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C C M 4 3 2 0Network Systems and Services

Comparison between the Network Operating systemsLike Linux, Windows 2000 and

Distributed operating system Amoeba.

Group Members : Yedukondalu Madhumanchi (M00295179)Saroop kumar reddy Chidirala(M00333357)

Date of Submission : 25-Feb-2011

Campus : Hendon

School of Computing ScienceDr G E Mapp

Middlesex University

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List of Contents

S.NO Content Page Number

1. Abstract 4

2. Introduction 4

3.

Network Operating System 6

4.

Distributed Operating System

6

5.

LINUX 6

5.1 Shell 7

5.2 Kernel 75.3 Linux features and performance 9

5.4 Linux Advantages and disadvantages 9

5.5

Strengths and Weakness of Linux 10

5.6 Application of Linux 10

6 WINDOWS 2000 10

6.1

Windows 2000 Architecture 11

6.2

Kernel mode 11

6.3 User Mode 13

6.4

Windows 2000 features 13

6.5

Windows 2000 Benefits 14

6.6 Windows 2000 weakness 14

6.7

Windows 2000 security Features 14

7 Differences B/w Linux Vs Windows OS 15

8. Introduction to Amoeba 15

8.1 Design Goals 15

8.2 System Architecture 16

8.3 Fundamental Concepts 17

8.4 Outside Kernel 19

8.5 Weakness of Amoeba 20

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9 Conclusion 21

10 References 22

List of FiguresS.NO Contents Page Number

Figure 1 Operating System 5Figure 2 Conceptual Structure of the Linux Kernel 7

Figure 3 Windows 2000 architecture 11

Figure 4 I/O Manager Components 12

Figure5 Amoeba System Architecture 17

Figure6 Remote Procedure Call 18

Figure7 Bullet Server 19

Comparison between the Network Operating system

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Like Linux, Windows 2000 and

Distributed operating system Amoeba.

Abstract:

The Main aim of the paper is to clearly distinguish the Comparison between the

Linux, Windows Network operating System and Amoeba Distributed operating System.

This paper explains clearly about the network operating systems like Linux, windows

2000 and Amoeba, Amoeba can be described as an example of a distributed operating

system. Starting from the Linux operating system, this paper describes the Linux

operating system evolution, architecture. It also tells the list of Pros and Cons of the

Linux operating System and Features involved in that OS. Windows 2000 is one of thepowerful operating system in the world. However, This paper also concentrate on

Windows 2000 OS with explanation of the architecture, advantages, disadvantages and

security of the Windows 2000 .Finally, we discussed about Amoeba distributed

Operating System and what are the features of the Amoeba and Understanding the

architecture of the Amoeba Distributed Operating System.

Introduction:

An operating system(OS) is a program designed to run other programs on acomputer . Operating system runs automatically when the user power switches on and it

stops running on the computer when the power switch off. It is act as an interface

between user and the CPU. Operating system controls the external devices that are

connected to the computer and it can manage files on the computer. Operating system can

perform the things like taking the input from the external devices like keyboards, printers,

scanners and display the output on computer monitor. By this we can say that it is an inter

face between user and the CPU. Responsibility of Operating system is to make sure that

both programs and users do not interfere when both the running at the same time. This is

also responsible for not to access the system by unauthorized users.

http://www.wisegeek.com/what-is-an-operating-system.htmhttp://www.wisegeek.com/what-is-an-operating-system.htmhttp://www.wisegeek.com/what-is-a-computer.htmhttp://www.wisegeek.com/what-is-an-operating-system.htmhttp://www.wisegeek.com/what-is-an-operating-system.htmhttp://www.wisegeek.com/what-is-a-computer.htm

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Above figure shows the how the operating system connects to the external device and

how the devices are controlled by the Operating System .

These are classified depending on the number of users or tasks using the operating

systems.Multi-User:

It enables two or more users can run the programs at the same time.

Multitasking:

It enables doing one or more tasks at same time. It is very good method to utilise

the time effectively.

Multiprocessing :

It allows running the same program on different CPUs.

Multithreading:

It enables that the program in different locations to run at same time.

Real-time operating systems:

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This is for real time applications and in this Operating system. It will respond to

input and process the program at the same time.

Most popularly used Operating Systems are Windows 2000, Windows XP and

Linux. Operating systems can also be classified as network Operating System and

Distributed operating System

Network Operating System:

In this Operating System more number of activities controlled across a network.

