Distributed System

School of Electronics and Technology
Department of ICT and Electronics

Name: Professor

Surname: Muzenda

Reg-Number: C097720Q

Course : CUIT 406 Distributed System

Lecturer: Mr. A. Gamundani

Assignment: 1

Due Date: 23 September 2013

QUESTION 1

a) Differentiate between loosely coupled systems and tightly coupled systems. [6]
Tightly coupled systems Loosely coupled systems
Multiprocessor systems contain multiple CPUs that are connected at the bus level. These CPUs may have accesses to a central shared memory or may participate in a memory hierarchy with both local and shared memory Multiprocessor systems are based on multiple standalone single or dual processor or commodity computers interconnected via a high speed communication system
Tend to be used more as parallel systems with a goal of working on a single problem Tend to be used more as distributed systems with an aim of working on many unrelated problem

The delay experienced, when a message is sent from one computer to another is short and the data rate is high, that is the number of bits per second that can be transferred is large. The inter-machine massage delay is large and the data rate is low.
Perform better and are physically smaller than loosely coupled Physically large and perform less compared to tightly coupled

For example, two CPU chips on the same printed