types of operating system ppt presentation

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What is Operating System and its Types | Uses - PowerPoint PPT Presentation

What is Operating System and its Types | Uses

The operating system (os) acts as a host for the application program that runs on the machine. as a host, one purpose of the operating system is to handle the operating details of the hardware. – powerpoint ppt presentation.

• Process Management
• Memory Management
• Disk And File System
• Graphical User Interfaces
• User Interface
• Job Management
• Task Management
• Windows Mobile
• Simple Batch System
• Multiprogramming Batch System
• Multiprocessor System
• Desktop System
• Distributed Operating System
• Clustered System
• Real time Operating System
• Handheld System

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Types of Operating Systems

Jul 29, 2014

290 likes | 922 Views

Types of Operating Systems. Computer Engineering Department Computer Graphics Course Asst. Prof. Dr. Ahmet Sayar Kocaeli University - Fall 201 2. Uniprocessor Operating Systems. An OS acts as a resource manager or an arbitrator Manages CPU, I/O devices, memory

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• large kernel
• transferring data
• distributed oss
• multiprocessor operating systems
• developing distributed systems

Presentation Transcript

Types of Operating Systems Computer Engineering Department Computer Graphics Course Asst. Prof. Dr. AhmetSayar Kocaeli University - Fall 2012

Uniprocessor Operating Systems • An OS acts as a resource manager or an arbitrator • Manages CPU, I/O devices, memory • OS provides a virtual interface that is easier to use than hardware • Structure of uniprocessor operating systems • Monolithic (e.g., MS-DOS, early UNIX) • One large kernel that handles everything • Layered design • Functionality is decomposed into N layers • Each layer uses services of layer N-1 and implements new service(s) for layer N+1

Uniprocessor Operating Systems • Microkernel architecture • Small kernel • user-level servers implement additional functionality

Distributed Operating System-Multi-computer- • Manages resources in a distributed system • Seamlessly and transparently to the user • Looks to the user like a centralized OS • But operates on multiple independent CPUs • Provides transparency • Location, migration, concurrency, replication,… • Presents users with a virtual uniprocessor

Multi-computer Systems • How to run multiprocessor software on multicomputer systems ?

Multiprocessor Operating Systems • Multi-core • Like a uniprocessor operating system • Manages multiple CPUs transparently to the user • Shared main memory and controlled by a single OS instance • Each processor has its own hardware cache • Maintain consistency of cached data

Multiprocessor Operating - Contd SystemsHardware Concept

Multiprocessor Operating Systems -Contd • A bus-based multiprocessor • A representation of shared memory super computing

Distributed Operating Systems (1) • Example: MOSIX cluster - single system image

Distributed Operating Systems (2) • Gives illusion of single system • Users not aware of multiplicity of machines • Access to remote resources similar to access to local resources • Data Migration – transfer data by transferring entire file, or transferring only those portions of the file necessary for the immediate task • Computation Migration – transfer the computation, rather than the data, across the system

Network Operating System (1)

Network Operating System (2) • Users are aware of multiplicity of machines. Access to resources of various machines is done explicitly by: • Remote logging into the appropriate remote machine (telnet, ssh) • Remote Desktop (Microsoft Windows) • Transferring data from remote machines to local machines, via the File Transfer Protocol (FTP) mechanism

Middleware-based Systems

Types of Distributed OSs

Comparison between Systems

Pitfalls when Developing Distributed Systems • False assumptions made by first time developer: • The network is reliable. • The network is secure. • The network is homogeneous. • Latency is zero. • Bandwidth is infinite. • Transport cost is zero. • There is one administrator.

Summary • Distributed Systems … autonomous computers • working together to give the appearance of a single, coherent system. • They are transparent, scalable and open. • Unfortunately, they also tend to be complex

Overview challenges • Concurrency • Shared access to resources must be possible • Openness • Interfaces should be publicly available to ease adding new components • Security • The system should only be used in the way intended

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