Some of the network operating systems are UNIX, Linux and Microsoft windows 2000

server. It supports workstations (WS) and personal computer. Examples of network

operating systems are LAN and MAN

Distributed Operating System:

It is a collection of independent computers that appears to be a single system to

the users. One of the Examples of distributed operating system is amoeba.

LINUX:

It is an operating There are several Operating systems available these days. system (OS)

that controls your computer. Linux is the one of the most popular Network Operating

System used now days. Linux is basically from the UNIX. If we write any program for

UNIX it is also run on the Linux. Difference between UNIX and Linux is Linux comes

with GPL license and UNIX comes with BSD-Style license. Linux consisting of all the

features of UNIX and it is suitable for both high end servers and middle range servers.

Linux is an open source Operating system in the sense people can change, adopt and fix.

Linux provide not only the operating system but also some support, updates and provides

everything to users. Some peoples think that Linux is difficult because of the complicatedcommands and It is not user friendly. Those who knows the UNIX they can understand

the Linux than the beginners .beginners confused about the Linux due to complicated

commands.

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This is composed of process manager, virtual file system (VFS), memory

manager and abstract network services. Kernel is directly interacting with the

hardware.

Process Manager :

Process manager mange the process, how the process are scheduled. For

example if two processes are there it will manage those two processes by

implementing the priority technique. Parent child relationship is also

managed by the process manager.

Memory Manager:

It will manage the memory in the operating system. For example if one

process requires more memory than physical memory for execution or

programs then it implements the concept of virtual memory.Virtual File System:

Linux support more number of file systems. Virtual File System manages

the controlling of file access and directory.

Abstract network services:

Linux is also support some network requirements such as sockets and TCP/IP

networking.

Linux Operating system is a monolithic structure because of any module in the Linux

can exchange the information with the other modules. The main thing in the above fig1 is

mapping of kernel source code to the program module. Source code for the process

manager is Init/; this is a directory consist of initialization code for kernel. Source code

for Memory manager is Mm/ .It consists of memory manages codes. Virtual file system

composed of Fs/ source code .It contains all the file system codes and Drivers/ consists of

all device driver codes. Finally Abstract Network Services has a source code of Net/ .It

is a directory with Kernels networking codes.

Linux kernel does not have Modifiability capacity because if we modify anything in

the kernel that may affect the other parts of the kernel and we can say it is also not

suitable for re-usability because of file systems are integrated into the kernel.

Linux is different from the other Operating system in two main aspects those are:

firstly, Linux operating System can work on any other computer models for example

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Windows 95 and Windows 98 can run on only if the CPUs have the Intel architecture

but Linux can run on any other platforms. Second one is the Linux Operating System

software is free. If you want to use the Linux you can get the Linux for free but if u wants

Linux with some special application you have to pay something to obtain the software.

Linux applications are in open source form this enables users to modifies and improve

them.

Linux features and performance:

Linux has some attractive features like:

It is open source

It has multi processing capabilities

Very wide range of hard ware compatibility

High performance

Millions of installed base

It consist of IP Security and IPV6

Linux Advantages and disadvantages:

Linux has some of the good pros and cons those are

Linux Advantages:

Linux is free:

You do not have to pay anything for the Linux software.

Linux is portable:

If anyone bought a new PC without knowing which Operating System runs on

that computer? They can use the Linux because of the portability option.

Linux was made to keep running:

We can keep running the Linux day and night for completing the tasks .by this

we can save some time.

Secure and Versatile:

Linux is more secure like a firewall.

Scalable:

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come from Microsoft family but applications are different. Windows 2000 server does

everything what windows 2000 professional do. Windows 2000 server is designed for to

run the application on server .windows 2000 professional takes all the advantages from

the Windows NT and some extra features are also added to improve the operating system.

Windows 2000 Architecture:

Windows 2000 architecture is consisting of client/server, layered and objects

oriented principles. Architecture of windows 2000 was developed by layered approach.

In layered approach code in each layer can access only by the layer below to that. By this

approach we can improve the operating system because if we change any layer on

operating system it does not affect the other parts of the operating system. Windows 2000

architecture was developed by C language code. So, a window 2000 is portable. In this

Operating system debugged from staring layer to the end layer.

The above Architecture consists of two main modes those are: user and kernel modes.

Kernel mode:

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Kernel is the heart of the operating system. It is responsible for scheduling the

events .kernel mode composed of hardware abstraction layer (HAL), Micro kernel and

executive services.

