemptive algorithm.  Shortest Job first has the advantage of having a minimum average waiting time among all scheduling algorithms. 15+ min read SSTF Full Form - Shortest Seek Time First SSTF (Shortest Seek Time First) is an abbreviation that selects the request which is closest to the current head position before moving the head away to service other requests. This is done by selecting the request which has the least seek time from the current head position. SSTFSSTF scheduling pri 3 min read Longest Remaining Time First (LRTF) or Preemptive Longest Job First CPU Scheduling Algorithm Longest Remaining Time First (LRTF) is a preemptive version of Longest Job First (LJF) scheduling algorithm. In this scheduling algorithm, we find the process with the maximum remaining time and then process it, i.e. check for the maximum remaining time after some interval of time(say 1 unit each) t 7 min read Least Slack Time (LST) scheduling Algorithm in real-time systems Least Slack Time (LST) is a dynamic priority-driven scheduling algorithm used in real-time systems. In LST, all the tasks in the system are assigned some priority according to their slack time. The task which has the least slack time has the highest priority and vice versa. Priorities to the tasks a 3 min read Difference between Shortest Job First (SJF) and Round-Robin (RR) scheduling algorithms The performance of the multiprocessor system and time-sharing system rely upon CPU scheduling algorithm. Some of the well known efficient CPU scheduling algorithms are Round Robin scheduling (RR), Shortest job first(SJF), Preemptive version of SJF(SRTF), First Come First Serve (FCFS) etc. As of now, 4 min read Longest Remaining Time First (LRTF) CPU Scheduling Program We have given some processes with arrival time and Burst Time and we have to find the completion time (CT), Turn Around Time(TAT), Average Turn Around Time (Avg TAT), Waiting Time(WT), Average Waiting Time (AWT) for the given processes. Prerequisite: CPU Scheduling | Longest Remaining Time First (LR 15+ min read LRTF Scheduling Full Form - Longest Remaining Time First LRTF stands for Longest Remaining Time First. In the LRTF scheduling algorithm, the job that has the highest burst time is allocated CPU first. We keep monitoring the burst times periodically and assign the then highest burst time process to the CPU. It is a preemptive mode of the Longest Job First 2 min read Shortest Job First or SJF CPU Scheduling Shortest Job First (SJF) or Shortest Job Next (SJN) is a scheduling process that selects the waiting process with the smallest execution time to execute next. This scheduling method may or may not be preemptive. Significantly reduces the average waiting time for other processes waiting to be execute 4 min read Like