Research papers on cpu scheduling algorithms

Back to basics A long time ago in a galaxy far, far away…. And guess what, databases have to deal with both situations! The concept The time complexity is used to see how long an algorithm will take for a given amount of data. To describe this complexity, computer scientists use the mathematical big O notation.

Research papers on cpu scheduling algorithms

Research papers on cpu scheduling algorithms

With the increasing number of application, there exist a large number of processes in the computer system at the same time. Many processes in system simultaneously raise a challenging circumstance Research papers on cpu scheduling algorithms man- aging the CPU in such a manner that the CPU utilization and processes execution gets optimal performance.

The world is still waiting for most efficient algorithm which remains a challenging issue. In this scheduling algorithm, the priority is been calculated and the processes with high priority get CPU first or next.

For new process, the priority of it becomes equal to inverse of burst time and for the old processes the priority calculation takes place as a ratio of waiting time and remaining burst time.


The objective is to get all the processes executed with minimum average waiting time and no starvation. It gives better evaluation results in the form of scheduling criteria.

We have used the deterministic model to compare the different algorithms. Introduction In the early days, due to the heavy cost of the hardware, the full attention was drawn on the better utilization of resources.

After a vast advancement of technology, the cost of hardware get reduced to affordable price and the interest of author turned to fast calculation and response.

The system is controlled by the multiprogramming and multitasking approach of operating system. The CPU plays an important role in implementation of multiprogramming and multitasking [1].

The use of computer has affected most of the working of our daily life and the use in almost all sort of field has invited a number of applications for every level of users.

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As many applications worked simultaneously which required many numbers of processes to be created, the processes must be executed in such a manner to provide the better response to users. The increment of processes in the system increased the responsibility of CPU scheduler.

There exist a number of scheduling algorithms [2] [3] but Round Robin, Shortest Remaining Time First and the Priority scheduling may have the weightage of the most widely used scheduling algorithms. They have their advantages and disadvantages too. The concept of designing a scheduling algorithm has a significant age around thirty years; even then we are motivated to found some scope of improvement in the CPU scheduling approach.

We believe that there always exists some hope where normal people found dead, because it depends on the view of researchers. A significant work has been done by many researchers over last two decades but we find a new hope and through this paper a new scheduling algorithm Varying Response Ratio Priority is introduced.

In this paper, we have tried to collect the advantage of Shortest Remaining Time First and Priority by merging them and to eliminate the starvation condition by using indirect aging. In this scheduling algorithm for new processes the decision of allocating the CPU depends similarly as in shortest remaining time first and for the old processes waiting in ready queue decision gets affected by the ratio of waiting time and remaining burst time.

The main objective of this paper is to provide the scheduling without starvation and average waiting time if not equal to but nearer to the average waiting time of shortest remaining time first.

In this manuscript, we use the deterministic model to compare the VRRP to other scheduling algorithms. The next section contains the brief description of some of the most common scheduling algorithms.

Research papers on cpu scheduling algorithms

In Section 3, we have explained the working and calculation of our approach. Section 4 explains the comparative results with some most favourite scheduling and finally our conclusion comes in the Section 5. Overall the CPU remains a central attraction as a most important resources and managing the processes for CPU allocation becomes a most important task of operating system.

The short term scheduler [4] [5] is responsible to allocate the CPU to the processes under some methodology.

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These methodologies are named as scheduling algorithms. In present scenario there are different scheduling algorithms been used n different operating system with some merits and demerits. There are some basic algorithms and some are the upgraded version of the basic algorithms.

These algorithms vary in efficiency in different environment in different conditions. A system engineer has to consider so many factors before designing the any scheduling algorithm. There may be some expectations of designer and user from the scheduler such as maximum throughput, no starvation, least overhead, calculation and assignment of priority, tradeoffs between response and utilization and desirable behaviour.

It is very important to see the factors which play a great role in deciding the grade of scheduling algorithms. Throughput TP [2] [6] is the factor which gives the idea about the number of processes executed in per seconds.

Turnaround Time TT of a process relates to the total life time of a process as time interval from the submission of process in ready queue to the termination of process which includes the total execution time, waiting time and response time.

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Response time RT is the time interval from the submission time of process in ready queue to the starting of execution for the first time.

Waiting time WT is the time during the life time of process when the process is sitting idle waiting for its turn to get the CPU for execution in ready queue.

CPU is most important a resource which is required to be kept busy all the time and it decides the efficiency of system in terms of ratio of time CPU is busy executing the processes to total system time, this ratio is called CPU utilization CU.

It requires saving the status of old process into its PCB from system to stop executing the old process and loading the status of new process from its PCB into system to start executing new process.

Context switches are an overhead on the system. · Efficient Optimal Algorithm of Task Scheduling in Cloud Computing Environment performance of various CPU scheduling in cloud environment using Cloud Sim the basic algorithm OS like FCFS, Priority Scheduling and Shortest Job various algorithms for allocating, scheduling  · Scheduling in multiprocessor real-time systems is an old problem in multicore processors have brought a renewed interest, along with new dimensions, to the challenge,  · Disk Scheduling Revisited† With small numbers of requests, research concentrated on firstcome firstserve (FCFS), shortest seek time first (SSF), and the scanning algorithms which service requests in cylinder tion for the two basic scheduling algorithms: FCFS and SSF.

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· 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 Computational complexity theory is a branch of the theory of computation in theoretical computer science that focuses on classifying computational problems according to their inherent difficulty, and relating the resulting complexity classes to each other.

A computational problem is understood to be a task that is in principle amenable to being solved by mechanical application of mathematical. Below is an essay on "Scheduling Algorithms" from Anti Essays, your source for research papers, essays, and term paper examples.

Scheduling Algorithms CPU Scheduling deals with the problem of deciding which of the processes in the ready queue is to be allocated the

Research papers on cpu scheduling algorithms