Distributed System

Distributed system Parallel computation in tightly coupled Distributed system

Introduction in distributed system • • • • •

Definition of distributed system Advantage &disadvantages Classification of computer system Distributed system design issues Inter process communication in distributed system

•Definition of distributed system

• a processor can handle multiple process Multi processing:-

(it is a some way how to make the processor handle more than one process)

•Multi programming:-

(it is a multi processing but Multi processing is not Multi programming)

•

It is a collection of independent computer that appear to the user as a single computer

Example Example:-cluster of w.s connected via LAN •

Distributed system may have a single file system or sharing resources

•

Example of D.S :1. Email

2.communication between the user

• Definition (is the opposite to centralized system’it comprises computer installed a different sites each of them performing independent data processing.usuallly each computer of the D.s specialized to perform a range of activities or support a certain work station)

Advantages & disadvantages 1. Quick response 2. Better

performance 3. Reliability 4. Easy to expand 5. Sharing data

1. 2. 3.

Complexity Security Network problem such as (traffic b.w &Lost message)

Classification of computer system

SISD

LOSSELY COUPLED

SIMD

MIMD

TIGHTLY COUPLED

MISD

EXAMPLE FOR D.S