OPERATING SYSTEM - FILE SYSTEM http://www.tutorialspoint.com/operating_system/os_file_system.htm Copyright © tutorialspoint.com File A file is a named collection of related information that is recorded on secondary storage such as magnetic disks‚ magnetic tapes and optical disks.In general‚ a file is a sequence of bits‚ bytes‚ lines or records whose meaning is defined by the files creator and user. File Structure File structure is a structure‚ which is according to a required format
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FreeBSD vs. Linux vs. Windows 2000 FreeBSD Linux Windows 2000 Reliability FreeBSD is extremely robust. There are numerous testimonials of active servers with uptimes measured in years. The new Soft Updates1 file system optimizes disk I/O for high performance‚ yet still ensures reliability for transaction based applications‚ such as databases. Linux is well known for its reliability. Servers often stay up for years. However‚ disk I/O is non-synchronous by default‚ which is less reliable for
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its lifetime. Operating system takes care of selecting the processes from these queues in some fashion. Selecting process is done by the the appropriate scheduler. Types of scheduling: Short - term (or) CPU Scheduler Medium – term Long – term (or) Job Scheduler Short – Term Scheduler: Short term scheduler selects the processes that are ready to execute and allocates CPU to one of them. Medium – Term Scheduler: Medium term scheduler is introduced by some operating systems such as time sharing
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compute how long it will take to satisfy the following requests: 4‚ 40‚ 11‚ 35‚ 7‚ and 14 Using the LOOK policy All request are present in the wait queue Ignore rotational time and transfer time; just consider seek time 1. How does the result compare with Fig. 7.16? START FINISH TRAVELED 5 10 15 20 25 30 35 40 15 14 1 X
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1. Briefly‚ what is an operating system? An operating system serves as a hardware/software interface‚ acts as a repository for common‚ shared routines and defines a platform for constructing and executing application software. 2. An operating system presents an application programmer with a relatively "friendly" hardware/software interface. What does this mean? Why is it important? The user interface‚ sometimes called the shell‚ provides a mechanism for the user and application programs to communicate
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error or by a specific request from a user program that an OS service be performed .Dual-mode Operation allows OS to protect itself and other system components whereas Multimode Operation increasingly CPUs support multi-mode operations. System call provides the means for a user program to ask OS to perform OS tasks on the user program’s behalf. When a system callis executed‚ it is treated by H/W as a S/W interrupt. Timer protects CPU resource from getting stuck by a user program. To ensure OS maintains
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overview of Unix operating system. It starts by presenting a brief history of the early development of Unix. It concentrates on main aspects of Unix operating system. Key concepts covered are interactive multi-user operating systems‚ the design objectives of Unix‚ file-store organization‚ text processing and programming‚ the role of C programming language with regard to portability and reliable system software‚ process control (signals and fork)‚ error logging and recovery from system failures‚ modifiability
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Chapter no | Topic | 1 | Introduction‚ Types ‚ Computer System Overview | 2 | Operating System Structure‚ Components and Functions‚ Virtual Machine | 3 | Process Concept‚ Operation‚ Process scheduling‚ symmetric multi -processing‚ Cooperating Processes | 4 | Thread Concept‚ Thread Vs Process‚ IPC ‚kernel ‚microkernel | 5 | Scheduling‚ Types‚ Scheduling in batch‚ interactive and real-time systems (SJN‚ SJF‚ FIFO‚ LJN‚ round-robin‚ priority scheduling‚ and hybrid schemes). | 6 | Deadlock:
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TYPES OF OPERATING SYSTEM Real-time Operating System: It is a multitasking operating system that aims at executing real-time applications. Real-time operating systems often use specialized scheduling algorithms so that they can achieve a deterministic nature of behavior. The main object of real-time operating systems is their quick and predictable response to events. They either have an event-driven or a time-sharing design. An event-driven system switches between tasks based of their priorities
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ICT 100: Introduction to Information and Communications Technology Unit 3: Operating Systems Objectives: Define the term software Differentiate between system software and application software Define the terms operating system and utility program Identify the types of operating systems Explain the boot process of a computer Describe the functions of an operating system Identify common utility programs Software‚ also called a program‚ consists of a series of related instructions
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