Analysis average waiting time search performance in the queue process on CPU scheduling using the Round Robin, shortest job first and first in first out algorithm (original) (raw)
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Task scheduling is needed to maintain every process that comes with a processor in parallel processing. In several conditions, not every algorithm works better on the significant problem. Sometimes FCFS algorithm is better than the other in short burst time while Round Robin is better for multiple processes in every single time. However, it cannot be predicted what process will come after. Average Waiting Time is a standard measure for giving credit to the scheduling algorithm. Several techniques have been applied to maintain the process to make the CPU performance in normal. The objective of this paper is to compare three algorithms, FCFS, SJF, and Round Robin. The target is to know which algorithm is more suitable for the certain process.
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Since the emergence of Multicore processors, operating systems have been transformed altogether, researchers and manufacturers are in effort to meet the resource capabilities and improve upon overall performance of the systems. Till to date many core processors have emerged which is revolutionizing the computation. Among many performance issues of operating systems; one of them is proper and efficient scheduling of processes and threads which impacts heavily on overall Quality of the system. In past much of the work has been done in devising new scheduling algorithms for multicore processors but little attention has been given to merge classic scheduling algorithms for multicore processor systems. In this paper, we shall focus how Round Robin (RR) algorithm can work with Shortest Job First (SJF) algorithm and First-Come-First-Serve (FCFS) for multicore processor systems. We have tried to devise a new algorithm by using prioritization techniques for multi-core processors. Observation...
AN IMPROVED ROUND ROBIN CPU SCHEDULING ALGORITHM
One of the most important components of the computer resource is the CPU. CPU scheduling involves a careful examination of pending processes to determine the most efficient way to service the requests. CPU scheduling is the basis of multiprogrammed operating systems. Most CPU scheduling algorithms concentrate on maximizing CPU utilization and throughput and minimizing turnaround time, waiting time, response time and number of context switching for a set of requests. Some of the popular CPU scheduling algorithms are First-Come-First-Served (FCFS), Shortest Job First (SJF), Priority Scheduling and Round Robin (RR). FCFS is the simplest form of CPU scheduling algorithm. This algorithm is simple to implement, but it generally does not provide the fastest service. Round Robin being the most popular choice in time shared system, but it may not be suitable for real time systems because of larger waiting time, turnaround time and more number of context switches. This paper describes an improvement in RR. A simulator program has been designed and tested the Improved Round Robin (IRR). After improvement in RR it has been found that the waiting time and turnaround time have been reduced drastically.
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A number of programs can be in memory at the same time, allows overlap of CPU and I/O. CPU scheduling deals with the problem of choosing a process from the ready queue to be executed by the CPU. It is difficult and time consuming to develop CPU scheduling algorithm and to understand its impact because of need to modify and test operating system and measure the performance of real applications. As processor is the important resource, CPU scheduling becomes very important in accomplishing the operating system (OS) design goals. The goal of CPU scheduling is to minimize the average turnaround time and average waiting time in order to allow as many as possible running processes at all time in order to make best use of CPU. This paper attempts to summarize major CPU scheduling algorithms proposed till date. We look at the algorithms such as FCFS, SJF, SRTF, Round Robin, Priority scheduling, HRRN and LJF.
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Scheduling is a fundamental operating system function, since almost all computer resources are scheduled before use. The CPU is one of the primary computer resources. Central Processing Unit (CPU) scheduling plays an important role by switching the CPU among various processes. A processor is the important resource in computer; the operating system can make the computer more productive. The purpose of the operating system is to allow the process as many as possible running at all the time in order to make best use of CPU. The high efficient CPU scheduler depends on design of the high quality scheduling algorithms which suits the scheduling goals. In this project, two fundamental CPU scheduling algorithms (First-Come-First-Serve and Shortest Job First) for a single CPU were reviewed and compared to show which algorithm is more suitable for certain processes and how their scheduling are being implemented. A theoretical analysis that subject the algorithms to the same condition is performed through the use of exemplary job processes to determine the best among the algorithms. Average Waiting time and Average Turnaround time scheduling criteria were used to evaluate the algorithms and it was discovered that Shortest Job First scheduling algorithm gives more optimal performance of scheduling processes than the First-Come-First-Serve scheduling algorithm.
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Scheduling is considered a major problem in multiprogramming operating systems.CPU scheduling play a vital role in optimization of system performance. This paper aims to review classical and novel CPU scheduling algorithms to address scheduling challenges such as resource allocation, average waiting time, throughput, etc. The study evaluates CPUscheduling algorithms through some simulations and previous comparative analysis. The results shows that Round Robin and Multilevel Feedback Queue Scheduling Algorithm performs well in reducing starvation and increasing CPU performance/utilization.