OPERATING SYSTEM STRUCTURE The operating system can be defined as a collection of written procedures, linked together into a single large executable binary program. The most useful and better approach is divide the task into small components /modules instead of having one monolithic system so that the operating system can function properly and can be modified easily. Input, output and functions should be clearly defined in each of the system modules as far as we can finally come with large and complex system. Simple structure, layered structure, microkernel, client-server systems and virtual machines are among different structures of operating system. 1 Simple Structure Well defined structures are very important in operating systems. Scope, functionality and well designed modules are main factor to consider to make sure the system will satisfy user needs and provides a good service to users.MS-DOS is a good example of Simple structure because of its history which starts with small, simple and limited system that did not consider about the number of users and possibility of become popular operating system that can be able to accommodate as many users as possible.MS-DOS do not consider the matter of separation between the interfaces and levels of functionality. As Silberschatz (2013)," stated that an application programs are able to access the basic I/O routines to write directly to the display and disk drives. Such freedom leaves MS-DOS vulnerable to errant (or malicious)
Operating Systems are complex pieces of software that are designed for powerful hardware, easily capable of running many programs at once, the prioritize hardware task requests known as ‘system calls’ and allocate them memory space or processing time as needed.
The Operating system is one most important parts of anything that runs on technology. It manages the computers memory and processes the information for the software and hardware. There is different operation system for pc, tablets, smart cars, and smartphones.
A computers operating system (OS) is the core of the computer and is more than just software. The OS controls the computer’s memory and processes as well as its hardware and software. It is the brain of the computer. Software applications on the other hand perform a certain task. Ex. Google Chrome provides internet and Adobe allows PDF files to be read (among other things). The OS is what makes all of these applications work successfully and accomplish whatever the application is designed to accomplish.
Identifying and describing key features of operating systems and common application software as they relate to the management of information.
Tiny OS is a tiny (fewer than 400 bytes), flexible operating system built from a set of reusable components that are assembled into an application-specific system [Szewczyk et al., 2005].
DOS is the basic system that people have to using Command line prompt to communicate with computer via simple interface which is not “friendly” user interface.
Task 1 – P2 Purpose of Operating Systems An Operating System (OS) is a software program that allows the computer hardware to be able to communicate and operate with the computer software. Without a computer Operating System, a computer and software programs would be useless. Initially the Operating System acts as an interface between the user of a computer and the computer’s hardware.
The operating system is the set of instructions that direct the computer to accomplish specific tasks such as document production and spreadsheet calculations.
The challenges for OS structures depend on the diversity of hardware like number of cores, memory hierarchy, IO configuration, instruction sets and interconnects.
As design moves forward, the development teams begin to generate a tremendous amount of detailed information about the system. Modules, classes, data fields, data structures, forms, reports, methods, subroutines, and tables are all being defined in substantial detail in the design model. The key design tasks are decomposing the application into layers, clients, and servers, distributing the “pieces” across hardware platforms, and defining the physical network and protocols.
An operating system is a vital component of the computer system. The common and simple devices like refrigerators and microwave ovens does not have an operating system. The complex systems which handle several components, functions and processes usually have an operating system. The operating system is like the brain of a human being, the brain is an essential organ in the body of human being which sends signals and helps functioning of the human body. Our intelligence, attitude, emotions and senses defines our presence, all these are possible because of our brain. In similar manner, “Operating System” (OS) is the power behind a computer system. In other words, operating system is brain of the computer and processor is the heart of the computer. A computer is the concatenation of several hardware parts. The operating system manages computer hardware resources and provides common services for computer programs and other application software.
The operating system is an extremely crucial type of system software. It is the backbone of a computer. Without an operating system, our computers will not function properly. Operating systems are highly skilled software that includes programs with an ample amount of information. This information provided from these programs makes it easier for applications to communicate with the hardware. Linux and Windows are two operating systems that dominate in our society today. They are not only dominating in our society, but also in the business world. Windows and Linux are the two most popular
However in saying that, if I today had to build a multi-million Rand computer company, I would have to agree that giving structure to your system and separating it into “mini-stones”(Knuth, 1968) would have to be the best and the safest way to do it. Would it be the fastest? Maybe not but with the amount of pure knowledge people are gaining over the years about hacking systems and stealing sensitive data I would never want all of my data in any one of my systems to be at risk all the time. That is why I believe using a microkernel, or even a hybrid kernel is the best way to structure a
Since developers are increasingly building distributed operating systems, the way to deal with complexity is using the concepts of containers. Containers are a native OS construct that provide light weight isolation. In Linux there is a concept that is comprised of different sub-concepts. There are namespaces that provide isolations for user database, processes and IP addresses. Think of a container as hosted on top of an Linux OS and it gets its own database, processes and IP addresses. It also gets cgroups which governs resources. They make sure that not one container is using all the resources but it shared all the way across. Each container gets a read write view such a Union File system. These three make up the idea of a container.
And all of this runs "on top of" an os, such as Windows or Linux system.