Hardware Abstraction Layer (HAL):

It is in between hardware and kernel. HAL controls the all activities between

Kernel and the hard ware in operating system. HAL directly interact with the hard ware

for any manipulations. Windows 2000 has a capability of running multiprocessor on

computer by using HAL .It abstract the hard ware from kernel and no need to know what

type of hard ware used.

Microkernel:

It provides time slice between multiprocessor and handling of interrupt, threads.

When the system startup it takes information of which devices are loaded into system

from registry.

Executive services:

It contains the I/O manager, cache manager, Virtual memory manager, file

systems, object management and process or thread management. I/O manager controls

the I/O operations between user applications and hard disk. It is manage the all

information coming from any device to computer. I/O manager subdivide into some more

sections

Figure (4). Input/Output Manager Components in

It contains cache manager, file system, network drivers and device drivers. Cache

manager controls how the disk cache works. File system take care of all files in the

system .network drivers manages network protocols in the I/O manager and finally

device drivers controls all the devices like keyboard ,mouse and hard disk.

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Object manager in executive manages objects that are used by windows 2000 and

it can also extend to another object. Process manager manages all the activities done by

the processes. Security reference monitor watch if any unsecured thing comes into the

computer.

Windowing and graphics system:

It uses Graphic User Interface (GUI) to provide all the graphics to computer.

User Mode:

This mode consists of service, environment sub systems, system process and

applications.

System processes :

It contains logon process, session manager and service controller.

Services :

It support services like event logger, remote procedure call, alerter and replicator

Applications :

It provides user applications like MS-DOS, POSIX and WIN32.

The subsystems are again separated into another two parts in user mode .Those are

environmental subsystems and Integral sub system.

Environmental Sub systems:

This provides application program interface (API) to the services. POSIX, OS/2,

WIN32 are the environmental subsystems in windows 2000 Operating system. It can

support other types of applications to windows 2000 by using the client /server

architecture. In the environmental subsystems applications are clients and subsystems are

servers

Integral sub systems:Integral subsystem performs functions like creating windows and opening files by

calling the WIN32 applications. It has components like virtual memory manager,

processor manager, I/O system manager and cache manager.

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Windows 2000 features:

It is Multi processor supports.It supports more number of programs and it will be user friendly.

This is runs totally in protected mode.

It had full user level security

It supports NTFS, FAT & FAT32 file system.

Windows 2000 Benefits:

Compatible and Stable OS.It consumes low time to for troubleshooting.

Greater performance compared to the Windows 95 and More flexible of

operations.

Windows 2000 weakness:

Less security :

Windows 2000 operating system is affected by viruses and an attack on TheOperating system is possible.

Not every windows 95/98 programs will run.

If a program writes to run on only 95/98 this program cannot run on the windows

2000.

Windows 2000 is not an open source.

As compare Linux it is not open source.

Windows 2000 security Features:

Windows 2000 provides authentication, data integrity :

Authentications is provided by the using the authentication protocol Kerberos.

Secure communication:

It is provided by using the Secure Socket layer protocol.

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Differences between Linux Vs Windows 2000 Operating System .

Linux Operating system Windows 2000 operating systemMore reliable

.It is an open source Operating

System

Price of the software is free.

ease of use

Some companies now also do notoffer drivers.

Better secured

Less percentage of people know all

about Linux.

less reliable compared to Linux

It is closed source

Microsoft Windows software

license cost varies between 50 to

150 US dollars.

Much easier compared with Linux.It is Better Hardware support.

windows is not secure compared

with Linux. and Still Attacks

possible.

More people using the Windows

Amoeba:

From the years of 1990s the distributed operating system was came into vision by

the idea of S. Tanenbaum at the Vrije Universiteit by the Centre of Computer Science and

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Mathematics department in Amsterdam doing research for distributed operating system.

The aim of this distributed operating system is to connect many computers together. In

this, Amoeba operating system the work (or) task was distributed between the processor

pools. The user doesnt know where the execution of the files is going to do because the

system share this files in the network with other to gain high performance.

Design Goals:

The design goal of Amoeba based on four;

1. Distribution - connecting many machines together

2. Parallelism - multiple CPUs allows using for individual jobs

3. Transparency It will act like a single system

4. Performance - it is an efficient manner

It was a distributed system, multiple machines which are not same and connected

together. ameoba was connected in LAN. It uses a high performance FLIP network

protocol for LAN communication. If the machine is having more than one interface then

it automatically uses the FLIP network interface for communication.

