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- Operating Systems - Interview Questions and Answers
- Operating System Interview Questions & Answers
Operating System Interview Questions
What is a process and process table? For example a Web Browser is a process, a shell or command prompt is a process. The operating system is responsible for managing all the processes that are running on a computer and allocated each process a certain amount of time to use the processor.
In addition, the operating system also allocates various other resources that processes will need such as computer memory or disks. To keep track of the state of all the processes, the operating system maintains a table known as the process table. Inside this table, every process is listed along with the resources the processes is using and the current state of the process. Processes can be in one of three states: running, ready, or waiting.
The running state means that the process has all the resources it need for execution and it has been given permission by the operating system to use the processor. Only one process can be in the running state at any given time. The remaining processes are either in a waiting state i. In a real operating system, the waiting and ready states are implemented as queues which hold the processes in these states.
What is a Thread? What are the differences between process and thread? A thread is a single sequence stream within in a process. Because threads have some of the properties of processes, they are sometimes called lightweight processes.
Threads are popular way to improve application through parallelism. For example, in a browser, multiple tabs can be different threads. MS word uses multiple threads, one thread to format the text, other thread to process inputs, etc. A thread has its own program counter PC , a register set, and a stack space. Threads are not independent of one other like processes as a result threads shares with other threads their code section, data section and OS resources like open files and signals.
What are the benefits of multithreaded programming? It makes the system more responsive and enables resource sharing. It leads to the use of multiprocess architecture. It is more economical and preferred. Priority Scheduling. Shortest Remaining Time. Round Robin RR Scheduling. Multiple-Level Queues Scheduling. What is deadlock? Deadlock is a situation when two or more processes wait for each other to finish and none of them ever finish.
Consider an example when two trains are coming toward each other on same track and there is only one track, none of the trains can move once they are in front of each other.
Similar situation occurs in operating systems when there are two or more processes hold some resources and wait for resources held by other s. What are the necessary conditions for deadlock?
Mutual Exclusion: There is a resource that cannot be shared. No Preemption: The operating system is not allowed to take a resource back from a process until process gives it back. What is Virtual Memory? How is it implemented? Virtual memory creates an illusion that each user has one or more contiguous address spaces, each beginning at address zero.
The sizes of such virtual address spaces is generally very high. The idea of virtual memory is to use disk space to extend the RAM. The illusion of such a large amount of memory is created by subdividing the virtual memory into smaller pieces, which can be loaded into physical memory whenever they are needed by a process. What is Thrashing? Thrashing is a situation when the performance of a computer degrades or collapses. Thrashing occurs when a system spends more time processing page faults than executing transactions.
While processing page faults is necessary to in order to appreciate the benefits of virtual memory, thrashing has a negative affect on the system. As the page fault rate increases, more transactions need processing from the paging device.
It occurs with First in First Out page replacement is used. See the wiki page for an example and more details. Differences between mutex and semphore? Last Minute Notes — Operating Systems. We will soon be covering more Operating System questions. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
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Operating System Interview Question
A list of top frequently asked Operating System interview questions and answers are given below. The operating system is a software program that facilitates computer hardware to communicate and operate with the computer software. It is the most important part of a computer system without it computer is just like a box. A socket is used to make connection between two applications. Endpoints of the connection are called socket. Real-time system is used in the case when rigid-time requirements have been placed on the operation of a processor.
An operating system OS is system software that bring about computer hardware and software properties and delivers common facilities for computer programs. Why our jobs site is easy for anyone to learn and to crack interview in the first attempt? These is because we the Wisdomjobs will provide you with the complete details about the interview question and answers and also, we will provide the different Operating System roles to apply easily, operating System is much in demand. There are various leading companies that offer jobs in various roles like Android with Operating Systems, Operating Systems Analyst and many other roles too. To clear any interview, one must work hard to clear it in first attempt. So simply to save your time we have provided all the necessary details about operating System Interview Questions and Answers and Operating System jobs at one place.
These 90 solved Oops questions will help you prepare for technical interviews and online selection tests conducted during campus placement for freshers and job interviews for professionals. After reading these tricky Operating Systems questions , you can easily attempt the objective type and multiple choice type questions on OS. What are the functions of operating system? The operating system controls and coordinates the use of hardware among the different processes and applications. It provides the various functionalities to the users. The following are the main job of operating system. Describe system calls and its type System calls works as a mediator between user program and service provided by operating system.
