International Journal of Trend in Scientific Research and Development

Memory management is the process of controlling and coordinating computer memory, assigning portions called blocks to various running programs to optimize overall system performance and also known as memory allocation. Placement algorithms are implemented to determine the slot that can be allocated process amongst the available ones in the partitioned memory. Memory slots allocated to processes might be too big when using the existing placement algorithms hence losing a lot of space due to internal fragmentation. In dynamic partitioning, external fragmentation occurs when there is a sufficient amount of space in the memory to satisfy the memory request of a process but the process's memory request cannot be satisfied as the memory available is in a non contiguous manner. This paper describes how to resolve external fragmentation using three allocation algorithms. These algorithms are First fit, Best fit and Worst fit. We will present the implementation of three algorithms and compare their performance on generated virtual trace. 

In a multiprogramming system, multiple processes exist concurrently in main memory. Each process alternates between using a processor and waiting for some event to occur, such as the completion of an I O operation. The processor or processors are kept busy by executing one process while the others wait. The key to multiprogramming is scheduling. CPU scheduling deals with the problem of deciding which of the processes in the ready queue is to be allocated the CPU. By switching the CPU among processor the operating system can make the computer more productive. Scheduling affectes the performance of the system because it determines which processes will wait and which will progress. In this paper, simulation of various scheduling algorithm First Come First Served FCFS , Round Robin RR , Shortest Process Next SPN and Shortest Remaining Time SRT is done over C 

In the recent era of computing, applications an operating system cannot survive without efficient memory management, especially if an application has to be under Surve load for an undefined long time. Resources must be utilized efficiently to enhance performance. This paper describes about the memory management in an operating system and it will demonstrate basic architecture of segmentation in an operating system and basic of its allocation. This paper also describes about the basic concept of virtual memory management and dynamic memory management. 

By Durgesh Raghuvanshi" Memory Management in Operating System" 

Mobile phones have started a revolution in the lives of people in the over the past few years. The ability to store, access, communicate and compute content via mobile phones has redefined connectivity and communications because of this Mobile Application Developers of this generation want their apps to be available on all the platforms. 

To address this issue, cross platform tool have been developed and was found to solve device functionality features, platform and device coverage problems. Choosing one single Cross platform tool for development was difficult, it was suggested that, Titanium and Xamarin were picked as a preliminary starting point. But there is android application development software where developers can develop the android application using C# and .NET Framework in Xamarin Studio. Xamarin is a Cross platform mobile app development platform for building native apps on iOS, Android, and Windows apps from a common C#/.NET codebase. 

In this paper we are focusing on native application development approach and cross platform application development approach. Developing mobile applications inside Visual Studio provides a number of benefits such as:- Creating cross-platform projects for Android, Windows and iOS applications, Working with a familiar IDE, while taking many advantages of Xamarin. iOS bindings of all Apple's API Although developing applications using Xamarin saves time and resources, there are some inherent disadvantages. 

By Harish Nair | Vineet Yadav" Study on Cross '“Platform Mobile App Development With Xamarin" 

Rate-monotonic scheduling (RMS) is a priority assignment algorithm used in real-time operating systems (RTOS) Scheduling procedures are a backbone of any operating system. In previous paper I analyze and conclude that the rate monotonic scheduling is best for real time scheduling. 

Deterministic deadlines are exactly equal to periods As I know scheduling procedures are basically divided into two main streams: first is the uniprocessor and another one is multiprocessor. This paper describes the rate monotonic (SRM) system. 

Here I previously studied and analyzed different SRM and SDM procedures to conclude that which algorithm or which policy is best for real time scheduling. 

by Pallavi Ganeshpurkar "Research on Static Rate Monotonic Real Time Scheduling System" 

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-4 , June 2018, 

An Operating System or OS is the most important software and program that can run all types of Computer, Mobile phone, Hand Held Device, etc. It helps to connect and interface computer hardware to program and application software and other common essential services. The OS is initially loaded on at boot time. 

Like a host, the OS acts for running and handling of application programs and operation of the hardware on the machine. The working principle of OS is first to configure then check ability to perform and then allow the program to run. Its main purpose is to handle the activities based on computer hardware. 

The OS also provides management of input, output and storage devices. Mostly in a system, some different computer programs run at the same time and they need to access CPU, memory, and storage. In an operating system, the user can communicate with the Command Line Interface by typing some command, and the user receives the response back from the system. But Modern Time Operating system uses a graphical user interface or GUI for easy to use. 

Now user can communicate with a system using a mouse to click button, menus, and everything is displayed on the screen using Text, Graphics or image. It is like a bank manager-- it makes sure that the working of application software must not be interfered by any other activity. 

by Sumanta Kabiraj | Anjli Gupta | Prof. Subhashis Kumar Chandra "Operating System a Case Study" 

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-3 , April 2018, 

This paper describes current research in real time operating system and its scheduling procedures. The scheduling procedure is the backbone of any operating systems. In this paper we analyses the application of scheduling theory to dependable real time systems are reviewed with a brief summary and conclude that different types of scheduling procedures are used in real time operating system. 

Issues covered include static and dynamic algorithms, application of real time operating system, rate monotonic and deadline monotonic with examples. This paper describes about characteristics of real time operating system. 

by Durgesh Raghuvanshi "Study on Real-time Operating System and its Scheduling Procedures" 

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-2 , February 2018, 

Scheduling procedures are a backbone of any operating system. In this paper I analyze and conclude that the types of different scheduling procedures used in real time. 

As I know scheduling procedures are basically divided into two main streams: first is the uni-processor and another one is multiprocessor.

by Pallavi Ganeshpurkar "Investigative Study on Scheduling Procedures for Real Time Operating System" 

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-1 , December 2017, 

URL: http://www.ijtsrd.com/papers/ijtsrd7094.pdf

Direct Link - http://www.ijtsrd.com/computer-science/operating-system/7094/investigative-study-on-scheduling-procedures-for--real-time-operating-system/pallavi-ganeshpurkar

Operating System, UGC Approved Journal