Process Scheduling in Longest Job First (LJF) Algorithm: a Proposed Framework for Starvation Problem

Description

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Abstract

Process as an individualistic program in execution forms the bases of everything in the computer system functionality, Central Processing Unit (CPU) becomes the main target of every process execution. The best ordering and sequence of assigning these processes to the CPU becomes the most difficult problem to obtain best performances.

This thesis work in the field of CPU scheduling by carefully studying all popular scheduling algorithms  thereby proposing  an  option to the most uncommon scheduling algorithm: Longest Job First (LJF), to compete along side others.

The major problem leading to starvation was reduced by proposing a model into the LJF. The model was designed and tested thereby suggesting ways by which LJF could be enhanced to solve parts of the starvation problems, waiting times and context switches.

Introduction

Process scheduling algorithms has been an interesting field of study in Operating Systems. Scheduling is a key concept in computer multitasking, multiprocessing and real-time operating system designs. Scheduling refers to the way processes are assigned to run on available Central Processing Unit (CPU) (Galvin, 2004).

Each Process (a program in execution)  passes through  some  stages  in their execution and allocation to CPU as will be illustrated in process-state diagram.

A Process is started at arrival time which gets into the Ready Queue based on some scheduling algorithm and waits for the Job scheduler/ dispatcher which decide on what scheduling algorithm to use.

The process state diagram of Fig 1.1 illustrates this. The process state is as follows: New: Where processes enters. Ready: It is a stage where queues are used to order the manner in which jobs arrived.

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