Distributed system

Distributed system

· A distributed system is a collection of processor located in geographical dispersal physical location.

· In this system, the workhold is distributed or divided between two or more computers that are linked together by communication network . that is the different processors communicate using communication links, such as telephone lines and buses3

· The various processors do not share memory, clock ,or peripheral devices instead each processors has its local memory.

· The purpose of distributed system is to provide an efficient and convenient environment for sharing of resources.

· Some example of distributed operating system are amoeba, angle, chorus, much, alpha kernel.

· The processors in a distributed system vary in size and function. They may include small microprocessors, workstations microcomputers, mainframe computers and large general purpose computers.

Model of distributed operating system

The design of distributed operating system is based on two models:

1. Client-server model

2. Peer-to-peer model

1. Client-server model. In client server model, the client send a resource request to the server and the server in turn provides the requested resources as the response back to client.

2. Peer-to-peer model. In peer-to-peer model, all the computers behave as clients. These clients communication with each other for exchange of their resources.

Pros and cons of Distributed system

Pros of Distributed system

1. Resource sharing: if number of different sites is connected to one another, then a user at one site may be able to use the resource available at another site.

2. Computation speedup. A distributed system allows us to divide a computational work into sub-computations and distribute it among the various site.

3 . Load sharing. In distributed system, if a particular site is overloaded with some jobs can be moved from one site to another.

4. Reliability : if one site fails in a distributed system, the remaining sites can continue operating. Giving the system better reliability.

5 . Communication. When several sites are connected to one another by a communication network, the users at different sites can exchange information.

Cons of Distributed system

1. It is difficult to provide adequate security in distributed systems because the nodes as well as the connections need to be secured.
2. Some messages and data can be lost in the network while moving from one node to another.
3. The database connected to the distributed systems is quite complicated and difficult to handle as compared to a single user system.
4. Overloading may occur in the network if all the nodes of the distributed system try to send data at once.

Comments

Classification of Operating System

Classification of operating systems The operating systems may be classified into different types depending upon the nature of interaction between the user and his/her program. The various types of operating system are : 1. single user operating system 2. Multi user operating system 3. Batch processing operating system 4. Multi programming operating system 5. Multi tasking operating system 6. Multiprocessing operating system 7. Time sharing operating system 8. Real time system Distributed system Multi threading operating system Single user operating system · ...

Micro kernel architecture

Micro kernel architecture What is Kernel? A kernel is an important part of an OS that manages system resources. It also acts as a bridge between the software and hardware of the computer. It is one of the first program which is loaded on start-up after the bootloader. The Kernel is also responsible for offering secure access to the machine's hardware for various programs. It also decides when and how long a certain application uses specific hardware. What is Microkernel? Microkernel is a software or code which contains the required minimum amount of functions, data, and features to implement an operating system. It provides a minimal number of mechanisms, which is good enough to run the most basic functions of an operating system. It allows other parts of the operating system to be implemented as it does not impose a lot of policies. Microkernels and their user environments are usually implemented in the C++ or C programming languages with a little bit of assembly. Ho...

Multi Programming Operating System

Multi programming system · Multi programming operating system allows multiple users to execute multiple programs using a single CPU concurrently i.e. at the same time. · In multiprogramming several process are kept in the main memory and CPU execute all these processes concurrently. It means, the CPU immediately switches from one process to next that are ready to get executed · In such an operating system when one process start process start performing the instructions from several programs at the same time. · Rather, it means that there are number program available to CPU and that portion of one is executed, then segment of another and so on ...

Easytolearn E-book 2

Description:here we give you pdf. about classification of operating system in which we provide all information of classification in detail.

ENTERPROCESS COMMUNICATION AND SYNCHRONIZATION

ENTERPROCESS COMMUNICATION AND SYNCHRONIZATION · In multi programming environment multiple process co-exit . a single program may be broken into number of processes. · The process are classified into two categories : independent processes and cooperating processes. · An independent process is a standalone process that does not share any data with any other process. It cannot affect or be affected by the other processes executing in the system. In other words, the modification made to an independent process does not affect the functioning of other process. · A cooperating processes is a process that shares data with other processes in a system it can affect or be affectedly the other processes executing in the system · ...

Easytolearn

Search This Blog