Kernel is the core and essential part of computer operating system that provides basic services for all parts of OS. Page 2. 20/08/15 pm. OS Interview.
Operating Systems - Interview Questions and Answers
Solved examples with detailed answer description, explanation are given and it would be easy to understand. View the solution for the problems with feel and good user interface; easily go through all questions and answers. You can easily answer the interview questions based on Operating Systems by practicing the exercises given below. Long term scheduler determines which programs are admitted to the system for processing. It controls the degree of multiprogramming.
Operating System OS Interview Questions and Answers will guide every kind of job seeker because computer is the basic need for any organization so every one must have so of the basic idea of computer and the Operating System is the soul of computer.
Operating System Interview Questions & Answers
An Operating system is an essential part in any computer system. There is a huge demand for OS developers in the IT industry. To build a career as an Operating System developer, candidates need to crack the interview in which they are asked for various Operating System interview questions. We have compiled a list of frequently asked OS interview questions and answers that an interviewer might ask you during your Operating System job interview or viva. Candidates are likely to be asked basic to advance level Operating System interview questions depending on their experience and various other factors. The below list covers all the important Operating System questions for freshers as well as experienced Operating System professionals. This common OS Developer interview questions guide will help you clear the interview and help you get your dream job.
What is a process and process table? For example a Web Browser is a process, a shell or command prompt is a process. The operating system is responsible for managing all the processes that are running on a computer and allocated each process a certain amount of time to use the processor. In addition, the operating system also allocates various other resources that processes will need such as computer memory or disks. To keep track of the state of all the processes, the operating system maintains a table known as the process table. Inside this table, every process is listed along with the resources the processes is using and the current state of the process.
Operating Systems Interview Questions. 1 aidshealing.orgumar, mail: Ans: An operating system is a program that acts as an intermediary between the user and the computer common variables, updating tables, writing a file and so on. Only one.
Operating System Interview Questions And Answers
Остальные - все, что внизу. Мы ищем различие, выражаемое простым числом. Через несколько секунд всем стало ясно, что эта затея бессмысленна. Числа были огромными, в ряде случаев не совпадали единицы измерения. - Это все равно что вычитать апельсины из яблок, - сказал Джабба.
Стратмору едва не удалось сделать предлагаемый стандарт шифрования величайшим достижением АНБ: если бы он был принят, у агентства появился бы ключ для взлома любого шифра в Америке. Люди, знающие толк в компьютерах, пришли в неистовство. Фонд электронных границ, воспользовавшись вспыхнувшим скандалом, поносил конгресс за проявленную наивность и назвал АНБ величайшей угрозой свободному миру со времен Гитлера. Новый стандарт шифрования приказал долго жить. Никому не показалось удивительным, что два дня спустя АНБ приняло Грега Хейла на работу. Стратмор решил, что лучше взять его к себе и заставить трудиться на благо АНБ, чем позволить противодействовать агентству извне.
Для Сьюзан это не составляло проблемы: она была безмерно счастлива в своей скромной двухкомнатной квартире, водила вольво и довольствовалась весьма консервативным гардеробом. Но вот туфли - совсем другое. Даже во время учебы в колледже она старалась покупать самую лучшую обувь. Нельзя дотянуться до звезд, если чувствуешь себя ущемленной, - сказала как-то ее тетушка. - И если уж попала туда, куда стремилась, постарайся выглядеть на все сто.
У тебя ужасный вид. Сьюзан подавила поднимающуюся волну страха. В нескольких метрах от нее ярко светился экран Хейла.
Черт возьми, - тихо выругался Стратмор, - мой новый пейджер, - и с отвращением посмотрел на коробочку, лежащую у него на ладони. Он забыл нажать кнопку, которая отключила звук. Этот прибор он купил в магазине электроники, оплатив покупку наличными, чтобы сохранить анонимность. Никто лучше его не знал, как тщательно следило агентство за своими сотрудниками, поэтому сообщения, приходящие на этот пейджер, как и отправляемые с него, Стратмор старательно оберегал от чужих глаз.