Ameoba also supports for parallel system. By this, one job can be divided by the

other processors to gain high speed in performance.

It is transparency. The user doesnt know where the files are storing and the

location of CPUs. It will automatically replicates and handle the issues like file by the

users.

Last but not least, is Performance; it has some minimal delays in sending andreceiving the files between the machines to machine in high bandwidth.

System Architecture:

Amoeba operating system was designed based on the single microcomputer, of the

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recommended software for the minimum configuration.

1. Workstation(WS).

2. Processor pool(PP).

3. Servers.

4. Gateways.

A typical Amoeba operating system will consists of three main functional classes

of machine. First class, belongs to completely user interface and it doesnt do any other

computing. The workstation used for running is X windows system. The second class is

pool of processors; it can be the part of multiprocessors or multi computers and it have

megabytes of private memory and it is shared by processors. LAN communication is

done by the processor pool.

Figure 5.System Architecture

Third class is for specialized servers such as file and directory servers and it completely

dedicated to hardware.

All this three classes are connected to the fast LAN .

Fundamental Concepts:

(1)Microkernel and Server Architecture:

It is designed with microkernel architecture. In this very operation is goes

through the kernel even the I/O and memory management so everything is build on the

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basis of kernel to give the user space server processes. Some of the user processes runs

the application programs and such processes are called clients. Basic function of

microkernel is to communicate the client and servers with each other.

2.Threads:

In many operating systems, single thread of control is present but in amoeba

operating system each process handle as its own thread that means it contains multiple

threads. By using this multiple it makes easy in distributed and parallel computing

because each process is handle by each thread and all processes are passed through the

common block of cache uses synchronization. Kernel allows some threads to access the

memory management services.

1. Remote Procedure Call:

The basic mechanism used for communication is Remote Procedure Call,

because each process as to communicate with each other if they are in same shell or

block is easy, if they are in different places then RPC is used for communication and

special library procedures are called as stubs and these are used for RPC. Amoeba uses

a special language called AIL (Amoeba Interface Language) and this automatically

produces stub.

Figure (6) Remote Procedure Control

2. Group Communication:

By this function so many problems in distributed and parallel programming are

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solved due to many applications need to communicate with each other while sending

and receiving the data what they are exactly sending for them in same order.

3. Objects and Capabilities:

When an object is created, server will create a 128 bit value called capability. It

prevents in cryptographically from tampering.

4. Memory Management:

It is not having paging and swapping. If one process is executing and other are

in memory by this it gives high performance and other Disadvantage is uses larger

than physical memory.

5. I/O :

This function is also handled by kernel threads.

OUTSIDE THE KERNEL: Bullet File Server:

It is designed with high performance so it called as Bullet server. It stores

files continuously on the dicks and cache memory, the minimum requirement of

ram is 16MB if more RAM is there it gives more performance. If user requests

a file it sends the file in a single RPC.

Figure (7). Bullet Server Memory

Directory Server:

In comparison to the other operating system, amoeba operating system

doesnt handle all functions like other OSs. In this Bullet server just save the

files, its main function is to read, write and save the files to the disks but it

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doesnt rename the file name. It having a hierarchical file systems built easily

and general structures. By this function it gives high availability to the user and

avoids the replications.

Compilers:

Amoeba having some standard compilers likes ANSI, C, PASCAL, MODULA 2,

BASIC, FORTAN 77 and GNU C compiler.

Parallel Programming:

It uses a new language for parallel programming called as Orca, which allows users

to define their data types which based on Object-based distributed over a LAN. Orac uses

the Amoeba IPC facilities make them to share the software objects over the network in

efficient manner.

Utilities:

Amoeba offers utilities that work with UNIX for highly parallel configuration

manager.

Emulation of UNIX: To execute the UNIX programs in Amoeba it uses an Ajax offers

POSIX P1003.1 by this function simply compiles the program and link to Amoeba.

TCP/IP:

Although it uses a FLIP protocol for communication, by using a special

Server it connects to the TCP/IP through RPCs for internet accessing.

X Windows:

X Windows X11R6 is the special workstation for Amoeba RPC for Communication by using X Windows it can interface to the TCP/IP server.

Connection to UNIX:

By using a special driver SunOS 4.1.1 it allows the UNIX programs to

Communicate with amoeba programs.

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Weakness of Amoeba:

It is does not having any virtual memory.

No binary compatibles to UNIX.Amoeba is not a NFS support.

It doesnt have a enough memory.

It is not a well polished system.

Best for experimenting

Supplies a1000 pages of documentation

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Conclusion:

Finally we conclude that both Windows and Linux are the standard operating

systems. First version of the windows provides the graphical user interface (GUI).Windows 2000 is yet to be used as best server Operating system. Windows 2000 has

better permanence, Improved reliability, easy to install and improve system recovery .we

can create multiple user accounts in windows 2000 .Linux is fast developed operating

system. It is open source we can improve the code by modification. There is no

restriction on that but windows 2000 Operating system is not an open source. In some

aspects windows 2000 is better than Linux like Windows is a user friendly, no

Complicated commands and looks better in appearance. This is best used for Personal

computers, Home computers and small office network computer .On the other aspects

Linux operating system is best. Linux has better security compare to Windows 2000. In

big enterprises we can use Linux for networking .Linux is stable and has networking

ability. Both operating systems are widely used but depending on our applications we can

choose the Operating system.

Amoeba Operating System is having the transparency in work, reliable, it using

the Microkernel to increase the speed of the system by user interface. Ameoba alsosupports for some heterogonous systems. It is free to universities but they need an

internet connection to access but they charge $500 for the manual set of documents and it

also not a well polished system, it supports for both UNIX programs and X Windows for

TCP/IP connection.

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References:

Introduction to Linux, A hands on guide, Machtelt Garrels, Version 1.18 20050524

edtion.

http://www.wisegeek.com/what-is-an-operating-system.htm

http://guides.radified.com/magoo/guides/linux/linux_applications.html

http://www.informit.com/articles/article.aspx?p=21122&seqNum=3

http://linux.omnipotent.net/article.php?article_id=6960

http://www.webopedia.com/TERM/o/operating_system.html

http://media.wiley.com/product_data/excerpt/3X/07821285/078212853X.pdf

http://www.pcsupportadvisor.com/nasample/T1722.pdf

http://www.freebsd.org/marketing/os-comparison.html

http://cutenoc.blogsome.com/2007/03/10/p26/

http://www.cs.vu.nl/pub/amoeba/Intro

http://www.scs.stanford.edu/nyu/03sp/sched/amoeba.pdf

http://csserver.evansville.edu/~mr56/CS470/Final_Draft

http://www.cs.rice.edu/~qasem/papers/amoeba.pdf

The Amoeba Distribute Operating System,Andrew S.Tanenbaum and Gregory

J.Sharp, Vrije Universiteit, De Boelelaan 1081a, Amsterdam, The Netherlands, E-

mail: ast@cs.vu.nl , gregor@cs.vu.nl .

http://www.wisegeek.com/what-is-an-operating-system.htmhttp://guides.radified.com/magoo/guides/linux/linux_applications.htmlhttp://www.informit.com/articles/article.aspx?p=21122&seqNum=3http://linux.omnipotent.net/article.php?article_id=6960http://www.webopedia.com/TERM/o/operating_system.htmlhttp://media.wiley.com/product_data/excerpt/3X/07821285/078212853X.pdfhttp://www.pcsupportadvisor.com/nasample/T1722.pdfhttp://www.freebsd.org/marketing/os-comparison.htmlhttp://cutenoc.blogsome.com/2007/03/10/p26/http://www.scs.stanford.edu/nyu/03sp/sched/amoeba.pdfhttp://www.cs.rice.edu/~qasem/papers/amoeba.pdfmailto:ast@cs.vu.nlmailto:gregor@cs.vu.nlmailto:gregor@cs.vu.nlmailto:gregor@cs.vu.nlhttp://www.wisegeek.com/what-is-an-operating-system.htmhttp://guides.radified.com/magoo/guides/linux/linux_applications.htmlhttp://www.informit.com/articles/article.aspx?p=21122&seqNum=3http://linux.omnipotent.net/article.php?article_id=6960http://www.webopedia.com/TERM/o/operating_system.htmlhttp://media.wiley.com/product_data/excerpt/3X/07821285/078212853X.pdfhttp://www.pcsupportadvisor.com/nasample/T1722.pdfhttp://www.freebsd.org/marketing/os-comparison.htmlhttp://cutenoc.blogsome.com/2007/03/10/p26/http://www.scs.stanford.edu/nyu/03sp/sched/amoeba.pdfhttp://www.cs.rice.edu/~qasem/papers/amoeba.pdfmailto:ast@cs.vu.nlmailto:gregor@cs.vu.nl